mirror of
https://github.com/exA-Arcadia/exa-io.git
synced 2024-11-24 06:30:11 +01:00
233 lines
8.4 KiB
C
233 lines
8.4 KiB
C
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#include <stdio.h>
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#include "pico/stdlib.h"
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#include <string.h>
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const uint PIN_JVS_RE = 2;
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const uint PIN_JVS_DE = 3;
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const uint PIN_JVS_SENSE_2_5V = 14;
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const uint PIN_JVS_SENSE_0V = 13;
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const uint PIN_SR_DATA = 6;
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const uint PIN_SR_CLK = 5;
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const uint PIN_SR_SH = 4;
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const uint8_t JVS_STATUS_GOOD = 1;
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const uint8_t JVS_REPORT_GOOD = 1;
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const uint8_t JVS_MAX_LEN = 253; // minus two for status and checksum
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uint8_t our_address = 0;
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const char id_str[] = "TD;TD-IO;v1.0;https://github.com/tdaede/td-io";
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const uint8_t input_desc[] = {
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0x01, 2, 12, 0,
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0x02, 2, 0, 0,
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0x00
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};
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void start_transmit() {
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gpio_put(PIN_JVS_RE, 1); // disable receive
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gpio_put(PIN_JVS_DE, 1); // enable transmitter
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}
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void stop_transmit() {
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uart_tx_wait_blocking(uart0);
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gpio_put(PIN_JVS_DE, 0); // disable transmitter
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gpio_put(PIN_JVS_RE, 0); // enable receiver
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}
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void send_message(uint8_t* m, uint8_t msg_len) {
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start_transmit();
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uart_putc(uart0, 0xe0);
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uint8_t checksum = 0;
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uart_putc(uart0, 0);
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checksum += 0;
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uart_putc(uart0, msg_len + 2);
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checksum += msg_len + 2;
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uint8_t status = JVS_STATUS_GOOD;
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uart_putc(uart0, status);
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checksum += status;
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for (int i = 0; i < msg_len; i++) {
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uart_putc(uart0, m[i]);
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checksum += m[i];
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}
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uart_putc(uart0, checksum);
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stop_transmit();
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}
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uint32_t read_switches() {
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uint32_t r;
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gpio_put(PIN_SR_SH, 1);
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busy_wait_us(1);
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for (int i = 0; i < 32; i++) {
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gpio_put(PIN_SR_CLK, 1);
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busy_wait_us(1);
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gpio_put(PIN_SR_CLK, 0);
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busy_wait_us(1);
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r <<= 1;
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r |= gpio_get(PIN_SR_DATA);
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}
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gpio_put(PIN_SR_SH, 0);
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return ~r;
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}
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int main() {
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stdio_init_all();
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uart_init(uart0, 115200);
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uart_set_translate_crlf(uart0, false);
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gpio_set_function(0, GPIO_FUNC_UART);
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gpio_set_function(1, GPIO_FUNC_UART);
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gpio_init(PIN_JVS_RE);
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gpio_put(PIN_JVS_RE, 0); // enable receiver
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gpio_set_dir(PIN_JVS_RE, GPIO_OUT);
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gpio_init(PIN_JVS_DE);
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gpio_put(PIN_JVS_DE, 0); //disable transmitter
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gpio_set_dir(PIN_JVS_DE, GPIO_OUT);
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gpio_init(PIN_JVS_SENSE_2_5V);
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gpio_put(PIN_JVS_SENSE_2_5V, 1); // always appear present
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gpio_set_dir(PIN_JVS_SENSE_2_5V, GPIO_OUT);
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gpio_init(PIN_JVS_SENSE_0V);
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gpio_put(PIN_JVS_SENSE_0V, 0);
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gpio_set_dir(PIN_JVS_SENSE_0V, GPIO_OUT);
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// sr
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gpio_init(PIN_SR_DATA);
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gpio_set_dir(PIN_SR_DATA, GPIO_IN);
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gpio_init(PIN_SR_CLK);
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gpio_put(PIN_SR_CLK, 0);
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gpio_set_dir(PIN_SR_CLK, GPIO_OUT);
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gpio_init(PIN_SR_SH);
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gpio_put(PIN_SR_SH, 0);
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gpio_set_dir(PIN_SR_SH, GPIO_OUT);
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while (true) {
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uint8_t sync = uart_getc(uart0);
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if (sync == 0xe0) {
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uint8_t our_checksum = 0;
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uint8_t node_num = uart_getc(uart0);
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our_checksum += node_num;
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uint8_t length = uart_getc(uart0);
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our_checksum += length;
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uint8_t msg_length = length - 1;
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uint8_t message[256];
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for (int i = 0; i < msg_length; i++) {
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uint8_t c = uart_getc(uart0);
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our_checksum += c;
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message[i] = c;
