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Pin usage of the Raspberry Pi firmware
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| RPi 1 RPi 1 RPi 1 RPi 1 RPi 1 RPi RPi RPi 2 RPi 3 RPi 3 | |
| A+ B r1 B r2 B+ CM 0 0 W B B CM | |
| 0 | | | X | | | | | | | | |
| 1 | | | X | | | | | | | | |
| 2 | | X | | | | | | | | | |
| 3 | | X | | | | | | | | | |
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| 5 | | X | X | | | | | | | | |
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| 27 | | X | | | | | | | | | |
| 28 | X | | | X | | X | X | X | | | |
| 29 | X | | | X | | X | X | X | | | |
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| 32 | X | | | X | | X | | X | | | |
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| 40 | X | X | X | X | | | X | X | X | | |
| 41 | X | | | X | | X | | X | X | | |
| 42 | | | | | | | | X | | | |
| 43 | | | | | | | | X | | | |
| 44 | | | | | | | X | | X | | |
| 45 | X | X | X | X | | | | X | X | | |
| 46 | | | | | | | | | X | X | |
| 47 | | | | | | | | | X | X | |
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Sorry, i didn't noticed your comment.
Usage counts with Linux kernel boot:
- the pin configuration (direction, function, pull, ...) shouldn't be changed
- in case of a GPIO the pin shouldn't be used as an interrupt source or changed its output value
PWM pins are needed by VCHIQ audio?
I added the new Raspberry Pi Zero W.
I added I2C0 for CAM, fixed pin number for Camera shutdown on RPi 1 B r1 and removed WL + BT pins on RPi Zero W.
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What counts as usage? The PWM pins aren't included in the table, but if you don't select the PWM functions on the relevant pins you would never notice. Conversely, the HAT I2C pins (28 & 29 on most boards - but not Pi3) aren't used by the firmware once the kernel has booted.