/*!
    \file    main.c
    \brief   led spark with systick, USART print and key example

    \version 2024-02-22, V2.1.0, firmware for GD32E23x
*/
#include "main.h"

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    /* configure systick */
    systick_config();
    /* configure USART */
    rs485_config();
    /* configure LED */
    led_blink_config();
    /* configure FWDGT */
    watchdog_init();

    printf("system start!\r\n");

    while(1){
        printf("hello world!\r\n");
        delay_ms(500);

        watchdog_reload();
    }
}

/* retarget the C library printf function to the USART */
int _write(int fd, char *pBuffer, int size) {
    for (int i = 0; i < size; i++) {
        usart_data_transmit(USART0, (uint8_t) pBuffer[i]);
        while (RESET == usart_flag_get(USART0, USART_FLAG_TBE));
    }
    return size;
}