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altos: Wait for companion to see CS before attempting communcation
companion-delay
author
Keith Packard
<keithp@keithp.com>
Mon, 15 Oct 2012 01:50:45 +0000
(18:50 -0700)
committer
Keith Packard
<keithp@keithp.com>
Mon, 15 Oct 2012 01:50:45 +0000
(18:50 -0700)
The AVR just can't go fast enough to see the CS in time, so pause for
a while.
(rewritten from
f9607fb76c22187396cceb46b745fa1485d4f155
)
Signed-off-by: Keith Packard <keithp@keithp.com>
src/drivers/ao_companion.c
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diff --git
a/src/drivers/ao_companion.c
b/src/drivers/ao_companion.c
index c749adea9de2f2da295bf2aa64f28c9642ed1103..2ed407f1d9b216ea4fa6ed34e9eaa82ead4d3cbe 100644
(file)
--- a/
src/drivers/ao_companion.c
+++ b/
src/drivers/ao_companion.c
@@
-24,11
+24,14
@@
#endif
#define COMPANION_SELECT() do { \
+ uint8_t pause; \
ao_spi_get_bit(AO_COMPANION_CS_PORT, \
AO_COMPANION_CS_PIN, \
AO_COMPANION_CS, \
AO_COMPANION_SPI_BUS, \
AO_SPI_SPEED_200kHz); \
+ for (pause = 0; pause < 100; pause++) \
+ ao_arch_nop(); \
} while (0)
#define COMPANION_DESELECT() do { \