nRF52: add I2C bitbang implementation
This commit is contained in:
Matias N
Brennan Ashton
parent
0fa34a0b64
commit
28caf27229
@ -133,6 +133,10 @@ ifeq ($(CONFIG_NRF52_I2C_MASTER),y)
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CHIP_CSRCS += nrf52_i2c.c
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endif
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ifeq ($(CONFIG_I2C_BITBANG),y)
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CHIP_CSRCS += nrf52_i2c_bitbang.c
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endif
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ifeq ($(CONFIG_NRF52_PPI),y)
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CHIP_CSRCS += nrf52_ppi.c
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endif
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175
arch/arm/src/nrf52/nrf52_i2c_bitbang.c
Normal file
175
arch/arm/src/nrf52/nrf52_i2c_bitbang.c
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@ -0,0 +1,175 @@
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/****************************************************************************
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* arch/arm/src/nrf52/nrf52_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 "nrf52_gpio.h"
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#include "arm_arch.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct nrf52_i2c_bitbang_dev_s
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{
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struct i2c_bitbang_lower_dev_s lower;
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nrf52_pinset_t sda_pin;
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nrf52_pinset_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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* Public Data
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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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#ifdef CONFIG_NRF52_HAVE_PORT1
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int port;
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#endif
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int pin;
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uint32_t base = NRF52_GPIO_P0_BASE;
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struct nrf52_i2c_bitbang_dev_s *dev = lower->priv;
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/* Set to output open-drain (and leave disconnected by writing 1) */
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nrf52_gpio_config(GPIO_OUTPUT | GPIO_VALUE_ONE |
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GPIO_DRIVE_H0D1 | dev->scl_pin);
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nrf52_gpio_config(GPIO_OUTPUT | GPIO_VALUE_ONE |
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GPIO_DRIVE_H0D1 | dev->sda_pin);
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/* Enable input buffer to read pin without having to switch direction */
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#ifdef CONFIG_NRF52_HAVE_PORT1
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port = GPIO_PORT_DECODE(dev->scl_pin);
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if (port == 1)
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{
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base = NRF52_GPIO_P1_BASE;
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}
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#endif
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pin = GPIO_PIN_DECODE(dev->scl_pin);
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modifyreg32(base + NRF52_GPIO_PIN_CNF_OFFSET(pin), GPIO_CNF_INPUT, 0);
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#ifdef CONFIG_NRF52_HAVE_PORT1
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port = GPIO_PORT_DECODE(dev->sda_pin);
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if (port == 1)
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{
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base = NRF52_GPIO_P1_BASE;
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}
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#endif
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pin = GPIO_PIN_DECODE(dev->sda_pin);
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modifyreg32(base + NRF52_GPIO_PIN_CNF_OFFSET(pin), GPIO_CNF_INPUT, 0);
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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 nrf52_i2c_bitbang_dev_s *dev = lower->priv;
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nrf52_gpio_write(dev->scl_pin, high);
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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 nrf52_i2c_bitbang_dev_s *dev = lower->priv;
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nrf52_gpio_write(dev->sda_pin, high);
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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 nrf52_i2c_bitbang_dev_s *dev = lower->priv;
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return nrf52_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 nrf52_i2c_bitbang_dev_s *dev = lower->priv;
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return nrf52_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 *nrf52_i2c_bitbang_initialize(nrf52_pinset_t sda_pin,
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nrf52_pinset_t scl_pin)
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{
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struct nrf52_i2c_bitbang_dev_s *dev =
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(struct nrf52_i2c_bitbang_dev_s *)
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kmm_zalloc(sizeof(struct nrf52_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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68
arch/arm/src/nrf52/nrf52_i2c_bitbang.h
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68
arch/arm/src/nrf52/nrf52_i2c_bitbang.h
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@ -0,0 +1,68 @@
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/****************************************************************************
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* arch/arm/src/nrf52/nrf52_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_NRF52_NRF52_I2C_BITBANG_H
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#define __ARCH_ARM_SRC_NRF52_NRF52_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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#include "nrf52_gpio.h"
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/****************************************************************************
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* Pre-processor Definitions
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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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#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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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct i2c_master_s *nrf52_i2c_bitbang_initialize(nrf52_pinset_t sda_pin,
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nrf52_pinset_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_NRF52_NRF52_I2C_BITBANG_H */
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