forked from len0rd/rockbox
6a4e4c87c2
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4083 a1c6a512-1295-4272-9138-f99709370657
77 lines
No EOL
2.5 KiB
C
77 lines
No EOL
2.5 KiB
C
// flash.cpp : higher-level functions for flashing the chip
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//
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#include "scalar_types.h" // (U)INT8/16/32
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#include "Uart.h" // platform abstraction for UART
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#include "client.h" // client functions
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// read the manufacturer and device ID
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int ReadID(tUartHandle serial_handle, UINT32 base, UINT8* pManufacturerID, UINT8* pDeviceID)
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{
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base &= 0xFFF80000; // round down to 512k align, to make shure
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, base + 0x5555, 0x90); // ID command
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SLEEP(20); // Atmel wants 20ms pause here
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*pManufacturerID = ReadByte(serial_handle, base + 0);
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*pDeviceID = ReadByte(serial_handle, base + 1);
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WriteByte(serial_handle, base + 0, 0xF0); // reset flash (back to normal read mode)
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SLEEP(20); // Atmel wants 20ms pause here
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return 0;
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}
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// erase the sector which contains the given address
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int EraseSector(tUartHandle serial_handle, UINT32 address)
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{
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UINT32 base = address & 0xFFF80000; // round down to 512k align
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, address, 0x30); // eraze the sector
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SLEEP(25); // sector eraze time: 25ms
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return 0;
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}
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// erase the whole flash
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int EraseChip(tUartHandle serial_handle, UINT32 base)
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{
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base &= 0xFFF80000; // round down to 512k align, to make shure
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, base + 0x5555, 0x80); // eraze command
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, base + 0x5555, 0x10); // chip eraze command
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SLEEP(100); // chip eraze time: 100ms
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return 0;
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}
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// program a bunch of bytes "by hand"
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int ProgramBytes(tUartHandle serial_handle, UINT32 address, UINT8* pData, UINT32 size)
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{
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UINT32 base = address & 0xFFF80000; // round down to 512k align
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while (size--)
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{
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WriteByte(serial_handle, base + 0x5555, 0xAA); // enter command mode
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WriteByte(serial_handle, base + 0x2AAA, 0x55);
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WriteByte(serial_handle, base + 0x5555, 0xA0); // byte program command
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WriteByte(serial_handle, address++, *pData++);
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// UART protocol is slow enough such that I don't have to wait 20us here
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}
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return 0;
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} |