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stm32_common/spi: fix receive after transmit-only error #6764

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merged 1 commit into from
Mar 30, 2017
Merged

stm32_common/spi: fix receive after transmit-only error #6764

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1 change: 1 addition & 0 deletions cpu/stm32_common/periph/spi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,7 @@ void spi_transfer_bytes(spi_t bus, spi_cs_t cs, bool cont,
*DR = outbuf[i];
}
/* wait until everything is finished and empty the receive buffer */
while (!(dev(bus)->SR & SPI_SR_TXE)) {}
while (dev(bus)->SR & SPI_SR_BSY) {}
while (dev(bus)->SR & SPI_SR_RXNE) {
dev(bus)->DR; /* we might just read 2 bytes at once here */
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