RTX系统下串口DMA第一帧发送数据全为0，第二帧正常
1、使用RTX系统后，串口DMA发送数据第一帧全为0，但是数据个数是对的，封装的发送函数如下ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000000")))) uint8_t send_com8_buff;//ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000100")))) uint8_t send_com1_buff;//
ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000200")))) uint8_t send_com2_buff;//
ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000300")))) uint8_t send_com4_buff;//
ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000400")))) uint8_t send_com6_buff;//
ALIGN_32BYTES(__attribute__((section(".ARM.__at_0x24000500")))) uint8_t send_com3_buff;//
uint16_t comSendBuf(COM_PORT_E _ucPort, uint8_t* _ucaBuf, uint16_t _usLen)
{
UART_T* pUart;
pUart = ComToUart(_ucPort);
USART_TypeDef* Usart = pUart->uart;
if (Usart == USART1)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com1_buff, 256);
memcpy(send_com1_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&USART1_DMA_Handle_TX) == HAL_DMA_STATE_BUSY)//连续发送时后面加系统延时
{
return 1;
}
HAL_UART_Transmit_DMA(&Usart1Handle, send_com1_buff, _usLen);
}
if (Usart == USART2)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com2_buff, 256);
memcpy(send_com2_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&USART2_DMA_Handle_TX) == HAL_DMA_STATE_BUSY)//连续发送时后面加系统延时
{ return 2;
}
HAL_UART_Transmit_DMA(&Usart2Handle, send_com2_buff, _usLen);
/*for (i = 0; i < _usLen; i++)
{
HAL_UART_Transmit(&Usart2Handle, _ucaBuf++, 1, 1000);
}*/
}
if (Usart == USART3)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com3_buff, 256);
memcpy(send_com3_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&USART3_DMA_Handle_TX) != HAL_DMA_STATE_READY)//连续发送时后面加系统延时
{
return 3;
}
HAL_UART_Transmit_DMA(&Usart3Handle, send_com3_buff, _usLen);
}
if (Usart == UART4)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com4_buff, 256);
memcpy(send_com4_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&UART4_DMA_Handle_TX) == HAL_DMA_STATE_BUSY)//连续发送时后面加系统延时
{
return 4;
}
HAL_UART_Transmit_DMA(&Uart4Handle, send_com4_buff, _usLen);
}
if (Usart == USART6)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com6_buff, 256);
memcpy(send_com6_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&USART6_DMA_Handle_TX) == HAL_DMA_STATE_BUSY)//连续发送时后面加系统延时
{
return 6;
}
HAL_UART_Transmit_DMA(&Usart6Handle, send_com6_buff, _usLen);
}
if (Usart == UART8)
{
SCB_InvalidateDCache_by_Addr((uint32_t*)send_com8_buff, 256);
memcpy(send_com8_buff, _ucaBuf, _usLen);
if (HAL_DMA_GetState(&UART8_DMA_Handle_TX) == HAL_DMA_STATE_BUSY)//连续发送时后面加系统延时
{
bsp_DelayMS(1);//使用操作系统时，使用系统延时
return 8;
}
HAL_UART_Transmit_DMA(&Uart8Handle, send_com8_buff, _usLen);
}
}
return _usLen;
}
2、在线程中调佣发送函数
void task_check(void *argument)
{
const uint16_t usFrequency = 200; /* 延迟周期 */
uint32_t tick;
static unsigned int cnt = 0;
static int num = 0;
/* 获取当前时间 */
int i=0;
//my_file_opt_t msg;
while(1)
{
osDelay(TASK_IDLE_CHECK*10);
bsp_LedToggle(1);
/* 相对延迟 */
//tick += usFrequency;
//osDelayUntil(tick);
check_data_process();//自检信息处理
cnt ++;
if(cnt%25 == 0)
{
run_event_create(1,1,&test_log);
}
test_buf = 0x12;
test_buf = 0x23;
test_buf = 0x34;
test_buf = 0x45;
test_buf = 0x56;
test_buf = 0x67;
comSendBuf(COM3,test_buf,6);
comSendBuf(COM3,test_buf,6);
}
}
串口DMA发送前应该做Cache 的Clean操作，简单省事些，直接关闭AXI SRAM的Cache试试。 硬汉哥，可以了，串口DMA发送前使用了SCB_CleanDCache();,能正常发送了。
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