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Implement queuing of SPI request segments

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This commit is contained in:
Steve Evans 2022-01-01 02:31:18 +00:00
parent 5ef34f79d5
commit 44e45ddc84
1 changed files with 7 additions and 17 deletions
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24
src/main/drivers/bus_spi.c
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@ -706,14 +706,13 @@ uint8_t spiGetExtDeviceCount(const extDevice_t *dev)
void spiSequence(const extDevice_t *dev, busSegment_t *segments)
{
busDevice_t *bus = dev->bus;
busSegment_t *queuedEndSegments[NUM_QUEUE_SEGS];
uint8_t queuedEndSegmentsIndex = 0;
ATOMIC_BLOCK(NVIC_PRIO_MAX) {
if (spiIsBusy(dev)) {
busSegment_t *endSegment;
// Defer this transfer to be triggered upon completion of the current transfer
// Find the last segment of the current transfer
for (endSegment = segments; endSegment->len; endSegment++);
@ -725,27 +724,18 @@ void spiSequence(const extDevice_t *dev, busSegment_t *segments)
for (; endCmpSegment->len; endCmpSegment++);
if (endCmpSegment == endSegment) {
// Attempt to use the new segment list twice in the same queue. Abort.
return;
}
for (uint8_t n = 0; n < queuedEndSegmentsIndex; n++) {
if (endCmpSegment == queuedEndSegments[n]) {
// Attempt to use the same segment list twice in the same queue. Abort.
return;
}
}
queuedEndSegments[queuedEndSegmentsIndex++] = endCmpSegment;
if (queuedEndSegmentsIndex == NUM_QUEUE_SEGS) {
// Queue is too long. Abort.
/* Attempt to use the new segment list twice in the same queue. Abort.
* Note that this can only happen with non-blocking transfers so drivers must take
* care to avoid this.
* */
return;
}
if (endCmpSegment->txData == NULL) {
// End of the segment list queue reached
break;
} else {
// Follow the link to the next queued segment list
endCmpSegment = (busSegment_t *)endCmpSegment->rxData;
}
}