aerofc: fix documentation about pins

- There's no I2C2, so remove it
  - Fix alignments everywhere in board_config.h
  - Clarify STM32 ADC (not available) and the ADC on the FGPA
  - Fix format on some comments

src/drivers/boards/aerofc-v1/board_config.h

@@ -67,51 +67,47 @@
 /*
  * I2C busses
  *
- * Peripheral   Port     Signal Name               CONN
+ * Peripheral   Port
  * I2C1_SDA     PB9
- * I2C1_SDL     PB8
+ * I2C1_SCL     PB8
- *
- * I2C2_SDA     PB11
- * I2C2_SDL     PB10
  *
  * I2C3_SDA     PC9
- * I2C3_SDL     PA8
+ * I2C3_SCL     PA8
  *
  */
 
 #define PX4_I2C_BUS_EXPANSION	1
-#define PX4_I2C_BUS_ONBOARD		3
+#define PX4_I2C_BUS_ONBOARD	3
 
 #define PX4_I2C_OBDEV_HMC5883	0x1e
 
-#define GPIO_SPI_CS_MPU6500		(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN4)
+#define GPIO_SPI_CS_MPU6500	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN4)
 #define PX4_SPI_BUS_SENSORS	1
-#define PX4_SPIDEV_MPU			1
+#define PX4_SPIDEV_MPU		1
 
 /*
- * ADC channels
+ * STM32 ADC channels
- *
- * These are the channel numbers of the ADCs of the microcontroller that can be used by the Px4 Firmware in the adc driver
- * PC0     VOLTAGE                   JP2-13,14          - 1.84 @16.66  1.67 @15.12 Scale 0.1105
  *
+ * These are the channel numbers of the ADCs of the microcontroller that can
+ * be used by the PX4 Firmware in the adc driver
  */
 #define ADC_CHANNELS 0
 
 /*
- * ADC defines just to not break sensors.cpp build, battery voltage and current
+ * ADC channels: these use the ADC block implemented in the FPGA. There are 5
- * will be read in another way in future.
+ * channels in the FPGA, but only 1 is phisically connected, that's dedicated
+ * for voltage reading.
  */
 #define ADC_BATTERY_VOLTAGE_CHANNEL    1
 #define ADC_BATTERY_CURRENT_CHANNEL    ((uint8_t)(-1))
 
-/* Define Battery 1 Voltage Divider
+/*
- * Use Default for A per V
+ * Define Battery 1 Voltage Divider, using default for A/V
  */
-
 #define BOARD_BATTERY1_V_DIV (9.0f)
 
 #define DIRECT_PWM_OUTPUT_CHANNELS	1
-#define BOARD_HAS_PWM	0
+#define BOARD_HAS_PWM			0
 
 /* USB OTG FS
  *
@@ -119,14 +115,20 @@
  */
 #define GPIO_OTGFS_VBUS (GPIO_INPUT|GPIO_FLOAT|GPIO_SPEED_100MHz|GPIO_OPENDRAIN|GPIO_PORTA|GPIO_PIN9)
 
+/*
+ * GPS
+ */
 #define GPS_DEFAULT_UART_PORT	"/dev/ttyS2"
 
-/* RC Serial port
+/*
+ * RC Serial port
  */
 #define RC_SERIAL_PORT		"/dev/ttyS3"
+/* No invert support */
 #define INVERT_RC_INPUT(_invert_true)		while(0)
 
-/* High-resolution timer
+/*
+ * High-resolution timer
  */
 #define HRT_TIMER		3	/* use timer3 for the HRT */
 #define HRT_TIMER_CHANNEL	4	/* use capture/compare channel */