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// Little program to dump the contents of the SPI flash memory it's connected 

// to on the board

#include "cpu-utils.h"

#include "board.h"

#include "uart.h"

#include "simple-spi.h"

#include "printf.h"

int spi_master;

char slave;

void

spi_write_ignore_read(int core, char dat)

{

  spi_core_write_data(core,dat);

  while (!(spi_core_data_avail(core))); // Wait for the transaction (should 

                                        // generate a byte)

  spi_core_read_data(core);

}

char

spi_read_ignore_write(int core)

{

  spi_core_write_data(core, 0x00);

  while (!(spi_core_data_avail(core))); // Wait for the transaction (should 

                                        // generate a byte)

  return spi_core_read_data(core);

}

unsigned long

spi_read_id(int core, char slave_sel)

{

  unsigned long rdid;

  char* rdid_ptr = (char*) &rdid;

  int i;

  spi_core_slave_select(core, slave_sel); // Select slave

  rdid_ptr[3] = 0;

  // Send the RDID command

  spi_write_ignore_read(core,0x9f); // 0x9f is READ ID command

  // Now we read the next 3 bytes

  for(i=0;i<3;i++)

    {

      rdid_ptr[i] = spi_read_ignore_write(core);

    }

  spi_core_slave_select(core, 0); // Deselect slave

  return rdid;

}

// Read status regsiter

char

spi_read_sr(int core, char slave_sel)

{

  char rdsr;

  spi_core_slave_select(core, slave_sel); // Select slave

  // Send the RDSR command

  spi_write_ignore_read(core,0x05); // 0x05 is READ status register command

  rdsr = spi_read_ignore_write(core);

  spi_core_slave_select(core, 0); // Deselect slave  

  return rdsr;

}

void

spi_read_block(int core, char slave_sel, unsigned int addr, int num_bytes,

               char* buf)

{

  int i;

  spi_core_slave_select(core, slave_sel); // Select slave

  spi_write_ignore_read(core, 0x3); // READ command

  spi_write_ignore_read(core,((addr >> 16) & 0xff)); // addres high byte

  spi_write_ignore_read(core,((addr >> 8) & 0xff)); // addres middle byte

  spi_write_ignore_read(core,((addr >> 0) & 0xff)); // addres low byte

  for(i=0;i<num_bytes;i++)

    buf[i] = spi_read_ignore_write(core);

  spi_core_slave_select(core, 0); // Deselect slave  

}

#define printhelp() printf("\nUsage: \n\t[d]ump\t\tdump 256 bytes of data to screen from flash\n\t[+/-]\t\tIncrease/decrease dump address by 256 bytes\n\t[</>]\t\tIncrease/decrease dump address by 4096 bytes\n\t[s]tatus\t\tprint status of SPI flash\n\n")

void

print_spi_status(void)

{

  printf("SPI core: %d\n",spi_master);

  printf("SPI slave select: 0x%x\n",slave&0xff);

  printf("SPI slave info:\n");

  printf("\tID:\t%x\n", spi_read_id(spi_master, slave));

  printf("\tSR:\t%x\n", spi_read_sr(spi_master, slave));

  printf("\n");

}

int

main()

{

  uart_init(0); // init the UART before we can printf

  volatile char c;

  int i,j;

  spi_master = 0;

  slave = 1;

  spi_core_slave_select(spi_master, 0); // Deselect slaves

  // Clear the read FIFO

  while (spi_core_data_avail(spi_master))

    c = spi_core_read_data(spi_master);

  // SPI core 0, should already be configured to read out data

  // when we reset.

  printf("\n\n\tSPI dumping app\n\n");

  unsigned long dump_addr = 0;

  char read_buf[256];

  int dump_amount = 0x100;

  while(1){

    printf("[d,+,-,s,h] > ");

    c = uart_getc(DEFAULT_UART);

    if ((c != '+') && (c != '-') && (c != '<') && (c != '>') )

      {

        printf("%c ",c);

        printf("\n");

      }

    if (c == 'h')

      printhelp();

    else if (c == 's')

      print_spi_status();

    else if (c == '+')

      {

        dump_addr += dump_amount;

        printf("dump_addr= 0x%x\r", dump_addr);

      }

    else if (c == '-')

      {

        dump_addr -= dump_amount;

        printf("dump_addr= 0x%x\r", dump_addr);

      }

    else if (c == '>')

      {

        dump_addr += dump_amount*16;

        printf("dump_addr= 0x%x\r", dump_addr);

      }

    else if (c == '<')

      {

        dump_addr -= dump_amount*16;

        printf("dump_addr= 0x%x\r", dump_addr);

      }

    else if (c == 'd')

      {

        spi_read_block(spi_master, 1, dump_addr, dump_amount, read_buf);

        // Print it out, 32 bytes across each time

        for(i=0;i<(dump_amount/32);i++)

          {

            printf("%.5x: ", (i*32)+dump_addr);

            for(j=0;j<32;j++)

              printf("%.2x", read_buf[(i*32)+j] & 0xff);

            printf("\n");

          }

        dump_addr += dump_amount;

      }

  }

  return 0;

}