Use Uart between SmartRF06 EB and Raspberry Pi

Nguyen Hung3

Other Parts Discussed in Thread: CC2538, Z-STACK, CC2530

Hi all.

I want to implement SerialApp for cc2538 in EB. I use 3pins in EB are EM_UART_TX, EM_UART_RX and GND connect to Raspberry Pi. Is it correct?
Raspberry Pi is OK, but i cant get data from EB.

I use again project SampleLight in Home Automation and insert initial Serial Device following in zclSampleLight_Init

    halUARTCfg_t uartConfig;
    uartConfig.configured = TRUE; // 2430 don't care.
    uartConfig.baudRate = HAL_UART_BR_115200;
    uartConfig.flowControl = FALSE;
    uartConfig.flowControlThreshold = 48;
    uartConfig.rx.maxBufSize = 128;
    uartConfig.tx.maxBufSize = 128;
    uartConfig.idleTimeout = 6; // 2430 don't care.
    uartConfig.intEnable = TRUE; // 2430 don't care.
    uartConfig.callBackFunc = rxCB;
    HalUARTOpen (SERIAL_APP_PORT, &uartConfig);

where SERIAL_APP_PORT =0;

which static void rxCB( uint8 port, uint8 event )
{
    if ( event != HAL_UART_TX_EMPTY )
{

    // Read from UART
    //HalUARTRead( HAL_UART_PORT, pBuf, TXRX_BUF_LEN );
    //...//Process receiving pBuf data here by yourself.

   }
}

Initial:

uint8 data[2]; data[0] =0x30;data[1] =0x31;

I use function HalUARTWrite(SERIAL_APP_PORT,data,2);

Or, How to connect EB and other device (Raspberry Pi) through UART.

Thanks so much

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735475 points

SimpleLight project has enable MT UART support by default. You can have a try on it first. I only modify "#define MT_UART_DEFAULT_OVERFLOW TRUE" to "#define MT_UART_DEFAULT_OVERFLOW FALSE" in MT_UART.h to disable flow control. I can connect it to my PC ZTOOL without problem. By the way, I can use baudrate 38400 but can't switch it to 115200 on CC2538.

0 Nguyen Hung3 over 10 years ago in reply to YiKai Chen

Prodigy 140 points

hi YiKai Chen

Can you tell me more detail or document about mt_uart?
which are the function that i use to send or receive data from serial port? And how to use?

I'm sorry if my question is crazy....
Thanks so much

0 YiKai Chen over 10 years ago in reply to Nguyen Hung3

Guru 735475 points

You can refer to the Z-Stack Monitor and Test API.pdf in C:\Texas Instruments\Z-Stack Home 1.2.0\Documents\API folder.

0 Cetri over 10 years ago in reply to YiKai Chen

TI__Genius 9325 points

Hi Yikai,

115200pbs may require flow control. Please try with RTX/CTS on the Z-Tool and flow control enabled on CC2538. It should work.

- Cetri

0 YiKai Chen over 10 years ago in reply to Cetri

Guru 735475 points

Hi Cetri,

May I know why 115200 baudrate requires flow control? It seems unrelated.

0 Cetri over 10 years ago in reply to YiKai Chen

TI__Genius 9325 points

Hi Yikai,

It is not directly related, but faster transmission may cause data overflow earlier unless incoming data is processed in time. With slower data rate, CPU will have more sufficient time to process it and therefore it can be safer without flow control.

- Cetri

0 YiKai Chen over 10 years ago in reply to Cetri

Guru 735475 points

Hi Cetri,

I have another project using CC2530 with 115200 baud rate and no flow control. It works very well so I don't see the reason that CC2538 with cortex m3 can't use this configuration.

0 Cetri over 10 years ago in reply to YiKai Chen

TI__Genius 9325 points

Hi Yikai,

The main difference is, CC2530 UART is DMA driven by default while CC2538 UART is interrupt-driven in Z-Stack. So, ISR to fetch incoming data from the FIFO is more frequently called on CC2538.

- Cetri

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Use Uart between SmartRF06 EB and Raspberry Pi