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- /* sd2snes - SD card based universal cartridge for the SNES
- Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
- AVR firmware portion
- Inspired by and based on code from sd2iec, written by Ingo Korb et al.
- See sdcard.c|h, config.h.
- FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
- see ff.c|h.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; version 2 of the License only.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- snes.c: SNES hardware control and monitoring
- */
- #include <arm/NXP/LPC17xx/LPC17xx.h>
- #include "bits.h"
- #include "config.h"
- #include "uart.h"
- #include "snes.h"
- #include "memory.h"
- #include "fileops.h"
- #include "ff.h"
- #include "led.h"
- #include "smc.h"
- #include "timer.h"
- #include "cli.h"
- #include "fpga.h"
- #include "fpga_spi.h"
- uint8_t initloop=1;
- uint32_t saveram_crc, saveram_crc_old;
- extern snes_romprops_t romprops;
- volatile int reset_changed;
- volatile int reset_pressed;
- void prepare_reset() {
- snes_reset(1);
- delay_ms(SNES_RESET_PULSELEN_MS);
- if(romprops.ramsize_bytes && fpga_test() == FPGA_TEST_TOKEN) {
- writeled(1);
- save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
- writeled(0);
- }
- rdyled(1);
- readled(1);
- writeled(1);
- snes_reset(0);
- while(get_snes_reset());
- snes_reset(1);
- fpga_dspx_reset(1);
- delay_ms(200);
- }
- void snes_init() {
- /* put reset level on reset pin */
- BITBAND(SNES_RESET_REG->FIOCLR, SNES_RESET_BIT) = 1;
- /* reset the SNES */
- snes_reset(1);
- }
- void snes_reset_pulse() {
- snes_reset(1);
- delay_ms(SNES_RESET_PULSELEN_MS);
- snes_reset(0);
- }
- /*
- * sets the SNES reset state.
- *
- * state: put SNES in reset state when 1, release when 0
- */
- void snes_reset(int state) {
- BITBAND(SNES_RESET_REG->FIODIR, SNES_RESET_BIT) = state;
- }
- /*
- * gets the SNES reset state.
- *
- * returns: 1 when reset, 0 when not reset
- */
- uint8_t get_snes_reset() {
- return !BITBAND(SNES_RESET_REG->FIOPIN, SNES_RESET_BIT);
- }
- /*
- * SD2SNES main loop.
- * monitors SRAM changes and other things
- */
- uint32_t diffcount = 0, samecount = 0, didnotsave = 0;
- uint8_t sram_valid = 0;
- void snes_main_loop() {
- if(!romprops.ramsize_bytes)return;
- if(initloop) {
- saveram_crc_old = calc_sram_crc(SRAM_SAVE_ADDR, romprops.ramsize_bytes);
- initloop=0;
- }
- saveram_crc = calc_sram_crc(SRAM_SAVE_ADDR, romprops.ramsize_bytes);
- sram_valid = sram_reliable();
- if(crc_valid && sram_valid) {
- if(saveram_crc != saveram_crc_old) {
- if(samecount) {
- diffcount=1;
- } else {
- diffcount++;
- didnotsave++;
- }
- samecount=0;
- }
- if(saveram_crc == saveram_crc_old) {
- samecount++;
- }
- if(diffcount>=1 && samecount==5) {
- printf("SaveRAM CRC: 0x%04lx; saving\n", saveram_crc);
- writeled(1);
- save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
- writeled(0);
- didnotsave=0;
- }
- if(didnotsave>50) {
- printf("periodic save (sram contents keep changing...)\n");
- diffcount=0;
- writeled(1);
- save_sram(file_lfn, romprops.ramsize_bytes, SRAM_SAVE_ADDR);
- didnotsave=0;
- writeled(1);
- }
- saveram_crc_old = saveram_crc;
- }
- printf("crc=%lx crc_valid=%d sram_valid=%d diffcount=%ld samecount=%ld, didnotsave=%ld\n", saveram_crc, crc_valid, sram_valid, diffcount, samecount, didnotsave);
- }
- /*
- * SD2SNES menu loop.
- * monitors menu selection. return when selection was made.
- */
- uint8_t menu_main_loop() {
- uint8_t cmd = 0;
- sram_writebyte(0, SRAM_CMD_ADDR);
- while(!cmd) {
- if(!get_snes_reset()) {
- while(!sram_reliable())printf("hurr\n");
- cmd = sram_readbyte(SRAM_CMD_ADDR);
- }
- if(get_snes_reset()) {
- cmd = 0;
- }
- sleep_ms(20);
- cli_entrycheck();
- }
- return cmd;
- }
- void get_selected_name(uint8_t* fn) {
- uint32_t addr;
- addr = sram_readlong(SRAM_PARAM_ADDR);
- printf("fd addr=%lx\n", addr);
- sram_readblock(fn, addr + 7 + SRAM_MENU_ADDR, 256);
- }
- void snes_bootprint(void* msg) {
- sram_writeblock(msg, SRAM_CMD_ADDR, 33);
- }
- void snes_menu_errmsg(int err, void* msg) {
- sram_writeblock(msg, SRAM_CMD_ADDR+1, 64);
- sram_writebyte(err, SRAM_CMD_ADDR);
- }
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