Changes from Review of last PR adding Tiva PWM driver
This commit is contained in:
Gregory Nutt
parent
ce0dfda923
commit
f5ae207516
@ -1,49 +1,52 @@
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/************************************************************************************
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* arch/arm/src/tiva/tiva_pwm.c
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*
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* Copyright (C) 2016 Young Mu. All rights reserved.
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* Author: Young Mu <young.mu@aliyun.com>
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*
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* The basic structure of this driver derives in spirit (if nothing more) from the
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* NuttX SAM PWM driver which has:
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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||||
* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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* arch/arm/src/tiva/tiva_pwm.c
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*
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* Copyright (C) 2016 Young Mu. All rights reserved.
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* Author: Young Mu <young.mu@aliyun.com>
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*
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* The basic structure of this driver derives in spirit (if nothing more) from the
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* NuttX SAM PWM driver which has:
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
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||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
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||||
* 2. Redistributions in binary form must reproduce the above copyright
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||||
* notice, this list of conditions and the following disclaimer in
|
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/drivers/pwm.h>
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@ -59,60 +62,39 @@
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#include "chip/tm4c_memorymap.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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#define pwmerr(fmt, args...) printf("%s(%d): " fmt, __FUNCTION__, __LINE__, ##args);
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#ifndef CONFIG_DEBUG
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# undef CONFIG_DEBUG_PWM
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#endif
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#ifdef CONFIG_DEBUG_PWM
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# define pwmdbg dbg
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# ifdef CONFIG_DEBUG_VERBOSE
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# define pwmvdbg vdbg
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# else
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# define pwmvdbg(x...)
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# endif
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#else
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# define pwmdbg(x...)
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# define pwmvdbg(x...)
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#endif
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/************************************************************************************
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* Private Types
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************************************************************************************/
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* Private Types
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************************************************************************************/
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uint32_t g_pwm_pinset[] =
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{
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GPIO_M0_PWM0,
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GPIO_M0_PWM1,
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GPIO_M0_PWM2,
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GPIO_M0_PWM3,
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GPIO_M0_PWM4,
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GPIO_M0_PWM5,
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GPIO_M0_PWM6,
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GPIO_M0_PWM7,
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GPIO_M0_PWM0,
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GPIO_M0_PWM1,
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GPIO_M0_PWM2,
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GPIO_M0_PWM3,
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GPIO_M0_PWM4,
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GPIO_M0_PWM5,
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GPIO_M0_PWM6,
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GPIO_M0_PWM7,
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};
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struct tiva_pwm_chan_s
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{
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const struct pwm_ops_s *ops;
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uint8_t controller_id;
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uintptr_t controller_base;
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uint8_t generator_id;
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uintptr_t generator_base;
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uint8_t channel_id;
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const struct pwm_ops_s *ops;
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uint8_t controller_id;
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uintptr_t controller_base;
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uint8_t generator_id;
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uintptr_t generator_base;
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uint8_t channel_id;
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};
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/************************************************************************************
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* Private Function Prototypes
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************************************************************************************/
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* Private Function Prototypes
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************************************************************************************/
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static inline void tiva_pwm_putreg(struct tiva_pwm_chan_s *chan, unsigned int offset, uint32_t regval);
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static inline uint32_t tiva_pwm_getreg(struct tiva_pwm_chan_s *chan, unsigned int offset);
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static inline void tiva_pwm_putreg(struct tiva_pwm_chan_s *chan,
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unsigned int offset, uint32_t regval);
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static inline uint32_t tiva_pwm_getreg(struct tiva_pwm_chan_s *chan,
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unsigned int offset);
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static int tiva_pwm_setup(FAR struct pwm_lowerhalf_s *dev);
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static int tiva_pwm_shutdown(FAR struct pwm_lowerhalf_s *dev);
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@ -123,236 +105,246 @@ static int tiva_pwm_ioctl(FAR struct pwm_lowerhalf_s *dev,
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int cmd, unsigned long arg);
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/************************************************************************************
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* Private Data
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************************************************************************************/
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* Private Data
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************************************************************************************/
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uint32_t g_pwm_freq = 15000000;
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uint32_t g_pwm_counter = (1 << 16);
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static uint32_t g_pwm_freq = 15000000;
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static uint32_t g_pwm_counter = (1 << 16);
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static const struct pwm_ops_s g_pwm_ops =
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{
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.setup = tiva_pwm_setup,
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.shutdown = tiva_pwm_shutdown,
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.start = tiva_pwm_start,
