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authorKeith Packard <keithp@keithp.com>2017-04-09 12:54:57 -0700
committerKeith Packard <keithp@keithp.com>2017-04-09 12:54:57 -0700
commit83c1e4e8ca684f555cba252efd3882f811d8e154 (patch)
tree7d0e912e10014c1c810b9a55da5f618c50b61396 /src
parent24cd5dd33ccf65c1b277911c460a89ec2b52e421 (diff)
altos: Document a few more SPI mode bits in VGA driver
Just comment changes Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src')
-rw-r--r--src/drivers/ao_vga.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/drivers/ao_vga.c b/src/drivers/ao_vga.c
index 2d05d522..909e3109 100644
--- a/src/drivers/ao_vga.c
+++ b/src/drivers/ao_vga.c
@@ -139,13 +139,13 @@ ao_vga_init(void)
(0 << STM_SPI_CR1_CRCEN) | /* CRC disabled */
(0 << STM_SPI_CR1_CRCNEXT) |
(1 << STM_SPI_CR1_DFF) |
- (0 << STM_SPI_CR1_RXONLY) |
+ (0 << STM_SPI_CR1_RXONLY) | /* transmit, not receive */
(0 << STM_SPI_CR1_SSM) | /* Software SS handling */
(1 << STM_SPI_CR1_SSI) | /* ... */
(1 << STM_SPI_CR1_LSBFIRST) | /* Little endian */
(1 << STM_SPI_CR1_SPE) | /* Enable SPI unit */
(0 << STM_SPI_CR1_BR) | /* baud rate to pclk/2 */
- (0 << STM_SPI_CR1_MSTR) |
+ (0 << STM_SPI_CR1_MSTR) | /* slave */
(0 << STM_SPI_CR1_CPOL) | /* Format 0 */
(0 << STM_SPI_CR1_CPHA));
stm_spi1.cr2 = ((0 << STM_SPI_CR2_TXEIE) |