Vertical Hydroponics: Blog 6 - EZR32WG Wireless Starter Kit: Part 1

Hi James O'Donnell,

I am trying to do the same with two EZR32. I get the temperature in one module and I want to send it to the other one.

I began with the ezradio_simple_trx program too and added code from the humitemp program. I can read the temperature perfectly into the board "Node1" (like a char for example and print into the screen), however, to send it I have to convert int32_t (temData variable) to uint8_t (radioTxPkt, argument of ezradioStartTransmitDefault() function). I have tried several options but I don't know how to convert it. I am almost rookie so maybe I am really wrong. Could you please help me?

Cheers

Tini

Thanks Rick.

This editor is just really horrible sometimes. :/

Anyway... I had to find the correct route location value by trial and error. It was LOC3 for the EFM32ZG.

1. /* Enable I/O pins at UART1 location #2 */ 
2.    uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | USART_ROUTE_LOCATION_LOC1;

Sure thing James. I got most of this from the SiLabs forums. It was not a no-brainer. The main issue for me was the

#include "main.h"


/* Setup UART1 in async mode for RS232*/
static USART_TypeDef   * uart   = USART1;
static USART_InitAsync_TypeDef uartInit = USART_INITASYNC_DEFAULT;


// System global serial.h extern USART1 RX interrupt flag
bool gserialDataRx = false;


unsigned char gRxCircularBuffer[CIRC_BUFF_SIZE] = { NUL_CHAR };
int gRxCircularBufferCounter = 0;
/**************************************************************************//**
 * @brief USART1 Interrupt handler for data received
 *****************************************************************************/
void USART1_RX_IRQHandler(void)
{
  // if RX buffer contains valid data proc char
    while(USART1->STATUS & (1 << 7)) //USART_IF_RXDATAV
    {
         // If end of circular buffer then add BEL and reset
         if ( gRxCircularBufferCounter == CIRC_BUFF_SIZE-1)
         {
              gRxCircularBuffer[gRxCircularBufferCounter] = BEL;
              gRxCircularBufferCounter = 0;
         }


         // add char to circular buffer
         gRxCircularBuffer[gRxCircularBufferCounter++] = USART1->RXDATA;
    }


    // Clear interrupt
    USART_IntClear(USART1, (1 << 7));
}


void UartSetup(void)
{
  /* Enable clock for GPIO module (required for pin configuration) */
  //CMU_ClockEnable(cmuClock_GPIO, true);


  // Initialize USART1 clock
  CMU_ClockEnable(cmuClock_USART1, true);


  /* Configure expansion header USART1 GPIO pins */
  GPIO_PinModeSet(gpioPortD, 0, gpioModePushPull, 1);
  GPIO_PinModeSet(gpioPortD, 1, gpioModeInput, 0);




   /* Prepare struct for initializing UART in asynchronous mode*/
   uartInit.enable       = usartDisable;   /* Don't enable UART upon intialization */
   uartInit.refFreq      = 0;              /* Provide information on reference frequency. When set to 0, the reference frequency is */
   uartInit.baudrate     = 115200;         /* Baud rate */
   uartInit.oversampling = usartOVS16;     /* Oversampling. Range is 4x, 6x, 8x or 16x */
   uartInit.databits     = usartDatabits8; /* Number of data bits. Range is 4 to 10 */
   uartInit.parity       = usartNoParity;  /* Parity mode */
   uartInit.stopbits     = usartStopbits1; /* Number of stop bits. Range is 0 to 2 */
   uartInit.mvdis        = false;          /* Disable majority voting */
   uartInit.prsRxEnable  = false;          /* Enable USART Rx via Peripheral Reflex System */
   uartInit.prsRxCh      = usartPrsRxCh0;  /* Select PRS channel if enabled */


   /* Initialize USART with uartInit struct */
   USART_InitAsync(uart, &uartInit);


   /* Prepare UART Rx and Tx interrupts */
   USART_IntClear(uart, _USART_IF_MASK);
   USART_IntEnable(uart, USART_IF_RXDATAV);
   NVIC_ClearPendingIRQ(USART1_RX_IRQn);
   NVIC_ClearPendingIRQ(USART1_TX_IRQn);
   NVIC_EnableIRQ(USART1_RX_IRQn);
   NVIC_EnableIRQ(USART1_TX_IRQn);


   /* Enable I/O pins at UART1 location #2 */
   uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | USART_ROUTE_LOCATION_LOC1;


   /* Enable UART */
   USART_Enable(uart, usartEnable);
}

Hey Rick do you mind sharing your code for using the UART? I thought it would be easy enough to set up, but I'm running into some problems.