Why doesn't receiver-interrupt work on UART4 in this example when it works for USART1 and USART3? #define STARTUP_MSG "Test Rx-interrupt\n"
#include <stdio.h>
#include "stm32f4xx_hal.h"
#define get_RTC HAL_GetTick
#define LED_inv HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5)
#define LED_on HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET)
#define LED_off HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET)
void waitXms( uint32_t );
void USART1_IRQHandler( void );
void USART3_IRQHandler( void );
void UART4_IRQHandler( void );
void uart1_init( void );
void uart2_init( void );
void uart3_init( void );
void uart4_init( void );
UART_HandleTypeDef hU1, hU2, hU3, hU4;
/*---------------------------------------------------------------------------*/
/* UART1 Interrupt Service Routine */
void USART1_IRQHandler( void ) {
uint8_t uc;
uc = (&hU1)->Instance->DR; // Read data and clear flag
putchar( uc ); // Echo to debug-uart
LED_inv; // Toggle LED to check if program comes here
}
void uart1_init( void ) {
GPIO_InitTypeDef GPIO_Init