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}
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uint8_t msg_send[256];
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int o = 0;
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uint8_t status = JVS_STATUS_GOOD;
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uint8_t their_checksum = uart_getc(uart0);
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if (our_checksum == their_checksum) {
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int i = 0;
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while (i < msg_length) {
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if ((msg_length - i) >= 2 && message[i] == 0xf0 && message[i+1] == 0xd9) {
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printf("N: %02x Reset\n", node_num);
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our_address = 0;
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gpio_put(PIN_JVS_SENSE_0V, 0);
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i += 2;
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} else if ((msg_length - i) >= 2 && message[i] == 0xf1) {
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printf("Assign node id N: %02x\n", message[i+1]);
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printf("Assume it is us\n");
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our_address = message[i+1];
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i += 2;
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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gpio_put(PIN_JVS_SENSE_0V, 1);
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} else if ((msg_length - i) >= 1 && message[i] == 0x10) {
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i++;
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printf("Got ID code request\n");
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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strcpy(&msg_send[o], id_str);
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o += strlen(id_str) + 1;
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} else if ((msg_length - i) >= 1 && message[i] == 0x11) {
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i++;
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printf("Got revision request\n");
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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msg_send[o] = 0x13;
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o++;
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} else if ((msg_length - i) >= 1 && message[i] == 0x12) {
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i++;
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printf("Got video revision request\n");
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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msg_send[o] = 0x30;
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o++;
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} else if ((msg_length - i) >= 1 && message[i] == 0x13) {
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i++;
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printf("Got io revision request\n");
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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msg_send[o] = 0x10;
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o++;
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} else if ((msg_length - i) >= 1 && message[i] == 0x14) {
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i++;
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printf("Got input descriptor request\n");
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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memcpy(&msg_send[o], input_desc, sizeof(input_desc));
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o += sizeof(input_desc);
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} else if ((msg_length - i) >= 3 && message[i] == 0x20) {
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int num_players = message[i+1];
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int bytes_per_player = message[i+2];
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i += 3;
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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uint32_t switches = read_switches();
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msg_send[o] = 0x00; // test switches
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o++;
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//printf("Got coin slot request for %02x slots\n", slots);
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for (int player = 0; player < num_players; player++) {
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for (int byte = 0; byte < bytes_per_player; byte++) {
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uint8_t b = 0;
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if ((player == 0) && (byte == 0)) {
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b = switches & 0xFF;
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} else if ((player == 0) && (byte == 1)) {
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b = (switches >> 8) & 0xFF;
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} else if ((player == 1) && (byte == 0)) {
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b = (switches >> 16) & 0xFF;
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} else if ((player == 1) && (byte == 1)) {
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b = (switches >> 24) & 0xFF;
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}
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msg_send[o] = b;
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o++;
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}
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}
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} else if ((msg_length - i) >= 2 && message[i] == 0x21) {
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int slots = message[i+1];
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i += 2;
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msg_send[o] = JVS_REPORT_GOOD;
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o++;
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//printf("Got coin slot request for %02x slots\n", slots);
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for (int slot = 0; slot < slots; slot++) {
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msg_send[o] = 0x00;
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msg_send[o+1] = 0x00;
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o += 2;
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}
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} else {
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printf("Unsupported message: N: %02x L: %02x M: ", node_num, msg_length);
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for (int j = 0; j < msg_length; j++) {
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printf("%02x", message[j]);
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}
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printf("\n");
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}
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}
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if (o > 0) {
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send_message(msg_send, o);
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}
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} else {
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printf("Checksum mismatch: theirs: %02x ours: %02x\n", their_checksum, our_checksum);
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}
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} else {
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//printf("Saw non-sync code %02x\n", sync);
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}
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}
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return 0;
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}
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