write_GP2Y0.c

bool reserved_addr(uint8_t addr) {
  return (addr & 0x78) == 0 || (addr & 0x78) == 0x78;
}

void scani2c(void) {
  printf("\nI2C Bus Scan\n");
  printf("   0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F\n");

  for (int addr = 0; addr < (1 << 7); ++addr) {
    if (addr % 16 == 0) {
      printf("%02x ", addr);
    }

    // Perform a 1-byte dummy read from the probe address. If a slave
    // acknowledges this address, the function returns the number of bytes
    // transferred. If the address byte is ignored, the function returns
    // -1.

    // Skip over any reserved addresses.
    int ret;
    uint8_t rxdata;
    if (reserved_addr(addr))
      ret = PICO_ERROR_GENERIC;
    else
      ret = i2c_read_blocking(i2c_default, addr, &rxdata, 1, false);

    printf(ret < 0 ? "." : "@");
    printf(addr % 16 == 15 ? "\n" : "  ");
  }
  printf("Done.\n");
}

void write_GP2Y0(void) {
  //# 変更後の デバイスアドレス -> SET_DATAに設定すべき値(上位4bitが書き込む値)
//# 0x40 -> 0x08
//# 0x50 -> 0x0A
//# 0x60 -> 0x0C
//# 0x70 -> 0x0E
#define SET_DATA 0x0c

  int GP2Y0 = 0x40;  //変更前の デバイスアドレス
  int GP2Y_VPP = 2;  // Vppを接続
  const bool LOW = 0;
  const bool HIGH = 1;
  gpio_init(GP2Y_VPP);
  gpio_set_dir(GP2Y_VPP, GPIO_OUT);
  gpio_put(GP2Y_VPP, LOW);

  //<Stage 1> Clock Select(0xEC:R/W)
  const uint8_t s1[] = {0xEC, 0xFF};
  i2c_write_blocking(i2c_default, GP2Y0, s1, 2, false);
  sleep_ms(10);

  gpio_put(GP2Y_VPP, HIGH);
  sleep_ms(10);

  //<Stage 2> E-Fuse(0xC8:R/W)
  const uint8_t s2[] = {0xC8, 0x00};
  i2c_write_blocking(i2c_default, GP2Y0, s2, 2, false);
  sleep_ms(10);

  //<Stage 3> E-Fuse Bit No/ Bank Assign(0xC9:R/W)
  const uint8_t s3[] = {0xC9, 0x45};
  i2c_write_blocking(i2c_default, GP2Y0, s3, 2, false);
  sleep_ms(10);

  //<Stage 4> E-Fuse Program Data(0xCD:R/W)
  const uint8_t s4[] = {0xCD, SET_DATA};
  i2c_write_blocking(i2c_default, GP2Y0, s4, 2, false);
  sleep_ms(10);

  //<Stage 5> E-Fuse Program Enable Bit(0xCA:R/W)
  // 0x00=Disable, 0x01=Enable
  const uint8_t s5[] = {0xCA, 0x01};
  i2c_write_blocking(i2c_default, GP2Y0, s5, 2, false);
  sleep_ms(10);

  //<Stage 6> E-Fuse Program Enable Bit(0xCA:R/W)
  const uint8_t s6[] = {0xCA, 0x00};
  i2c_write_blocking(i2c_default, GP2Y0, s6, 2, false);
  sleep_ms(10);

  gpio_put(GP2Y_VPP, LOW);
  sleep_ms(10);

  //<Stage 7.1> Bank Select(0xEF:R/W)
  const uint8_t s7_1[] = {0xEF, 0x00};
  i2c_write_blocking(i2c_default, GP2Y0, s7_1, 2, false);
  sleep_ms(10);

  //<Stage 7.2>  E-Fuse(0xC8:R/W) bank3のregisterにload
  const uint8_t s7_2[] = {0xC8, 0x40};
  i2c_write_blocking(i2c_default, GP2Y0, s7_2, 2, false);
  sleep_ms(10);

  //<Stage 7.3> E-Fuse(0xC8:R/W)
  const uint8_t s7_3[] = {0xC8, 0x00};
  i2c_write_blocking(i2c_default, GP2Y0, s7_3, 2, false);
  sleep_ms(10);

  //<Stage 8> Software Reset(0xEE:W) 0x06=software reset
  const uint8_t s8[] = {0xEE, 0x06};
  i2c_write_blocking(i2c_default, GP2Y0, s8, 2, false);
  sleep_ms(10);

  /*
    //<Stage 9.1> Clock Select(0xEC:R/W)
    const uint8_t s9_1[] = {0xEC, 0xFF};
    i2c_write_blocking(i2c_default, GP2Y0, s9_1, 2, false);
    sleep_ms(10);

    //<Stage 9.2> Bank Select(0xEF:R/W)
    const uint8_t s9_2[] = {0xEF, 0x03};
    i2c_write_blocking(i2c_default, GP2Y0, s9_2, 2, false);
    sleep_ms(10);

    //<Stage 9.3> 設定したデバイスアドレスの確認
    Wire.beginTransmission(GP2Y0);
    Wire.write(0x27);
    Wire.endTransmission();
    Wire.requestFrom(GP2Y0, 1);
    int readOutData = 0;
    Serial.print("read");
    sleep_ms(100);
    readOutData = Wire.read();
    Serial.println(" done");
    sleep_ms(10);

    //<Stage 9.4> Bank Select(0xEF:R/W)
    Wire.beginTransmission(GP2Y0);
    Wire.write(0xEF);
    Wire.write(0x00);
    Wire.endTransmission();
    sleep_ms(10);

    //<Stage 9.5> Clock Select(0xEC:R/W)
    Wire.beginTransmission(GP2Y0);
    Wire.write(0xEC);
    Wire.write(0x7F);
    Wire.endTransmission();
    sleep_ms(10);
    */
}