Hello Community!! I am trying to send string to UART but it's not transmitting.I am using STM32F030R8T6 Valueline board.However when I am transmitting single char or decimal value it's going.

[ADain.1]

1.  

sprintf(buffer,"Hello\r\n");

 len=strlen(buffer);

 HAL_UART_Transmit(&huart1,(uint8_t *)buffer,strlen(buffer), 0xFFFF);

 HAL_Delay(100); // just in case required delay is given

2.

ch=83;

  HAL_UART_Transmit(&huart1, &ch, 1, 50);

  HAL_Delay(1);

  ch=87;

  HAL_UART_Transmit(&huart1, &ch, 1, 50);

  HAL_Delay(1);

  ch=73;

HAL_UART_Transmit(&huart1, &ch, 1, 50);

HAL_Delay(1);

ch=84;

HAL_UART_Transmit(&huart1, &ch, 1, 50);

HAL_Delay(1);

ch=67;

HAL_UART_Transmit(&huart1, &ch, 1, 50);

HAL_Delay(1);

ch=72;

HAL_UART_Transmit(&huart1, &ch, 1, 50);

HAL_Delay(1);

ch=49;

HAL_UART_Transmit(&huart1, &ch, 1, 50);

HAL_Delay(1);

If multiple single decimal's/char's were transmitted delay is required minimum 1 ms.

Kindly help me on this!!!!!!!!!!!!!!!

[AKSHAY1]

sprintf(buffer,"Hello\r\n");

HAL_UART_Transmit(&huart1,(uint8_t*)buffer,strlen((const char*)buffer),10);

just try this..

[ADain.1]

This is not working...Only first character is getting transmitted followed by garbage value

Hello,

The string that you are looking to send contain 7 characters, Kindly verify the size of the buffer, and reduce the delay from 0xFFFF.

char buffer [10] = "hello\r\n";

 HAL_UART_Transmit(&huart1,(uint8_t *)buffer,strlen(buffer), 10);

Hope that will help!

[ADain.1]

Same with this.......Only first character is getting transmitted followed by garbage value

[waclawek.jan]

What receiver are you using?

What is the hardware connection between the STM32 and receiver?

What are the baudrate etc. settings?

Do you use a crystal/HSE on the STM32?

Have you observed the waveforms using oscilloscope/logic analyzer?

JW

[ADain.1]

I am reading it through max3232 . Connection was done through jumper cable.

Baud Rate is 9600, Word length is 8 bit with non parity bit, Stop bit is 1, I am using HSI with x12 PLL,sysclk is 48MHz.

I did not observed waveforms yet...