1# SPI Slave Halfduplex: Segment Mode Examples 2 3(See the README.md file in the 'examples' directory for more information about IDF examples.) 4 5These two projects illustrate the SPI Slave Halfduplex Segment Mode. 6* ``seg_slave`` shows one of the ways to use the SPI Slave Halfduplex driver. There are 2 tasks repeating to receive/send transactions from/to SPI Master respectively. 7* ``seg_master`` shows how to use the ESP Serial Slave Link APIs to communicate with SPI Slave Halfduplex driver. It receives/sends transactions from/to slave a few times. 8 9## How to use example 10 11### Hardware Required 12 13These two projects are supposed to be flashed onto two seperate boards and jumped together via correctly connected SPI pins defined in both of the ``app_main.c`` files. For the ``seg_master`` project, it could be flashed onto all the ESP Chips. Whereas the ``seg_slave`` currently could be flashed onto ESP32-S2. Once they are connected and flashed, they will use the SPI Master and SPI Slave Halfduplex drivers to communicate with each other. 14 15Following is the connection between 2 ESP32S2 boards: 16 17| Signal | Master | Slave | 18|-----------|--------|--------| 19| MOSI | GPIO11 | GPIO11 | 20| MISO | GPIO13 | GPIO13 | 21| SCLK | GPIO12 | GPIO12 | 22| CS | GPIO10 | GPIO10 | 23 24(Feel free to change the GPIO settings by editing the macro definations at the top of ``app_main.c`` files.) 25 26### Build and Flash 27 28Run `idf.py -p PORT flash monitor` to build, flash and monitor the project. 29 30(To exit the serial monitor, type ``Ctrl-]``.) 31 32See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to build, flash and monitor projects. 33 34## Example Output 35 36``seg_master`` 37``` 38---------SLAVE INFO--------- 39 40Slave MAX Send Buffer Size: 5000 41Slave MAX Receive Buffer Size: 120 42I (328) SEG_MASTER: RECEIVING...... 43Transaction No.0 from slave, length: 4640 44I (338) SEG_MASTER: SENDING...... 45I (348) SEG_MASTER: RECEIVING...... 46Transaction No.1 from slave, length: 3299 47I (348) SEG_MASTER: SENDING...... 48I (358) SEG_MASTER: RECEIVING...... 49Transaction No.2 from slave, length: 4836 50I (368) SEG_MASTER: SENDING...... 51I (368) SEG_MASTER: RECEIVING...... 52Transaction No.3 from slave, length: 3333 53I (378) SEG_MASTER: SENDING...... 54I (378) SEG_MASTER: RECEIVING...... 55Transaction No.4 from slave, length: 4965 56I (388) SEG_MASTER: SENDING...... 57I (388) SEG_MASTER: RECEIVING...... 58Transaction No.5 from slave, length: 3042 59I (398) SEG_MASTER: SENDING...... 60I (408) SEG_MASTER: RECEIVING...... 61Transaction No.6 from slave, length: 4892 62I (408) SEG_MASTER: SENDING...... 63I (418) SEG_MASTER: RECEIVING...... 64Transaction No.7 from slave, length: 3585 65I (428) SEG_MASTER: SENDING...... 66I (428) SEG_MASTER: RECEIVING...... 67Transaction No.8 from slave, length: 3348 68I (438) SEG_MASTER: SENDING...... 69I (438) SEG_MASTER: RECEIVING...... 70Transaction No.9 from slave, length: 4985 71I (448) SEG_MASTER: SENDING...... 72I (448) SEG_MASTER: RECEIVING...... 73Transaction No.10 from slave, length: 3710 74... 75``` 76 77``seg_slave`` 78``` 7977 bytes are received: 80this is master's transaction 0 81109 bytes are received: 82this is master's transaction 1 8383 bytes are received: 84this is master's transaction 2 8597 bytes are received: 86this is master's transaction 3 8747 bytes are received: 88this is master's transaction 4 8989 bytes are received: 90this is master's transaction 5 9180 bytes are received: 92this is master's transaction 6 9396 bytes are received: 94this is master's transaction 7 9583 bytes are received: 96this is master's transaction 8 97110 bytes are received: 98this is master's transaction 9 99113 bytes are received: 100this is master's transaction 10 101... 102``` 103 104## Troubleshooting 105 106For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you. 107
