|
调用函数1:HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)
这个函数,这个超时设置如何设置?
是不是需要接收的数据越多,超时设置就的越大?
超时函数时每次接收一个数据都会调用以下的函数:而下面的函数里的Tickstart参数是在进while循环的之前的,也就是说,接收的数据越多,HAL_GetTick() - Tickstart 这个值就越大
HAL_StatusTypeDef UART_WaitOnFlagUntilTimeout(UART_HandleTypeDef *huart, uint32_t Flag, FlagStatus Status,
uint32_t Tickstart, uint32_t Timeout)
HAL_StatusTypeDef UART_WaitOnFlagUntilTimeout(UART_HandleTypeDef *huart, uint32_t Flag, FlagStatus Status,
uint32_t Tickstart, uint32_t Timeout)
{
/* Wait until flag is set */
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_0,GPIO_PIN_SET);
gTickstart = Tickstart;
while ((__HAL_UART_GET_FLAG(huart, Flag) ? SET : RESET) == Status)
{
/* Check for the Timeout */
if (Timeout != HAL_MAX_DELAY)
{
if (((HAL_GetTick() - Tickstart) > Timeout) || (Timeout == 0U))
{
gNTickstart = HAL_GetTick();
/* Disable TXE, RXNE, PE and ERR (Frame error, noise error, overrun error)
interrupts for the interrupt process */
CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE));
CLEAR_BIT(huart->Instance->CR3, USART_CR3_EIE);
huart->gState = HAL_UART_STATE_READY;
huart->RxState = HAL_UART_STATE_READY;
__HAL_UNLOCK(huart);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_0,GPIO_PIN_RESET);
return HAL_TIMEOUT;
}
if (READ_BIT(huart->Instance->CR1, USART_CR1_RE) != 0U)
{
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_RTOF) == SET)
{
/* Clear Receiver Timeout flag*/
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_RTOF);
/* Disable TXE, RXNE, PE and ERR (Frame error, noise error, overrun error)
interrupts for the interrupt process */
CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE));
CLEAR_BIT(huart->Instance->CR3, USART_CR3_EIE);
huart->gState = HAL_UART_STATE_READY;
huart->RxState = HAL_UART_STATE_READY;
huart->ErrorCode = HAL_UART_ERROR_RTO;
/* Process Unlocked */
__HAL_UNLOCK(huart);
return HAL_TIMEOUT;
}
}
}
}
gNTickstart1 = HAL_GetTick();
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_0,GPIO_PIN_RESET);
return HAL_OK;
}
|
-
-
|