【AT-START-L021测评】一行代码搞定串口打印

uart_print_init(115200);

/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  initialize uart

  * @param  baudrate: uart baudrate

  * @retval none

  */

void uart_print_init(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(PRINT_UART_CRM_CLK, TRUE);

  crm_periph_clock_enable(PRINT_UART_TX_GPIO_CRM_CLK, 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 = PRINT_UART_TX_PIN;

  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;

  gpio_init(PRINT_UART_TX_GPIO, &gpio_init_struct);



  gpio_pin_mux_config(PRINT_UART_TX_GPIO, PRINT_UART_TX_PIN_SOURCE, PRINT_UART_TX_PIN_MUX_NUM);



  /* configure uart param */

  usart_init(PRINT_UART, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);

  usart_transmitter_enable(PRINT_UART, TRUE);

  usart_enable(PRINT_UART, TRUE);

}

**

  * @}

  */

/* Scans for I2C client devices on the bus - that have an address within the 

 *specified range [addr_min, addr_max]

 */

void simple_i2c_scan(uint8_t addr_min, uint8_t addr_max) {

  uint8_t client_address;

  uint8_t client_addr_str[5] = { 0 };

  static uint8_t IIC_Client_Num = 0;

  printf("\r\n I2C Scan started from 0x%02X to 0x%02X:", addr_min, addr_max);

  //LCD_ShowString(0,35,"I2C Client:",RED,WHITE,12,0);

  for (client_address = addr_min; client_address <= addr_max; client_address++) {

    printf("\r\n Scanning client address = 0x%02X", (int)client_address);



    /* start the request reception process */



    //I2C_Send7bitAddress(I2C1, client_address, I2C_Direction_Transmitter);

    if ((i2c_status = i2c_master_transmit(&hi2cx, client_address, &client_address, 1, I2C_TIMEOUT)) == I2C_OK) {

      printf("\r\n---- --> client (0x%02X) ACKED <-- ------ ", (int)client_address);

      client_addr_str[0] = '0';

      client_addr_str[1] = 'x';

      if (client_address / 16 >= 10)

        client_addr_str[2] = client_address / 16 - 10 + 'A';

      else

        client_addr_str[2] = client_address / 16 + '0';

      if (client_address % 16 >= 10)

        client_addr_str[3] = client_address % 16 - 10 + 'A';

      else

        client_addr_str[3] = client_address % 16 + '0';

      client_addr_str[4] = '\0';

      IIC_Client_Num++;



      printf("Yes, I2C Device found. Device Addr: %s", client_addr_str);

    } else {

      continue;

    }



    delay_ms(50);

  }  //<--for--loop>

  printf("\r\n ----------------- I2C Scan ended -----------------");

}