142 lines
5.0 KiB
C
142 lines
5.0 KiB
C
/****************************************************************************
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* arch/arm/src/efm32/efm32_pwm.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_EFM32_EFM32_PWM_H
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#define __ARCH_ARM_SRC_EFM32_EFM32_PWM_H
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/* The EFM32 does not have dedicated PWM hardware. Rather, pulsed output
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* control is a capability of the EFM32 timers. The logic in this file
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* implements the lower half of the standard, NuttX PWM interface using the
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* EFM32 timers. That interface is described in include/nuttx/timers/pwm.h.
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*/
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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 "chip.h"
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/* Configuration ************************************************************/
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/* Timer devices may be used for different purposes. One special purpose is
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* to generate modulated outputs for such things as motor control.
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* If CONFIG_EFM32_TIMERn is defined then the CONFIG_EFM32_TIMERn_PWM must
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* also be defined to indicate that timer "n" is intended to be used for
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* pulsed output signal generation.
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*/
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#ifndef CONFIG_EFM32_TIMER0
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# undef CONFIG_EFM32_TIMER0_PWM
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#endif
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#ifndef CONFIG_EFM32_TIMER1
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# undef CONFIG_EFM32_TIMER1_PWM
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#endif
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#ifndef CONFIG_EFM32_TIMER2
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# undef CONFIG_EFM32_TIMER2_PWM
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#endif
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#ifndef CONFIG_EFM32_TIMER3
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# undef CONFIG_EFM32_TIMER3_PWM
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#endif
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/* Check if PWM support for any channel is enabled. */
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#if defined(CONFIG_EFM32_TIMER0_PWM) || \
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defined(CONFIG_EFM32_TIMER1_PWM) || \
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defined(CONFIG_EFM32_TIMER2_PWM) || \
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defined(CONFIG_EFM32_TIMER3_PWM)
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#include <arch/board/board.h>
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#include "hardware/efm32_timer.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* For each timer that is enabled for PWM usage, we need the following
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* additional configuration settings:
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*
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* CONFIG_EFM32_TIMERx_CHANNEL - Specifies the timer output channel {0,1,3}
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* BOARD_PWM_TIMERx_PINCFG - Specifies the timer output pin configuration.
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* example : (GPIO_PORTC|GPIO_PIN0|GPIO_OUTPUT_PUSHPULL)
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*
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* BOARD_PWM_TIMERx_PINLOC - Specifies the timer output pin location.
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* example : _TIMER_ROUTE_LOCATION_LOC4
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*
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* BOARD_PWM_TIMERx_CLKIN - Specifies the timer input clock frequency
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* (in Hz). example : 48e6 for 48MHz
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*
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* NOTE: The EFM32 timers are each capable of generating different signals on
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* each of the four channels with different duty cycles. That capability is
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* not supported by this driver: Only one output channel per timer.
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*/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Functions Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: efm32_pwminitialize
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*
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* Description:
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* Initialize one timer for use with the upper_level PWM driver.
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*
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* Input Parameters:
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* timer - A number identifying the timer use. The number of valid timer
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* IDs varies with the EFM32 MCU and MCU family but is somewhere in
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* the range of {0,..,3}.
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*
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* Returned Value:
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* On success, a pointer to the EFM32 lower half PWM driver is returned.
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* NULL is returned on any failure.
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*
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****************************************************************************/
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struct pwm_lowerhalf_s *efm32_pwminitialize(int timer);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_EFM32_TIMERx_PWM */
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#endif /* __ARCH_ARM_SRC_EFM32_EFM32_PWM_H */
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