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.stop = tiva_pwm_stop,
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.ioctl = tiva_pwm_ioctl,
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.setup = tiva_pwm_setup,
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.shutdown = tiva_pwm_shutdown,
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.start = tiva_pwm_start,
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.stop = tiva_pwm_stop,
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.ioctl = tiva_pwm_ioctl,
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};
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#ifdef CONFIG_TIVA_PWM0_CHAN0
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static struct tiva_pwm_chan_s g_pwm_chan0 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 0,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 0,
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.channel_id = 0,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 0,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 0,
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.channel_id = 0,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN1
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static struct tiva_pwm_chan_s g_pwm_chan1 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 0,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 0,
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.channel_id = 1,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 0,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 0,
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.channel_id = 1,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN2
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static struct tiva_pwm_chan_s g_pwm_chan2 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 1,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 1,
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.channel_id = 2,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 1,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 1,
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.channel_id = 2,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN3
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static struct tiva_pwm_chan_s g_pwm_chan3 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 1,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 1,
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.channel_id = 3,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 1,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 1,
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.channel_id = 3,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN4
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static struct tiva_pwm_chan_s g_pwm_chan4 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 2,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 2,
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.channel_id = 4,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 2,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 2,
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.channel_id = 4,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN5
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static struct tiva_pwm_chan_s g_pwm_chan5 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 2,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 2,
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.channel_id = 5,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 2,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 2,
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.channel_id = 5,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN6
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static struct tiva_pwm_chan_s g_pwm_chan6 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 3,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 3,
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.channel_id = 6,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 3,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 3,
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.channel_id = 6,
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};
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#endif
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#ifdef CONFIG_TIVA_PWM0_CHAN7
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static struct tiva_pwm_chan_s g_pwm_chan7 =
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{
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 3,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 3,
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.channel_id = 7,
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.ops = &g_pwm_ops,
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.controller_id = 0,
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.controller_base = TIVA_PWM0_BASE,
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.generator_id = 3,
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.generator_base = TIVA_PWM0_BASE + TIVA_PWMn_BASE + TIVA_PWMn_INTERVAL * 3,
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.channel_id = 7,
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};
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Name: tiva_pwm_getreg
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*
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* Description:
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* Get a 32-bit register value by offset
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*
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************************************************************************************/
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* Name: tiva_pwm_getreg
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*
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* Description:
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* Get a 32-bit register value by offset
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*
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************************************************************************************/
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static inline uint32_t tiva_pwm_getreg(struct tiva_pwm_chan_s *chan, unsigned int offset)
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static inline uint32_t tiva_pwm_getreg(struct tiva_pwm_chan_s *chan,
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unsigned int offset)
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{
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uintptr_t regaddr = chan->generator_base + offset;
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return getreg32(regaddr);
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}
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/************************************************************************************
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* Name: tiva_pwm_putreg
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*
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* Description:
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* Put a 32-bit register value by offset
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*
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************************************************************************************/
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* Name: tiva_pwm_putreg
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*
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* Description:
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* Put a 32-bit register value by offset
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*
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************************************************************************************/
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static inline void tiva_pwm_putreg(struct tiva_pwm_chan_s *chan, unsigned int offset, uint32_t regval)
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static inline void tiva_pwm_putreg(struct tiva_pwm_chan_s *chan,
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unsigned int offset, uint32_t regval)
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{
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uintptr_t regaddr = chan->generator_base + offset;
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putreg32(regval, regaddr);
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}
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/****************************************************************************
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* Name: pwm_setup
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*
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* Description:
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* This method is called when the driver is opened. The lower half driver
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* will be configured and initialized the device so that it is ready for
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* use. It will not, however, output pulses until the start method is
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* called.
