Using 2 UART on STM32?

[antonius]

Dear Members,

I want to read a result from my GPS,

it's Neo 6M

I initialized 2 UARTs UART 1 for PC and UART 2 for GPS,

I got this result :

INIT CODE GPS NEO - 6M....

From GPS : 

Is it receiving properly ?

The code :

 char in[8];

printf("From GPS : ");

  HAL_UART_Receive(&huart2, (uint8_t *)in, 8, 1000);

HAL_UART_Transmit(&huart1, (uint8_t *)in, 8, 1);

printf("\r\n");

Green LED on GPS module is blinking...

Thanks

[Tesla DeLorean]

I would expect NMEA sentences at 9600 8N1

Your HAL functions block, so no ideal for forwarding data.​

[AvaTar]

> I would expect NMEA sentences at 9600 8N1

This are the default setting of the module.

Do you have the baudrate of the STM32 MCU set properly ?

And not changed the module's setting to binary UBX messages ?

In addition to the inappropriateness of said HAL functions.

[Tesla DeLorean]

Seems too consistent and wrong data to be UBX. Would need to know more about specific implementation. NAZA​ UAV modules for example output their own packet format.

One could observe data with a scope, or use USB to CMOS Serial directly from NEO-6M module.​

[Tesla DeLorean]

Does the receive call function or does it return an error? Try clearing the buffer and checking. Post lacks a lot of salient details which would help diagnose situation.

To answer the underlying question, No this doesn't look to be receiving properly/correctly. ​

[antonius]

void MX_USART1_UART_Init(void)
{
 
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  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();
  }
 
}
/* USART2 init function */
 
void MX_USART2_UART_Init(void)
{
 
  huart2.Instance = USART2;
  //huart2.Init.BaudRate = 115200;
	huart2.Init.BaudRate = 9600;//NEO6M Baudrate
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
 
}

UART Setting from STM32CubeMX

@Clive

Which UART buffer should I clear ?

[antonius]

I'm using the module indoor, does it receive signal ?

Or without a signal, at least I can read its ID with UART ?

Is this the right manual ?

https://www.terraelectronica.ru/pdf/show?pdf_file=%2Fz%2FDatasheet%2FU%2FUART+GPS+NEO-6M+User+Manual.pdf

or there's another more comprehensive one ?

Thanks

[antonius]

the module is like this :

https://www.addicore.com/NEO-6M-GPS-p/231.htm

[antonius]

https://www.u-blox.com/en/product/neo-6-series#tab-documentation-resources .....

[antonius]

I got output from

serial to PC

May be with interrupt is better ?

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)

{

display to pc here

}