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STM32F407 Buffer printing HAL_UART_Transmit

davidec
Associate III

Good morning everyone, after collecting some data and storing it in various buffers, I am trying to write them to the serial port for further processing. I am experiencing issues as I can see that something is being written to the serial port, but not all the samples in the buffer are being printed. Any suggestions?

 

  while (1)

  {

  HAL_UART_Receive (&huart2, UART1_rxBuffer, 1, 5000); //receive and store string

 

  if(UART1_rxBuffer[0] == 115){

  HAL_UART_Transmit(&huart2, UART1_rxBuffer, 1, 100); //print received string

  if(flag == 1){ //check add finished

  for(c=0;c<ADC_BUF_SIZE/2;c++){

  sprintf(str, "%hu",(uint16_t*)buf1[c]); // conversion in str of value

  HAL_UART_Transmit(&huart2, (uint8_t*)str, strlen(str), HAL_MAX_DELAY);

 

  HAL_Delay(10);

  }

  HAL_UART_Transmit(&huart2,(uint8_t *)space,strlen(space),10); // string = “— — — — ;”

  UART1_rxBuffer[0]=0; // start flag clear

  flag = 0; // conversion adc clear

  }

  }

 

  }

16 REPLIES 16

i have already done it. The adc sample the signal that i need and after the buffer filling I need, it does not change buf1 and buf2. The problem remains for me to print the values to serial and then process them externally.

 

for(i=0;i<ADC_BUF_SIZE/2;i++) { buf1[i] = (uint16_t)(adcBuf[i]&0x0000FFFF); buf2[i] = (uint16_t)(adcBuf[i]>>16); } }

 sprintf(str, "%hu",(uint16_t*)buf1[c]); // conversion in str of value

 Did you fix the error on this line? Show the corrected code.

 

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davidec
Associate III
while (1) { HAL_UART_Receive (&huart2, UART1_rxBuffer, 1, 5000); if(UART1_rxBuffer[0] == 115){ HAL_UART_Transmit(&huart2, UART1_rxBuffer, 1, 100); if(flag == 1){ for(c=0;c<ADC_BUF_SIZE/2;c++){ sprintf(str, "%u\r\n",((uint16_t*)buf1)[c]); // conversion in str of value HAL_UART_Transmit(&huart2, (uint8_t*)str, strlen(str), HAL_MAX_DELAY); HAL_Delay(100); } HAL_UART_Transmit(&huart2,(uint8_t *)space,strlen(space),10); UART1_rxBuffer[0]=0; flag = 0; } }

So show what is in buf1 array, and what you're seeing being printed. And what are you printing to?

Tips and Tricks with TimerCallback https://www.youtube.com/@eebykarl
If you find my solution useful, please click the Accept as Solution so others see the solution.
davidec
Associate III

Screenshot 2023-10-24 alle 11.02.56.png

So what interface are you using to communicate with uart2? I suspect that is your weak link.

 

I am using a STM32F407VG-Discovery, used your code and saved the same data that you've provided. When i press the letter 's', I am able to output all the data correctly.

 

Screenshot 2023-10-24 025636.pngScreenshot 2023-10-24 025645.png

Tips and Tricks with TimerCallback https://www.youtube.com/@eebykarl
If you find my solution useful, please click the Accept as Solution so others see the solution.
davidec
Associate III

I am using a TTL converter because via usb I cannot see the serial port. Is there some setting I'm missing?