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SiLabs Pearl: SPI fixes 

Added rx/tx clear before DMA transmit begins. RX DMA descriptor
    fixed
pull/1501/head
jhokajar 2015-12-04 11:13:55 +02:00 committed by Steven Cooreman
parent 81a9dd9031
commit 3fc661944a
1 changed files with 11 additions and 1 deletions
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12
libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/spi_api.c
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@ -877,7 +877,10 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
}
/* Save amount of TX done by DMA */
obj->tx_buff.pos += tx_length;
/* Clear TX registers */
obj->spi.spi->CMD = USART_CMD_CLEARTX;
LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph);
LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_M2P_BYTE(txdata, target_addr, tx_length);
@ -923,11 +926,18 @@ static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int t
break;
}
/* Clear RX registers */
obj->spi.spi->CMD = USART_CMD_CLEARRX;
LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph);
LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_M2P_BYTE(source_addr, rxdata, rx_length);
LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_P2M_BYTE(source_addr, rxdata, rx_length);
if(obj->spi.bits >= 9){
#ifdef USE_UINT16_BUFFER
desc.xfer.size = ldmaCtrlSizeHalf;
#else
desc.xfer.size = ldmaCtrlSizeHalf;
desc.xfer.srcInc = ldmaCtrlSrcIncTwo;
#endif
}
LDMA_StartTransfer(obj->spi.dmaOptionsRX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsRX.dmaCallback.userPtr);
}