When you use System I/O module that is GPIO, PWM, SPI, I2C, and UART, you should know specified pin, bus or port number.
| GPIO Name | Pin Number | GPIO Name | Pin Number |
|---|
| GPIO0 | 128 | GPIO1 | 129 |
| GPIO2 | 130 | GPIO3 | 46 |
| GPIO4 | 14 | GPIO5 | 41 |
| GPIO6 | 25 | GPIO7 | 0 |
| GPIO8 | 26 | GPIO9 | 27 |
| GPIO Name | Pin Number | GPIO Name | Pin Number |
|---|
| GPIO4 | 4 | GPIO5 | 5 |
| GPIO6 | 6 | GPIO12 | 12 |
| GPIO13 | 13 | GPIO16 | 16 |
| GPIO17 | 17 | GPIO18 | 18 |
| GPIO19 | 19 | GPIO20 | 20 |
| GPIO21 | 21 | GPIO20 | 20 |
| GPIO23 | 23 | GPIO24 | 24 |
| GPIO25 | 25 | GPIO26 | 26 |
| GPIO27 | 27 | - | - |
| SPI Name | Bus Number | Chip Select |
|---|
| SPI | 2 | 0 |
| SPI Name | Bus Number | Chip Select |
|---|
| SPI0(CS0) | 0 | 0 |
| SPI0(CS1) | 0 | 1 |
| UART Name | Port Number |
|---|
| UART0 | 4 |
| UART Name | Port Number |
|---|
| UART0 | 0 |