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i2c fallback: add required rules.mk info in docs

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Need to enable the driver in ChibiOS
This commit is contained in:
Dimitris Mantzouranis 2023-10-24 09:48:14 +03:00
parent 5b7af85493
commit 9014b516f2
1 changed files with 6 additions and 1 deletions
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7
docs/i2c_driver.md
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@ -120,7 +120,12 @@ See [this page](https://www.playembedded.org/blog/stm32-i2c-chibios/#8_I2Cv2_I2C
### I2C Fallback :id=arm-configuration-i2cfallback
ChibiOS provides a software solution through the I2C Fallback driver for cases where hardware I2C is not available.
To enable it, modify your board's `halconf.h` to enable the I2C Fallback driver( assuming selected I2C peripheral is `I2CD1`).
To enable it instead of the hardware driver, add the following to your `rules.mk`:
```make
USE_HAL_I2C_FALLBACK = yes
```
Then modify your board's `halconf.h` to select the I2C Fallback driver( assuming selected I2C peripheral is `I2CD1`).
```c
#define SW_I2C_USE_I2C1 TRUE
```