stm32cubemx IAP升级（四）

stm32cubemx IAP升级- 配置i2c从机

上一章讲了串口的方式升级，但是在android平台上，对mcu的升级还是i2c用的多一点，所以我们还配置了i2c从机，也是多一种升级方案嘛！

stm32 配置i2c从机，且采用dma的方式收发数据。

1、收发协议
cmd + data_lenght + data0 + …+ datax + checksum
1、获取版本号 0x01 0x02 0x00 0x00 checksum
2、升级
1、进入升级模式 0x02 0x02 0x00 0x00 checksum
2、升级文件大小 0x03 0x04 0x00 0x00 0x00 0x00 checksum
3、数据包发送 0x04 0x80 0x00 0x00 0x00 0x00 … checksum
4、数据包发送完成 0x05 0x02 0x00 0x00 checksum

2、在main.c 中while循环前添加
HAL_I2C_Slave_Seq_Receive_DMA(&hi2c2,I2C_ReceiveBuff,I2C_RECEIVE_DATA_LEN,I2C_LAST_FRAME);

其中I2C_ReceiveBuff 、I2C_RECEIVE_DATA_LEN为全局变量
uint8_t isRunningUpdate = 0;
uint16_t u16ReceiveBufLen = I2C_RECEIVE_DATA_LEN;
uint8_t I2C_ReceiveBuff[MAX_DATA_LENGTH];

因为iic收发数据要一致，比如主机发送6个数据，从机就要接收6 个数据。如果发送升级包的时候，要发送131个数据，那么从机也要相应的修改为接收131个数据，修改的就是u16ReceiveBufLen的值。

3、修改stm32l4xx_it.c的中断回调函数。

// I2c相关的回调函数

void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c)
{//printf("HAL_I2C_SlaveTxCpltCallback\\r\\n");
}// Slave 接收完成的回掉
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c)
{if(hi2c->Instance == hi2c2.Instance){int len =  u16ReceiveBufLen - __HAL_DMA_GET_COUNTER(&hdma_i2c2_rx);//printf("Slave I2c recvice data length == %d\\r\\n",len);handle_i2c_message(I2C_ReceiveBuff,len);}
}void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode)
{__HAL_I2C_CLEAR_FLAG(&hi2c2, I2C_FLAG_ADDR);if(TransferDirection == I2C_DIRECTION_RECEIVE)  {int len =  u16ReceiveBufLen - __HAL_DMA_GET_COUNTER(&hdma_i2c2_rx);send_i2c_message(I2C_ReceiveBuff, len);}else if (TransferDirection == I2C_DIRECTION_TRANSMIT){change_receiver_buff_len(I2C_ReceiveBuff);HAL_I2C_Slave_Seq_Receive_DMA(&hi2c2,I2C_ReceiveBuff,u16ReceiveBufLen,I2C_FIRST_AND_NEXT_FRAME);}
}void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c)
{if(HAL_I2C_EnableListen_IT(&hi2c2) != HAL_OK){printf("HAL_I2C_EnableListen_IT Error\\r\\n");}
}void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c)
{uint32_t lastErrorCode;lastErrorCode = HAL_I2C_GetError(hi2c); if (lastErrorCode >0)printf("HAL_I2C_ErrorCallback == %ld\\r\\n",lastErrorCode);if (lastErrorCode == HAL_I2C_ERROR_AF){if (__HAL_I2C_GET_FLAG(&hi2c2,I2C_FLAG_RXNE) == RESET) {int16_t u16ReceivedBufLen =  u16ReceiveBufLen - __HAL_DMA_GET_COUNTER(&hdma_i2c2_rx);printf("error recvice data length == %d\\r\\n",u16ReceivedBufLen);}} 
}

4、在i2c.c MX_I2C2_Init函数中添加。

if(HAL_I2C_EnableListen_IT(&hi2c2) != HAL_OK)
{printf("HAL_I2C_EnableListen_IT Error\\r\\n");
}

