diff options
| -rw-r--r-- | atmel-samd/shared_dma.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/atmel-samd/shared_dma.c b/atmel-samd/shared_dma.c index d7063fb6b..6b6274d89 100644 --- a/atmel-samd/shared_dma.c +++ b/atmel-samd/shared_dma.c @@ -106,15 +106,18 @@ enum status_code shared_dma_write(Sercom* sercom, const uint8_t* buffer, uint32_ return status; } - // Wait for the transfer to finish. + // Wait for the dma transfer to finish. while (general_dma_tx.job_status == STATUS_BUSY) {} + // Wait for the SPI transfer to complete. + while (sercom->SPI.INTFLAG.bit.TXC == 0) {} + // This transmit will cause the RX buffer overflow but we're OK with that. - // So, read the garbage data and clear the overflow flag. - sercom->SPI.DATA.reg; - sercom->SPI.DATA.reg; + // So, read the garbage and clear the overflow flag. + while (sercom->SPI.INTFLAG.bit.RXC == 1) { + sercom->SPI.DATA.reg; + } sercom->SPI.STATUS.bit.BUFOVF = 1; - sercom->SPI.DATA.reg; return general_dma_tx.job_status; } @@ -160,5 +163,7 @@ enum status_code shared_dma_read(Sercom* sercom, uint8_t* buffer, uint32_t lengt // Wait for the transfer to finish. while (general_dma_rx.job_status == STATUS_BUSY) {} + + while (sercom->SPI.INTFLAG.bit.RXC == 1) {} return general_dma_rx.job_status; } |