flash/uart_boot/flash.c

   1 // flash.cpp : higher-level functions for flashing the chip
   2 //
   3
   4 #include "scalar_types.h" // (U)INT8/16/32
   5 #include "Uart.h" // platform abstraction for UART
   6 #include "client.h" // client functions
   7
   8
   9 // read the manufacturer and device ID
  10 int ReadID(tUartHandle serial_handle, UINT32 base, UINT8* pManufacturerID, UINT8* pDeviceID)
  11 {
  12         base &= 0xFFF80000; // round down to 512k align, to make shure
  13
  14         WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  15         WriteByte(serial_handle, base + 0x2AAA, 0x55);
  16         WriteByte(serial_handle, base + 0x5555, 0x90); // ID command
  17         SLEEP(20); // Atmel wants 20ms pause here
  18
  19         *pManufacturerID = ReadByte(serial_handle, base + 0);
  20         *pDeviceID               = ReadByte(serial_handle, base + 1);
  21
  22         WriteByte(serial_handle, base + 0, 0xF0);       // reset flash (back to normal read mode)
  23         SLEEP(20); // Atmel wants 20ms pause here
  24
  25         return 0;
  26 }
  27
  28
  29 // erase the sector which contains the given address
  30 int EraseSector(tUartHandle serial_handle, UINT32 address)
  31 {
  32         UINT32 base = address & 0xFFF80000; // round down to 512k align
  33
  34         WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  35         WriteByte(serial_handle, base + 0x2AAA, 0x55);
  36         WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
  37         WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  38         WriteByte(serial_handle, base + 0x2AAA, 0x55);
  39         WriteByte(serial_handle, address, 0x30); // eraze the sector
  40         SLEEP(25); // sector eraze time: 25ms
  41
  42         return 0;
  43 }
  44
  45
  46 // erase the whole flash
  47 int EraseChip(tUartHandle serial_handle, UINT32 base)
  48 {
  49         base &= 0xFFF80000; // round down to 512k align, to make shure
  50
  51         WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  52         WriteByte(serial_handle, base + 0x2AAA, 0x55);
  53         WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
  54         WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  55         WriteByte(serial_handle, base + 0x2AAA, 0x55);
  56         WriteByte(serial_handle, base + 0x5555, 0x10); // chip eraze command
  57         SLEEP(100); // chip eraze time: 100ms
  58
  59         return 0;
  60 }
  61
  62
  63 // program a bunch of bytes "by hand"
  64 int ProgramBytes(tUartHandle serial_handle, UINT32 address, UINT8* pData, UINT32 size)
  65 {
  66         UINT32 base = address & 0xFFF80000; // round down to 512k align
  67
  68         while (size--)
  69         {
  70                 WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
  71                 WriteByte(serial_handle, base + 0x2AAA, 0x55);
  72                 WriteByte(serial_handle, base + 0x5555, 0xA0); // byte program command
  73                 WriteByte(serial_handle, address++, *pData++);
  74                 // UART protocol is slow enough such that I don't have to wait 20us here
  75         }
  76         return 0;
  77 }
  78