458 lines
8.5 KiB
C++
458 lines
8.5 KiB
C++
/*
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Copyright 2016-2017 StapleButter
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "NDS.h"
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#include "SPI.h"
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namespace SPI_Firmware
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{
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u8* Firmware;
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u32 FirmwareLength;
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u32 Hold;
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u8 CurCmd;
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u32 DataPos;
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u8 Data;
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u8 StatusReg;
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u32 Addr;
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u16 CRC16(u8* data, u32 len, u32 start)
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{
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u16 blarg[8] = {0xC0C1, 0xC181, 0xC301, 0xC601, 0xCC01, 0xD801, 0xF001, 0xA001};
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for (u32 i = 0; i < len; i++)
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{
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start ^= data[i];
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for (int j = 0; j < 8; j++)
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{
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if (start & 0x1)
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{
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start >>= 1;
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start ^= (blarg[j] << (7-j));
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}
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else
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start >>= 1;
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}
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}
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return start & 0xFFFF;
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}
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bool VerifyCRC16(u32 start, u32 offset, u32 len, u32 crcoffset)
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{
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u16 crc_stored = *(u16*)&Firmware[crcoffset];
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u16 crc_calced = CRC16(&Firmware[offset], len, start);
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//printf("%04X vs %04X\n", crc_stored, crc_calced);
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return (crc_stored == crc_calced);
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}
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bool Init()
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{
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Firmware = NULL;
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return true;
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}
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void DeInit()
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{
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if (Firmware) delete[] Firmware;
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}
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void Reset()
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{
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if (Firmware) delete[] Firmware;
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Firmware = NULL;
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FILE* f = fopen("firmware.bin", "rb");
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if (!f)
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{
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printf("firmware.bin not found\n");
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// TODO: generate default firmware
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return;
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}
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fseek(f, 0, SEEK_END);
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FirmwareLength = (u32)ftell(f);
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Firmware = new u8[FirmwareLength];
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fseek(f, 0, SEEK_SET);
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fread(Firmware, FirmwareLength, 1, f);
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fclose(f);
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u32 userdata = 0x3FE00;
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if (*(u16*)&Firmware[0x3FF70] == ((*(u16*)&Firmware[0x3FE70] + 1) & 0x7F))
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{
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if (VerifyCRC16(0xFFFF, 0x3FF00, 0x70, 0x3FF72))
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userdata = 0x3FF00;
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}
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// fix touchscreen coords
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*(u16*)&Firmware[userdata+0x58] = 0;
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*(u16*)&Firmware[userdata+0x5A] = 0;
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Firmware[userdata+0x5C] = 1;
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Firmware[userdata+0x5D] = 1;
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*(u16*)&Firmware[userdata+0x5E] = 254<<4;
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*(u16*)&Firmware[userdata+0x60] = 190<<4;
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Firmware[userdata+0x62] = 255;
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Firmware[userdata+0x63] = 191;
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// disable autoboot
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//Firmware[userdata+0x64] &= 0xBF;
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*(u16*)&Firmware[userdata+0x72] = CRC16(&Firmware[userdata], 0x70, 0xFFFF);
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// verify shit
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printf("FW: WIFI CRC16 = %s\n", VerifyCRC16(0x0000, 0x2C, *(u16*)&Firmware[0x2C], 0x2A)?"GOOD":"BAD");
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printf("FW: AP1 CRC16 = %s\n", VerifyCRC16(0x0000, 0x3FA00, 0xFE, 0x3FAFE)?"GOOD":"BAD");
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printf("FW: AP2 CRC16 = %s\n", VerifyCRC16(0x0000, 0x3FB00, 0xFE, 0x3FBFE)?"GOOD":"BAD");
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printf("FW: AP3 CRC16 = %s\n", VerifyCRC16(0x0000, 0x3FC00, 0xFE, 0x3FCFE)?"GOOD":"BAD");
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printf("FW: USER0 CRC16 = %s\n", VerifyCRC16(0xFFFF, 0x3FE00, 0x70, 0x3FE72)?"GOOD":"BAD");
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printf("FW: USER1 CRC16 = %s\n", VerifyCRC16(0xFFFF, 0x3FF00, 0x70, 0x3FF72)?"GOOD":"BAD");
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Hold = 0;
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CurCmd = 0;
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Data = 0;
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StatusReg = 0x00;
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}
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u8 Read()
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{
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return Data;
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}
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void Write(u8 val, u32 hold)
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{
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if (!hold)
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{
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Hold = 0;
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}
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if (hold && (!Hold))
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{
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CurCmd = val;
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Hold = 1;
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Data = 0;
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DataPos = 1;
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Addr = 0;
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//printf("firmware SPI command %02X\n", CurCmd);
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return;
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}
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switch (CurCmd)
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{
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case 0x03: // read
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{
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if (DataPos < 4)
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{
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Addr <<= 8;
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Addr |= val;
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Data = 0;
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//if (DataPos == 3) printf("firmware SPI read %08X\n", Addr);
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}
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else
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{
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if (Addr >= FirmwareLength)
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Data = 0;
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else
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Data = Firmware[Addr];
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Addr++;
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}
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DataPos++;
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}
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break;
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case 0x04: // write disable
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StatusReg &= ~(1<<1);
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Data = 0;
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break;
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case 0x05: // read status reg
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Data = StatusReg;
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break;
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case 0x06: // write enable
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StatusReg |= (1<<1);
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Data = 0;
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break;
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case 0x9F: // read JEDEC ID
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{
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switch (DataPos)
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{
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case 1: Data = 0x20; break;
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case 2: Data = 0x40; break;
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case 3: Data = 0x12; break;
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default: Data = 0; break;
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}
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DataPos++;
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}
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break;
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default:
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printf("unknown firmware SPI command %02X\n", CurCmd);
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break;
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}
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}
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}
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namespace SPI_Powerman
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{
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u32 Hold;
