STM32 GNU MCU Eclipse - Giao tiếp USART

/**
 * GNU MCU Eclipse project example for USART STM32F4 Discovery
 * @author    nvtienanh
 * @email     nvtienanh@gmail.com
 * @website   https://bmshop.vn
 * @ide       GNU MCU Eclipse
 */
/* Include core modules */
#include #include #include "diag/Trace.h"
#include "stm32fxxx_hal.h"
#include "defines.h"
#include "stm32_disco.h"
#include "stm32_delay.h"
#include "stm32_general.h"
#include "stm32_usart.h"

// ----- main() ---------------------------------------------------------------

// Sample pragmas to cope with warnings. Please note the related line at
// the end of this function, used to pop the compiler diagnostics status.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wmissing-declarations"
#pragma GCC diagnostic ignored "-Wreturn-type"

char mesg[20];
int main(int argc, char* argv[])
{

	/* Init system clock for maximum system speed */
	RCC_InitSystem();
	/* Init HAL layer */
	HAL_Init();
	/* Initialize delay */
	DELAY_Init();
	/* Initialize leds on board */
	DISCO_LedInit();
	/* Init button */
	DISCO_ButtonInit();
	/* Init USART6, TX: PC6, 9600 baud */
	USART_Init(USART6, USART_PinsPack_1, 115200);

#ifdef TRACE
        trace_printf("System reset source: %d\n", (uint8_t)GENERAL_GetResetSource(1));
        trace_printf("System core clock: %u Hz; PCLK1 clock: %u Hz\n",
            	GENERAL_GetClockSpeed(GENERAL_Clock_SYSCLK),
            	GENERAL_GetClockSpeed(GENERAL_Clock_PCLK1));
#endif

#ifdef NDEBUG
    /* Get system reset source and clear flags after read */
    /* You should see number which corresponds to "None", because we cleared flags in statement above */
    sprintf(mesg,"System reset source: %d\n", (uint8_t)GENERAL_GetResetSource(1));
    USART_Puts(USART6, mesg);
    /* Get system core and PCLK1 (Peripheral Clock 1, APB1) clocks */
    sprintf(mesg,"System core clock: %u Hz; PCLK1 clock: %u Hz\n",
    	GENERAL_GetClockSpeed(GENERAL_Clock_SYSCLK),
    	GENERAL_GetClockSpeed(GENERAL_Clock_PCLK1)
    );
    USART_Puts(USART6, mesg);
#endif
	while (1)
	{
		/* If button pressed */
		if (DISCO_ButtonOnPressed())
		{
			DISCO_LedOn(LED_ALL);
#ifdef TRACE
			trace_printf("Button is pressed ...\n");
#endif

#ifdef NDEBUG
			/* Send to USER */
			sprintf(mesg,"Button is pressed ...\n");
			USART_Puts(USART6, mesg);
#endif
			/* Wait a little */
			Delayms(500);
			/* Perform system software reset */
			GENERAL_SystemReset();
		}
	}
}

#pragma GCC diagnostic pop

// ----------------------------------------------------------------------------