Utilisez les ports GPIO
Wiki du fabricant : http://www.acmesystems.it/foxg20/doku.php?id=hw:foxg20pinout
Le CPU AT91SM9G20 utilisé sur la FOX Board G20 dispose de 3 ports appelés A, B et C avec 32 bits chacun. Tous les bits ne sont pas disponibles sur les connecteurs de la carte et certains sont multiplexés avec d’autres types de liaisons comme des ports série, I2C, SPI, convertisseur A/N, USB, ….
L’utilisateur dispose de 28 lignes GPIO sur les deux connecteurs J6 et J7 de la carte :
| Pin # | ID | I/O line | Alt | Description | Pin # | ID | Line | Alt | Description |
| J7.1 | GND | Signal ground | J6.1 | 3.3V | 3.3 volt DC power line | ||||
| J7.2 | GND | Signal ground | J6.2 | 3,3V | 3.3 volt DC power line | ||||
| J7.3 | 82 | PB18 | General purpose I/O | J6.3 | 92 | PB28 | RTS1 | Request to send ttyS2 | |
| J7.4 | 83 | PB19 | General purpose I/O | J6.4 | 71 | PB7 | RXD1 | Receive data ttyS2 | |
| J7.5 | 80 | PB16 | General purpose I/O. | J6.5 | 70 | PB6 | TXD1 | Transmit line ttyS2 | |
| J7.6 | 81 | PB17 | General purpose I/O | J6.6 | 93 | PB29 | CTS1 | Clear to send ttyS2 | |
| J7.7 | 66 | PB2 | General purpose I/O | J6.7 | 90 | PB26 | RTS0 | Request to send ttyS1 | |
| J7.8 | 67 | PB3 | General purpose I/O | J6.8 | 69 | PB5 | RXD0 | Receive data ttyS1 | |
| J7.9 | 64 | PB0 | General purpose I/O | J6.9 | 68 | PB4 | TXD0 | Transmit data ttyS1 | |
| J7.10 | 65 | PB1 | General purpose I/O | J6.10 | 91 | PB27 | CTS0 | Clear to send ttyS1 | |
| J7.11 | 110 | PC14 | General purpose I/O 1.8V | J6.11 | N.C. (See the schematic) | ||||
| J7.12 | 111 | PC15 | General purpose I/O 1.8V | J6.12 | 5V | 5 volt DC power live | |||
| J7.13 | 108 | PC12 | General purpose I/O 1.8V | J6.13 | 75 | PB11 | RXD3 | Receive data ttyS4 | |
| J7.14 | 109 | PC13 | General purpose I/O 1.8V | J6.14 | 74 | PB10 | TXD3 | Transmit data ttyS4 | |
| J7.15 | 105 | PC9 | General purpose I/O 1.8V | J6.15 | 77 | PB13 | RXD5 | Receive data ttyS6 | |
| J7.16 | 106 | PC10 | CTS3 | Clear to send ttyS4 1.8V | J6.16 | 76 | PB12 | TXD5 | Transmit data ttyS6 |
| J7.17 | 103 | PC7 | Red led line 1.8V | J6.17 | 85 | PB21 | General purpose I/O | ||
| J7.18 | 104 | PC8 | RTS3 | Request to send ttyS4 1.8V | J6.18 | 84 | PB20 | General purpose I/O | |
| J7.19 | 101 | PC5 | General purpose I/O 1.8V | J6.19 | 95 | PB31 | General purpose I/O | ||
| J7.20 | 102 | PC6 | Reserved line. Used to read if the client USB port is wired to a PC | J6.20 | 94 | PB30 | General purpose I/O | ||
| J7.21 | 73 | PB9 | RXD2 | Receive data ttyS3 | J6.21 | 63 | PA31 | TXD4 | Transmit data ttyS5 |
| J7.22 | 72 | PB8 | TXD2 | Transmit data ttyS3 | J6.22 | 62 | PA30 | RXD4 | Receive data ttyS5 |
| J7.23 | BATT | RTC Battery input | J6.23 | N.C. (See the schematic) | |||||
| J7.24 | PGD | Power good NetusPS1 | J6.24 | 38 | PA6 | General purpose I/O | |||
| J7.25 | POK | 3.3V NetusPS1 aux output stable | J6.25 | 39 | PA7 | General purpose I/O | |||
| J7.26 | SHDNPS# | PS1 shutdown. Active low | J6.26 | 41 | PA9 | General purpose I/O | |||
| J7.27 | NRST | Reset output | J6.27 | 99 | PC3 | AD3 | Analog input 3 | ||
| J7.28 | SHDN# | Turn off the CPU when low | J6.28 | 98 | PC2 | AD2 | Analog input 2 | ||
| J7.29 | 5V | 5 volt power line | J6.29 | 97 | PC1 | AD1 | Analog input 1 | ||
| J7.30 | WAKEUP | Wake up input | J6.30 | 96 | PC0 | AD0 | Analog input 0 | ||
| J7.31 | 87 | PB23 | DCD0 | Data carrier detect ttyS1 | J6.31 | 56 | PA24 | SCL | I2C Clock |
| J7.32 | 86 | PB22 | DSR0 | Data set ready ttyS1 | J6.32 | 55 | PA23 | SDA | I2C Data |
| J7.33 | 89 | PB25 | RI0 | Ring indicator ttyS1 | J6.33 | AVDD | Clean 3.3V out for A/D circuitry | ||
| J7.34 | 88 | PB24 | DTR0 | Data terminal ready ttyS1 | J6.34 | VREF | A/D voltage reference input | ||
| J7.35 | 60 | PA28 | General purpose I/O | J6.35 | AGND | Analog ground | |||
| J7.36 | 59 | PA27 | General purpose I/O | J6.36 | 42 | PA10 | General purpose I/O | ||
| J7.37 | 58 | PA26 | General purpose I/O | J6.37 | 54 | PA22 | General purpose I/O | ||
| J7.38 | 57 | PA25 | General purpose I/O | J6.38 | 43 | PA11 | General purpose I/O | ||
| J7.39 | 3.3V | 3.3 volt power line | J6.39 | GND | Signal ground | ||||
| J7.40 | 3.3V | 3.3 volt power line | J6.40 | GND | Signal ground |