| .. _spi-bitbang-sample: |
| |
| SPI-Bitbang Sample |
| #################### |
| |
| Overview |
| ******** |
| |
| This sample demonstrates using the bitbang SPI driver. The bitbang driver can |
| be useful for devices which use a non multiple of 8 word size, for example some |
| LCDs which have an extra cmd/data bit. |
| |
| This sample loops through some different spi transfer configurations. |
| |
| |
| Building and Running |
| ******************** |
| |
| The application will build only for a target that has a :ref:`devicetree |
| <dt-guide>` entry with :dtcompatible:`zephyr,spi-bitbang` as a compatible. |
| |
| You can connect the MISO and MOSI pins with a wire to provide a basic loopback |
| test for receive data. |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/drivers/spi_bitbang |
| :board: nrf52840dk_nrf52840 |
| :goals: build flash |
| :compact: |
| |
| Sample Output |
| ============= |
| |
| .. code-block:: console |
| |
| *** Booting Zephyr OS build zephyr-v2.6.0-2939-g1882b95b42e2 *** |
| basic_write_9bit_words; ret: 0 |
| wrote 0101 00ff 00a5 0000 0102 |
| 9bit_loopback_partial; ret: 0 |
| tx (i) : 0101 0102 |
| tx (ii) : 0003 0004 0105 |
| rx (ii) : 0003 0004 0105 |
| basic_write_9bit_words; ret: 0 |
| wrote 0101 00ff 00a5 0000 0102 |
| 9bit_loopback_partial; ret: 0 |
| tx (i) : 0101 0102 |
| tx (ii) : 0003 0004 0105 |
| rx (ii) : 0003 0004 0105 |
| basic_write_9bit_words; ret: 0 |
| wrote 0101 00ff 00a5 0000 0102 |
| 9bit_loopback_partial; ret: 0 |
| tx (i) : 0101 0102 |
| tx (ii) : 0003 0004 0105 |
| rx (ii) : 0003 0004 0105 |
