RL_GPIO
CSR_WRITE_1(sc, RL_GPIO,
CSR_READ_1(sc, RL_GPIO) | 0x01);
CSR_WRITE_1(sc, RL_GPIO,
CSR_READ_1(sc, RL_GPIO) & ~0x01);
CSR_WRITE_1(sc, RL_GPIO,
CSR_READ_1(sc, RL_GPIO) | 0x01);
CSR_WRITE_1(sc, RL_GPIO,
CSR_READ_1(sc, RL_GPIO) & ~0x01);