157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/**
|
||
******************************************************************************
|
||
* @file i2c.c
|
||
* @author fire
|
||
* @version V1.0
|
||
* @date 2015-xx-xx
|
||
* @brief i2c 总线驱动，方便与各种I2C传感器通讯。
|
||
******************************************************************************
|
||
* @attention
|
||
*
|
||
* 实验平台:野火 STM32 H750 开发板
|
||
* 论坛 :http://www.firebbs.cn
|
||
* 淘宝 :http://firestm32.taobao.com
|
||
*
|
||
******************************************************************************
|
||
*/
|
||
#include "./i2c/i2c.h"
|
||
|
||
|
||
I2C_HandleTypeDef I2C_Handle;
|
||
/******************************* Function ************************************/
|
||
|
||
/**
|
||
* @brief 初始化I2C总线，使用I2C前需要调用
|
||
* @param 无
|
||
* @retval 无
|
||
*/
|
||
void I2cMaster_Init(void)
|
||
{
|
||
GPIO_InitTypeDef GPIO_InitStructure;
|
||
|
||
/* 使能I2Cx时钟 */
|
||
SENSORS_I2C_RCC_CLK_ENABLE();
|
||
|
||
/* 使能I2C GPIO 时钟 */
|
||
SENSORS_I2C_SCL_GPIO_CLK_ENABLE();
|
||
SENSORS_I2C_SDA_GPIO_CLK_ENABLE();
|
||
|
||
/* 配置I2Cx引脚: SCL ----------------------------------------*/
|
||
GPIO_InitStructure.Pin = SENSORS_I2C_SCL_GPIO_PIN;
|
||
GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
|
||
GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
|
||
GPIO_InitStructure.Pull= GPIO_NOPULL;
|
||
GPIO_InitStructure.Alternate=SENSORS_I2C_AF;
|
||
HAL_GPIO_Init(SENSORS_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
|
||
|
||
/* 配置I2Cx引脚: SDA ----------------------------------------*/
|
||
GPIO_InitStructure.Pin = SENSORS_I2C_SDA_GPIO_PIN;
|
||
HAL_GPIO_Init(SENSORS_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
|
||
|
||
if(HAL_I2C_GetState(&I2C_Handle) == HAL_I2C_STATE_RESET)
|
||
{
|
||
/* 强制复位I2C外设时钟 */
|
||
SENSORS_I2C_FORCE_RESET();
|
||
|
||
/* 释放I2C外设时钟复位 */
|
||
SENSORS_I2C_RELEASE_RESET();
|
||
|
||
/* I2C 配置 */
|
||
I2C_Handle.Instance = SENSORS_I2C;
|
||
I2C_Handle.Init.Timing = 0x40604E73;//100KHz
|
||
I2C_Handle.Init.OwnAddress1 = 0;
|
||
I2C_Handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
|
||
I2C_Handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
|
||
I2C_Handle.Init.OwnAddress2 = 0;
|
||
I2C_Handle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
|
||
I2C_Handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
|
||
I2C_Handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
|
||
|
||
/* 初始化I2C */
|
||
HAL_I2C_Init(&I2C_Handle);
|
||
/* 使能模拟滤波器 */
|
||
HAL_I2CEx_AnalogFilter_Config(&I2C_Handle, I2C_ANALOGFILTER_ENABLE);
|
||
}
|
||
}
|
||
/**
|
||
* @brief Manages error callback by re-initializing I2C.
|
||
* @param Addr: I2C Address
|
||
* @retval None
|
||
*/
|
||
static void I2Cx_Error(uint8_t Addr)
|
||
{
|
||
/* 恢复I2C寄存器为默认值 */
|
||
HAL_I2C_DeInit(&I2C_Handle);
|
||
/* 重新初始化I2C外设 */
|
||
I2cMaster_Init();
|
||
}
|
||
/**
|
||
* @brief 写寄存器，这是提供给上层的接口
|
||
* @param slave_addr: 从机地址
|
||
* @param reg_addr:寄存器地址
|
||
* @param len：写入的长度
|
||
* @param data_ptr:指向要写入的数据
|
||
* @retval 正常为0，不正常为非0
|
||
*/
|
||
int Sensors_I2C_WriteRegister(unsigned char slave_addr,
|
||
unsigned char reg_addr,
|
||
unsigned short len,
|
||
unsigned char *data_ptr)
|
||
{
|
||
HAL_StatusTypeDef status = HAL_OK;
|
||
status = HAL_I2C_Mem_Write(&I2C_Handle, slave_addr, reg_addr, I2C_MEMADD_SIZE_8BIT,data_ptr, len,I2Cx_FLAG_TIMEOUT);
|
||
/* 检查通讯状态 */
|
||
if(status != HAL_OK)
|
||
{
|
||
/* 总线出错处理 */
|
||
I2Cx_Error(slave_addr);
|
||
}
|
||
while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY)
|
||
{
|
||
|
||
}
|
||
/* 检查SENSOR是否就绪进行下一次读写操作 */
|
||
while (HAL_I2C_IsDeviceReady(&I2C_Handle, slave_addr, I2Cx_FLAG_TIMEOUT, I2Cx_FLAG_TIMEOUT) == HAL_TIMEOUT);
|
||
/* 等待传输结束 */
|
||
while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY)
|
||
{
|
||
|
||
}
|
||
return status;
|
||
}
|
||
|
||
/**
|
||
* @brief 读寄存器，这是提供给上层的接口
|
||
* @param slave_addr: 从机地址
|
||
* @param reg_addr:寄存器地址
|
||
* @param len：要读取的长度
|
||
* @param data_ptr:指向要存储数据的指针
|
||
* @retval 正常为0，不正常为非0
|
||
*/
|
||
int Sensors_I2C_ReadRegister(unsigned char slave_addr,
|
||
unsigned char reg_addr,
|
||
unsigned short len,
|
||
unsigned char *data_ptr)
|
||
{
|
||
HAL_StatusTypeDef status = HAL_OK;
|
||
status =HAL_I2C_Mem_Read(&I2C_Handle,slave_addr,reg_addr,I2C_MEMADD_SIZE_8BIT,data_ptr,len,I2Cx_FLAG_TIMEOUT);
|
||
/* 检查通讯状态 */
|
||
if(status != HAL_OK)
|
||
{
|
||
/* 总线出错处理 */
|
||
I2Cx_Error(slave_addr);
|
||
}
|
||
while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY)
|
||
{
|
||
|
||
}
|
||
/* 检查SENSOR是否就绪进行下一次读写操作 */
|
||
while (HAL_I2C_IsDeviceReady(&I2C_Handle, slave_addr, I2Cx_FLAG_TIMEOUT, I2Cx_FLAG_TIMEOUT) == HAL_TIMEOUT);
|
||
/* 等待传输结束 */
|
||
while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY)
|
||
{
|
||
|
||
}
|
||
return status;
|
||
}
|