arch: cxd56xx: Add I2C bitbang lower driver
Add I2C bitbang lower driver for cxd56xx.
This commit is contained in:
baggio63446333
Alan Carvalho de Assis
parent
90ffb03903
commit
7723ce46ce
@ -149,6 +149,10 @@ ifeq ($(CONFIG_CXD56_I2C),y)
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CHIP_CSRCS += cxd56_i2c.c
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endif
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ifeq ($(CONFIG_I2C_BITBANG),y)
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CHIP_CSRCS += cxd56_i2c_bitbang.c
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endif
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ifeq ($(CONFIG_CXD56_DMAC),y)
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CHIP_CSRCS += cxd56_dmac.c
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endif
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141
arch/arm/src/cxd56xx/cxd56_i2c_bitbang.c
Normal file
141
arch/arm/src/cxd56xx/cxd56_i2c_bitbang.c
Normal file
@ -0,0 +1,141 @@
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/****************************************************************************
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* arch/arm/src/cxd56/cxd56_i2c_bitbang.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/i2c/i2c_bitbang.h>
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#include <nuttx/kmalloc.h>
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#include <arch/board/board.h>
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#include <arch/chip/pin.h>
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct cxd56_i2c_bitbang_dev_s
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{
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struct i2c_bitbang_lower_dev_s lower;
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uint32_t sda_pin;
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uint32_t scl_pin;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void i2c_bb_initialize(FAR struct i2c_bitbang_lower_dev_s *lower);
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static void i2c_bb_set_scl(FAR struct i2c_bitbang_lower_dev_s *lower,
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bool high);
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static void i2c_bb_set_sda(FAR struct i2c_bitbang_lower_dev_s *lower,
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bool high);
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static bool i2c_bb_get_scl(FAR struct i2c_bitbang_lower_dev_s *lower);
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static bool i2c_bb_get_sda(FAR struct i2c_bitbang_lower_dev_s *lower);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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const static struct i2c_bitbang_lower_ops_s g_ops =
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{
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.initialize = i2c_bb_initialize,
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.set_scl = i2c_bb_set_scl,
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.set_sda = i2c_bb_set_sda,
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.get_scl = i2c_bb_get_scl,
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.get_sda = i2c_bb_get_sda
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void i2c_bb_initialize(FAR struct i2c_bitbang_lower_dev_s *lower)
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{
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struct cxd56_i2c_bitbang_dev_s *dev = lower->priv;
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/* Set to input enable and pull-up */
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board_gpio_config(dev->scl_pin, 0, true, true, PIN_PULLUP);
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board_gpio_config(dev->sda_pin, 0, true, true, PIN_PULLUP);
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}
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static void i2c_bb_set_scl(FAR struct i2c_bitbang_lower_dev_s *lower,
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bool high)
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{
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struct cxd56_i2c_bitbang_dev_s *dev = lower->priv;
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int value;
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/* If set high, pin is pulled up by output disable */
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value = (high) ? -1 : 0;
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board_gpio_write(dev->scl_pin, value);
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}
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static void i2c_bb_set_sda(FAR struct i2c_bitbang_lower_dev_s *lower,
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bool high)
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{
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struct cxd56_i2c_bitbang_dev_s *dev = lower->priv;
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int value;
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/* If set high, pin is pulled up by output disable */
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value = (high) ? -1 : 0;
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board_gpio_write(dev->sda_pin, value);
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}
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static bool i2c_bb_get_scl(FAR struct i2c_bitbang_lower_dev_s *lower)
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{
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struct cxd56_i2c_bitbang_dev_s *dev = lower->priv;
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return board_gpio_read(dev->scl_pin);
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}
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static bool i2c_bb_get_sda(FAR struct i2c_bitbang_lower_dev_s *lower)
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{
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struct cxd56_i2c_bitbang_dev_s *dev = lower->priv;
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return board_gpio_read(dev->sda_pin);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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struct i2c_master_s *cxd56_i2c_bitbang_initialize(uint32_t sda_pin,
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uint32_t scl_pin)
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{
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struct cxd56_i2c_bitbang_dev_s *dev =
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(struct cxd56_i2c_bitbang_dev_s *)
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kmm_zalloc(sizeof(struct cxd56_i2c_bitbang_dev_s));
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DEBUGASSERT(dev);
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dev->lower.ops = &g_ops;
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dev->lower.priv = dev;
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dev->scl_pin = scl_pin;
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dev->sda_pin = sda_pin;
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return i2c_bitbang_initialize(&dev->lower);
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}
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51
arch/arm/src/cxd56xx/cxd56_i2c_bitbang.h
Normal file
51
arch/arm/src/cxd56xx/cxd56_i2c_bitbang.h
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@ -0,0 +1,51 @@
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/****************************************************************************
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* arch/arm/src/cxd56/cxd56_i2c_bitbang.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_CXD56_CXD56_I2C_BITBANG_H
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#define __ARCH_ARM_SRC_CXD56_CXD56_I2C_BITBANG_H
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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 <nuttx/i2c/i2c_master.h>
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#ifdef __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 Function Prototypes
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****************************************************************************/
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struct i2c_master_s *cxd56_i2c_bitbang_initialize(uint32_t sda_pin,
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uint32_t scl_pin);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ARCH_ARM_SRC_CXD56_CXD56_I2C_BITBANG_H */
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