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/*--------------------------------------------------------------------

 * TITLE: Plasma Bootloader

 * AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

 * DATE CREATED: 12/17/05

 * FILENAME: bootldr.c

 * PROJECT: Plasma CPU core

 * COPYRIGHT: Software placed into the public domain by the author.

 *    Software 'as is' without warranty.  Author liable for nothing.

 * DESCRIPTION:

 *    Plasma bootloader.

 *--------------------------------------------------------------------*/

#include "plasma.h"

#define MemoryRead(A) (*(volatile unsigned long*)(A))

#define MemoryWrite(A,V) *(volatile unsigned long*)(A)=(V)

extern void putchar(int ch);

extern int puts(const char *string);

extern int getch(void);

extern int kbhit(void);

extern int DdrInit(void);

typedef void (*FuncPtr)(void);

typedef unsigned long uint32;

typedef unsigned short uint16;

void FlashRead(uint16 *dst, uint32 byteOffset, int bytes)

{

   volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));

   *ptr = 0xff;                   //read mode

   while(bytes > 0)

   {

      *dst++ = (uint16)*ptr++;

      bytes -= 2;

   }

}

void FlashWrite(uint16 *src, uint32 byteOffset, int bytes)

{

   volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));

   while(bytes > 0)

   {

      *ptr = 0x40;                //write mode

      *ptr++ = *src++;            //write data

      while((*ptr & 0x80) == 0)   //check status

         ;

      bytes -= 2;

   }

}

void FlashErase(uint32 byteOffset)

{

   volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));

   *ptr = 0x20;                   //erase block

   *ptr = 0xd0;                   //confirm

   while((*ptr & 0x80) == 0)      //check status

      ;

}

char *xtoa(unsigned long num)

{

   static char buf[12];

   int i, digit;

   buf[8] = 0;

   for (i = 7; i >= 0; --i)

   {

      digit = num & 0xf;

      buf[i] = digit + (digit < 10 ? '0' : 'A' - 10);

      num >>= 4;

   }

   return buf;

}

unsigned long getnum(void)

{

   int i;

   unsigned long ch, ch2, value=0;

   for(i = 0; i < 16; )

   {

      ch = ch2 = getch();

      if(ch == '\n' || ch == '\r')

         break;

      if('0' <= ch && ch <= '9')

         ch -= '0';

      else if('A' <= ch && ch <= 'Z')

         ch = ch - 'A' + 10;

      else if('a' <= ch && ch <= 'z')

         ch = ch - 'a' + 10;

      else if(ch == 8)

      {

         if(i > 0)

         {

            --i;

            putchar(ch);

            putchar(' ');

            putchar(ch);

         }

         value >>= 4;

         continue;

      }

      putchar(ch2);

      value = (value << 4) + ch;

      ++i;

   }

   putchar('\r');

   putchar('\n');

   return value;

}

int main(void)

{

   int i, j, ch;

   unsigned long address, value, count;

   FuncPtr funcPtr;

   unsigned char *ptr1;

   DdrInit();  //Harmless if SDRAM instead of DDR

   puts("\nGreetings from the bootloader ");

   puts(__DATE__);

   puts(" ");

   puts(__TIME__);

   puts(":\n");

   MemoryWrite(FLASH_BASE, 0xff);  //read mode

   if((MemoryRead(GPIOA_IN) & 1) && (MemoryRead(FLASH_BASE) & 0xffff) == 0x3c1c)

   {

      puts("Boot from flash\n");

      FlashRead((uint16*)RAM_EXTERNAL_BASE, 0, 1024*128);

      funcPtr = (FuncPtr)RAM_EXTERNAL_BASE;

      funcPtr();

   }

   for(;;)

   {

      puts("\nWaiting for binary image linked at 0x10000000\n");

      puts("Other Menu Options:\n");

      puts("1. Memory read word\n");

      puts("2. Memory write word\n");

      puts("3. Memory read byte\n");

      puts("4. Memory write byte\n");

      puts("5. Jump to address\n");

      puts("6. Raw memory read\n");

      puts("7. Raw memory write\n");

      puts("8. Checksum\n");

      puts("9. Dump\n");

      puts("F. Copy 128KB from DDR to flash\n");

      puts("> ");

      ch = getch();

      address = 0;

      if('0' <= ch && ch <= '9')

      {

         putchar(ch);

         puts("\nAddress in hex> ");

         address = getnum();

         puts("Address = ");

         puts(xtoa(address));

         puts("\n");

      }

      switch(ch)

      {

      case '1':

         value = MemoryRead(address);

         puts(xtoa(value));

         puts("\n");

         break;

      case '2':

         puts("\nValue in hex> ");

         value = getnum();

         puts(xtoa(value));

         MemoryWrite(address, value);

         break;

      case '3':

         value = *(unsigned char*)address;

         puts(xtoa(value));

         puts("\n");

         break;

      case '4':

         puts("\nValue in hex> ");

         value = getnum();

         puts(xtoa(value));

         *(unsigned char*)address = value;

         break;

      case '5':

         funcPtr = (FuncPtr)address;

         funcPtr();

         break;

      case '6':

         puts("\nCount in hex> ");

         count = getnum();

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

         {

            ch = *(unsigned char*)(address + i);

            putchar(ch);

         }

         break;

      case '7':

         puts("\nCount in hex> ");

         count = getnum();

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

         {

            ch = getch();

            *(unsigned char*)(address+i) = ch;

         }

         break;

      case '8':

         puts("\nCount in hex> ");

         count = getnum();

         value = 0;

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

         {

            value += *(unsigned char*)(address+i);

         }

         puts(xtoa(value));

         putchar('\n');

         break;

      case '9':

         puts("\nCount in hex> ");

         count = getnum();

         value = 0;

         for(i = 0; i < count; i += 4)

         {

            if((i & 15) == 0)

               puts("\r\n");

            value = *(unsigned long*)(address+i);

            puts(xtoa(value));

            putchar(' ');

         }

         puts("\r\n");

         break;

      case 'F':

         FlashErase(0);

         FlashWrite((uint16*)RAM_EXTERNAL_BASE, 0, 1024*128);

         break;

      case 0x3c:   //raw test.bin file

         ptr1 = (unsigned char*)0x10000000;

         for(i = 0; i < 1024*1024; ++i)

         {

            ptr1[i] = (unsigned char)ch;

            for(j = 0; j < 10000; ++j)

            {

               if(kbhit())

                  break;

            }

            if(j >= 10000)

               break;       //assume end of file

            ch = getch();

         }

         funcPtr = (FuncPtr)0x10000000;

         funcPtr();

         break;

      }

   }

   return 0;

}