xyFC/src/cc2500.c

/*
 * CC2500 helper routines
 */

#ifdef DEBUG
//#define DEBUG_STATUS
#endif

#include <util/delay.h>

#include "spi.h"
#include "cc2500.h"
#include "main.h"

#ifdef DEBUG_STATUS

static void cc2500PrintStatusByte(uint8_t status) {
    static int16_t lastStatusByte = -1;
    //if ((status & ~CC2500_STATUS_FIFO_BYTES_AVAILABLE_BM) != (lastStatusByte & ~CC2500_STATUS_FIFO_BYTES_AVAILABLE_BM)) {
    if (status != lastStatusByte) {
        lastStatusByte = status;

        debugWrite("\nStatus change: 0x");
        debugHex(status);
        debugWrite("\n");

        if (status & CC2500_STATUS_CHIP_RDYn_BM) {
            debugWrite("  Power/Crystal NOT ready!\n");
        }

        debugWrite("  State: ");
        switch (status & CC2500_STATUS_STATE_BM) {
            case CC2500_STATE_IDLE:
                debugWrite("IDLE");
                break;

            case CC2500_STATE_RX:
                debugWrite("RX");
                break;

            case CC2500_STATE_TX:
                debugWrite("TX");
                break;

            case CC2500_STATE_FSTXON:
                debugWrite("Freq Synth TX on");
                break;

            case CC2500_STATE_CALIBRATE:
                debugWrite("Freq Synth Calibration");
                break;

            case CC2500_STATE_SETTLING:
                debugWrite("PLL settling");
                break;

            case CC2500_STATE_RX_OVERFLOW:
                debugWrite("RX FIFO Overflow");
                break;

            case CC2500_STATE_TX_UNDERFLOW:
                debugWrite("TX FIFO Underflow");
                break;

            default:
                debugWrite("UNKNOWN");
                break;
        }
        debugWrite("\n");

        debugWrite("  FIFO Bytes available: 0x");
        debugHex(status & CC2500_STATUS_FIFO_BYTES_AVAILABLE_BM);
        debugWrite("\n\n");
    }
}
#endif

void cc2500ReadRegisterMulti(uint8_t address, uint8_t data[], uint8_t length) {
    CS_off;

#ifdef DEBUG_STATUS
    uint8_t status = spiWrite(address);
#else
    spiWrite(address);
#endif

    for (uint8_t i = 0; i < length; i++) {
        data[i] = spiRead();
    }

    CS_on;

#ifdef DEBUG_STATUS
    cc2500PrintStatusByte(status);
#endif
}

void cc2500WriteRegisterMulti(uint8_t address, const uint8_t data[], uint8_t length) {
    CS_off;

#ifdef DEBUG_STATUS
    uint8_t status = spiWrite(CC2500_WRITE_BURST | address);
#else
    spiWrite(CC2500_WRITE_BURST | address);
#endif

    for (uint8_t i = 0; i < length; i++) {
        spiWrite(data[i]);
    }

    CS_on;

#ifdef DEBUG_STATUS
    cc2500PrintStatusByte(status);
#endif
}

void cc2500WriteReg(uint8_t address, uint8_t data) {
    CS_off;

#ifdef DEBUG_STATUS
    uint8_t status = spiWrite(address);
#else
    spiWrite(address);
#endif

    NOP();
    spiWrite(data);
    CS_on;

#ifdef DEBUG_STATUS
    cc2500PrintStatusByte(status);
#endif
}

uint8_t cc2500ReadReg(uint8_t address) {
    CS_off;

    if ((address >= 0x30) && (address <= 0x3D)) {
        // Status Registers need a burst read
        address |= CC2500_READ_BURST;
    } else {
        address |= CC2500_READ_SINGLE;
    }

#ifdef DEBUG_STATUS
    uint8_t status = spiWrite(address);
#else
    spiWrite(address);
#endif

    uint8_t result = spiRead();
    CS_on;

#ifdef DEBUG_STATUS
    cc2500PrintStatusByte(status);
#endif

    return result;
}

void cc2500Strobe(uint8_t address) {
    CS_off;

#ifdef DEBUG_STATUS
    uint8_t status = spiWrite(address);
#else
    spiWrite(address);
#endif

    CS_on;

#ifdef DEBUG_STATUS
    cc2500PrintStatusByte(status);
#endif
}

void cc2500ResetChip(void) {
    // Toggle chip select signal
    CS_on;
    _delay_us(30);
    CS_off;
    _delay_us(30);
    CS_on;
    _delay_us(45);
    cc2500Strobe(CC2500_SRES);
    _delay_ms(100);
}