C++ (Cpp) _i2c_receive示例

示例#1

文件： i2c.c 项目： daniel-k/RIOT

int i2c_read_bytes(i2c_t dev, uint8_t address, char *data, int length)
{
    I2C_Type *i2c;
    int n = 0;

    switch (dev) {
#if I2C_0_EN

        case I2C_0:
            i2c = I2C_0_DEV;
            break;
#endif

        default:
            return -1;
    }

    if (_i2c_start(i2c, address, I2C_FLAG_READ)) {
        _i2c_reset(i2c);
        return -1;
    }

    n = _i2c_receive(i2c, (uint8_t *)data, length);
    if (n < 0) {
        _i2c_reset(i2c);
        return -1;
    }

    _i2c_stop(i2c);

    return n;
}

示例#2

文件： i2c.c 项目： MichelRottleuthner/RIOT

int i2c_read_regs(i2c_t dev, uint8_t address, uint8_t reg, void *data, int length)
{
    I2C_Type *i2c;
    int n = 0;

    switch (dev) {
#if I2C_0_EN

        case I2C_0:
            i2c = I2C_0_DEV;
            break;
#endif

        default:
            return -1;
    }

    if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) {
        _i2c_reset(i2c);
        return -1;
    }

    /* send reg */
    n = _i2c_transmit(i2c, &reg, 1);

    if (!n) {
        _i2c_stop(i2c);
        return n;
    }

    if (_i2c_restart(i2c, address, I2C_FLAG_READ)) {
        _i2c_reset(i2c);
        return -1;
    }

    n = _i2c_receive(i2c, (uint8_t *)data, length);
    if (n < 0) {
        _i2c_reset(i2c);
        return -1;
    }

    _i2c_stop(i2c);

    return n;
}