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[posix] skip 0x00 bytes at the start of the received SPI frame (#10442)

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The SPI interface may receive the garbage bytes 0xff or 0x00 at the
start of the received SPI frame. This commit skips the 0x00 bytes
at the start of the received SPI frame.
This commit is contained in:
Zhanglong Xia
2024-06-26 13:32:39 -04:00
committed by GitHub
parent 975ffd72fc
commit 7252cadb5a
1 changed files with 2 additions and 2 deletions
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src/posix/platform/spi_interface.cpp
+2 -2
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@@ -326,7 +326,7 @@ uint8_t *SpiInterface::GetRealRxFrameStart(uint8_t *aSpiRxFrameBuffer, uint8_t a
uint8_t *start = aSpiRxFrameBuffer;
const uint8_t *end = aSpiRxFrameBuffer + aAlignAllowance;
for (; start != end && start[0] == 0xff; start++)
for (; start != end && ((start[0] == 0xff) || (start[0] == 0x00)); start++)
;
aSkipLength = static_cast<uint16_t>(start - aSpiRxFrameBuffer);
@@ -469,7 +469,7 @@ otError SpiInterface::PushPullSpi(void)
DieNow(OT_EXIT_FAILURE);
}
// Account for misalignment (0xFF bytes at the start)
// Account for misalignment (0xFF or 0x00 bytes at the start)
spiRxFrame = GetRealRxFrameStart(spiRxFrameBuffer, mSpiAlignAllowance, skipAlignAllowanceLength);
{