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mimxrt/machine_spi: Ignore transfers with len=0.

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It was treated as an error before.  The error surfaced when using the
NINAW10 drivers for WiFi support.  Even if this is a bad behavior of the
NINA driver, machine_spi can be forgiving in that situation.
This commit is contained in:
robert-hh
2023-04-30 13:29:56 +02:00
committed by Damien George
parent d2a02dcee3
commit 14b862f70f
1 changed files with 11 additions and 9 deletions
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20
ports/mimxrt/machine_spi.c
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@@ -240,17 +240,19 @@ STATIC void machine_spi_init(mp_obj_base_t *self_in, size_t n_args, const mp_obj
STATIC void machine_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) { STATIC void machine_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
machine_spi_obj_t *self = (machine_spi_obj_t *)self_in; machine_spi_obj_t *self = (machine_spi_obj_t *)self_in;
// Wait a short while for the previous transfer to finish, but not forever if (len > 0) {
for (volatile int j = 0; (j < 5000) && ((self->spi_inst->SR & kLPSPI_ModuleBusyFlag) != 0); j++) {} // Wait a short while for the previous transfer to finish, but not forever
for (volatile int j = 0; (j < 5000) && ((self->spi_inst->SR & kLPSPI_ModuleBusyFlag) != 0); j++) {}
lpspi_transfer_t masterXfer; lpspi_transfer_t masterXfer;
masterXfer.txData = (uint8_t *)src; masterXfer.txData = (uint8_t *)src;
masterXfer.rxData = (uint8_t *)dest; masterXfer.rxData = (uint8_t *)dest;
masterXfer.dataSize = len; masterXfer.dataSize = len;
masterXfer.configFlags = (self->master_config->whichPcs << LPSPI_MASTER_PCS_SHIFT) | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap; masterXfer.configFlags = (self->master_config->whichPcs << LPSPI_MASTER_PCS_SHIFT) | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap;
if (LPSPI_MasterTransferBlocking(self->spi_inst, &masterXfer) != kStatus_Success) { if (LPSPI_MasterTransferBlocking(self->spi_inst, &masterXfer) != kStatus_Success) {
mp_raise_OSError(EIO); mp_raise_OSError(EIO);
}
} }
} }