STM32 I2C模拟问题

发布于 2014-10-02 13:09:56 浏览：5875 订阅该版

```/*
设置文件
*/
#include "stm32f10x.h"
#include "rtdef.h"
#include "i2c.h"
#include "i2c-bit-ops.h"
#include "board.h"
#include <core_cm3.h>
#include <rtdevice.h>

//GPIO 设置 i2c2与usart3脚相同 i2c1与FSMC引脚冲突

/* I2C2 */ 
#define I2C2_GPIO_SCL GPIO_Pin_10
#define I2C2_GPIO_SDA GPIO_Pin_11
#define I2C2_GPIO GPIOB

/* GPIO */
void GPIO_Configuration(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	GPIO_InitStructure.GPIO_Pin = I2C2_GPIO_SCL|I2C2_GPIO_SDA;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;    
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(I2C2_GPIO, &GPIO_InitStructure);
	GPIO_SetBits(I2C2_GPIO,I2C2_GPIO_SCL|I2C2_GPIO_SDA); 	 
}

/* RCC */
void RCC_Configuration()
{
	RCC_APB2PeriphClockCmd(	RCC_APB2Periph_GPIOB, ENABLE );	
}
    
/* rt_hw_i2c_init */

void stm32_set_sda(void *data, rt_int32_t state)
{
	if(state==1)
		GPIO_SetBits(I2C2_GPIO,I2C2_GPIO_SDA); 
	else if(state==0)
		GPIO_ResetBits(I2C2_GPIO,I2C2_GPIO_SDA); 
}

void stm32_set_scl(void *data, rt_int32_t state)
{
	if(state==1)
		GPIO_SetBits(I2C2_GPIO,I2C2_GPIO_SCL); 
	else if(state==0)
		GPIO_ResetBits(I2C2_GPIO,I2C2_GPIO_SCL); 
}

/* 读i2c线状态 */
rt_int32_t stm32_get_sda(void *data)
{
	return RT_EOK;
}
rt_int32_t stm32_get_scl(void *data)
{
	return RT_EOK;
}

void stm32_udelay(rt_uint32_t us)
{
	rt_uint32_t delta;
	/* 获得延时经过的tick数 */
	us = us * (SysTick->LOAD/(1000000/RT_TICK_PER_SECOND));
	/* 获得当前时间 */
	delta = SysTick->VAL;
	/* 循环获得当前时间，直到达到指定的时间后退出循环 */
	while (delta - SysTick->VAL< us);
}

static const struct  rt_i2c_bit_ops stm32_i2c_bit_ops =
{
//	.data    = 
	(void*)0xaa,
//	.set_sda = 
	stm32_set_sda,
//	.set_scl = 
	stm32_set_scl,
//	.get_sda = 
	stm32_get_sda,
//	.get_scl = 
	stm32_get_scl,
//	.udelay = 
	stm32_udelay,
//	.delay_us = 
	20,
//	.timeout = 
	5
};

void rt_hw_i2c_init(void)
{
    struct rt_i2c_bus_device stm32_i2c;
	
    RCC_Configuration();
    GPIO_Configuration();
	
	rt_memset((void *)&stm32_i2c, 0, sizeof(struct rt_i2c_bus_device));
	stm32_i2c.ops = (void *)&stm32_i2c_bit_ops;
	rt_i2c_bit_add_bus(&stm32_i2c, "i2c");
	
}
```

这是我写的I2C模拟驱动的借口部分，调试的时候会死在rt_i2c_bit_add_bus的断言部分，提示i2c设备结构private部分为空。
给private填充值之后，又会死在rt_mutex_take里的RT_DEBUG_IN_THREAD_CONTEXT上。

初学者已经弄了好多天了，请各路大神指条明路。。。。