atmel-samd: Clear the error bit after the known buffer overflow and be explicit about dst increase.

tannewt · tannewt · commit 8f3c5ebdc82c · 2017-08-03T13:44:31.000-07:00
diff --git a/atmel-samd/shared_dma.c b/atmel-samd/shared_dma.c
@@ -131,6 +131,7 @@ enum status_code shared_dma_write(Sercom* sercom, const uint8_t* buffer, uint32_
         sercom->SPI.DATA.reg;
     }
     sercom->SPI.STATUS.bit.BUFOVF = 1;
+    sercom->SPI.INTFLAG.reg = SERCOM_SPI_INTFLAG_ERROR;
 
     return general_dma_tx.job_status;
 }
@@ -148,6 +149,7 @@ enum status_code shared_dma_read(Sercom* sercom, uint8_t* buffer, uint32_t lengt
     dma_descriptor_get_config_defaults(&descriptor_config);
     descriptor_config.beat_size = DMA_BEAT_SIZE_BYTE;
     descriptor_config.src_increment_enable = false;
+    descriptor_config.dst_increment_enable = true;
     descriptor_config.block_transfer_count = length;
     // DATA register is consistently addressed across all SERCOM modes.
     descriptor_config.source_address = ((uint32_t)&sercom->SPI.DATA.reg);

Original file line number	Diff line number	Diff line change
`@@ -131,6 +131,7 @@ enum status_code shared_dma_write(Sercom* sercom, const uint8_t* buffer, uint32_`
`131`	`131`	`sercom->SPI.DATA.reg;`
`132`	`132`	`}`
`133`	`133`	`sercom->SPI.STATUS.bit.BUFOVF = 1;`
	`134`	`+ sercom->SPI.INTFLAG.reg = SERCOM_SPI_INTFLAG_ERROR;`
`134`	`135`
`135`	`136`	`return general_dma_tx.job_status;`
`136`	`137`	`}`
`@@ -148,6 +149,7 @@ enum status_code shared_dma_read(Sercom* sercom, uint8_t* buffer, uint32_t lengt`
`148`	`149`	`dma_descriptor_get_config_defaults(&descriptor_config);`
`149`	`150`	`descriptor_config.beat_size = DMA_BEAT_SIZE_BYTE;`
`150`	`151`	`descriptor_config.src_increment_enable = false;`
	`152`	`+ descriptor_config.dst_increment_enable = true;`
`151`	`153`	`descriptor_config.block_transfer_count = length;`
`152`	`154`	`// DATA register is consistently addressed across all SERCOM modes.`
`153`	`155`	`descriptor_config.source_address = ((uint32_t)&sercom->SPI.DATA.reg);`