pxt-calliope/docs/reference/pins/spi-pins.md
2020-08-19 22:03:58 +02:00

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# spi Pins
Set the Serial Peripheral Interface (SPI) signalling pins
```sig
pins.spiPins(DigitalPin.P0, DigitalPin.P1, DigitalPin.P2);
```
To configure the @boardname@ to write to an external device using a SPI connection, each SPI signal line is assigned to unique a pin. A SPI connection uses 3 signalling lines called **MOSI**, **MISO**, and **SCK**.
### ~ hint
**Simulator**: This function needs real hardware to work with. It's not supported in the simulator.
### ~
If you don't set the pins for the SPI connection, the default pin assignments are used:
* **P15** = **MOSI**, @boardname@ SPI data output pin
* **P14** = **MISO**, @boardname@ SPI data input pin
* **P13** = **SCK**, @boardname@ SPI serial clock output pin
## Parameters
* **mosi**: the pin for SPI data output, the **MOSI** signal pin.
* **miso**: the pin for SPI data input, the **MISO** signal pin.
* **sck**: the pin for SPI serial clock output, the **SCK** signal pin.
## Example
Set the pin assignments for a SPI connection to the default pins.
```blocks
pins.spiPins(DigitalPin.C15, DigitalPin.C14, DigitalPin.C13);
```
## See also
[spi write](/reference/pins/spi-write),
[spi frequency](/reference/pins/spi-frequency),
[spi format](/reference/pins/spi-format)
[SPI Programming](https://developer.mbed.org/handbook/SPI)