/*
* 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 prepare_reset() {
snes_reset(1);
delay_ms(1);
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);
}
/* Systick interrupt handler */
void SysTick_Handler(void) {
ticks++;
static int warmup = 0;
static uint16_t sdch_state = 0;
static uint16_t reset_state = 0;
sdch_state = (sdch_state << 1) | SDCARD_DETECT | 0xe000;
if(warmup > WARMUP_TICKS && ((sdch_state == 0xf000) || (sdch_state == 0xefff))) {
sd_changed = 1;
}
reset_state = (reset_state << 1) | get_snes_reset() | 0xe000;
if((reset_state == 0xf000) || (reset_state == 0xefff)) {
reset_pressed = (reset_state == 0xf000);
reset_changed = 1;
}
led_error();
sdn_changed();
SysTick_Hook();
if(warmup <= WARMUP_TICKS) warmup++;
}
uint32_t calc_sram_crc(uint32_t base_addr, uint32_t size) {
uint8_t data;
uint32_t count;
uint32_t crc;
crc=0;
crc_valid=1;
set_mcu_addr(base_addr);
FPGA_SELECT();
FPGA_TX_BYTE(0x88);
for(count=0; count<size; count++) {
FPGA_WAIT_RDY();
data = FPGA_RX_BYTE();
if(get_snes_reset()) {
crc_valid = 0;
break;
}
crc += crc32_update(crc, data);
}
FPGA_DESELECT();
return crc;
}
int msu1_check_reset(void) {
static tick_t rising_ticks;
static uint8_t resbutton=0, resbutton_prev=0;
int result = MSU_RESET_NONE;
resbutton = get_snes_reset();
if(resbutton && !resbutton_prev) { /* push */
rising_ticks = getticks();
} else if(resbutton && resbutton_prev) { /* hold */
if(getticks() > rising_ticks + 99) {
result = MSU_RESET_LONG;
}
} else if(!resbutton && resbutton_prev) { /* release */
if(getticks() < rising_ticks + 99) {
result = MSU_RESET_SHORT;
}
} else {
result = MSU_RESET_NONE;
}
resbutton_prev = resbutton;
return result;
}