114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
/*
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* File : drv_i2c.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2017 RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2017-06-05 tanek first implementation.
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*/
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#include "drv_i2c.h"
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#include <board.h>
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#include <finsh.h>
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#include <rtdevice.h>
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#include <rthw.h>
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#define DEBUG
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#ifdef DEBUG
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#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
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#else
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#define DEBUG_PRINTF(...)
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#endif
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static void stm32f4_i2c_gpio_init()
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOH_CLK_ENABLE();
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GPIO_Initure.Pin = GPIO_PIN_4 | GPIO_PIN_5;
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GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
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GPIO_Initure.Pull = GPIO_PULLUP;
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GPIO_Initure.Speed = GPIO_SPEED_FAST;
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HAL_GPIO_Init(GPIOH, &GPIO_Initure);
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HAL_GPIO_WritePin(GPIOH, GPIO_PIN_5, GPIO_PIN_SET);
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HAL_GPIO_WritePin(GPIOH, GPIO_PIN_4, GPIO_PIN_SET);
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}
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static void stm32f4_set_sda(void *data, rt_int32_t state)
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{
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HAL_GPIO_WritePin(GPIOH, GPIO_PIN_5, (GPIO_PinState)state);
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}
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static void stm32f4_set_scl(void *data, rt_int32_t state)
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{
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HAL_GPIO_WritePin(GPIOH, GPIO_PIN_4, (GPIO_PinState)state);
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}
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static rt_int32_t stm32f4_get_sda(void *data)
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{
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return (rt_int32_t)HAL_GPIO_ReadPin(GPIOH, GPIO_PIN_5);
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}
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static rt_int32_t stm32f4_get_scl(void *data)
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{
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return (rt_int32_t)HAL_GPIO_ReadPin(GPIOH, GPIO_PIN_4);
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}
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static void stm32f4_udelay(rt_uint32_t us)
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{
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rt_int32_t i;
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for (; us > 0; us--)
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{
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i = 50;
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while (i > 0)
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{
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i--;
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}
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}
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}
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static const struct rt_i2c_bit_ops bit_ops = {
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RT_NULL,
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stm32f4_set_sda,
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stm32f4_set_scl,
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stm32f4_get_sda,
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stm32f4_get_scl,
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stm32f4_udelay,
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5,
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100
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};
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int stm32f4_i2c_init(void)
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{
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struct rt_i2c_bus_device *bus;
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bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
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if (bus == RT_NULL)
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{
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rt_kprintf("rt_malloc failed\n");
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return -RT_ENOMEM;
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}
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rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));
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bus->priv = (void *)&bit_ops;
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stm32f4_i2c_gpio_init();
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rt_i2c_bit_add_bus(bus, "i2c0");
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return RT_EOK;
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}
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INIT_DEVICE_EXPORT(stm32f4_i2c_init);
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