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k64f: Added SPI block write using DSPI_MasterTransferBlocking 

performance improvements:
naive block writes    3.997Mbps
DSPI block writes    17.809Mbps
pull/4207/head
Christopher Haster 2017-05-18 14:26:21 -05:00
parent c1de19e49e
commit e352f1b7f8
1 changed files with 8 additions and 7 deletions
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15
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/spi_api.c
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@ -130,13 +130,14 @@ int spi_master_write(spi_t *obj, int value)
int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length) {
int total = (tx_length > rx_length) ? tx_length : rx_length;
for (int i = 0; i < total; i++) {
char out = (i < tx_length) ? tx_buffer[i] : 0xff;
char in = spi_master_write(obj, out);
if (i < rx_length) {
rx_buffer[i] = in;
}
}
DSPI_MasterTransferBlocking(spi_address[obj->spi.instance], &(dspi_transfer_t){
.txData = (uint8_t *)tx_buffer,
.rxData = (uint8_t *)rx_buffer,
.dataSize = total,
.configFlags = kDSPI_MasterCtar0 | kDSPI_MasterPcs0 | kDSPI_MasterPcsContinuous,
});
DSPI_ClearStatusFlags(spi_address[obj->spi.instance], kDSPI_RxFifoDrainRequestFlag | kDSPI_EndOfQueueFlag);
return total;
}