setsck
setsck(spi, cpol);
setsck(spi, !cpol);
setsck(spi, cpol);
setsck(spi, !cpol);
setsck(spi, cpol);
setsck(spi, !cpol);
setsck(spi, cpol);
setsck(spi, !cpol);
setsck(spi, spi->mode & SPI_CPOL);
setsck(data, !cpol);
setsck(data, cpol);