diff options
Diffstat (limited to 'os/hal/platforms/AT91SAM7/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/AT91SAM7/spi_lld.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/os/hal/platforms/AT91SAM7/spi_lld.c b/os/hal/platforms/AT91SAM7/spi_lld.c index 4bb0ea40c..2cd552ebf 100644 --- a/os/hal/platforms/AT91SAM7/spi_lld.c +++ b/os/hal/platforms/AT91SAM7/spi_lld.c @@ -374,6 +374,27 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) { spip->spd_spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
}
+/**
+ * @brief Exchanges one frame using a polled wait.
+ * @details This synchronous function exchanges one frame using a polled
+ * synchronization method. This function is useful when exchanging
+ * small amount of data on high speed channels, usually in this
+ * situation is much more efficient just wait for completion using
+ * polling than suspending the thread waiting for an interrupt.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object
+ * @param[in] frame the data frame to send over the SPI bus
+ * @return The received data frame from the SPI bus.
+ */
+uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
+
+ spip->spd_spi->SPI_CR = AT91C_SPI_SPIEN;
+ spip->spd_spi->SPI_TDR = frame;
+ while ((spip->spd_spi->SPI_SR & AT91C_SPI_RDRF) == 0)
+ ;
+ return spip->spd_spi->SPI_RDR;
+}
+
#endif /* CH_HAL_USE_SPI */
/** @} */
|