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mimxrt10xx: Factor out "transfer_common" 

.. and set the "MasterPcsContinuous" flag, which removes some of the
gap between bytes of a single SPI transaction
This commit is contained in:
Jeff Epler 2021-03-25 09:03:42 -05:00
parent ffb70a8737
commit 1d48054aea
1 changed files with 18 additions and 28 deletions
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46
ports/mimxrt10xx/common-hal/busio/SPI.c
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@ -283,6 +283,21 @@ void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
self->has_lock = false; self->has_lock = false;
} }
static status_t transfer_common(busio_spi_obj_t *self, lpspi_transfer_t *xfer) {
xfer->configFlags = kLPSPI_MasterPcsContinuous;
status_t status;
int retries = MAX_SPI_BUSY_RETRIES;
do {
status = LPSPI_MasterTransferBlocking(self->spi, xfer);
} while (status == kStatus_LPSPI_Busy && --retries > 0);
if (status != kStatus_Success) {
printf("%s: status %ld\r\n", __func__, status);
}
return status;
}
bool common_hal_busio_spi_write(busio_spi_obj_t *self, bool common_hal_busio_spi_write(busio_spi_obj_t *self,
const uint8_t *data, size_t len) { const uint8_t *data, size_t len) {
if (len == 0) { if (len == 0) {
@ -295,17 +310,8 @@ bool common_hal_busio_spi_write(busio_spi_obj_t *self,
lpspi_transfer_t xfer = { 0 }; lpspi_transfer_t xfer = { 0 };
xfer.txData = (uint8_t *)data; xfer.txData = (uint8_t *)data;
xfer.dataSize = len; xfer.dataSize = len;
xfer.configFlags = kLPSPI_MasterPcs0;
status_t status; status_t status = transfer_common(self, &xfer);
int retries = MAX_SPI_BUSY_RETRIES;
do {
status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
} while (status == kStatus_LPSPI_Busy && --retries > 0);
if (status != kStatus_Success) {
printf("%s: status %ld\r\n", __func__, status);
}
return status == kStatus_Success; return status == kStatus_Success;
} }
@ -325,15 +331,7 @@ bool common_hal_busio_spi_read(busio_spi_obj_t *self,
xfer.rxData = data; xfer.rxData = data;
xfer.dataSize = len; xfer.dataSize = len;
status_t status; status_t status = transfer_common(self, &xfer);
int retries = MAX_SPI_BUSY_RETRIES;
do {
status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
} while (status == kStatus_LPSPI_Busy && --retries > 0);
if (status != kStatus_Success) {
printf("%s: status %ld\r\n", __func__, status);
}
return status == kStatus_Success; return status == kStatus_Success;
} }
@ -353,15 +351,7 @@ bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, const uint8_t *data_ou
xfer.rxData = data_in; xfer.rxData = data_in;
xfer.dataSize = len; xfer.dataSize = len;
status_t status; status_t status = transfer_common(self, &xfer);
int retries = MAX_SPI_BUSY_RETRIES;
do {
status = LPSPI_MasterTransferBlocking(self->spi, &xfer);
} while (status == kStatus_LPSPI_Busy && --retries > 0);
if (status != kStatus_Success) {
printf("%s: status %ld\r\n", __func__, status);
}
return status == kStatus_Success; return status == kStatus_Success;
} }