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*
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* Input parameters:
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* dev - A reference to the lower half PWM driver state structure
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure
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*
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****************************************************************************/
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* Name: pwm_setup
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*
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* Description:
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* This method is called when the driver is opened. The lower half driver
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* will be configured and initialized the device so that it is ready for
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* use. It will not, however, output pulses until the start method is
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* called.
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*
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* Input parameters:
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* dev - A reference to the lower half PWM driver state structure
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure
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*
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****************************************************************************/
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static int tiva_pwm_setup(FAR struct pwm_lowerhalf_s *dev)
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{
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FAR struct tiva_pwm_chan_s *chan = (FAR struct tiva_pwm_chan_s *)dev;
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pwmdbg("setup PWM for channel %d\n", chan->channel_id);
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pwminfo("setup PWM for channel %d\n", chan->channel_id);
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/* Enable GPIO port, GPIO pin type and GPIO alternate function (refer to
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* TM4C1294NC 23.4.2-4)
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*/
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/* Enable GPIO port, GPIO pin type and GPIO alternate function (refer to TM4C1294NC 23.4.2-4) */
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int ret = tiva_configgpio(g_pwm_pinset[chan->channel_id]);
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if (ret < 0)
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{
|
||||
pwmerr("tiva_configgpio failed (%x)\n", g_pwm_pinset[chan->channel_id]);
|
||||
return -1;
|
||||
pwmerr("ERROR: tiva_configgpio failed (%x)\n",
|
||||
g_pwm_pinset[chan->channel_id]);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pwm_shutdown
|
||||
*
|
||||
* Description:
|
||||
* This method is called when the driver is closed. The lower half driver
|
||||
* stop pulsed output, free any resources, disable the timer hardware, and
|
||||
* put the system into the lowest possible power usage state
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
* Name: pwm_shutdown
|
||||
*
|
||||
* Description:
|
||||
* This method is called when the driver is closed. The lower half driver
|
||||
* stop pulsed output, free any resources, disable the timer hardware, and
|
||||
* put the system into the lowest possible power usage state
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int tiva_pwm_shutdown(FAR struct pwm_lowerhalf_s *dev)
|
||||
{
|
||||
FAR struct tiva_pwm_chan_s *chan = (FAR struct tiva_pwm_chan_s *)dev;
|
||||
pwmdbg("shutdown PWM for channel %d\n", chan->channel_id);
|
