Merge pull request #115 from esden/bmpm2

[native] Check for hardware version by pull-up and -down. Print HW Ve…

src/command.c

@@ -108,7 +108,7 @@ int command_process(target *t, char *cmd)
 
 bool cmd_version(void)
 {
-	gdb_out("Black Magic Probe (Firmware " FIRMWARE_VERSION ")\n");
+	gdb_outf("Black Magic Probe (Firmware " FIRMWARE_VERSION ") (Hardware Version %d)\n", platform_hwversion());
 	gdb_out("Copyright (C) 2015  Black Sphere Technologies Ltd.\n");
 	gdb_out("License GPLv3+: GNU GPL version 3 or later "
 		"<http://gnu.org/licenses/gpl.html>\n\n");

src/platforms/launchpad-icdi/platform.h

@@ -116,4 +116,9 @@ inline static uint8_t gpio_get(uint32_t port, uint8_t pin) {
 
 #define disconnect_usb() do { usbd_disconnect(usbdev,1); nvic_disable_irq(USB_IRQ);} while(0)
 
+static inline int platform_hwversion(void)
+{
+	        return 0;
+}
+
 #endif

src/platforms/libftdi/platform.h

@@ -42,5 +42,10 @@ void platform_buffer_flush(void);
 int platform_buffer_write(const uint8_t *data, int size);
 int platform_buffer_read(uint8_t *data, int size);
 
+static inline int platform_hwversion(void)
+{
+	        return 0;
+}
+
 #endif
 

src/platforms/native/platform.c

@@ -45,13 +45,37 @@ static void setup_vbus_irq(void);
 int platform_hwversion(void)
 {
 	static int hwversion = -1;
+	uint16_t hwversion_pins = GPIO7 | GPIO6 | GPIO5;
+	uint16_t unused_pins = hwversion_pins ^ 0xFFFF;
+
+	/* Only check for version if this is the first time. */
 	if (hwversion == -1) {
+		/* Configure the hardware version pins as input pull-up/down */
 		gpio_set_mode(GPIOB, GPIO_MODE_INPUT,
 				GPIO_CNF_INPUT_PULL_UPDOWN,
-				GPIO7 | GPIO6 | GPIO5);
-		gpio_clear(GPIOB, GPIO7 | GPIO6 | GPIO5);
-		hwversion = gpio_get(GPIOB, GPIO7 | GPIO6 | GPIO5) >> 5;
+				hwversion_pins);
+
+		/* Enable the weak pull up. */
+		gpio_set(GPIOB, hwversion_pins);
+		/* Get all pins that are pulled low in hardware.
+		 * This also sets all the "unused" pins to 1.
+		 */
+		uint16_t pins_negative = gpio_get(GPIOB, hwversion_pins) | unused_pins;
+
+		/* Enable the weak pull down. */
+		gpio_clear(GPIOB, hwversion_pins);
+		/* Get all the pins that are pulled high in hardware. */
+		uint16_t pins_positive = gpio_get(GPIOB, hwversion_pins);
+
+
+		/* Hardware version is the id defined by the pins that are
+		 * asserted low or high by the hardware. This means that pins
+		 * that are left floating are 0 and those that are either
+		 * pulled high or low are 1.
+		 */
+		hwversion = (((pins_positive ^ pins_negative) ^ 0xFFFF) & hwversion_pins) >> 5;
 	}
+
 	return hwversion;
 }
 

src/platforms/swlink/platform.h

@@ -127,6 +127,11 @@
 #define SET_IDLE_STATE(state)	{gpio_set_val(LED_PORT, LED_IDLE_RUN, state);}
 #define SET_ERROR_STATE(x)
 
+static inline int platform_hwversion(void)
+{
+	        return 0;
+}
+
 /* Use newlib provided integer only stdio functions */
 #define sscanf siscanf
 #define sprintf siprintf