【GD32评测】四、串口

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楼主

Cjy_JDxy|

楼主 | 2020-4-29 19:50 | 只看该作者 |只看大图回帖奖励

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串口, pi, IO, GPIO, gp

今晚搞了一下串口。
原理图：

代码：
#include "gd32e23x.h"
#include "gd32e231c_start.h"
#include "systick.h"
#include <stdio.h>

#define uchar unsigned char
#define uint unsigned int

void led_flash(int times);

//-----------------------------------------------------------------------------------------
//????:Delay()
//? ?:?????
//-----------------------------------------------------------------------------------------
void Delay(unsigned char us)  //5,7,9
{
  while(--us);
}

/*!
\brief    main function
\param[in]  none
\param[out] none
\retval    none
*/
int main(void)
{
/* initialize KEY and LED, configure SysTick */
gd_eval_key_init(KEY_WAKEUP, KEY_MODE_GPIO);
systick_config();
gd_eval_led_init(LED1);

/* flash the LED for test */
led_flash(1);
delay_1ms(500);
gd_eval_led_on(LED1);

rcu_periph_clock_enable(RCU_GPIOA);
/* configure led GPIO port */
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_9);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_9);
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_9);
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_10);
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_10);

rcu_periph_clock_enable(RCU_USART0);
usart_deinit(USART0);
usart_baudrate_set(USART0,115200);
usart_parity_config(USART0,USART_PM_NONE);
usart_word_length_set(USART0,USART_WL_8BIT);
usart_stop_bit_set(USART0,USART_STB_1BIT);

usart_transmit_config(USART0,USART_TRANSMIT_ENABLE);
usart_data_first_config(USART0,USART_MSBF_LSB);
usart_enable(USART0);

while(1)
{

usart_data_transmit(USART0,0xaa);
while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
delay_1ms(500);
}
}

/*!
\brief    flash the LED for test
\param[in]  times: times to flash the LEDs
\param[out] none
\retval    none
*/
void led_flash(int times)
{
int i;
for (i = 0;i < times;i++){
      /* delay 500 ms */
      delay_1ms(500);
      /* toggle the LEDs */
      gd_eval_led_toggle(LED1);

      /* delay 500 ms */
      delay_1ms(500);
      /* toggle the LEDs */
      gd_eval_led_toggle(LED1);
}
}

效果图：