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107 lines
3.8 KiB
Markdown
107 lines
3.8 KiB
Markdown
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# SPI Slave Halfduplex: Segment Mode Examples
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(See the README.md file in the 'examples' directory for more information about IDF examples.)
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These two projects illustrate the SPI Slave Halfduplex Segment Mode.
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* ``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.
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* ``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.
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## How to use example
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### Hardware Required
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These 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.
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Following is the connection between 2 ESP32S2 boards:
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| Signal | Master | Slave |
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|-----------|--------|--------|
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| MOSI | GPIO11 | GPIO11 |
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| MISO | GPIO13 | GPIO13 |
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| SCLK | GPIO12 | GPIO12 |
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| CS | GPIO10 | GPIO10 |
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(Feel free to change the GPIO settings by editing the macro definations at the top of ``app_main.c`` files.)
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### Build and Flash
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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See 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.
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## Example Output
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``seg_master``
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```
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---------SLAVE INFO---------
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Slave MAX Send Buffer Size: 5000
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Slave MAX Receive Buffer Size: 120
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I (328) SEG_MASTER: RECEIVING......
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Transaction No.0 from slave, length: 4640
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I (338) SEG_MASTER: SENDING......
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I (348) SEG_MASTER: RECEIVING......
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Transaction No.1 from slave, length: 3299
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I (348) SEG_MASTER: SENDING......
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I (358) SEG_MASTER: RECEIVING......
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Transaction No.2 from slave, length: 4836
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I (368) SEG_MASTER: SENDING......
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I (368) SEG_MASTER: RECEIVING......
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Transaction No.3 from slave, length: 3333
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I (378) SEG_MASTER: SENDING......
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I (378) SEG_MASTER: RECEIVING......
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Transaction No.4 from slave, length: 4965
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I (388) SEG_MASTER: SENDING......
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I (388) SEG_MASTER: RECEIVING......
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Transaction No.5 from slave, length: 3042
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I (398) SEG_MASTER: SENDING......
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I (408) SEG_MASTER: RECEIVING......
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Transaction No.6 from slave, length: 4892
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I (408) SEG_MASTER: SENDING......
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I (418) SEG_MASTER: RECEIVING......
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Transaction No.7 from slave, length: 3585
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I (428) SEG_MASTER: SENDING......
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I (428) SEG_MASTER: RECEIVING......
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Transaction No.8 from slave, length: 3348
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I (438) SEG_MASTER: SENDING......
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I (438) SEG_MASTER: RECEIVING......
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Transaction No.9 from slave, length: 4985
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I (448) SEG_MASTER: SENDING......
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I (448) SEG_MASTER: RECEIVING......
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Transaction No.10 from slave, length: 3710
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...
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```
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``seg_slave``
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```
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77 bytes are received:
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this is master's transaction 0
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109 bytes are received:
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this is master's transaction 1
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83 bytes are received:
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this is master's transaction 2
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97 bytes are received:
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this is master's transaction 3
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47 bytes are received:
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this is master's transaction 4
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89 bytes are received:
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this is master's transaction 5
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80 bytes are received:
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this is master's transaction 6
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96 bytes are received:
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this is master's transaction 7
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83 bytes are received:
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this is master's transaction 8
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110 bytes are received:
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this is master's transaction 9
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113 bytes are received:
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this is master's transaction 10
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...
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```
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## Troubleshooting
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you.
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