2019-12-25 04:32:12 -05:00
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## SPI master half duplex EEPROM example
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This code demonstrates how to use the SPI master half duplex mode to read/write a AT93C46D
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EEPROM (8-bit mode). There is also an Kconfig option `EXAMPLE_USE_SPI1_PINS` allowing use the
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SPI1 (bus with code Flash connected on official modules).
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### Connections
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For different chip and host used, the connections may be different.
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2021-07-26 23:02:49 -04:00
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| | ESP32 | ESP32 | ESP32S2 | ESP32C3 | ESP32S3 |
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| ---- | ----- | ----- | ------- | ------- | ------- |
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| Host | SPI1 | HSPI | FSPI | SPI2 | SPI2 |
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| VCC | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
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| GND | GND | GND | GND | GND | GND |
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| DO | 7 | 18 | 37 | 2 | 13 |
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| DI | 8 | 23 | 35 | 7 | 11 |
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| SK | 6 | 19 | 36 | 6 | 12 |
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| CS | 13 | 13 | 34 | 10 | 10 |
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| ORG | GND | GND | GND | GND | GND |
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2019-12-25 04:32:12 -05:00
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### Notes
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If you meet timeout issues, please check your connections.
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