forked from Mirrors/usk
101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
#include "hardware/clocks.h"
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#include "hardware/gpio.h"
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#include "hardware/pio.h"
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#include "pins.h"
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#include "pico/stdlib.h"
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#include "glitch.h"
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#include "misc.h"
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#include "fuses.h"
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#include "board_detect.h"
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bool mariko = true;
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bool board_detected = false;
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// maximum number of retries for boot detection before giving up
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#define BOOT_DETECT_MAX_RETRIES 4
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bool wait_for_boot(int timeout_ms) {
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// retry the entire boot detection sequence up to BOOT_DETECT_MAX_RETRIES times
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for (int retry = 0; retry < BOOT_DETECT_MAX_RETRIES; retry++) {
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absolute_time_t tio_full = make_timeout_time_ms(timeout_ms);
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absolute_time_t tio_cmd1 = tio_full;
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init_glitch_pio();
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reset_cpu();
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uint32_t word=0, last_word=0;
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bool was_read_zero = false;
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bool was_cmd1 = false;
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int reset_attempts = 0;
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while(!time_reached(tio_full)) {
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if (time_reached(tio_cmd1))
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{
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if (reset_attempts > 4)
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{
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// internal timeout, break and retry the whole sequence
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break;
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}
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reset_attempts++;
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reset_cpu();
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tio_cmd1 = tio_full;
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}
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if(!pio_sm_is_rx_fifo_empty(pio1, 0))
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{
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word = pio_sm_get(pio1, 0);
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if (last_word == 0x41000000 && word == 0x00F9) // cmd1 request
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{
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tio_cmd1 = make_timeout_time_ms(20);
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was_cmd1 = true;
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}
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else if (last_word == 0x00F9 && (word >> 24) == 0x3F) // cmd1 responce
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{
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tio_cmd1 = tio_full;
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}
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else if (last_word == 0x51000000 && word == 0x0055) //read block 0
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{
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// OLED models sometimes need more time between block 0 and block 1
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// original was 100ms, increased to 250ms for better OLED compatibility
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tio_full = make_timeout_time_ms(250);
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was_read_zero = true;
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} else if (was_read_zero && last_word == 0x4D000200 && word == 0x00B1) // read status - erista only
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{
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mariko = false;
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} else if (last_word == 0x51000000 && word == 0x0147) // read block 1, can finish now
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{
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deinit_glitch_pio();
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return true;
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}
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last_word = word;
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}
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}
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// properly clean up all state machines before retrying
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// SM 2 (G_DAT0_SM) must also be disabled (0x7 = 0b111 covers SM 0, 1, and 2)
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pio_set_sm_mask_enabled(pio1, 0x7, false);
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// clean up GPIO pins
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for (int i = PIN_CLK; i <= PIN_DAT; i++)
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{
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gpio_deinit(i);
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gpio_disable_pulls(i);
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gpio_disable_input_output(i);
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}
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gpio_deinit(gli_pin());
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// only halt with error if all retries are exhausted
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if (retry == BOOT_DETECT_MAX_RETRIES - 1) {
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if (was_read_zero) {
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halt_with_error(1, 3);
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}
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else if (was_cmd1) {
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halt_with_error(2, 3);
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} else {
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halt_with_error(3, 3);
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}
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}
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// small delay before retrying to let hardware settle
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sleep_ms(50);
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}
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return false;
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}
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