未正确获取sim800响应

Question

我正在努力从与stm32f103连接的sim800L模块获得正确的响应(OK)。但是通过串行终端(使用USB连接串行模块)，一切(sms、电话、gprs)都工作得很好。

我得到了一系列的AAAAAAA......。我在关闭回声的情况下尝试了一下，但响应相同

也减少了超时。

下面是我的一段代码

#include "main.h"
#include "stdio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "string.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
unsigned char E[]={10},G[]={34},S[]={26},C[]={13};
#define SUB   HAL_UART_Transmit(&huart1,(unsigned char*)S,1,1000);

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart3;

/* USER CODE BEGIN PV */
unsigned char tx_buffer[50],rx_buffer[50]={'\0'};
uint8_t x=26;
char send_str[33]={'\0'};
char Num_str[11]={"xxxxxxxxxx"};
char    sending_sms_str[65] = {'\0'};
unsigned char msg_str[50]="good morning shubham";

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART3_UART_Init(void);
/* USER CODE BEGIN PFP */
void sim800_init(void);
void sim800_call(void);
void sim800_sms(void);
void sim800_gprs(void);

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/*
void sim800_response(void)
{
    char response[200];
    for(int i = 0 ; i<200 ; i++) 
    {
   response[i++] = HAL_UART_Receive(&huart1,(unsigned char *)rx_buffer,1,100);
    }
    HAL_Delay(200);
   HAL_UART_Transmit(&huart3,(unsigned char *)response,strlen(response),100);   
}
*/
void sim800_test(void)
{
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r",strlen("AT\r"),100);
    HAL_Delay(300);
    //HAL_UART_Transmit(&huart1,(uint8_t *) "AT+IPR=9600\\n" , strlen ("AT+IPR=9600\r\n"),100);
    //HAL_Delay(200);
    HAL_UART_Receive(&huart3,(uint8_t *)rx_buffer,sizeof(rx_buffer),100);
    HAL_Delay(200);
    //sim800_response();
    HAL_UART_Transmit(&huart1,(uint8_t *)rx_buffer,sizeof(rx_buffer),100);// to Uart1 for debugging the response
    
    HAL_Delay(200);
    rx_buffer[0] = '\0';
                                                                                                 
}   

void sim800_init(void)
{
    HAL_Delay(10000);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r\n",strlen("AT\r\n"),1000);
    HAL_Delay(500);
    
    //-----------------------------
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+IPR=9600\r\n",strlen("AT+IPR=9600\r\n"),1000);
    HAL_Delay(500);
}

void sim800_call(void) // working 
{
    char rxbuf[50];
    HAL_UART_Transmit(&huart3,(uint8_t *)"ATD xxxxxxxxxx;\r\n",strlen("ATD xxxxxxxxxx;\r\n"),1000);
    HAL_Delay(100);
    HAL_UART_Receive(&huart3,(uint8_t *)rxbuf,strlen(rxbuf),300);
    HAL_Delay(100);
    HAL_UART_Transmit(&huart1,(uint8_t *)rxbuf,strlen(rxbuf),300);//to Uart1 for debugging the response
    rxbuf[0]='\0';
    HAL_Delay(10000);
    HAL_UART_Transmit(&huart3,(uint8_t *)"ATH\r\n",strlen("ATH\r\n"),1000);
    HAL_Delay(100);
    HAL_UART_Receive(&huart3,(uint8_t *)rxbuf,strlen(rxbuf),300);
    HAL_Delay(100);
    HAL_UART_Transmit(&huart1,(uint8_t *)rxbuf,strlen(rxbuf),300);//to Uart1 for debugging the response
    rxbuf[0]='\0';
}

void sim800_sms(void)       // function 1 working
{
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CMGF=1\r\n",strlen("AT+CMGF=1\r\n"),1000);
    //HAL_Delay(500);
    //HAL_UART_Transmit(&huart1,(uint8_t *)"AT+CMGS=\"+91xxxxxxxxxx\"\r\n",strlen("AT+CMGS=\"+91xxxxxxxxxx\"\r\n"),1000);
    //HAL_Delay(500);
    //HAL_UART_Transmit(&huart1,(unsigned char *)"it is working",strlen("it is working"),1000);
    //HAL_Delay(500);
    //HAL_UART_Transmit(&huart1,(uint8_t *)&x,1,10);
    HAL_Delay(500);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CMGS=\"+91xxxxxxxxxxx\"\r\n",strlen("AT+CMGS=\"+91xxxxxxxxxx\"\r\n"),1000);
    HAL_Delay(500);
    HAL_UART_Transmit(&huart3,(unsigned char *)msg_str,strlen((const char *)msg_str),1000);
    HAL_Delay(500);
    HAL_UART_Transmit(&huart3,(uint8_t *)&x,1,10);
    HAL_Delay(5000);
}

