You can disable/enable ALL interrupts, including this UART7_IRQHandler()
, using these ARM-core CMSIS calls:
__disable_irq();
__enable_irq();
Source: https://stm32f4-discovery.net/2015/06/how-to-properly-enabledisable-interrupts-in-arm-cortex-m/
So, you could do the following to disable the interrupt, reset the RxState
, and then start up the interrupt-based receive again when ready:
__disable_irq();
huart7->RxState= HAL_UART_STATE_READY;
__enable_irq();
HAL_UART_Receive_IT(&huart7, (uint8_t *)rx_buffer, expectedNumberOfBytes);
You can disable/enable ONLY the UART7_IRQHandler()
interrupts (all 10 types of uart7 interrupts connected to this interrupt vector, including Tx-related, Rx-related, error-related, etc), using these STM32 HAL calls:
HAL_NVIC_DisableIRQ(UART7_IRQn);
HAL_NVIC_EnableIRQ(UART7_IRQn);
Then, do the same as just above except use these calls to disable/enable the interrupts instead.
If you dig down into the implementation of HAL_UART_IRQHandler()
, however, which is called by UART7_IRQHandler()
, you'll see that it only calls the interrupt-based receive handler, UART_Receive_IT()
, if both the USART_SR_RXNE
bit ("Receive Not Empty", inside the USART Status Register) and the USART_CR1_RXNEIE
bit ("Receive Not Empty Interrupt Enable", inside the USART Control Register 1), are both set. The RXNE
bit is set whenever a byte comes in, and is cleared whenever you read the data register or write a zero to it. The interrupt-enable bit is something you have full control over to disable this UART receive interrupt, and if you clear this bit manually, you will disable the receive interrupt withOUT disabling any other type of interrupt associated with this USART. This is the best way to do it, as there are 10 interrupt sources associated with this UART. In other words, clearing this bit not only causes the check inside HAL_UART_IRQHandler()
to fail, but it also prevents the receive interrupt from happening in the first place! Refer to the Reference Manual RM0090 Rev 16, for example:
p969:
p1009:
p1011:
p1015:
p1013:
So, to disable/enable the USART Receive Not Empty interrupt only, do the following. Refer to the Control Register (USART_CR1) on p1013, shown just above.
// Disable the USART Receive Not Empty interrupt
CLEAR_BIT(huart7.Instance.CR1, USART_CR1_RXNEIE);
// Enable the USART Receive Not Empty interrupt
SET_BIT(huart7.Instance.CR1, USART_CR1_RXNEIE);
Now, you could do the following to disable the USART Receive interrupt, reset the HAL RxState, and then start up the interrupt-based receive again when ready:
CLEAR_BIT(huart7.Instance.CR1, USART_CR1_RXNEIE);
huart7->RxState= HAL_UART_STATE_READY;
SET_BIT(huart7.Instance.CR1, USART_CR1_RXNEIE); // This call isn't actually necessary, as this bit is set inside `HAL_UART_Receive_IT()` as well
HAL_UART_Receive_IT(&huart7, (uint8_t *)rx_buffer, expectedNumberOfBytes);
HAL_UART_Receive_IT
是一个驱动程序函数,而不是中断处理程序。它为接收驱动程序设置状态。UART外设具有其自己的中断状态,但这与软件驱动程序内部的状态不同,这似乎是你卡住的地方。所以我认为你要问的是“如何重置STM32 HAL UART驱动程序状态?”如果这不是你的意思,而你想重置外设(UART硬件)状态,或者你想重置中断处理(NVIC硬件)状态,请编辑你的问题以明确这一点。 - Ben Voigt