162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/**
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******************************************************************************
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* @file i2c.c
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* @author fire
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* @version V1.0
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* @date 2015-xx-xx
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* @brief i2c 总线驱动，方便与各种I2C传感器通讯。
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******************************************************************************
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* @attention
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*
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* 实验平台:野火 STM32 H750 开发板
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* 论坛 :http://www.firebbs.cn
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* 淘宝 :http://firestm32.taobao.com
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*
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******************************************************************************
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*/
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#include "./i2c/bsp_i2c.h"
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#include "./delay/core_delay.h"
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I2C_HandleTypeDef I2C_Handle;
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/******************************* Function ************************************/
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/**
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* @brief 初始化I2C总线，使用I2C前需要调用
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* @param 无
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* @retval 无
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*/
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void I2CMaster_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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/* 使能I2Cx时钟 */
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SENSORS_I2C_RCC_CLK_ENABLE();
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/* 使能I2C GPIO 时钟 */
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SENSORS_I2C_SCL_GPIO_CLK_ENABLE();
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SENSORS_I2C_SDA_GPIO_CLK_ENABLE();
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/* 配置I2Cx引脚: SCL ----------------------------------------*/
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GPIO_InitStructure.Pin = SENSORS_I2C_SCL_GPIO_PIN;
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GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStructure.Pull= GPIO_NOPULL;
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GPIO_InitStructure.Alternate=SENSORS_I2C_AF;
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HAL_GPIO_Init(SENSORS_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
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/* 配置I2Cx引脚: SDA ----------------------------------------*/
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GPIO_InitStructure.Pin = SENSORS_I2C_SDA_GPIO_PIN;
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HAL_GPIO_Init(SENSORS_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
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if(HAL_I2C_GetState(&I2C_Handle) == HAL_I2C_STATE_RESET)
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{
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/* 强制复位I2C外设时钟 */
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SENSORS_I2C_FORCE_RESET();
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/* 释放I2C外设时钟复位 */
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SENSORS_I2C_RELEASE_RESET();
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/* I2C 配置 */
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I2C_Handle.Instance = SENSORS_I2C;
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I2C_Handle.Init.Timing = 0x40604E73;//100KHz
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I2C_Handle.Init.OwnAddress1 = 0;
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I2C_Handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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I2C_Handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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I2C_Handle.Init.OwnAddress2 = 0;
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I2C_Handle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
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I2C_Handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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I2C_Handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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/* 初始化I2C */
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HAL_I2C_Init(&I2C_Handle);
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/* 使能模拟滤波器 */
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HAL_I2CEx_AnalogFilter_Config(&I2C_Handle, I2C_ANALOGFILTER_ENABLE);
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}
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Delay(100);
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}
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/**
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* @brief Manages error callback by re-initializing I2C.
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* @param Addr: I2C Address
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* @retval None
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*/
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static void I2Cx_Error(void)
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{
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/* 恢复I2C寄存器为默认值 */
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HAL_I2C_DeInit(&I2C_Handle);
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/* 重新初始化I2C外设 */
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I2CMaster_Init();
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}
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/**
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* @brief 写一字节数据到OV2640寄存器
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* @param Addr: OV2640 的寄存器地址
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* @param Data: 要写入的数据
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* @retval 返回0表示写入正常，0xFF表示错误
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*/
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uint8_t OV5640_WriteReg(uint16_t Addr, uint8_t Data)
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{
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// I2Cx_WriteMultiple(&I2C_Handle, OV2640_DEVICE_WRITE_ADDRESS, (uint16_t)Addr, I2C_MEMADD_SIZE_8BIT,(uint8_t*)&Data, 1);
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HAL_StatusTypeDef status = HAL_OK;
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status = HAL_I2C_Mem_Write(&I2C_Handle, OV5640_DEVICE_ADDRESS, (uint16_t)Addr, I2C_MEMADD_SIZE_16BIT, (uint8_t*)&Data, 1, 1000);
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/* Check the communication status */
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if(status != HAL_OK)
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{
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/* Re-Initiaize the I2C Bus */
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I2Cx_Error();
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}
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return status;
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}
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/**
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* @brief 从OV2640寄存器中读取一个字节的数据
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* @param Addr: 寄存器地址
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* @retval 返回读取得的数据
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*/
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uint8_t OV5640_ReadReg(uint16_t Addr)
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{
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uint8_t Data = 0;
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// I2Cx_ReadMultiple(&I2C_Handle, OV2640_DEVICE_READ_ADDRESS, Addr, I2C_MEMADD_SIZE_8BIT, (uint8_t*)&Data, 1);
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HAL_StatusTypeDef status = HAL_OK;
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status = HAL_I2C_Mem_Read(&I2C_Handle, OV5640_DEVICE_ADDRESS, (uint16_t)Addr, I2C_MEMADD_SIZE_16BIT, (uint8_t*)&Data, 1, 1000);
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/* Check the communication status */
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if(status != HAL_OK)
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{
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/* I2C error occurred */
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I2Cx_Error();
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}
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/* return the read data */
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return Data;
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}
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/**
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* @brief 将固件写入到OV5640片内MCU
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* @param Addr: OV5640 的MCU基地址0x8000
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* @param Data: 要写入的数据
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* @retval 返回0表示写入正常，0xFF表示错误
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*/
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uint8_t OV5640_WriteFW(uint8_t *pBuffer ,uint16_t BufferSize)
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{
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uint16_t Addr=0x8000;
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HAL_StatusTypeDef status = HAL_OK;
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status = HAL_I2C_Mem_Write(&I2C_Handle, OV5640_DEVICE_ADDRESS, (uint16_t)Addr, I2C_MEMADD_SIZE_16BIT, pBuffer, BufferSize, 1000);
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/* 检查通信状态 */
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if(status != HAL_OK)
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{
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/* 发生错误重新初始化I2C */
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I2Cx_Error();
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}
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return status;
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}
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