Transmitter

/* ========================================
 *
 * Copyright YOUR COMPANY, THE YEAR
 * All Rights Reserved
 * UNPUBLISHED, LICENSED SOFTWARE.
 *
 * CONFIDENTIAL AND PROPRIETARY INFORMATION
 * WHICH IS THE PROPERTY OF your company.
 *
 * ========================================
*/
#include <project.h>

#define R_REGISTER          0x00 // 0000 0000 - logically OR with a register address
#define W_REGISTER          0x20 // 0010 0000 - as above
#define R_RX_PAYLOAD        0x61 // 0110 0001
#define W_TX_PAYLOAD        0xA0 // 1010 0000
#define NOP                 0xFF // to get the STATUS register

#define CONFIG              0x00
//#define EN_AA             0x01
//#define EN_RXADDR         0x02
#define SETUP_AW            0x03
//#define RF_CH             0x05
//#define RF_SETUP          0x06
#define STATUS              0x07
//#define RX_ADDR_P0        0x0A
//#define TX_ADDR           0x10
#define RX_PW_P0            0x11
#define FIFO_STATUS         0x17
#define DUMMYDATA           0x55 // 0101 0101 - just so it doesn't look like anything else

#define TX_DS               0x20
#define MAX_RT              0x10 // both for STATUS register

int main()
{
    uint8 spiData[2];
    uint8 status;

    CyGlobalIntEnable;
    SPI_Start();

    spiData[0] = W_REGISTER | CONFIG;
    spiData[1] = 0x4E;
    SPI_SpiUartPutArray(spiData,  2);       // reflect TX_DS and MAX_RT interrupts as IRQ active low, enable 2-byte CRC, power-up, TX mode

    spiData[0] = W_REGISTER | SETUP_AW;
    spiData[1] = 0x03;
    SPI_SpiUartPutArray(spiData,  2);       // 5 byte address

    spiData[0] = W_REGISTER | RX_PW_P0;
    spiData[1] = 0x01;
    SPI_SpiUartPutArray(spiData,  2);       // 1 byte of payload

    CE_Write(0);                            // stand-by

    for(;;)
    {
        spiData[0] = W_TX_PAYLOAD;
        spiData[1] = SW1_Read();
        SPI_SpiUartPutArray(spiData,  2);                   // send state of the switch to the TX FIFO
        CE_Write(1);                                        // enable chip - start sending data
        CyDelayUs(10);                                      // wait 10 microseconds
        if ( IRQ_Read() == 0 ){                             // check if there's an interrupt
            SPI_SpiUartWriteTxData(NOP);                    // send no-operation to receive STATUS register and check kind of the interrupt
            status = SPI_SpiUartReadRxData();               // read status register into a variable
            if ((status & TX_DS) == 1){                     // if data sent (or received when using enhanced shockburst mode) we're ok, so:
                CE_Write(0);                                // stop sending
                LED_Write(!LED_Read());                     // toggle LED state
                spiData[0]=STATUS;
                spiData[1]=TX_DS;
                SPI_SpiUartPutArray(spiData,  2);           // clear interrupt
            } else if ((status & MAX_RT) == 1) {            // if max retries achieved, we basically forget that packet
                CE_Write(0);                                // stop sending
                spiData[0]=STATUS;
                spiData[1]=MAX_RT;
                SPI_SpiUartPutArray(spiData,  2);           // clear interrupt
            }
        }

    }
}

/* [] END OF FILE */