stm32cubemx IAP升级- UART+DMA实现不定长收发数据
板卡：Nucleo-L412
平台：macbook pro
工具：vscode stm32cubemx stm32cubeProgramer cmake toolchain
Stm32CubeMx的配置
选择开启一路串口并配置成DMA，并使能中断，配置中断优先级。
## 代码实现
main.c
1、定义全局接收数组
uint8_t UART2_RX_BUF[UART2_RX_SIZE] = {0}; //串口接收缓存
uint8_t UART2_RX_LEN;
2、使能空闲中断，以及DMA接收数据
__HAL_UART_ENABLE_IT(&huart2,UART_IT_IDLE); //使能空闲中断
HAL_UART_Receive_DMA(&huart2,UART2_RX_BUF,UART2_RX_SIZE); //启动DMA接收，UART1_RX_BUF：数据接收缓冲
3、修改stm32l4xx_it.c,将USART2_IRQHandler函数修改如下
void USART2_IRQHandler(void)
{
/* USER CODE BEGIN USART2_IRQn 0 */
/* USER CODE END USART2_IRQn 0 */
HAL_UART_IRQHandler(&huart2);
/* USER CODE BEGIN USART2_IRQn 1 */
if((__HAL_UART_GET_FLAG(&huart2,UART_FLAG_IDLE) != RESET))
{
__HAL_UART_CLEAR_IDLEFLAG(&huart2); //清除空闲状态标志
HAL_UART_DMAStop(&huart2); //关闭DMA传输
UART2_RX_LEN = UART2_RX_SIZE - __HAL_DMA_GET_COUNTER(&hdma_usart2_rx); //计算接收到的数据长度
USAR_UART_IDLECallback(&huart2,UART2_RX_LEN ); //调用回调函数
}
/* USER CODE END USART2_IRQn 1 */
}
USAR_UART_IDLECallback函数定义，UART2_RX_BUF即收到的数据，rxlen即为收到数据的长度
void USAR_UART_IDLECallback(UART_HandleTypeDef *huart,uint8_t rxlen )
{
if(huart == &huart2) //判断是否为串口1产生中断
{
if (rxlen >0)
handle_uart_message(UART2_RX_BUF,rxlen);
// HAL_UART_Transmit_DMA(&huart2, UART2_RX_BUF,rxlen); //将接收到的不定长数据发送到上位机
rxlen = 0; //清除数据长度计数
HAL_UART_Receive_DMA(&huart2,UART2_RX_BUF,UART2_RX_SIZE); //重新打开DMA接收
}
}
handle_uart_message函数为收到升级命令，数据，以及升级完成的命令的解析函数。
串口升级协议如下：
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
typedef enum uart_update_cmd
{
UART_GET_SYSTEM_VERSION_CMD = 0x01,
UART_ENTER_SYSTEM_UPDATE_MODE_CMD = 0x02,
UART_GET_SYSTEM_FILE_SIZE_CMD = 0x03,
UART_RECEIVE_SYSTEM_UPDATE_CMD = 0x04,
UART_COMPLETE_SYSTEM_UPDATE_CMD = 0x05,
}MI_UartUpdateCmd;
MI_BOOL handle_uart_message(MI_U8 *p_buff,MI_U32 len)
{
switch (p_buff[UART_CMD_INDEX])
{
case UART_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_UART_Transmit_DMA(&huart2, version,strlen((const char *)version)); //将接收到的不定长数据发送到上位机
}
break;
case UART_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 UART_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 UART_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 UART_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;
}
校验采用CRC16
static MI_U16 CRC16(MI_U8 * buf, MI_U16 len)
{
MI_U16 i;
MI_U16 crc = 0xffff;
if (len == 0) {
len = 1;
}
while (len--) {
crc ^= *buf;
for (i = 0; i<8; i++)
{
if (crc & 1) {
crc >>= 1;
crc ^= 0xA001;
}
else {
crc >>= 1;
}
}
buf++;
}
return(crc);
}
static MI_BOOL calculate_checksum_and_length(MI_U8 * buf, MI_U16 len)
{
MI_U16 crc16 = CRC16(buf,len-2);
if ((crc16 & 0x00ff) == buf[len-2] && ((crc16 >> 8) & 0x00ff) == buf[len-1])
{
if (buf[UART_CMD_LENGTH] == (len-2-2))