void    send_sms(void)          // function 2 working 
{
    LED_GPIO_Port -> BRR = LED_Pin;
    send_str[0] = '\0';
    sprintf(send_str,"AT+CMGF=1\r\n");
    HAL_UART_Transmit(&huart3,(unsigned char *)send_str,strlen(send_str),1000);
    HAL_Delay(1000);
    send_str[0] = '\0';
    sprintf(send_str,"AT+CMGS=\"+91%s\"\r\n",Num_str);
    HAL_UART_Transmit(&huart3,(unsigned char *)send_str,strlen(send_str),1000);
    HAL_Delay(1000);
    sprintf(sending_sms_str,"HELLO\r\n");
    HAL_UART_Transmit(&huart3,(unsigned char *)sending_sms_str,strlen(sending_sms_str),1000);
    //HAL_Delay(10);
    //HAL_UART_Transmit(&huart1,(unsigned char*)S,1,1000);  // or SUB
    SUB
    HAL_Delay(1000);
    LED_GPIO_Port -> BSRR = LED_Pin;
}

void sim800_gprs(void)
{
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r\n",strlen("AT\r\n"),1000);
    HAL_Delay(300);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CIPSHUT\r\n",strlen("AT+CIPSHUT\r\n"),1000);
    HAL_Delay(300);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CIPMUX=0\r\n",strlen("AT+CIPMUX=0\r\n"),1000);
    HAL_Delay(300);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CGATT=1\r\n",strlen("AT+CGATT=1\r\n"),1000);
    HAL_Delay(300);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CSTT=\"www\",\"\",\"\"\r\n",strlen("AT+CSTT=\"www\",\"\",\"\"\r\n"),1000);
    HAL_Delay(2000);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CIICR\r\n",strlen("AT+CIICR\r\n"),5000);
    HAL_Delay(2000);
    HAL_UART_Transmit(&huart3,(uint8_t *)"AT+CIFSR\r\n",strlen("AT+CIFSR\r\n"),1000);
    HAL_Delay(1000);
    HAL_UART_Transmit(&huart1,(uint8_t *)"All cmd sent\r\n",strlen("All cmd sent\r\n"),1000);

}   
    

//---------------------------------------------------------------------//
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */


    
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_USART3_UART_Init();
  /* USER CODE BEGIN 2 */
    
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
        sim800_init();
        sim800_gprs();
        //sim800_call();
        //sim800_test();
        //sim800_init();
        //sim800_call();                            // working but reliability low
        //send_sms();           // working but reliability very low
        //  sim800_sms();       // working 
        //HAL_Delay(25000);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 9600;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

/**
  * @brief USART3 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART3_UART_Init(void)
{

  /* USER CODE BEGIN USART3_Init 0 */

  /* USER CODE END USART3_Init 0 */

  /* USER CODE BEGIN USART3_Init 1 */

  /* USER CODE END USART3_Init 1 */
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 9600;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART3_Init 2 */

  /* USER CODE END USART3_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : LED_Pin */
  GPIO_InitStruct.Pin = LED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif                                                          

Answer 1

我建议使用以下方法来调试您面临的问题：

1. 您需要确保您的UART代码工作正常，为此，您可以通过FTDI线将STM32连接到PC上的串行终端，并检查串行终端是否收到了从STM32发送的消息。
2. 一旦解决了步骤(1)，您需要检查SIM800模块是否正确供电(即:电源引脚正确且电流足够)。
3. 一旦解决了步骤(2)，请尝试通过FTDI线将SIM800连接到PC，并通过串行监视器发送和接收AT命令和响应。

返回到代码，这里有一些关于如何发送AT命令并等待其已知响应的简单示例：

使用Echo：

/* Wait at most 1000 ms for the command to be sent completely */
HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r", (sizeof("AT\r")-1), 1000);
/* Wait 5000 ms for response with echo */
HAL_UART_Receive(&huart3, (uint8_t *)rx_buffer, (sizeof("AT\r\r\nOK\r\n")-1), 5000);

没有回声：

/* Wait at most 1000 ms for the command to be sent completely */
HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r", (sizeof("AT\r")-1), 1000);
/* Wait 50000 ms for response without echo */
HAL_UART_Receive(&huart3, (uint8_t *)rx_buffer, (sizeof("\r\nOK\r\n")-1), 5000);

或者您可以通过UART接收回调异步完成此操作：

使用Echo：

/* Wait at most 1000 ms for the command to be sent completely */
HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r", (sizeof("AT\r")-1), 1000);
/* This will raise a callback when the response length is reached */
HAL_UART_Receive_IT(&huart3, (uint8_t *)rx_buffer, (sizeof("AT\r\r\nOK\r\n")-1));

没有回声：

/* Wait at most 1000 ms for the command to be sent completely */
HAL_UART_Transmit(&huart3,(uint8_t *)"AT\r", (sizeof("AT\r")-1), 1000);
/* This will raise a callback when the response length is reached */
HAL_UART_Receive_IT(&huart3, (uint8_t *)rx_buffer, (sizeof("\r\nOK\r\n")-1));

回调：

HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  if(huart->Instance == USART3)
  {
    /* if you are here then you received a response */
  }
}