||||
pwminfo("shutdown PWM for channel %d\n", chan->channel_id);
|
||||
|
||||
/* Remove unused-variable warning */
|
||||
|
||||
(void)chan;
|
||||
|
||||
/* Ensure the PWM channel has been stopped */
|
||||
|
||||
tiva_pwm_stop(dev);
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pwm_start
|
||||
*
|
||||
* Description:
|
||||
* (Re-)initialize the timer resources and start the pulsed output
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
* info - A reference to the characteristics of the pulsed output
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
* Name: pwm_start
|
||||
*
|
||||
* Description:
|
||||
* (Re-)initialize the timer resources and start the pulsed output
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
* info - A reference to the characteristics of the pulsed output
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int tiva_pwm_start(FAR struct pwm_lowerhalf_s *dev, FAR const struct pwm_info_s *info)
|
||||
static int tiva_pwm_start(FAR struct pwm_lowerhalf_s *dev,
|
||||
FAR const struct pwm_info_s *info)
|
||||
{
|
||||
FAR struct tiva_pwm_chan_s *chan = (FAR struct tiva_pwm_chan_s *)dev;
|
||||
pwmdbg("start PWM for channel %d\n", chan->channel_id);
|
||||
pwminfo("start PWM for channel %d\n", chan->channel_id);
|
||||
|
||||
uint16_t duty = info->duty;
|
||||
uint32_t frequency = info->frequency;
|
||||
|
||||
/* Configure PWM countdown mode (refer to TM4C1294NC 23.4.6) */
|
||||
|
||||
tiva_pwm_putreg(chan, TIVA_PWMn_CTL_OFFSET, 0);
|
||||
if (chan->channel_id % 2 == 0)
|
||||
{
|
||||
@ -366,20 +358,27 @@ static int tiva_pwm_start(FAR struct pwm_lowerhalf_s *dev, FAR const struct pwm_
|
||||
}
|
||||
|
||||
/* Set the PWM period (refer to TM4C1294NC 23.4.7) */
|
||||
|
||||
uint32_t pwm_min_freq = (uint32_t)(g_pwm_freq / g_pwm_counter) + 1;
|
||||
uint32_t pwm_max_freq = g_pwm_freq;
|
||||
uint32_t load = (uint32_t)(g_pwm_freq / frequency);
|
||||
pwmdbg("channel %d: load = %u (%08x)\n", chan->channel_id, load, load);
|
||||
|
||||
pwminfo("channel %d: load = %u (%08x)\n", chan->channel_id, load, load);
|
||||
|
||||
if (load >= g_pwm_counter || load < 1)
|
||||
{
|
||||
pwmerr("frequency should be in [%d, %d] Hz\n", pwm_min_freq, pwm_max_freq);
|
||||
return -1;
|
||||
pwmerr("ERROR: frequency should be in [%d, %d] Hz\n",
|
||||
pwm_min_freq, pwm_max_freq);
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
tiva_pwm_putreg(chan, TIVA_PWMn_LOAD_OFFSET, load - 1);
|
||||
|
||||
/* Configure PWM duty (refer to TM4C1294NC 23.4.8-9) */
|
||||
|
||||
uint32_t comp = (uint32_t)((1 - (float)duty / g_pwm_counter) * load);
|
||||
pwmdbg("channel %d: comp = %u (%08x)\n", chan->channel_id, comp, comp);
|
||||
pwminfo("channel %d: comp = %u (%08x)\n", chan->channel_id, comp, comp);
|
||||
|
||||
if (chan->channel_id % 2 == 0)
|
||||
{
|
||||
tiva_pwm_putreg(chan, TIVA_PWMn_CMPA_OFFSET, comp - 1);
|
||||
@ -390,39 +389,41 @@ static int tiva_pwm_start(FAR struct pwm_lowerhalf_s *dev, FAR const struct pwm_
|
||||
}
|
||||
|
||||
/* Enable the PWM generator (refer to TM4C1294NC 23.4.10) */
|
||||
|
||||
tiva_pwm_putreg(chan, TIVA_PWMn_CTL_OFFSET, CTL_ENABLE << TIVA_PWMn_CTL_ENABLE);
|
||||
|
||||
/* Enable PWM channel (refer to TM4C1294NC 23.4.11) */
|
||||
putreg32((1 << chan->channel_id), chan->controller_base + TIVA_PWM_ENABLE_OFFSET);
|
||||
|
||||
putreg32((1 << chan->channel_id), chan->controller_base + TIVA_PWM_ENABLE_OFFSET);
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pwm_stop
|
||||
*
|
||||
* Description:
|
||||
* Stop the pulsed output and reset the timer resources
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
* Assumptions:
|
||||
* This function is called to stop the pulsed output at anytime. This
|
||||
* method is also called from the timer interrupt handler when a repetition
|
||||
* count expires... automatically stopping the timer.
