mirror of
https://github.com/raphnet/gc_n64_usb-v3
synced 2024-10-31 15:45:09 -04:00
240 lines
5.2 KiB
C
240 lines
5.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include "gcn64lib.h"
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#include "gcn64.h"
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#include "mempak.h"
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#include "mempak_gcn64usb.h"
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#include "../gcn64_protocol.h"
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#include "../requests.h"
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/* __calc_address_crc is from libdragon which is public domain. */
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/**
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* @brief Calculate the 5 bit CRC on a mempak address
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*
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* This function, given an address intended for a mempak read or write, will
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* calculate the CRC on the address, returning the corrected address | CRC.
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*
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* @param[in] address
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* The mempak address to calculate CRC over
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*
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* @return The mempak address | CRC
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*/
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static uint16_t __calc_address_crc( uint16_t address )
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{
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/* CRC table */
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uint16_t xor_table[16] = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x15, 0x1F, 0x0B, 0x16, 0x19, 0x07, 0x0E, 0x1C, 0x0D, 0x1A, 0x01 };
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uint16_t crc = 0;
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int i;
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/* Make sure we have a valid address */
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address &= ~0x1F;
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/* Go through each bit in the address, and if set, xor the right value into the output */
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for( i = 15; i >= 5; i-- )
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{
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/* Is this bit set? */
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if( ((address >> i) & 0x1) )
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{
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crc ^= xor_table[i];
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}
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}
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/* Just in case */
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crc &= 0x1F;
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/* Create a new address with the CRC appended */
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return address | crc;
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}
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/* __calc_data_crc is from libdragon which is public domain. */
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/**
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* @brief Calculate the 8 bit CRC over a 32-byte block of data
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*
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* This function calculates the 8 bit CRC appropriate for checking a 32-byte
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* block of data intended for or retrieved from a mempak.
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*
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* @param[in] data
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* Pointer to 32 bytes of data to run the CRC over
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*
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* @return The calculated 8 bit CRC over the data
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*/
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static uint8_t __calc_data_crc( uint8_t *data )
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{
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uint8_t ret = 0;
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int i,j;
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for( i = 0; i <= 32; i++ )
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{
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for( j = 7; j >= 0; j-- )
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{
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int tmp = 0;
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if( ret & 0x80 )
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{
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tmp = 0x85;
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}
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ret <<= 1;
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if( i < 32 )
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{
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if( data[i] & (0x01 << j) )
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{
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ret |= 0x1;
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}
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}
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ret ^= tmp;
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}
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}
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return ret;
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}
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int gcn64lib_mempak_readBlock(gcn64_hdl_t hdl, unsigned short addr, unsigned char dst[32])
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{
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unsigned char cmd[64];
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//int cmdlen;
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int n;
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uint16_t addr_crc;
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unsigned char crc;
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addr_crc = __calc_address_crc(addr);
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cmd[0] = N64_EXPANSION_READ;
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cmd[1] = addr_crc>>8; // Address high byte
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cmd[2] = addr_crc&0xff; // Address low byte
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n = gcn64lib_rawSiCommand(hdl, 0, cmd, 3, cmd, sizeof(cmd));
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if (n != 33) {
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printf("Hey! %d\n", n);
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return -1;
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}
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memcpy(dst, cmd, 0x20);
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crc = __calc_data_crc(dst);
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if (crc != cmd[32]) {
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fprintf(stderr, "Bad CRC reading address 0x%04x\n", addr);
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return -1;
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}
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return 0x20;
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}
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int gcn64lib_mempak_detect(gcn64_hdl_t hdl)
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{
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unsigned char buf[0x20];
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int res;
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printf("Init 1\n");
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memset(buf, 0xfe, 32);
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res = gcn64lib_expansionWrite(hdl, 0x8000, buf);
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if (res != 0xe1) {
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printf("res: %d\n", res);
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return 0;
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}
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printf("Init 2\n");
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memset(buf, 0x80, 32);
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res = gcn64lib_expansionWrite(hdl, 0x8000, buf);
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if (res != 0xe1) {
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printf("res: %d\n", res);
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return 0;
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}
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return -1;
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}
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int gcn64lib_mempak_writeBlock(gcn64_hdl_t hdl, unsigned short addr, unsigned char data[32])
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{
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return gcn64lib_expansionWrite(hdl, __calc_address_crc(addr), data);
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}
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/**
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* \brief Read a physical mempak
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* \param hdl The Adapter handler
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* \param channel The adapter channel (for multi-port adapters)
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* \param pak Pointer to mempak_structure pointer to store the new mempak
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* \param progressCb Callback to notify read progress (called after each block)
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* \return 0: Success, -1: No mempak, -2: IO/error, -3: Other errors
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*/
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int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **mempak, void (*progressCb)(int cur_addr))
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{
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mempak_structure_t *pak;
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unsigned short addr;
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if (!mempak) {
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return -3;
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}
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if (gcn64lib_mempak_detect(hdl)) {
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return -1;
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}
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pak = calloc(1, sizeof(mempak_structure_t));
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if (!pak) {
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return -3;
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}
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pak->file_format = MPK_FORMAT_MPK;
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for (addr = 0x0000; addr < MEMPAK_MEM_SIZE; addr+= 0x20)
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{
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if (gcn64lib_mempak_readBlock(hdl, addr, &pak->data[addr]) != 0x20) {
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fprintf(stderr, "Error: Short read\n");
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free(pak);
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return -2;
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}
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if (progressCb) {
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progressCb(addr);
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}
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}
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*mempak = pak;
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return 0;
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}
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int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak, void (*progressCb)(int cur_addr))
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{
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unsigned short addr;
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unsigned char readback[0x20];
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int res;
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if (!pak) {
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return -3;
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}
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if (gcn64lib_mempak_detect(hdl)) {
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return -1;
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}
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for (addr = 0x0000; addr < MEMPAK_MEM_SIZE; addr+= 0x20)
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{
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res = gcn64lib_mempak_writeBlock(hdl, addr, &pak->data[addr]);
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if (res < 0) {
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fprintf(stderr, "Write error\n");
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return -2;
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}
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if (0x20 != gcn64lib_mempak_readBlock(hdl, addr, readback)) {
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// TODO : Why not retry?
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fprintf(stderr, "readback failed\n");
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return -2;
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}
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if (memcmp(readback, &pak->data[addr], 0x20)) {
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fprintf(stderr, "Readback compare failed\n");
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return -2;
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}
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if (progressCb) {
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progressCb(addr);
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}
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}
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return 0;
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}
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