attiny, stm32l0: Note that these chips don't support spi duplex

This makes the ms5607 driver use send/recv instead.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

src/attiny/ao_arch_funcs.h

@@ -65,6 +65,8 @@ ao_spi_recv_bus(void *block, uint16_t len);
 #define ao_spi_send(block, len, bus) ao_spi_send_bus(block, len)
 #define ao_spi_recv(block, len, bus) ao_spi_recv_bus(block, len)
 
+#define AO_SPI_DUPLEX	0
+
 void
 ao_spi_init(void);
 

src/stm32l0/ao_arch_funcs.h

@@ -139,8 +139,7 @@ ao_spi_recv_byte(uint8_t spi_index)
 void
 ao_spi_recv(void *block, uint16_t len, uint8_t spi_index);
 
-void
-ao_spi_duplex(const void *out, void *in, uint16_t len, uint8_t spi_index);
+#define AO_SPI_DUPLEX	0
 
 void
 ao_spi_init(void);