Function bm8563_get_datetime

Drivers/bm8563-module/source/bm8563.cpp:55–79

extern "C" {

error_t bm8563_get_datetime(Device* device, Bm8563DateTime* dt) {
    auto* i2c_controller = device_get_parent(device);
    auto address = GET_CONFIG(device)->address;

    // Burst-read 7 registers starting at 0x02:
    // [0]=seconds [1]=minutes [2]=hours [3]=days [4]=weekdays [5]=months [6]=years
    uint8_t buf[7] = {};
    error_t error = i2c_controller_read_register(i2c_controller, address, REG_SECONDS, buf, sizeof(buf), I2C_TIMEOUT_TICKS);
    if (error != ERROR_NONE) return error;

    if (buf[0] & 0x80u) {
        LOG_E(TAG, "Clock integrity compromised (VL flag set) — data unreliable");
        return ERROR_INVALID_STATE;
    }
    dt->second = bcd_to_dec(buf[0] & 0x7Fu); // mask VL flag
    dt->minute = bcd_to_dec(buf[1] & 0x7Fu);
    dt->hour   = bcd_to_dec(buf[2] & 0x3Fu);
    dt->day    = bcd_to_dec(buf[3] & 0x3Fu);
    // buf[4] = weekday — ignored
    dt->month  = bcd_to_dec(buf[5] & 0x1Fu);
    bool century = (buf[5] & 0x80u) != 0;
    dt->year   = static_cast<uint16_t>(2000 + bcd_to_dec(buf[6]) + (century ? 100 : 0));

    return ERROR_NONE;
}

error_t bm8563_set_datetime(Device* device, const Bm8563DateTime* dt) {
    if (dt->year < 2000 || dt->year > 2199 ||