86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#include "i2c.h"
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#include <stm32f10x.h>
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void stm32_set_sda(void *data, rt_int32_t state)
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{
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if(state == 1)
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GPIO_SetBits(I2C1_GPIO , I2C1_GPIO_SDA); //GPIOB->BSRRL = I2C1_GPIO_SDA
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else if(state == 0)
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GPIO_ResetBits(I2C1_GPIO , I2C1_GPIO_SDA); //GPIOB->BSRRH = I2C1_GPIO_SDA
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}
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void stm32_set_scl(void *data, rt_int32_t state)
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{
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if(state == 1)
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GPIO_SetBits(I2C1_GPIO , I2C1_GPIO_SCL); //GPIOB->BSRRL = I2C1_GPIO_SCL
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else if(state == 0)
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GPIO_ResetBits(I2C1_GPIO , I2C1_GPIO_SCL); //GPIOB->BSRRH = I2C1_GPIO_SCL
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}
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rt_int32_t stm32_get_sda(void *data)
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{
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return (rt_int32_t)GPIO_ReadInputDataBit(I2C1_GPIO , I2C1_GPIO_SDA); //return(GPIOB->IDR & I2C1_GPIO_SDA)
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}
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rt_int32_t stm32_get_scl(void *data)
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{
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return (rt_int32_t)GPIO_ReadInputDataBit(I2C1_GPIO , I2C1_GPIO_SCL); //return(GPIOB->IDR & I2C1_GPIO_SCL)
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}
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void stm32_udelay(rt_uint32_t us)
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{
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rt_uint32_t delta;
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/* sysTick->LOAD=21000, RT_TICK_PER_SECOND=1000 */
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us = us * (SysTick->LOAD/(1000000/RT_TICK_PER_SECOND));
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delta = SysTick->VAL;
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/* delay us */
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while (delta - SysTick->VAL< us);
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}
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void stm32_mdelay(rt_uint32_t ms)
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{
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stm32_udelay(ms * 1000);
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}
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static const struct rt_i2c_bit_ops stm32_i2c_bit_ops =
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{
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(void*)0xaa, //no use in set_sda,set_scl,get_sda,get_scl
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stm32_set_sda,
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stm32_set_scl,
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stm32_get_sda,
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stm32_get_scl,
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stm32_udelay,
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20,
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};
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static void RCC_Configuration(void)
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{
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RCC->APB2ENR|=1<<4;
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RCC_APB2PeriphClockCmd( RCC_I2C, ENABLE );
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}
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static void GPIO_Configuration(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = I2C1_GPIO_SDA | I2C1_GPIO_SCL;
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GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_OD ;
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GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;
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GPIO_Init(I2C1_GPIO, &GPIO_InitStructure);
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}
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int rt_hw_i2c_init(void)
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{
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static struct rt_i2c_bus_device stm32_i2c;
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RCC_Configuration();
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GPIO_Configuration();
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rt_memset((void *)&stm32_i2c, 0, sizeof(struct rt_i2c_bus_device));
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stm32_i2c.priv = (void *)&stm32_i2c_bit_ops;
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rt_i2c_bit_add_bus(&stm32_i2c, "i2c1");
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return 0;
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}
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INIT_BOARD_EXPORT(rt_hw_i2c_init);
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