altos: Add STM32F0 beep and SPI byte API.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 51 insertions, 1 deletions

diff --git a/src/stmf0/ao_arch_funcs.h b/src/stmf0/ao_arch_funcs.h
index 01a20c73..8b6234c4 100644
--- a/src/stmf0/ao_arch_funcs.h
+++ b/src/stmf0/ao_arch_funcs.h
@@ -83,7 +83,57 @@ void
 ao_spi_send_fixed(uint8_t value, uint16_t len, uint8_t spi_index);
 
 void
-ao_spi_send_sync(void *block, uint16_t len, uint8_t spi_index);
+ao_spi_send_sync(const void *block, uint16_t len, uint8_t spi_index);
+
+void
+ao_spi_start_bytes(uint8_t spi_index);
+
+void
+ao_spi_stop_bytes(uint8_t spi_index);
+
+static inline void
+ao_spi_send_byte(uint8_t byte, uint8_t spi_index)
+{
+	struct stm_spi	*stm_spi;
+
+	switch (AO_SPI_INDEX(spi_index)) {
+	case 0:
+		stm_spi = &stm_spi1;
+		break;
+	case 1:
+		stm_spi = &stm_spi2;
+		break;
+	}
+
+	while (!(stm_spi->sr & (1 << STM_SPI_SR_TXE)))
+		;
+	stm_spi->dr = byte;
+	while (!(stm_spi->sr & (1 << STM_SPI_SR_RXNE)))
+		;
+	(void) stm_spi->dr;
+}
+
+static inline uint8_t
+ao_spi_recv_byte(uint8_t spi_index)
+{
+	struct stm_spi	*stm_spi;
+
+	switch (AO_SPI_INDEX(spi_index)) {
+	case 0:
+		stm_spi = &stm_spi1;
+		break;
+	case 1:
+		stm_spi = &stm_spi2;
+		break;
+	}
+
+	while (!(stm_spi->sr & (1 << STM_SPI_SR_TXE)))
+		;
+	stm_spi->dr = 0xff;
+	while (!(stm_spi->sr & (1 << STM_SPI_SR_RXNE)))
+		;
+	return stm_spi->dr;
+}
 
 void
 ao_spi_recv(void *block, uint16_t len, uint8_t spi_index);