Teo-CD
4e11af1da0
The EEPROM in the cartridges support 'Fast I²C' at 400kHz. Testing it out, it seems to work fine despite the high pull-ups, so update the Arduino code to enjoy the 4x speed-up !
118 lines
2.9 KiB
C++
118 lines
2.9 KiB
C++
#include <Wire.h>
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#include <inttypes.h>
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static const int eeprom_addr = 0b1010000;
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// Send a two bytes address via I²C which selects an address within the EEPROM.
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void write_addr(uint16_t addr) {
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Wire.write((uint8_t)(addr >> 8));
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Wire.write((uint8_t)addr);
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}
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void write_page(uint8_t page[128], uint16_t page_addr) {
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uint8_t bytes_written = 0;
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for (int i = 0; i < 5; i++) {
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int ret;
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int write_bytes = min(128 - bytes_written, 30);
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do {
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Wire.beginTransmission(eeprom_addr);
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write_addr(page_addr + bytes_written);
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Wire.write(page + bytes_written, write_bytes);
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ret = Wire.endTransmission();
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delay(5);
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} while (ret != 0);
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bytes_written += write_bytes;
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}
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}
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bool check_sumcomplement(uint8_t data[128], uint16_t checksum) {
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uint16_t sum = 0;
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for (int i = 0; i<128; i += 2) {
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sum += (data[i+1] << 8) | data[i];
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}
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sum += checksum;
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return !sum;
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}
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volatile uint8_t pageData[128] = {};
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volatile uint16_t pageChecksum = 0;
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volatile uint16_t pageAddr = 0;
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volatile bool pageOk = false;
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volatile bool reicivingCart = false;
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volatile uint32_t last_page_update = 0;
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void setup() {
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Serial.begin(115200);
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pinMode(LED_BUILTIN, OUTPUT);
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Wire.begin();
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Wire.setClock(400000);
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}
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void loop() {
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if (reicivingCart && millis() - last_page_update > 1000) {
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Serial.print("TO");
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reicivingCart = false;
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pageOk = false;
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pageAddr = 0;
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digitalWrite(LED_BUILTIN, HIGH);
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delay(500);
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digitalWrite(LED_BUILTIN, LOW);
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delay(500);
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digitalWrite(LED_BUILTIN, HIGH);
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delay(500);
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digitalWrite(LED_BUILTIN, LOW);
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}
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if (pageOk) {
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pageOk = false;
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bool pageValid = check_sumcomplement((uint8_t *)pageData, pageChecksum);
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Serial.print(pageValid ? "ACK" : "NAK");
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if (pageValid) {
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write_page(pageData, pageAddr);
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pageAddr += 128;
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}
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/* for (int i = 0; i<128; i++) {
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if (i%16 == 0)
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Serial.println();
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Serial.print(pageData[i], HEX);
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Serial.print(" ");
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}
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Serial.println();
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Serial.println(pageChecksum, HEX);*/
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Serial.print("OK");
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}
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}
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void serialEvent() {
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static size_t read = 0;
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digitalWrite(LED_BUILTIN, HIGH);
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if (Serial.available() == 5) {
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char control[4] = {};
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Serial.readBytesUntil('\n', control, 4);
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Serial.read(); /* Drop the '\n' */
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if (!strncmp(control, "CART", 4)) {
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reicivingCart = true;
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Serial.print("OK");
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} else if (!strncmp(control, "DONE", 4)) {
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reicivingCart = false;
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} else {
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Serial.print("KO");
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}
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pageOk = false;
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pageAddr = 0;
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read = 0;
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}
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while (reicivingCart && Serial.available() && read < 128) {
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read += Serial.readBytes((char *)pageData+read, min(128-read, 64));
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}
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if (reicivingCart && read >= 128) {
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pageOk = true;
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Serial.readBytes((char*)&pageChecksum, 2);
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read = 0;
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}
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digitalWrite(LED_BUILTIN, LOW);
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last_page_update = millis();
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}
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