altos: Use new ao_spi_speed inline to set SPI speeds using spec'd frequencies

[fw/altos] / src / stm / ao_arch_funcs.h

diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h
index 5c8d990b22a5462395735aa9134cbcbfac13c3f2..8f4f6cd4ce9e70658a64a352ab81b7a3ca015df2 100644 (file)
--- a/src/stm/ao_arch_funcs.h
+++ b/src/stm/ao_arch_funcs.h
@@ -24,20 +24,26 @@
 
 /* PCLK is set to 16MHz (HCLK 32MHz, APB prescaler 2) */
 
-#define AO_SPI_SPEED_8MHz      STM_SPI_CR1_BR_PCLK_2
-#define AO_SPI_SPEED_4MHz      STM_SPI_CR1_BR_PCLK_4
-#define AO_SPI_SPEED_2MHz      STM_SPI_CR1_BR_PCLK_8
-#define AO_SPI_SPEED_1MHz      STM_SPI_CR1_BR_PCLK_16
-#define AO_SPI_SPEED_500kHz    STM_SPI_CR1_BR_PCLK_32
-#define AO_SPI_SPEED_250kHz    STM_SPI_CR1_BR_PCLK_64
-#define AO_SPI_SPEED_125kHz    STM_SPI_CR1_BR_PCLK_128
-#define AO_SPI_SPEED_62500Hz   STM_SPI_CR1_BR_PCLK_256
+//#define AO_SPI_SPEED_8MHz    STM_SPI_CR1_BR_PCLK_2   /* too fast to use safely */
+#define _AO_SPI_SPEED_4MHz     STM_SPI_CR1_BR_PCLK_4
+#define _AO_SPI_SPEED_2MHz     STM_SPI_CR1_BR_PCLK_8
+#define _AO_SPI_SPEED_1MHz     STM_SPI_CR1_BR_PCLK_16
+#define _AO_SPI_SPEED_500kHz   STM_SPI_CR1_BR_PCLK_32
+#define _AO_SPI_SPEED_250kHz   STM_SPI_CR1_BR_PCLK_64
+#define _AO_SPI_SPEED_125kHz   STM_SPI_CR1_BR_PCLK_128
+#define _AO_SPI_SPEED_62500Hz  STM_SPI_CR1_BR_PCLK_256
 
-#define AO_SPI_SPEED_FAST      AO_SPI_SPEED_8MHz
-
-/* Companion bus wants something no faster than 200kHz */
-
-#define AO_SPI_SPEED_200kHz    AO_SPI_SPEED_125kHz
+static inline uint32_t
+ao_spi_speed(uint32_t hz)
+{
+       if (hz >= 4000000) return _AO_SPI_SPEED_4MHz;
+       if (hz >= 2000000) return _AO_SPI_SPEED_2MHz;
+       if (hz >= 1000000) return _AO_SPI_SPEED_1MHz;
+       if (hz >=  500000) return _AO_SPI_SPEED_500kHz;
+       if (hz >=  250000) return _AO_SPI_SPEED_250kHz;
+       if (hz >=  125000) return _AO_SPI_SPEED_125kHz;
+       return _AO_SPI_SPEED_62500Hz;
+}
 
 #define AO_SPI_CPOL_BIT                4
 #define AO_SPI_CPHA_BIT                5
@@ -151,8 +157,6 @@ 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);
 
-extern uint16_t        ao_spi_speed[STM_NUM_SPI];
-
 void
 ao_spi_init(void);