{
return MI_TRUE;
}
else
{
printf("crc16 right ,but cmd error\r\n");
//_Error_Handler(__FUNCTION__,__LINE__);
return MI_FALSE;
}
}
else
{
printf("crc16 error and right crc16 = 0x%04x\r\n",crc16);
//_Error_Handler(__FUNCTION__,__LINE__);
return MI_FALSE;
}
}
flash写函数：
/* FLASH大小：STM32L412 :128K */
#define STM32_FLASH_SIZE 0x00020000UL
/* FLASH起始地址 */
#define STM32_FLASH_BASE 0x08000000UL
/* FLASH结束地址 */
#define STM32_FLASH_END (STM32_FLASH_BASE | STM32_FLASH_SIZE)
/* FLASH页大小：2K */
#define STM32_FLASH_PAGE_SIZE FLASH_PAGE_SIZE
/* FLASH总页数 64 页*/
#define STM32_FLASH_PAGE_NUM (STM32_FLASH_SIZE / STM32_FLASH_PAGE_SIZE)
//针对STM32L412单片机，通过地址获取所在页的函数如下
MI_U32 get_flash_page(MI_U32 address) //获取地址所在的
{
MI_U32 page = 0;
if (address < (STM32_FLASH_BASE + FLASH_BANK_SIZE))
page = (address - STM32_FLASH_BASE) / FLASH_PAGE_SIZE;
else
page = (address - (STM32_FLASH_BASE + FLASH_BANK_SIZE)) / FLASH_PAGE_SIZE;
return page;
}
MI_U8 stm32_erase_flash(MI_U32 start_addr,MI_U32 end_addr) //擦除flash
{
FLASH_EraseInitTypeDef EraseInitStruct;
MI_U32 FirstPages = 0,LastPages = 0, NbPages = 0;
uint32_t pageError = 0;
HAL_FLASH_Unlock(); //首先解锁flash
FirstPages = get_flash_page(start_addr); //获取要擦除的第一个页
LastPages = get_flash_page(end_addr);
NbPages = LastPages - FirstPages; //获取擦除的页数量
/* Fill EraseInit structure*/
EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES; //页擦除
EraseInitStruct.Banks = FLASH_BANK_1;
EraseInitStruct.Page = FirstPages;
EraseInitStruct.NbPages = NbPages;
if(HAL_FLASHEx_Erase(&EraseInitStruct, &pageError) != HAL_OK)
{
HAL_FLASH_Lock(); //上锁
return 2; //擦除有错误，返回2
}
//下面这些是清除标志位
__HAL_FLASH_DATA_CACHE_DISABLE();
__HAL_FLASH_INSTRUCTION_CACHE_DISABLE();
__HAL_FLASH_DATA_CACHE_RESET();
__HAL_FLASH_INSTRUCTION_CACHE_RESET();
__HAL_FLASH_INSTRUCTION_CACHE_ENABLE();
__HAL_FLASH_DATA_CACHE_ENABLE();
HAL_FLASH_Lock(); //上锁
return 0;
}
MI_BOOL stm32_flash_write(MI_U32 dest_addr, MI_U8 *src, MI_U32 Len)
{
MI_U32 i = 0;
HAL_FLASH_Unlock();
/* Clear OPTVERR bit set on virgin samples */
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
for(i = 0; i < Len; i += 8)
{
/* Device voltage range supposed to be [2.7V to 3.6V], the operation will
be done by byte */
if(HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, (MI_U32)(dest_addr+i), *(uint64_t*)(src+i)) == HAL_OK)
{
/* Check the written value */
if(*(uint64_t *)(src + i) != *(uint64_t*)(dest_addr+i))
{
/* Flash content doesn't match SRAM content */
HAL_FLASH_Lock();
return -1;
}
}
else
{
HAL_FLASH_Lock();
/* Error occurred while writing data in Flash memory */
return -1;
}
}
HAL_FLASH_Lock();
return 0;
}
针对L412单片机，写入时是按FLASH_TYPEPROGRAM_DOUBLEWORD格式写入的，所以要8个地址++，这点要注意。
