'sweeplf' tells us antenna's resonant frequency

[proxmark3-svn] / armsrc / fpga.c

//-----------------------------------------------------------------------------
// Routines to load the FPGA image, and then to configure the FPGA's major
// mode once it is configured.
//
// Jonathan Westhues, April 2006
//-----------------------------------------------------------------------------
#include <proxmark3.h>
#include "apps.h"

//-----------------------------------------------------------------------------
// Set up the Serial Peripheral Interface as master
// Used to write the FPGA config word
// May also be used to write to other SPI attached devices like an LCD
//-----------------------------------------------------------------------------
void SetupSpi(int mode)
{
        // PA10 -> SPI_NCS2 chip select (LCD)
        // PA11 -> SPI_NCS0 chip select (FPGA)
        // PA12 -> SPI_MISO Master-In Slave-Out
        // PA13 -> SPI_MOSI Master-Out Slave-In
        // PA14 -> SPI_SPCK Serial Clock

        // Disable PIO control of the following pins, allows use by the SPI peripheral
        PIO_DISABLE                      =      (1 << GPIO_NCS0)        |
                                                        (1 << GPIO_NCS2)        |
                                                        (1 << GPIO_MISO)        |
                                                        (1 << GPIO_MOSI)        |
                                                        (1 << GPIO_SPCK);

        PIO_PERIPHERAL_A_SEL =  (1 << GPIO_NCS0)        |
                                                        (1 << GPIO_MISO)        |
                                                        (1 << GPIO_MOSI)        |
                                                        (1 << GPIO_SPCK);

        PIO_PERIPHERAL_B_SEL =  (1 << GPIO_NCS2);

        //enable the SPI Peripheral clock
        PMC_PERIPHERAL_CLK_ENABLE = (1<<PERIPH_SPI);
        // Enable SPI
        SPI_CONTROL = SPI_CONTROL_ENABLE;

        switch (mode) {
                case SPI_FPGA_MODE:
                        SPI_MODE =
                                ( 0 << 24)      |       // Delay between chip selects (take default: 6 MCK periods)
                                (14 << 16)      |       // Peripheral Chip Select (selects FPGA SPI_NCS0 or PA11)
                                ( 0 << 7)       |       // Local Loopback Disabled
                                ( 1 << 4)       |       // Mode Fault Detection disabled
                                ( 0 << 2)       |       // Chip selects connected directly to peripheral
                                ( 0 << 1)       |       // Fixed Peripheral Select
                                ( 1 << 0);              // Master Mode
                        SPI_FOR_CHIPSEL_0 =
                                ( 1 << 24)      |       // Delay between Consecutive Transfers (32 MCK periods)
                                ( 1 << 16)      |       // Delay Before SPCK (1 MCK period)
                                ( 6 << 8)       |       // Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
                                ( 8 << 4)       |       // Bits per Transfer (16 bits)
                                ( 0 << 3)       |       // Chip Select inactive after transfer
                                ( 1 << 1)       |       // Clock Phase data captured on leading edge, changes on following edge
                                ( 0 << 0);              // Clock Polarity inactive state is logic 0
                        break;
                case SPI_LCD_MODE:
                        SPI_MODE =
                                ( 0 << 24)      |       // Delay between chip selects (take default: 6 MCK periods)
                                (11 << 16)      |       // Peripheral Chip Select (selects LCD SPI_NCS2 or PA10)
                                ( 0 << 7)       |       // Local Loopback Disabled
                                ( 1 << 4)       |       // Mode Fault Detection disabled
                                ( 0 << 2)       |       // Chip selects connected directly to peripheral
                                ( 0 << 1)       |       // Fixed Peripheral Select
                                ( 1 << 0);              // Master Mode
                        SPI_FOR_CHIPSEL_2 =
                                ( 1 << 24)      |       // Delay between Consecutive Transfers (32 MCK periods)
                                ( 1 << 16)      |       // Delay Before SPCK (1 MCK period)
                                ( 6 << 8)       |       // Serial Clock Baud Rate (baudrate = MCK/6 = 24Mhz/6 = 4M baud
                                ( 1 << 4)       |       // Bits per Transfer (9 bits)
                                ( 0 << 3)       |       // Chip Select inactive after transfer
                                ( 1 << 1)       |       // Clock Phase data captured on leading edge, changes on following edge
                                ( 0 << 0);              // Clock Polarity inactive state is logic 0
                        break;
                default:                                // Disable SPI
                        SPI_CONTROL = SPI_CONTROL_DISABLE;
                        break;
        }
}

//-----------------------------------------------------------------------------
// Set up the synchronous serial port, with the one set of options that we
// always use when we are talking to the FPGA. Both RX and TX are enabled.
//-----------------------------------------------------------------------------
void FpgaSetupSsc(void)
{
        // First configure the GPIOs, and get ourselves a clock.
        PIO_PERIPHERAL_A_SEL =  (1 << GPIO_SSC_FRAME)   |
                                                        (1 << GPIO_SSC_DIN)             |
                                                        (1 << GPIO_SSC_DOUT)    |
                                                        (1 << GPIO_SSC_CLK);
        PIO_DISABLE = (1 << GPIO_SSC_DOUT);

        PMC_PERIPHERAL_CLK_ENABLE = (1 << PERIPH_SSC);

        // Now set up the SSC proper, starting from a known state.
        SSC_CONTROL = SSC_CONTROL_RESET;

        // RX clock comes from TX clock, RX starts when TX starts, data changes
        // on RX clock rising edge, sampled on falling edge
        SSC_RECEIVE_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(1) | SSC_CLOCK_MODE_START(1);

