[BluePill+] problem with USART interrups

[trimarco232]

Hi,
in my current project , I am dealing with RS485 , on my way. I am writing directly into the registers , in order to know exactly what I am doing , and what happens
The problem here is that after receiving a byte , the program stops ; I don't now if it is just before it enters the ISR (USART3_IRQHandler) ,or later .
I have put the same code in CubeIDE , it works , so I wonder what happens in STM32duino ? Thanks !
(my skills to debug in STM32duino are limited because of the terrible each time to compile)

Code: Select all

/* rs.h x : rs485 on usart3 /* ua_rt.h */

#define DE485 PB12

void usart3_setup() {

  RCC->APB1ENR |= RCC_APB1ENR_USART3EN;  // Enable clock

  // Configure PB10 (TX) and PB11 (RX)
  GPIOB->CRH &= ~(GPIO_CRH_CNF10 | GPIO_CRH_MODE10 | GPIO_CRH_CNF11 | GPIO_CRH_MODE11);  /// pas nécessaire ...
  GPIOB->CRH |= (GPIO_CRH_CNF10_1 | GPIO_CRH_MODE10_0 | GPIO_CRH_CNF11_0);               // alternate PP // input ... PU

  // Configure USART3
  USART3->BRR = 72000000 / 2 / 57600;                            // 57600 baud rate , APB1 is CLK/2
  USART3->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;  // Enable TX and RX  // Enable RXNE interrupt
  USART3->CR1 |= USART_CR1_UE;                                   // Enable USART
  NVIC_EnableIRQ(USART3_IRQn);

  pinMode(DE485, OUTPUT);
}

void USART3_IRQHandler(void) {
  uint16_t data = USART3->DR;
   Serial.print("USART3->DR:");
  Serial.println(data);
}

[fpiSTM]

Code: Select all

extern "C" void USART3_IRQHandler(void)

And avoid print in ISR.

[trimarco232]

thanks ,
I tried it but got : (.text.USART3_IRQHandler+0x0): multiple definition of `USART3_IRQHandler';
(ok to avoid to print in ISR)

[fpiSTM]

That is normal. The handler is already defined for the serial. You have to comment it in the core if you want use Serial. Else you can define the HAL_UART_MODULE_ONLY but Serial instance will be disabled.

https://github.com/stm32duino/Arduino_C ... odule-only