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cpu/cc2538: fix spi_transfer_bytes

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PeterKietzmann 2017-01-18 17:53:30 +01:00 committed by Hauke Petersen
parent 9b772a45de
commit 3fa8a5e87c
1 changed files with 7 additions and 11 deletions
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18
cpu/cc2538/periph/spi.c
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@ -139,12 +139,12 @@ void spi_transfer_bytes(spi_t bus, spi_cs_t cs, bool cont,
while (!(dev(bus)->SR & SSI_SR_TNF)) {}
dev(bus)->DR = out_buf[i];
}
/* flush RX FIFO */
while (dev(bus)->SR & SSI_SR_RNE) {
/* flush RX FIFO while busy*/
while ((dev(bus)->SR & SSI_SR_BSY)) {
dev(bus)->DR;
}
}
if (!out_buf) {
else if (!out_buf) { /*TODO this case is currently untested */
size_t in_cnt = 0;
for (size_t i = 0; i < len; i++) {
while (!(dev(bus)->SR & SSI_SR_TNF)) {}
@ -159,18 +159,14 @@ void spi_transfer_bytes(spi_t bus, spi_cs_t cs, bool cont,
}
}
else {
size_t in_cnt = 0;
for (size_t i = 0; i < len; i++) {
while (!(dev(bus)->SR & SSI_SR_TNF)) {}
dev(bus)->DR = out_buf[i];
if (dev(bus)->SR & SSI_SR_RNE) {
in_buf[in_cnt++] = dev(bus)->DR;
}
}
/* get remaining bytes */
while (dev(bus)->SR & SSI_SR_RNE) {
in_buf[in_cnt++] = dev(bus)->DR;
while (!(dev(bus)->SR & SSI_SR_RNE)){}
in_buf[i] = dev(bus)->DR;
}
/* wait until no more busy */
while ((dev(bus)->SR & SSI_SR_BSY)) {}
}
if ((!cont) && (cs != SPI_CS_UNDEF)) {