5、收发数据的处理函数

// 主机读 从机发送 处理函数
MI_BOOL send_i2c_message(MI_U8 *p_buff,MI_U32 len)
{switch (p_buff[UART_CMD_INDEX]){case I2C_GET_SYSTEM_VERSION_CMD/* constant-expression */:/* 获取系统版本号 */if (calculate_checksum_and_length(p_buff,len) == MI_TRUE){system_info_get_system_version(version);HAL_I2C_Slave_Seq_Transmit_DMA(&hi2c2, (MI_U8 *)version, strlen((MI_CHAR *)version), I2C_LAST_FRAME);}break;default:break;}    return MI_TRUE;
}

// 主机写 从机读处理函数

	MI_BOOL handle_i2c_message(MI_U8 *p_buff,MI_U32 len){switch (p_buff[I2C_CMD_INDEX]){case I2C_GET_SYSTEM_VERSION_CMD/* constant-expression */:/* 获取系统版本号 *//* Noting to do send_i2c_message 中处理*/break;case I2C_ENTER_SYSTEM_UPDATE_MODE_CMD:/* 进入升级模式命令 指示灯变为100ms闪烁一次*/if (calculate_checksum_and_length(p_buff,len) == MI_TRUE){led_freq = LED_TOGGLE_100_MS;w_time = 0;packets_numer = 0;upgrade_file_size = 0;remain_packets_numer = 0;isRunningUpdate = 1;printf("Mcu Receive Update Command and Wait Receive Data Packets \\r\\n");printf("Now to Erase Download Pages \\r\\n");printf("\\r\\n");int ret = stm32_erase_flash(DOWNLOAD_START_SECTOR_ADDR,DOWNLOAD_END_SECTOR_ADDR);printf("\\r\\n");}break; case I2C_GET_SYSTEM_FILE_SIZE_CMD:if (calculate_checksum_and_length(p_buff,len) == MI_TRUE){int a = (int)p_buff[2];int b = (int)p_buff[3];int c = (int)p_buff[4];int d = (int)p_buff[5];upgrade_file_size = (a<<24) | (b<<16) | (c<<8) | (d);if (upgrade_file_size % UPGRADE_DATA_PACKAGES_LENGHT == 0)  //如果整除128 {packets_numer = upgrade_file_size/128;}else{packets_numer = ((upgrade_file_size/128) + 1);}printf("End Erase Download Pages Down\\r\\n");printf("\\r\\n");printf("receive upgrade file size %d\\r\\n",upgrade_file_size);printf("data packets number  %d\\r\\n",packets_numer);printf("\\r\\n");}break; case I2C_RECEIVE_SYSTEM_UPDATE_CMD:if (calculate_checksum_and_length(p_buff,len) == MI_TRUE){printf("receive packets........................%03d [100] \\r\\n",(((w_time + 1) * 100) / packets_numer));memset(w_buff,0,sizeof(w_buff));memcpy(w_buff,&p_buff[2],sizeof(w_buff));stm32_flash_write(DOWNLOAD_START_SECTOR_ADDR+(w_time * UPGRADE_DATA_PACKAGES_LENGHT),w_buff,sizeof(w_buff));if (w_time + 1 == packets_numer){led_freq = LED_TOGGLE_1000_MS;printf("receive packets........................ done!\\r\\n");}w_time ++;}break;case I2C_COMPLETE_SYSTEM_UPDATE_CMD:if (calculate_checksum_and_length(p_buff,len) == MI_TRUE){system_info_set_update_flag(SYSTEM_UPDATE);printf("Now Reboot !\\r\\n");app_soft_reset();}break;                       default:break;}    return MI_TRUE;}

更改接收数据长度的函数

MI_BOOL change_receiver_buff_len(MI_U8 *p_buff)
{switch (p_buff[0]){case I2C_ENTER_SYSTEM_UPDATE_MODE_CMD/* constant-expression */:/* code */u16ReceiveBufLen = 8; //File size cmd lenght = 8,so receive enter mcu upgrade mode and change this vaule to 8break;case I2C_GET_SYSTEM_FILE_SIZE_CMD:u16ReceiveBufLen = 132;  //file package cmd length = 132break;case I2C_RECEIVE_SYSTEM_UPDATE_CMD:if (w_time == packets_numer)  //file pcakage receive end and change receiver buff length equal = 6;{u16ReceiveBufLen = I2C_RECEIVE_DATA_LEN;}break;default:break;}return MI_TRUE;
}

收到的数据一包包写入download分区即可。