|
||||
*
|
||||
****************************************************************************/
|
||||
* Name: pwm_stop
|
||||
*
|
||||
* Description:
|
||||
* Stop the pulsed output and reset the timer resources
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
* Assumptions:
|
||||
* This function is called to stop the pulsed output at anytime. This
|
||||
* method is also called from the timer interrupt handler when a repetition
|
||||
* count expires... automatically stopping the timer.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int tiva_pwm_stop(FAR struct pwm_lowerhalf_s *dev)
|
||||
{
|
||||
FAR struct tiva_pwm_chan_s *chan = (FAR struct tiva_pwm_chan_s *)dev;
|
||||
pwmdbg("stop PWM for channel %d\n", chan->channel_id);
|
||||
pwminfo("stop PWM for channel %d\n", chan->channel_id);
|
||||
|
||||
/* Disable PWM channel */
|
||||
|
||||
uint32_t value = getreg32(chan->controller_base + TIVA_PWM_ENABLE_OFFSET);
|
||||
value &= ~(1 << chan->channel_id);
|
||||
putreg32(value, chan->controller_base + TIVA_PWM_ENABLE_OFFSET);
|
||||
@ -431,52 +432,54 @@ static int tiva_pwm_stop(FAR struct pwm_lowerhalf_s *dev)
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pwm_ioctl
|
||||
*
|
||||
* Description:
|
||||
* Lower-half logic may support platform-specific ioctl commands
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
* cmd - The ioctl command
|
||||
* arg - The argument accompanying the ioctl command
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
* Name: pwm_ioctl
|
||||
*
|
||||
* Description:
|
||||
* Lower-half logic may support platform-specific ioctl commands
|
||||
*
|
||||
* Input parameters:
|
||||
* dev - A reference to the lower half PWM driver state structure
|
||||
* cmd - The ioctl command
|
||||
* arg - The argument accompanying the ioctl command
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on success; a negated errno value on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int tiva_pwm_ioctl(FAR struct pwm_lowerhalf_s *dev, int cmd, unsigned long arg)
|
||||
static int tiva_pwm_ioctl(FAR struct pwm_lowerhalf_s *dev, int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
FAR struct tiva_pwm_chan_s *chan = (FAR struct tiva_pwm_chan_s *)dev;
|
||||
pwmdbg("ioctl PWM for channel %d\n", chan->channel_id);
|
||||
pwminfo("ioctl PWM for channel %d\n", chan->channel_id);
|
||||
|
||||
/* Remove unused-variable warning */
|
||||
|
||||
(void)chan;
|
||||
|
||||
/* There are no platform-specific ioctl commands */
|
||||
|
||||
return -1;
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: tiva_pwm_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize one PWM channel for use with the upper_level PWM driver.
|
||||
*
|
||||
* Input Parameters:
|
||||
* channel - A number identifying the PWM channel use.
|
||||
*
|
||||
* Returned Value:
|
||||
* On success, a pointer to the SAMA5 lower half PWM driver is returned.
|
||||
* NULL is returned on any failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
* Name: tiva_pwm_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize one PWM channel for use with the upper_level PWM driver.
|
||||
*
|
||||
* Input Parameters:
|
||||
* channel - A number identifying the PWM channel use.
|
||||
*
|
||||
* Returned Value:
|
||||
* On success, a pointer to the SAMA5 lower half PWM driver is returned.
|
||||
* NULL is returned on any failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct pwm_lowerhalf_s *tiva_pwm_initialize(int channel)
|
||||
{
|
||||
@ -538,39 +541,28 @@ FAR struct pwm_lowerhalf_s *tiva_pwm_initialize(int channel)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
pwmvdbg("channel %d: channel_id=%d, ", channel, chan->channel_id);
|
||||
pwmvdbg("controller_id=%d, controller_base=%08x, ", chan->controller_id, chan->controller_base);
|
||||
pwmvdbg("generator_id=%d, generator_base=%08x\n", chan->generator_id, chan->generator_base);
|
||||
pwminfo("channel %d: channel_id=%d, ", channel, chan->channel_id);
|
||||
pwminfo("controller_id=%d, controller_base=%08x, ",
|
||||
chan->controller_id, chan->controller_base);
|
||||
pwminfo("generator_id=%d, generator_base=%08x\n",
|
||||
chan->generator_id, chan->generator_base);
|
||||
|
||||
/* Enable PWM controller (refer to TM4C1294NC 23.4.1) */
|
||||
|
||||
assert(chan->controller_id == 0);
|
||||
tiva_pwm_enablepwr(chan->controller_id);
|
||||
tiva_pwm_enableclk(chan->controller_id);
|
||||
|
||||
/* Configure PWM Clock Configuration (refer to TM4C1294NC 23.4.5) */
|
||||
/* on TM4C1294NC, configure the PWM clock source as 15MHz (the system clock 120MHz divided by 8) */
|
||||
/* TODO: need an algorithm to choose the best divider and load value combo */
|
||||
/* Configure PWM Clock Configuration (refer to TM4C1294NC 23.4.5)
|
||||
*
|
||||
* On TM4C1294NC, configure the PWM clock source as 15MHz (the system
|
||||
* clock 120MHz divided by 8)
|
||||
*
|
||||
* TODO: need an algorithm to choose the best divider and load value combo.
