changes 2

SDPMcu/Core/Src/main.c

@@ -18,6 +18,7 @@
 /* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "main.h"
+#include "cJSON.h"
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
@@ -47,13 +48,10 @@ __IO uint32_t BspButtonState = BUTTON_RELEASED;
 UART_HandleTypeDef huart1;
 
 /* USER CODE BEGIN PV */
-uint8_t tx_buffer[27] = "Welcome to BinaryUpdates!\n\r";
-uint8_t rx_indx;
-uint8_t rx_data[6];
-
-uint8_t rx_buffer[100];
-uint8_t transfer_cplt;
-
+uint8_t rx_data[1];  // Receive data one byte at a time
+uint8_t rx_buffer[202];  // Buffer to accumulate the incoming message
+uint8_t rx_index = 0;    // Index to track buffer position
+int message_received = 0;
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -106,7 +104,7 @@ int main(void)
   /* Initialize leds */
   BSP_LED_Init(LED_GREEN);
 
-  /* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed.*/
+  /* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed. */
   BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
 
   /* Initialize COM1 port (115200, 8 bits (7-bit data + 1 stop bit), no parity */
@@ -123,7 +121,6 @@ int main(void)
   /* USER CODE BEGIN BSP */
 
   /* -- Sample board code to send message over COM1 port ---- */
-  printf("Welcome to STM32 world !\n\r");
 
   /* -- Sample board code to switch on leds ---- */
   BSP_LED_On(LED_GREEN);
@@ -134,23 +131,51 @@ int main(void)
   /* USER CODE BEGIN WHILE */
   while (1)
   {
-//	  HAL_UART_Transmit(&huart1, tx_buffer, 27, 100);
-//	  HAL_Delay(1000);
-    /* -- Sample board code for User push-button in interrupt mode ---- */
-	 HAL_UART_Receive_IT(&huart1, rx_data, 6);
-
+    // Start receiving UART data byte by byte
+    HAL_UART_Receive_IT(&huart1, rx_data, 1);
+    if (message_received){
+    	printf("%s\n",rx_buffer);
+    	cJSON *json = cJSON_Parse((char *)rx_buffer);
+    	if (json == NULL)  // Check if the parsing failed
+    	        {
+    	            printf("Error parsing JSON\n");
+    	        }
+    	        else
+    	        {
+    	                    // Iterate over the JSON object and print out each key-value pair
+    	                    cJSON *item = NULL;
+    	                    cJSON_ArrayForEach(item, json)  // Loop through each item in the JSON object
+    	                    {
+    	                        // Get the key (the numbered key in your JSON)
+    	                        const char *key = item->string;
+    	                        // Check if the value is a string
+    	                        if (cJSON_IsString(item) && (item->valuestring != NULL))
+    	                        {
+    	                            // Print the key (pin number) and its value (state)
+    	                            printf("Pin %s: %s\n", key, item->valuestring);
+    	                        }
+    	                    }
+
+
+    	            // Always delete the JSON object to avoid memory leaks
+    	            cJSON_Delete(json);
+    	        }
+    	        // Clear the flag for the next message
+    	 message_received = 0;
+    }
     if (BspButtonState == BUTTON_PRESSED)
     {
       /* Update button state */
       BspButtonState = BUTTON_RELEASED;
       /* -- Sample board code to toggle leds ---- */
-      BSP_LED_Toggle(LED_GREEN);
+//      BSP_LED_Toggle(LED_GREEN)
       /* ..... Perform your action ..... */
     }
 
-    /* USER CODE END WHILE */
 
+    /* USER CODE END WHILE */
     /* USER CODE BEGIN 3 */
+
   }
   /* USER CODE END 3 */
 }
@@ -257,21 +282,43 @@ static void MX_GPIO_Init(void)
 }
 
 /* USER CODE BEGIN 4 */
+int _write(int file, char *ptr, int len) {
+    HAL_UART_Transmit(&huart1, (uint8_t*)ptr, len, HAL_MAX_DELAY);
+    return len;
+}
+
 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 {
   /* Prevent unused argument(s) compilation warning */
   UNUSED(huart);
 
-  /* NOTE : This function should not be modified, when the callback is needed,
-            the HAL_UART_RxCpltCallback can be implemented in the user file.
-   */
-  uint8_t response[]= "Received!\n";
-  HAL_UART_Transmit(&huart1,response, sizeof(response)-1, 10);
+  if (huart->Instance == USART1)  // Check if the interrupt is for UART1
+  {
+    // If received character is not newline, accumulate it in the buffer
+    if (rx_data[0] != '\n')
+    {
+      rx_buffer[rx_index++] = rx_data[0];  // Store received byte in buffer
+      if (rx_index >= sizeof(rx_buffer))   // Prevent buffer overflow
+      {
+        rx_index = 0;  // Reset index if the buffer is full
+      }
+    }
+    else
+    {
+      // When newline character is received, complete the message and reset buffer
+      rx_buffer[rx_index] = '\0';  // Null-terminate the string
+      message_received =1;
+      rx_index = 0;  // Reset the buffer index for the next message
+    }
+
+    // Continue receiving next byte
+    HAL_UART_Receive_IT(&huart1, rx_data, 1);
+  }
 }
 /* USER CODE END 4 */
 
 /**
-  * @brief  BSP Push Button callback
+  * @brief     BSP Push Button callback
   * @param  Button Specifies the pressed button
   * @retval None
   */