From c395c6f73a220cd6da26ff3b48afde8487b6199f Mon Sep 17 00:00:00 2001
From: Michael Tharp <gxti@partiallystapled.com>
Date: Fri, 4 Oct 2013 21:24:53 -0400
Subject: [PATCH] Configure SRST output as open-drain for BMP Mini hardware

---
 src/platforms/native/platform.c | 11 ++++++++---
 src/platforms/native/platform.h |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/platforms/native/platform.c b/src/platforms/native/platform.c
index 44a5793..640ba58 100644
--- a/src/platforms/native/platform.c
+++ b/src/platforms/native/platform.c
@@ -98,10 +98,15 @@ int platform_init(void)
 	 * to release the device from reset if this floats. */
 	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
 			GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
-	/* Enable SRST output */
-	gpio_set_val(SRST_PORT, SRST_PIN, platform_hwversion() > 0);
+	/* Enable SRST output. Original uses a NPN to pull down, so setting the
+	 * output HIGH asserts. Mini is directly connected so use open drain output
+	 * and set LOW to assert.
+	 */
+	platform_srst_set_val(false);
 	gpio_set_mode(SRST_PORT, GPIO_MODE_OUTPUT_50_MHZ,
-			GPIO_CNF_OUTPUT_PUSHPULL,
+			(platform_hwversion() == 0
+				? GPIO_CNF_OUTPUT_PUSHPULL
+				: GPIO_CNF_OUTPUT_OPENDRAIN),
 			SRST_PIN);
 
         /* Enable internal pull-up on PWR_BR so that we don't drive
diff --git a/src/platforms/native/platform.h b/src/platforms/native/platform.h
index 40dd620..20d1510 100644
--- a/src/platforms/native/platform.h
+++ b/src/platforms/native/platform.h
@@ -220,3 +220,4 @@ static inline uint16_t _gpio_get(uint32_t gpioport, uint16_t gpios)
 #define disconnect_usb() gpio_set_mode(USB_PU_PORT, GPIO_MODE_INPUT, 0, USB_PU_PIN);
 void assert_boot_pin(void);
 void setup_vbus_irq(void);
+void platform_srst_set_val(bool assert);