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u32 DataPos;
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u8 Index;
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u8 Data;
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u8 Registers[8];
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u8 RegMasks[8];
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bool Init()
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{
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return true;
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}
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void DeInit()
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{
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}
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void Reset()
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{
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Hold = 0;
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Index = 0;
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Data = 0;
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memset(Registers, 0, sizeof(Registers));
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memset(RegMasks, 0, sizeof(RegMasks));
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Registers[4] = 0x40;
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RegMasks[0] = 0x7F;
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RegMasks[1] = 0x01;
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RegMasks[2] = 0x01;
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RegMasks[3] = 0x03;
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RegMasks[4] = 0x0F;
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}
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u8 Read()
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{
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return Data;
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}
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void Write(u8 val, u32 hold)
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{
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if (!hold)
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{
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Hold = 0;
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}
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if (hold && (!Hold))
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{
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Index = val;
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Hold = 1;
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Data = 0;
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DataPos = 1;
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return;
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}
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if (DataPos == 1)
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{
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if (Index & 0x80)
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{
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Data = Registers[Index & 0x07];
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}
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else
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{
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Registers[Index & 0x07] =
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(Registers[Index & 0x07] & ~RegMasks[Index & 0x07]) |
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(val & RegMasks[Index & 0x07]);
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}
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}
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else
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Data = 0;
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}
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}
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namespace SPI_TSC
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{
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u32 DataPos;
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u8 ControlByte;
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u8 Data;
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u16 ConvResult;
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u16 TouchX, TouchY;
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bool Init()
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{
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return true;
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}
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void DeInit()
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{
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}
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void Reset()
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{
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ControlByte = 0;
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Data = 0;
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ConvResult = 0;
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}
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void SetTouchCoords(u16 x, u16 y)
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{
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// scr.x = (adc.x-adc.x1) * (scr.x2-scr.x1) / (adc.x2-adc.x1) + (scr.x1-1)
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// scr.y = (adc.y-adc.y1) * (scr.y2-scr.y1) / (adc.y2-adc.y1) + (scr.y1-1)
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// adc.x = ((scr.x * ((adc.x2-adc.x1) + (scr.x1-1))) / (scr.x2-scr.x1)) + adc.x1
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// adc.y = ((scr.y * ((adc.y2-adc.y1) + (scr.y1-1))) / (scr.y2-scr.y1)) + adc.y1
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TouchX = x;
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TouchY = y;
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if (y == 0xFFF) return;
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TouchX <<= 4;
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TouchY <<= 4;
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}
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u8 Read()
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{
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return Data;
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}
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void Write(u8 val, u32 hold)
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{
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if (DataPos == 1)
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Data = (ConvResult >> 5) & 0xFF;
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else if (DataPos == 2)
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Data = (ConvResult << 3) & 0xFF;
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else
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Data = 0;
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if (val & 0x80)
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{
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ControlByte = val;
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DataPos = 1;
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switch (ControlByte & 0x70)
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{
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case 0x10: ConvResult = TouchY; break;
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case 0x50: ConvResult = TouchX; break;
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default: ConvResult = 0xFFF; break;
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}
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if (ControlByte & 0x08)
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ConvResult &= 0x0FF0; // checkme
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}
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else
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DataPos++;
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}
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}
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namespace SPI
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{
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u16 Cnt;
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u32 CurDevice;
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bool Init()
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{
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if (!SPI_Firmware::Init()) return false;
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if (!SPI_Powerman::Init()) return false;
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if (!SPI_TSC::Init()) return false;
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return true;
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}
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void DeInit()
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{
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SPI_Firmware::DeInit();
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SPI_Powerman::DeInit();
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SPI_TSC::DeInit();
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}
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void Reset()
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{
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Cnt = 0;
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SPI_Firmware::Reset();
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SPI_Powerman::Reset();
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SPI_TSC::Init();
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}
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void WriteCnt(u16 val)
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{
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Cnt = (Cnt & 0x0080) | (val & 0xCF03);
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if (val & 0x0400) printf("!! CRAPOED 16BIT SPI MODE\n");
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}
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u8 ReadData()
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{
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if (!(Cnt & (1<<15))) return 0;
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switch (Cnt & 0x0300)
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{
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case 0x0000: return SPI_Powerman::Read();
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case 0x0100: return SPI_Firmware::Read();
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case 0x0200: return SPI_TSC::Read();
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default: return 0;
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}
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}
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void WriteData(u8 val)
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{
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if (!(Cnt & (1<<15))) return;
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// TODO: take delays into account
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switch (Cnt & 0x0300)
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{
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case 0x0000: SPI_Powerman::Write(val, Cnt&(1<<11)); break;
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case 0x0100: SPI_Firmware::Write(val, Cnt&(1<<11)); break;
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case 0x0200: SPI_TSC::Write(val, Cnt&(1<<11)); break;
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default: printf("SPI to unknown device %04X %02X\n", Cnt, val); break;
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}
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if (Cnt & (1<<14))
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NDS::SetIRQ(1, NDS::IRQ_SPI);
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}
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}
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