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The follow sheet is for the WiFIG25 board, the linux inode row is for the linux.

Pin # CPU pin Primary Description Alternate Description Alternate Description
1 PB11 AD0 A/D input GPIO(43) General purpose I/O PWM0 Pulse Width Modulation
2 PB12 AD1 A/D input GPIO(44) General purpose I/O PWM1 Pulse Width Modulation
3 PB13 AD2 A/D input GPIO(45) General purpose I/O PWM2 Pulse Width Modulation
4 PB14 AD3 A/D input GPIO(46) General purpose I/O PWM3 Pulse Width Modulation
5 ADVREF ADVREF A/D voltage reference        
6 PA30 SDA0 I2C bus Data GPIO(30) General purpose I/O    
7 PA31 SCL0 I2C bus Clock GPIO(31) General purpose I/O    
8 PA0 TXD0 Serial TXD /dev/ttyS1 GPIO(0) General purpose I/O    
9 PA1 RXD0 Serial RXD /dev/ttyS1 GPIO(1) General purpose I/O    
10 PA2 RTS0 Serial RTS /dev/ttyS1 GPIO(2) General purpose I/O    
11 PA3 CTS0 Serial CTS /dev/ttyS1 GPIO(3) General purpose I/O    
12 PA4 GPIO General purpose I/O GPIO(4)      
13 PA5 TXD1 Serial TXD /dev/ttyS2 GPIO(5) General purpose I/O    
14 PA6 RXD1 Serial RXD /dev/ttyS2 GPIO(6) General purpose I/O    
15 PA7 TXD2 Serial TXD /dev/ttyS3 GPIO(7) General purpose I/O    
16 PA8 RXD2 Serial RXD /dev/ttyS3 GPIO(8) General purpose I/O    
17 PA12 MOSI SPI MOSI GPIO(12) General purpose I/O    
18 PA11 MISO SPI MISO GPIO(11) General purpose I/O    
19 PA13 SPCK SPI CLOCK GPIO(13) General purpose I/O    
20 PA14 NPCS0 SPI CS0 GPIO(14) General purpose I/O    
21 GND   Ground line        
22 PB3 1W Bit banging 1-wire bus SPI CS3 SPI CS3 GPIO(35) General purpose I/O
23 USBCP D+ USB 2.0 Host full-speed port C        
24 USBCN D- USB 2.0 Host full-speed port C        
25 PC27 RTS1 Serial RTS /dev/ttyS2 GPIO(91) General purpose I/O    
26 PB0 RTS2 Serial RTS /dev/ttyS3 GPIO(32) General purpose I/O    
27 USBAN D- USB 2.0 Host/Device hi-speed port A        
28 USBAP D+ USB 2.0 Host/Device hi-speed port A        
29 PC18 PWM0 Pulse Width Modulation GPIO(82) General purpose I/O    
30 PC19 PWM1 Pulse Width Modulation GPIO(83) General purpose I/O    
31 PC20 PWM2 Pulse Width Modulation GPIO(84) General purpose I/O    
32 PC21 PWM3 Pulse Width Modulation GPIO(85) General purpose I/O    
33 PC2 TIOA3 TC block PWM0 GPIO(66) General purpose I/O    
34 PC3 TIOB3 TC block PWM1 GPIO(67) General purpose I/O    
35 PC4 TCLK3 TC block CLOCK GPIO(68) General purpose I/O    
36 VDD5V   5V0 power in/out        
37 VDD33   3V3 power out        
38 GND   Ground line        
39 VBAT VBAT RTC battery in        
40 NRST NRST Reset input/output signal (active low)        

Pin # CPU Pin Primary Description      
1 VDD5V   5V0 power in/out      
2 PA9 DRXD Debug serial port      
3 PA10 DTXD Debug serial port      
4 GND   Ground line      

Pin # CPU Pin Primary Description      
1 VDD5V   5V0 power in      
2 USBAN   Data-      
3 USBAP   Data+      
4 ID          
5 GND   Ground line      
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