HardwareSPI: Add pin accessors.

2 files changed, 102 insertions, 40 deletions

diff --git a/wirish/comm/HardwareSPI.cpp b/wirish/comm/HardwareSPI.cpp
index 25513ee..2527a01 100644
--- a/wirish/comm/HardwareSPI.cpp
+++ b/wirish/comm/HardwareSPI.cpp
@@ -33,18 +33,46 @@
 
 #include "timer.h"
 #include "util.h"
+#include "rcc.h"
 
 #include "wirish.h"
 #include "boards.h"
 
+struct spi_pins {
+    uint8 nss;
+    uint8 sck;
+    uint8 miso;
+    uint8 mosi;
+};
+
+static const spi_pins* dev_to_spi_pins(spi_dev *dev);
+
 static void enable_device(spi_dev *dev,
                           bool as_master,
                           SPIFrequency frequency,
                           spi_cfg_flag endianness,
                           spi_mode mode);
 
+static const spi_pins board_spi_pins[] __FLASH__ = {
+    {BOARD_SPI1_NSS_PIN,
+     BOARD_SPI1_SCK_PIN,
+     BOARD_SPI1_MISO_PIN,
+     BOARD_SPI1_MOSI_PIN},
+    {BOARD_SPI2_NSS_PIN,
+     BOARD_SPI2_SCK_PIN,
+     BOARD_SPI2_MISO_PIN,
+     BOARD_SPI2_MOSI_PIN},
+#ifdef STM32_HIGH_DENSITY
+    {BOARD_SPI3_NSS_PIN,
+     BOARD_SPI3_SCK_PIN,
+     BOARD_SPI3_MISO_PIN,
+     BOARD_SPI3_MOSI_PIN},
+#endif
+};
+
+
 /*
- * Constructor, public methods
+ * Constructor
  */
 
 HardwareSPI::HardwareSPI(uint32 spi_num) {
@@ -65,6 +93,10 @@ HardwareSPI::HardwareSPI(uint32 spi_num) {
     }
 }
 
+/*
+ * Set up/tear down
+ */
+
 void HardwareSPI::begin(SPIFrequency frequency, uint32 bitOrder, uint32 mode) {
     if (mode >= 4) {
         ASSERT(0);
@@ -111,6 +143,10 @@ void HardwareSPI::end(void) {
     spi_peripheral_disable(this->spi_d);
 }
 
+/*
+ * I/O
+ */
+
 uint8 HardwareSPI::read(void) {
     uint8 buf[1];
     this->read(buf, 1);
@@ -143,6 +179,26 @@ uint8 HardwareSPI::transfer(uint8 byte) {
 }
 
 /*
+ * Pin accessors
+ */
+
+uint8 HardwareSPI::misoPin(void) {
+    return dev_to_spi_pins(this->spi_d)->miso;
+}
+
+uint8 HardwareSPI::mosiPin(void) {
+    return dev_to_spi_pins(this->spi_d)->mosi;
+}
+
+uint8 HardwareSPI::sckPin(void) {
+    return dev_to_spi_pins(this->spi_d)->sck;
+}
+
+uint8 HardwareSPI::nssPin(void) {
+    return dev_to_spi_pins(this->spi_d)->nss;
+}
+
+/*
  * Deprecated functions
  */
 
@@ -175,6 +231,17 @@ uint8 HardwareSPI::recv(void) {
 static void configure_gpios(spi_dev *dev, bool as_master);
 static spi_baud_rate determine_baud_rate(spi_dev *dev, SPIFrequency freq);
 
+static const spi_pins* dev_to_spi_pins(spi_dev *dev) {
+    switch (dev->clk_id) {
+    case RCC_SPI1: return board_spi_pins;
+    case RCC_SPI2: return board_spi_pins + 1;
+#ifdef STM32_HIGH_DENSITY
+    case RCC_SPI3: return board_spi_pins + 2;
+#endif
+    default:       return NULL;
+    }
+}
+
 /* Enables the device in master or slave full duplex mode.  If you
  * change this code, you must ensure that appropriate changes are made
  * to HardwareSPI::end(). */
@@ -202,47 +269,10 @@ static void disable_pwm(const stm32_pin_info *i) {
     }
 }
 
-typedef struct spi_pins {
-    uint8 nss;
-    uint8 sck;
-    uint8 miso;
-    uint8 mosi;
-} spi_pins;
-
 static void configure_gpios(spi_dev *dev, bool as_master) {
-    const spi_pins spi_pin_config[] = {
-        {BOARD_SPI1_NSS_PIN,
-         BOARD_SPI1_SCK_PIN,
-         BOARD_SPI1_MISO_PIN,
-         BOARD_SPI1_MOSI_PIN},
-        {BOARD_SPI2_NSS_PIN,
-         BOARD_SPI2_SCK_PIN,
-         BOARD_SPI2_MISO_PIN,
-         BOARD_SPI2_MOSI_PIN},
-#ifdef STM32_HIGH_DENSITY
-        {BOARD_SPI3_NSS_PIN,
-         BOARD_SPI3_SCK_PIN,
-         BOARD_SPI3_MISO_PIN,
-         BOARD_SPI3_MOSI_PIN},
-#endif
-    };
+    const spi_pins *pins = dev_to_spi_pins(dev);
 
-    const spi_pins *pins;
-
-    switch (dev->clk_id) {
-    case RCC_SPI1:
-        pins = &spi_pin_config[0];
-        break;
-    case RCC_SPI2:
-        pins = &spi_pin_config[1];
-        break;
-#ifdef STM32_HIGH_DENSITY
-    case RCC_SPI3:
-        pins = &spi_pin_config[2];
-        break;
-#endif
-    default:
-        ASSERT(0);
+    if (!pins) {
         return;
     }
 
diff --git a/wirish/comm/HardwareSPI.h b/wirish/comm/HardwareSPI.h
index 23fada2..d138910 100644
--- a/wirish/comm/HardwareSPI.h
+++ b/wirish/comm/HardwareSPI.h
@@ -75,6 +75,10 @@ public:
      */
     HardwareSPI(uint32 spiPortNumber);
 
+    /*
+     * Set up/tear down
+     */
+
     /**
      * @brief Turn on a SPI port and set its GPIO pin modes for use as master.
      *
@@ -112,6 +116,10 @@ public:
      */
     void end(void);
 
+    /*
+     * I/O
+     */
+
     /**
      * @brief Return the next unread byte.
      *
@@ -152,6 +160,30 @@ public:
      */
     uint8 transfer(uint8 data);
 
+    /*
+     * Pin accessors
+     */
+
+    /**
+     * @brief Return the number of the MISO (master in, slave out) pin
+     */
+    uint8 misoPin(void);
+
+    /**
+     * @brief Return the number of the MOSI (master out, slave in) pin
+     */
+    uint8 mosiPin(void);
+
+    /**
+     * @brief Return the number of the SCK (serial clock) pin
+     */
+    uint8 sckPin(void);
+
+    /**
+     * @brief Return the number of the NSS (slave select) pin
+     */
+    uint8 nssPin(void);
+
     /* -- The following methods are deprecated --------------------------- */
 
     /**