WRITING TO FLASH WITH UART

[UUrcan]

Hi everyone,

I can write to flash of STM32F103, max value of uint32 variable 4294967294.

It is possible to write when you write it to flash directly.

But I want to write it to flash with uart receiving. But when I put the rows (which is writed Bold in codes) for receiving uart then it gives different value.

I am sharing my codes below. Could you please check it where or what is wrong with my codes?

Thanks and regards

uint32_t RxData;

uint32_t TxData;

char UartRxData[10]="4294967294";

char data[10];

 /* Initialize all configured peripherals */

 MX_GPIO_Init();

 MX_USART2_UART_Init();

 /* USER CODE BEGIN 2 */

 Flash_Write( 0x08007C00, 4294967294);

 HAL_Delay(50);

 /* USER CODE END 2 */

 /* Infinite loop */

 /* USER CODE BEGIN WHILE */

 while (1)

 {

  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */

 HAL_UART_Receive_IT(&huart2, (uint8_t*)&UartRxData, strlen(UartRxData)); //activate UART receive interrupt every time

 

unsigned long val = atoi(UartRxData);

 Flash_Write(0x08007C00, val);

 RxData = Flash_Read(0x08007C00);

 sprintf(data, " %lu", RxData);

 HAL_UART_Transmit(&huart2, (uint8_t*)&data, strlen(data), 1000);

 HAL_Delay(50);

 }

 /* USER CODE END 3 */

}

[Tesla DeLorean]

Writing to FLASH operates independently of the source of the data

[UUrcan]

Sure. Writing operation is done independently. I do not have any problem with writing operation. I want to get variable value from UART and also want it to write to the flash.

[Tesla DeLorean]

Your initial post was devoid of any content.

You can only write to a Flash location once after you erase it.

Your HAL_UART_Receive_IT() code falls-through, unhelpfully in this case.

The Flash_Read() and Flash_Write() code are not provided.

I'd focus on getting the reading from UART half of this working properly first.

[TDK]

Use a blocking UART receive call and ensure it returns a valid value.

[UUrcan]

Yes I did. And you are correct. It couldn't convert char to uint32 correctly. Do you know char to uint32 converting method?

[TDK]

Did you try to search?

https://stackoverflow.com/questions/7021725/how-to-convert-a-string-to-integer-in-c

[Piranha]

https://wiki.sei.cmu.edu/confluence/display/c/ERR34-C.+Detect+errors+when+converting+a+string+to+a+number

And, in addition to what others said, UART reception doesn't give you a zero-terminated C string.