Can't get UART Rx interrupt to work

[vneff]

I cannot get the RS232 Rx interrupt to work.
I am working with the stm3210c-eval board. I know it is no longer available; but it has a version of the processor that I wish to use and Ethernet support.
I am initiating the receive via:

HAL_UART_Receive_IT( &USART_TDP_Handle, &(USART_TDP_RxBuffer[0]), 1);

The call back function HAL_UART_RxCpltCallback(HAL_UART_RxCpltCallback) is simple:

USART_TDP_ring_Buffer[USART_TDP_ring_Rx_in++] = USART_TDP_RxBuffer[0];
HAL_UART_Receive_IT( &USART_TDP_Handle, &(USART_TDP_RxBuffer[0]), 1 );
BSP_LED_On(LED3);

So, if nothing else the LED should turn on when a byte is received. It does not. I have verified the LED works.
This is my initialization (not that STcubeMX did not initialize the UART Rx pin correctly):

__HAL_RCC_USART2_CLK_ENABLE();

USART_TDP_RX_GPIO_CLK_ENABLE();
USART_TDP_TX_GPIO_CLK_ENABLE();

__HAL_RCC_GPIOD_CLK_ENABLE();

/**USART2 GPIO Configuration
PD5 ------> USART2_TX
PD6 ------> USART2_RX
*/
GPIO_InitStruct.Pin = USART2_TX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

GPIO_InitStruct.Pin = USART2_RX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
//GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

__HAL_AFIO_REMAP_USART2_ENABLE();

/* NVIC for USART */
HAL_NVIC_SetPriority(USART2_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(USART2_IRQn);

Have I missed something? I have verified that the TTL Rx signal makes to the processor's UART2 Rx pin.

[Andrew Neil]

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@vneff wrote:

I cannot get the RS232 Rx interrupt to work.? 

---

Before going to interrupts, does polled receiving work?

[Saket_Om · Accepted solution]

Hello @vneff 

Did you implement the USART2_IRQHandler () function as shown below?

void USART2_IRQHandler(void)
{
  HAL_UART_IRQHandler(&UartHandle);
}

[vneff]

Andrew,

That was an excellent suggestion. That allowed me to prove that USART2 Rx pin was working.

Thank you.

[vneff]

Saket_Om,

That was the problem. Why would the STcube HAL not take of that? Is that a failure of STcubeMX?

[SofLit]

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@vneff wrote:

That was the problem. Why would the STcube HAL not take of that? Is that a failure of STcubeMX?

---

Did you activate the NVIC interrupt in CubeMx for USART2?

[vneff]

SofLit,

No i did not. I see that would be an issue for Ethernet as well.
If I check those 2, will that screw up my existing code?
STcubeMX does handle the assigned input pins for the STM32F107. Makes them outputs.

[SofLit]

So it's not a limitation as you didn't activate the NVIC in CubeMx.

To let CubeMx generate the IRQ handler you need to enable it in NVIC menu: