The Raspberry Pi is based on the Broadcom BCM2835 system on a chip, which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU and was originally shipped with 256 megabytes of RAM, later upgraded (Model B & Model B+) to 512 MB. The Raspberry Pi 2 is based on an armv7 CPU but shares a number of similarities with the original.
Raspberry Pi A/B/A+/B+ Raspberry Pi 2 B
PWM Whilst the Raspberry Pi is meant to have 1 PWM channel this is currently not supported.
This pin mapping refers to the first generation 'B' model Pi but gives an idea as to what the values are from mraa. Note that there is an emum to use wiringPi style numbers.
| MRAA Number | Physical Pin | Function |
|---|---|---|
| 1 | P1-01 | 3V3 VCC |
| 2 | P1-02 | 5V VCC |
| 3 | P1-03 | I2C SDA |
| 4 | P1-04 | 5V VCC |
| 5 | P1-05 | I2C SCL |
| 6 | P1-06 | GND |
| 7 | P1-07 | GPIO(4) |
| 8 | P1-08 | UART TX |
| 9 | P1-09 | GND |
| 10 | P1-10 | UART RX |
| 11 | P1-11 | GPIO(17) |
| 12 | P1-12 | GPIO(18) |
| 13 | P1-13 | GPIO(21) |
| 14 | P1-14 | GND |
| 15 | P1-15 | GPIO(22) |
| 16 | P1-16 | GPIO(23) |
| 17 | P1-17 | 3V3 VCC |
| 18 | P1-18 | GPIO(24) |
| 19 | P1-19 | SPI MOSI |
| 20 | P1-20 | GND |
| 21 | P1-21 | SPI MISO |
| 22 | P1-22 | GPIO(25) |
| 23 | P1-23 | SPI SCL |
| 24 | P1-24 | SPI CS0 |
| 25 | P1-25 | GND |
| 26 | P1-26 | SPI CS1 |
The following pin mapping applies to the new Raspberry Pi model 2 and B+. Note that GPIO(21) is now GPIO(27)
| MRAA Number | Physical Pin | Function |
|---|---|---|
| 1 | P1-01 | 3V3 VCC |
| 2 | P1-02 | 5V VCC |
| 3 | P1-03 | I2C SDA |
| 4 | P1-04 | 5V VCC |
| 5 | P1-05 | I2C SCL |
| 6 | P1-06 | GND |
| 7 | P1-07 | GPIO(4) |
| 8 | P1-08 | UART TX |
| 9 | P1-09 | GND |
| 10 | P1-10 | UART RX |
| 11 | P1-11 | GPIO(17) |
| 12 | P1-12 | GPIO(18) |
| 13 | P1-13 | GPIO(27) |
| 14 | P1-14 | GND |
| 15 | P1-15 | GPIO(22) |
| 16 | P1-16 | GPIO(23) |
| 17 | P1-17 | 3V3 VCC |
| 18 | P1-18 | GPIO(24) |
| 19 | P1-19 | SPI MOSI |
| 20 | P1-20 | GND |
| 21 | P1-21 | SPI MISO |
| 22 | P1-22 | GPIO(25) |
| 23 | P1-23 | SPI SCL |
| 24 | P1-24 | SPI CS0 |
| 25 | P1-25 | GND |
| 26 | P1-26 | SPI CS1 |
| 27 | P1-27 | I2C SDA1 |
| 28 | P1-28 | I2C SCL1 |
| 29 | P1-29 | GPIO(5) |
| 30 | P1-30 | GND |
| 31 | P1-31 | GPIO(6) |
| 32 | P1-32 | GPIO(12) |
| 33 | P1-33 | GPIO(13) |
| 34 | P1-34 | GND |
| 35 | P1-35 | SPI MISO1 |
| 36 | P1-36 | GPIO(16) |
| 37 | P1-37 | GPIO(26) |
| 38 | P1-38 | SPI MOSI1 |
| 39 | P1-39 | GND |
| 40 | P1-40 | SPI SCL1 |