writel(AT91_SPI_TXTEN + AT91_SPI_RXTEN, AT91_BASE_SPI + AT91_SPI_PTCR);
while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_RXBUFF) &&
writel(AT91_SPI_TXTEN + AT91_SPI_RXTEN, AT91_BASE_SPI + AT91_SPI_PTCR);
while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_RXBUFF) &&