|
||||
*/
|
||||
|
||||
putreg32(CC_USEPWM << TIVA_PWM_CC_USEPWM | CC_PWMDIV_8 << TIVA_PWM_CC_PWMDIV,
|
||||
chan->controller_base + TIVA_PWM_CC);
|
||||
|
||||
return (FAR struct pwm_lowerhalf_s *)chan;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: board_pwm_setup
|
||||
*
|
||||
* Description:
|
||||
* No implementation for now, it's called by PWM tool.
|
||||
*
|
||||
* Input Parameters:
|
||||
* None.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on Success.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int board_pwm_setup(void)
|
||||
{
|
||||
return OK;
|
||||
}
|
||||
|
||||
@ -47,8 +47,6 @@
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct pwm_lowerhalf_s *tiva_pwm_initialize(int channel);
|
||||
|
||||
void tm4c_pwm_register(int channel);
|
||||
int board_pwm_setup(void);
|
||||
|
||||
#endif /* __ARCH_ARM_SRC_TIVA_TIVA_PWM_H */
|
||||
|
||||
@ -701,7 +701,7 @@ static ioe_pinset_t sim_int_update(FAR struct sim_dev_s *priv)
|
||||
}
|
||||
else /* if (SIM_LEVEL_SENSITIVE(priv, pin)) */
|
||||
{
|
||||
/* Level triggered. Set intstat if imatch in level type. */
|
||||
/* Level triggered. Set intstat if match in level type. */
|
||||
|
||||
if ((pinval && SIM_LEVEL_HIGH(priv, pin)) ||
|
||||
(!pinval && SIM_LEVEL_LOW(priv, pin)))
|
||||
|
||||
@ -37,13 +37,13 @@
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdint.h>
|
||||
#include <debug.h>
|
||||
|
||||
#include <nuttx/board.h>
|
||||
#include <nuttx/i2c/i2c_master.h>
|
||||
#include <arch/board/board.h>
|
||||
|
||||
@ -54,7 +54,6 @@
|
||||
#define PWM_PATH_FMT "/dev/pwm%d"
|
||||
#define PWM_PATH_FMTLEN (10)
|
||||
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
@ -171,7 +170,7 @@ void tm4c_pwm_register(int channel)
|
||||
dev = tiva_pwm_initialize(channel);
|
||||
if (dev == NULL)
|
||||
{
|
||||
dbg("ERROR: Failed to get PWM%d interface\n", channel);
|
||||
pwmerr("ERROR: Failed to get PWM%d interface\n", channel);
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -179,7 +178,8 @@ void tm4c_pwm_register(int channel)
|
||||
ret = pwm_register(pwm_path, dev);
|
||||
if (ret < 0)
|
||||
{
|
||||
dbg("ERROR: Failed to register PWM%d driver: %d\n", channel, ret);
|
||||
pwmerr("ERROR: Failed to register PWM%d driver: %d\n",
|
||||
channel, ret);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -193,7 +193,6 @@ void tm4c_pwm_register(int channel)
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef HAVE_PWM
|
||||
|
||||
static void tm4c_pwm(void)
|
||||
{
|
||||
#ifdef CONFIG_TIVA_PWM0_CHAN0
|
||||
@ -221,8 +220,7 @@ static void tm4c_pwm(void)
|
||||
tm4c_pwm_register(7);
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif
|
||||
#endif # HAVE_PWM
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
@ -246,9 +244,11 @@ int tm4c_bringup(void)
|
||||
|
||||
tm4c_i2ctool();
|
||||
|
||||
#ifdef HAVE_PWM
|
||||
/* Register PWM drivers */
|
||||
|
||||
tm4c_pwm();
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_TIMER
|
||||
/* Initialize the timer driver */
|
||||
@ -262,3 +262,26 @@ int tm4c_bringup(void)
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: board_pwm_setup
|
||||
*
|
||||
* Description:
|
||||
* No implementation for now, it's called by PWM tool via boardctl.h.
|
||||
* See include/nuttx/board.h
|
||||
*
|
||||
* Input Parameters:
|
||||
* None.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero on Success.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_BOARDCTL_PWMTEST
|
||||
int board_pwm_setup(void)
|
||||
{
|
||||
return OK;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user