6 These notes assume that when the board is placed with the header pins facing up, the bottom right of the board is next to the 8 sets of INPUT pin headers.
7 Inner means between the two rows of header sockets, outer means between the left/right board edges and the header sockets.
10 ### SPI2 / External SPI
17 There are 4 pins, labelled CS1-4 next to a label that reads Ext SPI. The 3rd pin is connected to the flash chip on
18 the bottom right inner of the board. The other pins on the flash chip are wired up to PB3/4/5
26 ssel 1 GPIOB 10 / Ext SPI CS1
27 ssel 2 GPIOB 11 / Ext SPI CS2
28 ssel 3 GPIOB 12 / Ext SPI CS3 - wired up to Slave Select of M25P16 15MBitFlash chip
29 ssel 4 GPIOB 13 / Ext SPI CS4 - not usable since it is used for SPI2 sclk
41 PF10 / CH8 - TIM15_CH2
59 There is space for a MS5611 pressure sensor at the top left inner of the board.
61 There is an I2C socket on the left outer of the board which connects to a PCA9306 I2C level shifter directly opposite (inner).
62 The PCA9306 is not populated on some boards and thus the I2C socket is unusable.
64 There is a CAN socket on the top right outer of the board which connects to a MAX3015 CAN Tranceiver.
65 The MAX3015 is not populated on some boards and thus the CAN socket is unusable.
67 There are some solder pads labelled Ext 1-4 at the top right inner of the board.
74 There are some solder pads labelled ADC0-3 & Diff Press at the top left inner of the board
75 They are connected to the ADC socket at the top left outer of the board
77 PC3 / Diff Press - ADC12_IN9 (Differential Pressure)
78 PC2 / ADC2 - ADC12_IN8
79 PC1 / ADC1 - ADC12_IN7
80 PC0 / ADC0 - ADC12_IN6
82 There is space for a MPXV5004/MPVZ5004 differential pressure sensor, if populated it's analog pin connects to PC3.
84 There are sockets for 5 UARTs labelled USART1-5.
86 There is a socket labelled RX_IN.