#include "common.h"
static uint8_t tx_buffer[TR_BUFF_SIZE];
static uint8_t rx_buffer[TR_BUFF_SIZE];

int main()
{
    uint32_t rx_sum = 0;
    uint32_t tx_sum = 0;
    uint8_t tmp;
    uint32_t tx_crc = 0;
    uint32_t tx_crc_old = 0;
    uint32_t a = 364;
    uint32_t b = 53457;
    uint32_t c = 976;
    uint32_t d = 66;


    init();
    // initialize buffers with some known value
    memset(tx_buffer,0x33,sizeof(tx_buffer));
    memset(rx_buffer,0x44,sizeof(rx_buffer));

    // wait for keystroke: this gives the user time to start the slave
    Report("Start the slave and press any key to transmit data....\n\r");
    MAP_UARTCharGet(UARTA0_BASE);

    // configure SPI channel
    MAP_SPIReset(GSPI_BASE);
    MAP_SPIConfigSetExpClk(GSPI_BASE,MAP_PRCMPeripheralClockGet(PRCM_GSPI),
                     SPI_IF_BIT_RATE,SPI_MODE_MASTER,SPI_SUB_MODE_0,
                     (SPI_SW_CTRL_CS |
                     SPI_4PIN_MODE |
                     SPI_TURBO_OFF |
                     SPI_CS_ACTIVEHIGH |
                     SPI_WL_8));
    MAP_SPIEnable(GSPI_BASE);

    tx_crc = fill_buffer(tx_buffer,TR_BUFF_SIZE,"TX");

    while(1)
    {
        tx_crc_old = tx_crc;
        change_seed(a++,b++,c++,d++);
        tx_crc = fill_buffer(tx_buffer,TR_BUFF_SIZE,"TX");
        Message("Sending...");
        //MAP_SPITransfer(GSPI_BASE,tx_buffer,rx_buffer, TR_BUFF_SIZE,
        //      SPI_CS_ENABLE|SPI_CS_DISABLE);
        SPICSEnable(GSPI_BASE);
        for(int i = 0; i < TR_BUFF_SIZE; i++)
        {
            SPIDataPut(GSPI_BASE,tx_buffer[i]);
            //Message("x");
            SPIDataGet(GSPI_BASE,&rx_buffer[i]);
        }
        Message("Transfer complete!\n\r");
        SPICSDisable(GSPI_BASE);

        rx_sum = 0;
        for(int i = 0; i < TR_BUFF_SIZE; i++)
        {
            rx_sum += rx_buffer[i];
        }
        Report("\n\rChecksum in the RX buffer was: 0x%02x, we send 0x%02x\n\r\n\r",crc(rx_buffer),tx_crc_old);
        //Report("The sum in the Rx buffer is: %d, tx was : %d\n\r",rx_sum,tx_sum);
        Message("TX-");
        print_buffer(tx_buffer,TR_BUFF_SIZE);
        Message("RX-");
        print_buffer(rx_buffer,TR_BUFF_SIZE);
        Report("Press any key to transmit again\n\r");
        MAP_UARTCharGet(UARTA0_BASE);
    }
    return 0;
}