Problem receiving data from CC2540

[tonyblake9]

Posted on July 13, 2017 at 18:28

Hi,

I have an STM32 and am trying to receive a single byte of data from a CC2540 over UART. I've verified that the data transmission from the CC2540 is working properly (I can receive the data in a serial terminal) but for some reason the data is not being received by the STM32. I am using USART3_IRQ on the STM32 and have verified that it is working properly (I can trigger USART3_IRQ by sending test data from a serial terminal).

Can anyone help me with this? It's very puzzling.

Cheers,

Tony

#uart #stm32 #cc2540

[Tesla DeLorean]

Posted on July 13, 2017 at 19:01

>>

Can anyone help me with this? It's very puzzling.

Even more so with no HW or SW to look at.

[tonyblake9]

Posted on July 17, 2017 at 16:04

I am using a custom pcb with an onboard STM32 and CC2540 physically connected together over USART3. I have programmed the CC2540 to relay a single byte of data over USART3 and programmed the STM32 to receive this data in USART3_IRQ. Here is the relevant code from each device:

1) CC2540 (BLE_Bridge):

   static void simpleProfileChangeCB( uint8 paramID )

   {       uint8 data[20];       uint8 len;       switch( paramID )       {          case HORIZON_VALUE:             SimpleProfile_GetParameter( HORIZON_VALUE, &data );             len = data[0];             //keep trying to send data until it is a success. this may not be the desirable approach             while (sendDataToHost(&data[1], len));             break;

         default:

         // do nothing          break;

      }

}

2) STM32:

void USART3_IRQHandler(void)

{   RXNE_flag = USART_GetFlagStatus(USART3, USART_IT_RXNE);    RXNE_IT_status = USART_GetITStatus(USART3, USART_IT_RXNE);    if(RXNE_IT_status != RESET){       horizon_val = (s16) USART_ReceiveData(USART3);    }}

As I said, I can successfully send data to the STM32 through a serial terminal so USART3_IRQ should be triggered when the CC2540 transmits the data.

I have configured USART3 on the CC2540 to use DMA, do I have to use DMA on the STM32 as well?

Tony