diff options
Diffstat (limited to 'os/hal/platforms/LPC214x/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC214x/spi_lld.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/os/hal/platforms/LPC214x/spi_lld.c b/os/hal/platforms/LPC214x/spi_lld.c index 7c3287298..6df0106b2 100644 --- a/os/hal/platforms/LPC214x/spi_lld.c +++ b/os/hal/platforms/LPC214x/spi_lld.c @@ -99,7 +99,7 @@ static void serve_interrupt(SPIDriver *spip) { (void)ssp->SSP_DR;
if (--spip->spd_rxcnt == 0) {
chDbgAssert(spip->spd_txcnt == 0,
- "chSemResetI(), #1", "counter out of synch");
+ "spi_serve_interrupt(), #1", "counter out of synch");
/* Stops the IRQ sources.*/
ssp->SSP_IMSC = 0;
/* Portable SPI ISR code defined in the high level driver, note, it is
@@ -178,7 +178,7 @@ void spi_lld_start(SPIDriver *spip) { spip->spd_ssp->SSP_ICR = ICR_RT | ICR_ROR;
spip->spd_ssp->SSP_CR0 = spip->spd_config->spc_cr0;
spip->spd_ssp->SSP_CPSR = spip->spd_config->spc_cpsr;
- spip->spd_ssp->SSP_CR1 = spip->spd_config->spc_cr1 | CR1_SSE;
+ spip->spd_ssp->SSP_CR1 = CR1_SSE;
}
/**
@@ -191,16 +191,15 @@ void spi_lld_start(SPIDriver *spip) { void spi_lld_stop(SPIDriver *spip) {
if (spip->spd_state != SPI_STOP) {
+ spip->spd_ssp->SSP_CR1 = 0;
+ spip->spd_ssp->SSP_CR0 = 0;
+ spip->spd_ssp->SSP_CPSR = 0;
#if LPC214x_SPI_USE_SSP
if (&SPID1 == spip) {
PCONP = (PCONP & PCALL) & ~PCSPI1;
VICIntEnClear = INTMASK(SOURCE_SPI1);
}
#endif
- spip->spd_ssp->SSP_CR1 = 0;
- spip->spd_ssp->SSP_CR0 = 0;
- spip->spd_ssp->SSP_CPSR = 0;
- PCONP &= ~PCSPI1;
}
}
@@ -318,6 +317,26 @@ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) { spip->spd_ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
}
+/**
+ * @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_ssp->SSP_DR = (uint32_t)frame;
+ while ((spip->spd_ssp->SSP_SR & SR_RNE) == 0)
+ ;
+ return (uint16_t)spip->spd_ssp->SSP_DR;
+}
+
#endif /* CH_HAL_USE_SPI */
/** @} */
|