enable software knock on PA3 for F407 #105

(cherry picked from commit 5051448a3a648ac0f8ccdc63eff5ecd1e61e6817)

firmware/config/boards/f407-discovery/board.mk

@@ -41,6 +41,8 @@ DDEFS += -DTS_SECONDARY_UxART_PORT=SD3
 
 DDEFS += -DSTM32_I2C_USE_I2C3=TRUE
 
+DDEFS += -DEFI_SOFTWARE_KNOCK=TRUE -DSTM32_ADC_USE_ADC3=TRUE
+
 DDEFS += -DEFI_WS2812=TRUE
 
 ifndef IS_RE_BOOTLOADER

firmware/config/boards/f407-discovery/knock_config.h

@@ -0,0 +1,16 @@
+/**
+ * @file knock_config.h
+ */
+
+#pragma once
+
+// Knock is on ADC3
+#define KNOCK_ADC ADCD3
+
+// knock 1 - pin PA3
+#define KNOCK_ADC_CH1 ADC_CHANNEL_IN3
+#define KNOCK_PIN_CH1 Gpio::A3
+
+// Sample rate & time - depends on the exact MCU
+#define KNOCK_SAMPLE_TIME ADC_SAMPLE_84
+#define KNOCK_SAMPLE_RATE (STM32_PCLK2 / (4 * (84 + 12)))

firmware/config/boards/f407-discovery/prepend.txt

@@ -1,2 +1,3 @@
 ! see also FLEXIBLE_CRITICAL_LED
 #define ts_show_critical_led true
+#define ts_show_software_knock true