Command Line Interface - CLI via UART

前言

製作一個UART的CLI模版，這只是一個最基本的架構，功能會依需求持續修改

---

操作環境

• Board：32F072BDISCOVERY
• IDE：STM32CubeIDE
• Code：STM32CubeMX

MCU I/O配置

• UART：TX(PA9)，RX(PA10)

1. STM32CubeMX

勾選USART1，選 Asynchronous，bardrate:115200 bps

這裡的USART1不是公板上內建的介面，須要另外搭配UART模組

勾選中斷功能

2. STM32CubeIDE

在main.c加入下列程式

main.c

/* USER CODE BEGIN Includes */
#include <stdio.h>
#include <string.h>
/* USER CODE END Includes */

完善 printf 指令

/* USER CODE BEGIN PV */
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
   set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, HAL_MAX_DELAY);
  return ch;
}
/* USER CODE END PV */

CLI函式所需用到的變數 buffer

/* USER CODE BEGIN PFP */
uint8_t uart_rx[2];
char	cli_data[80];
char 	*cli_pointer = cli_data;
uint8_t	cli_key_enter;
/* USER CODE END PFP */

CLI函式

/* USER CODE BEGIN 0 */
void CLI(void)
{
	uint8_t values[10];
	uint8_t i = 0;
	char *token;
//	extern USBD_HandleTypeDef hUsbDeviceFS;

	if(cli_key_enter != 1) return;
	cli_key_enter = 0;

	token = strtok(cli_data, " ");
//    while (token != NULL) {
//        //printf("%s\n", token);
//        token = strtok(NULL, " ");
//    }
	while(token != NULL)
	{
		//values[i++] = atoi( token );
		values[i++] = strtol(token, NULL, 16);
		token = strtok(NULL, " ");
	}

	if(i>0)
	{
//		USBD_HID_SendReport(&hUsbDeviceFS,values, i);
//		HAL_Delay(15);
//		memset(values, 0, i);
//		USBD_HID_SendReport(&hUsbDeviceFS,values, i);
//		HAL_Delay(15);
	}else{
		printf("--- CLI console ---\n\r");
		printf("Key in multi hex values A0 00 10 and press ENTER to execute\n\r");
		printf("-------------------\n\r");
		printf("\n");
	}
	cli_pointer = cli_data;
	memset(cli_data, 0, sizeof(cli_data));
}
/* USER CODE END 0 */

main loop

UART的中斷接收 HAL_UART_Receive_IT 要先執行一次

int main(void)
{
  /* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, uart_rx, 1);
  printf("Halo CLI\r\n");
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
	CLI();
  }
  /* USER CODE END 3 */
}

UART接收中斷程序

/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	HAL_UART_Receive_IT(&huart1, uart_rx, 1);
	HAL_UART_Transmit(&huart1, uart_rx, 1, HAL_MAX_DELAY);

	switch(uart_rx[0])
	{
	case '\r'://"Enter 0x13"
		printf("\n");
		cli_key_enter = 1;
		break;
	case 0x7F://"backspace"
		if(cli_pointer > cli_data) cli_pointer--;
		break;
	case 0x1B://"ESC"
		cli_pointer = cli_data;
		printf("\r");
		break;
	default:
		if((cli_pointer - cli_data) >=80) cli_pointer = cli_data;
		*(cli_pointer++) = (char)uart_rx[0];
		break;
	}
//	int size = (cli_pointer) - (cli_data);
}
/* USER CODE END 4 */

---

3. 成果

上電後先列印出"Halo CLI"

在沒有任何輸入時按下 Enter 則顯示CLI內容

可以輸入16進制的數值；但沒有任何功能