STM32F4, HAL Lib, USART IRQ

[tommaso]

Posted on February 10, 2016 at 09:40

Hi all,

I'm working with STM32F4 mcu and keil uVision 5 IDE. I'm tryng to configure RS232 periph. but I have a problem. Transmission works fine but I'm not able to receive interrupt when something is received. Here my code:

/** Init Rs232 port

*/

void init_RS232(void){

GPIO_InitTypeDef GPIO_InitStruct;


/* GPIO Ports Clock Enable */

__GPIOC_CLK_ENABLE();

__USART3_CLK_ENABLE();


/**USART3 GPIO Configuration

PC10 ------> USART2_TX

PC11 ------> USART2_RX

*/


/*Configure GPIO pin : RS232 Pin */

GPIO_InitStruct.Pin = GPIO_PIN_10 | GPIO_PIN_11; 

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

GPIO_InitStruct.Pull = GPIO_NOPULL;

GPIO_InitStruct.Speed = GPIO_SPEED_LOW;

GPIO_InitStruct.Alternate = GPIO_AF7_USART3;

HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);


/* Configure USART3 parameters */ 

USART3_Handle.Instance = USART3;

USART3_Handle.Init.BaudRate = 9600;

USART3_Handle.Init.Mode = USART_MODE_TX_RX;

USART3_Handle.Init.Parity = USART_PARITY_NONE;

USART3_Handle.Init.StopBits = USART_STOPBITS_1;

USART3_Handle.Init.WordLength = USART_WORDLENGTH_8B;

HAL_USART_Init(&USART3_Handle);



HAL_USART_Receive_IT(&USART3_Handle, rx_buffer, 16); 

HAL_NVIC_SetPriority(USART3_IRQn, 3, 0);

HAL_NVIC_EnableIRQ(USART3_IRQn); 

}

I would to receive an interrupt every time a char is received and I would like to manage by myself the buffer. With old lib (standard periph lib) I was able to do this. With new HAL ones not. Can you help me? Thanks a lot.

[pratik]

Posted on February 10, 2016 at 10:52

Hi, 

try setting priority and enabling interrupt before calling ''

HAL_USART_Receive_IT

''

[tommaso]

Posted on February 10, 2016 at 12:21

Hi,

I've tried your suggestion but it doesn't work. When I enable IRQ the transmission doesn't work too. The code fall continously in USART3_IRQHandler.

[tommaso]

Posted on February 10, 2016 at 16:43

Have anyone an example for this problem?

[Tesla DeLorean]

Posted on February 10, 2016 at 17:05

Doesn't HAL/Cube have a load of examples it installs?

[Amel NASRI]

Posted on February 10, 2016 at 17:06

Hi crazy_code,

In the STM32CubeF4 package, there are several examples for USART/UART based on interrupt mode (Ex:STM32Cube_FW_F4_V1.11.0\Projects\STM32F4-Discovery\Examples\UART\UART_TwoBoards_ComIT).

You may take them as start point to develop your own application.

You can also generate your initialization code based on CubeMX, did you tried it?

-Mayla-

[tommaso]

Posted on February 10, 2016 at 17:17

Hi Mayla,

can you explain me how to generate an example that uses UART and interrupt?

I open CubeMX, select New Project, selct my mcu, add UART to periph and check NVIC global interrupt but in the code I cannot find IRQ configuration,

Thanks a lot.

[Amel NASRI]

Posted on February 10, 2016 at 17:51

You will find it in the file stm32f4xx_hal_msp.c.

-Mayla-

[tommaso]

Posted on February 12, 2016 at 14:56

Hi,

UART now works. I can transmit and receive in polling. I still have sompe problem with receive interrupt. I receive only first interrupt. Following ones are not detected. Here my code:

void USART3_IRQHandler(void){
HAL_NVIC_ClearPendingIRQ(USART3_IRQn);
HAL_UART_IRQHandler(&USART3_Handle);
}

What's wrong?

[tommaso]

Posted on February 16, 2016 at 15:48

Can anyone tell me if my IRQ handler is correct?

Thanks.

[Amel NASRI]

Posted on February 18, 2016 at 10:48

Hi crazy_code,

There is no need to call 

HAL_NVIC_ClearPendingIRQ in the IRQ handler.

-Mayla-