        // 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
        // pulse, no output sync, start on positive-going edge of sync
        SSC_RECEIVE_FRAME_MODE = SSC_FRAME_MODE_BITS_IN_WORD(8) |
                SSC_FRAME_MODE_MSB_FIRST | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);

        // clock comes from TK pin, no clock output, outputs change on falling
        // edge of TK, start on rising edge of TF
        SSC_TRANSMIT_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(2) |
                SSC_CLOCK_MODE_START(5);

        // tx framing is the same as the rx framing
        SSC_TRANSMIT_FRAME_MODE = SSC_RECEIVE_FRAME_MODE;

        SSC_CONTROL = SSC_CONTROL_RX_ENABLE | SSC_CONTROL_TX_ENABLE;
}

//-----------------------------------------------------------------------------
// Set up DMA to receive samples from the FPGA. We will use the PDC, with
// a single buffer as a circular buffer (so that we just chain back to
// ourselves, not to another buffer). The stuff to manipulate those buffers
// is in apps.h, because it should be inlined, for speed.
//-----------------------------------------------------------------------------
void FpgaSetupSscDma(BYTE *buf, int len)
{
        PDC_RX_POINTER(SSC_BASE) = (DWORD)buf;
        PDC_RX_COUNTER(SSC_BASE) = len;
        PDC_RX_NEXT_POINTER(SSC_BASE) = (DWORD)buf;
        PDC_RX_NEXT_COUNTER(SSC_BASE) = len;
        PDC_CONTROL(SSC_BASE) = PDC_RX_ENABLE;
}

//-----------------------------------------------------------------------------
// Download the FPGA image stored in flash (slave serial).
//-----------------------------------------------------------------------------
void FpgaDownloadAndGo(void)
{
        // FPGA image lives in FLASH at base address 0x2000
        // The current board design can not accomodate anything bigger than a XC2S30
        // FPGA and the config file size is fixed at 336,768 bits = 10,524 DWORDs
        const DWORD *FpgaImage=((DWORD *)0x2000);
        const DWORD FpgaImageLen=10524;

        int i, j;

        PIO_OUTPUT_ENABLE = (1 << GPIO_FPGA_ON);
        PIO_ENABLE = (1 << GPIO_FPGA_ON);
        PIO_OUTPUT_DATA_SET = (1 << GPIO_FPGA_ON);

        SpinDelay(50);

        LED_D_ON();

        HIGH(GPIO_FPGA_NPROGRAM);
        LOW(GPIO_FPGA_CCLK);
        LOW(GPIO_FPGA_DIN);
        PIO_OUTPUT_ENABLE = (1 << GPIO_FPGA_NPROGRAM)   |
                                                (1 << GPIO_FPGA_CCLK)           |
                                                (1 << GPIO_FPGA_DIN);
        SpinDelay(1);

        LOW(GPIO_FPGA_NPROGRAM);
        SpinDelay(50);
        HIGH(GPIO_FPGA_NPROGRAM);

        for(i = 0; i < FpgaImageLen; i++) {
                DWORD v = FpgaImage[i];
                for(j = 0; j < 32; j++) {
                        if(v & 0x80000000) {
                                HIGH(GPIO_FPGA_DIN);
                        } else {
                                LOW(GPIO_FPGA_DIN);
                        }
                        HIGH(GPIO_FPGA_CCLK);
                        LOW(GPIO_FPGA_CCLK);
                        v <<= 1;
                }
        }

        LED_D_OFF();
}

//-----------------------------------------------------------------------------
// Send a 16 bit command/data pair to the FPGA.
// The bit format is:  C3 C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
// where C is the 4 bit command and D is the 12 bit data
//-----------------------------------------------------------------------------
void FpgaSendCommand(WORD cmd, WORD v)
{
        SetupSpi(SPI_FPGA_MODE);
        while ((SPI_STATUS & SPI_STATUS_TX_EMPTY) == 0);                // wait for the transfer to complete
        SPI_TX_DATA = SPI_CONTROL_LAST_TRANSFER | cmd | v;              // send the data
}
//-----------------------------------------------------------------------------
// Write the FPGA setup word (that determines what mode the logic is in, read
// vs. clone vs. etc.). This is now a special case of FpgaSendCommand() to
// avoid changing this function's occurence everywhere in the source code.
//-----------------------------------------------------------------------------
void FpgaWriteConfWord(BYTE v)
{
        FpgaSendCommand(FPGA_CMD_SET_CONFREG, v);
}

//-----------------------------------------------------------------------------
// Set up the CMOS switches that mux the ADC: four switches, independently
// closable, but should only close one at a time. Not an FPGA thing, but
// the samples from the ADC always flow through the FPGA.
//-----------------------------------------------------------------------------
void SetAdcMuxFor(int whichGpio)
{
        PIO_OUTPUT_ENABLE = (1 << GPIO_MUXSEL_HIPKD) |
                                                (1 << GPIO_MUXSEL_LOPKD) |
                                                (1 << GPIO_MUXSEL_LORAW) |
                                                (1 << GPIO_MUXSEL_HIRAW);

        PIO_ENABLE              =       (1 << GPIO_MUXSEL_HIPKD) |
                                                (1 << GPIO_MUXSEL_LOPKD) |
                                                (1 << GPIO_MUXSEL_LORAW) |
                                                (1 << GPIO_MUXSEL_HIRAW);

        LOW(GPIO_MUXSEL_HIPKD);
        LOW(GPIO_MUXSEL_HIRAW);
        LOW(GPIO_MUXSEL_LORAW);
        LOW(GPIO_MUXSEL_LOPKD);

        HIGH(whichGpio);
}