[活动专区] 【AT-START-F423测评】+串口printf

#include "stdio.h"

#include "at32f423.h"

#include "usart/usart.h"



/* support printf function, usemicrolib is unnecessary */

#if (__ARMCC_VERSION > 6000000)

  __asm (".global __use_no_semihosting\n\t");

  void _sys_exit(int x)

  {

    x = x;

  }

  /* __use_no_semihosting was requested, but _ttywrch was */

  void _ttywrch(int ch)

  {

    ch = ch;

  }

  FILE __stdout;

#else

 #ifdef __CC_ARM

  #pragma import(__use_no_semihosting)

  struct __FILE

  {

    int handle;

  };

  FILE __stdout;

  void _sys_exit(int x)

  {

    x = x;

  }

  /* __use_no_semihosting was requested, but _ttywrch was */

  void _ttywrch(int ch)

  {

    ch = ch;

  }

 #endif

#endif



#if defined (__GNUC__) && !defined (__clang__)

  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  retargets the c library printf function to the usart.

  * @param  none

  * @retval none

  */

PUTCHAR_PROTOTYPE

{

  while(usart_flag_get(USART1, USART_TDBE_FLAG) == RESET);

  usart_data_transmit(USART1, (uint16_t)ch);

  while(usart_flag_get(USART1, USART_TDC_FLAG) == RESET);

  return ch;

}



#if (defined (__GNUC__) && !defined (__clang__)) || (defined (__ICCARM__))

#if defined (__GNUC__) && !defined (__clang__)

int _write(int fd, char *pbuffer, int size)

#elif defined ( __ICCARM__ )

#pragma module_name = "?__write"

int __write(int fd, char *pbuffer, int size)

#endif

{

  for(int i = 0; i < size; i ++)

  {

    while(usart_flag_get(PRINT_UART, USART_TDBE_FLAG) == RESET);

    usart_data_transmit(PRINT_UART, (uint16_t)(*pbuffer++));

    while(usart_flag_get(PRINT_UART, USART_TDC_FLAG) == RESET);

  }



  return size;

}

#endif





void init_usart(uint32_t baudrate)

{

        gpio_init_type gpio_init_struct;



#if defined (__GNUC__) && !defined (__clang__)

  setvbuf(stdout, NULL, _IONBF, 0);

#endif



  /* enable the uart and gpio clock */

  crm_periph_clock_enable(USART1_CLOCK, TRUE);

  crm_periph_clock_enable(USART1_GPIO_CLOCK, TRUE);



  gpio_default_para_init(&gpio_init_struct);



  /* configure the uart tx pin */

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

  gpio_init_struct.gpio_out_type  = GPIO_OUTPUT_PUSH_PULL;

  gpio_init_struct.gpio_mode = GPIO_MODE_MUX;

  gpio_init_struct.gpio_pins = USART1_TX_PIN;

  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;

  gpio_init(USART1_GPIO, &gpio_init_struct);



  gpio_pin_mux_config(USART1_GPIO, USART1_TX_PIN_SOURCE, USART1_TX_PIN_MUX_NUM);



  /* configure uart param */

  usart_init(USART1, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);

  usart_transmitter_enable(USART1, TRUE);

  usart_enable(USART1, TRUE);

}

#ifndef _USART_H

#define _USART_H



#define USART1_CLOCK                        CRM_USART1_PERIPH_CLOCK

#define USART1_TX_PIN                GPIO_PINS_9

#define USART1_GPIO                  GPIOA

#define USART1_GPIO_CLOCK                  CRM_GPIOA_PERIPH_CLOCK

#define USART1_TX_PIN_SOURCE         GPIO_PINS_SOURCE9

#define USART1_TX_PIN_MUX_NUM        GPIO_MUX_7



void init_usart(uint32_t baudrate);



#endif

#include "at32f423_board.h"

#include "at32f423_clock.h"

#include "led/led.h"

#include "key/key.h"

#include "usart/usart.h"



int main(void)

{

  system_clock_config();



  at32_board_init();

        init_led();

        init_key();

        init_usart(115200);



  while(1)

  {

    led2_tog();

    delay_ms(200);

    led3_tog();

    delay_ms(200);

    led4_tog();

    delay_ms(200);

                printf("AT32F423 USART1 TEST! \r\n");

  }

}