diff options
Diffstat (limited to 'os/hal')
| -rw-r--r-- | os/hal/platforms/STM32/spi_lld.c | 20 | ||||
| -rw-r--r-- | os/hal/platforms/STM32/spi_lld.h | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/os/hal/platforms/STM32/spi_lld.c b/os/hal/platforms/STM32/spi_lld.c index be0a117e3..7d4d182bb 100644 --- a/os/hal/platforms/STM32/spi_lld.c +++ b/os/hal/platforms/STM32/spi_lld.c @@ -466,6 +466,26 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) { dma_start(spip);
}
+/**
+ * @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->DR = frame;
+ while ((spip->spd_spi->SR & SPI_SR_RXNE) == 0)
+ ;
+ return spip->spd_spi->DR;
+}
+
#endif /* CH_HAL_USE_SPI */
/** @} */
diff --git a/os/hal/platforms/STM32/spi_lld.h b/os/hal/platforms/STM32/spi_lld.h index effe0337c..54b995a02 100644 --- a/os/hal/platforms/STM32/spi_lld.h +++ b/os/hal/platforms/STM32/spi_lld.h @@ -282,6 +282,7 @@ extern "C" { const void *txbuf, void *rxbuf);
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
+ uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif
|