zenermerps/lvgl_esp32_drivers
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Fix README render on GitHub

Browse source
This commit is contained in:
Rop Gonggrijp 2021-07-12 13:00:46 +02:00
parent 6f2ce1307c
commit 5739934d14
1 changed files with 24 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
i2c_manager/README.md
View file

@ -43,26 +43,38 @@ I2C support in the LVGL ESP drivers is provided exclusively by the files in this
### Using I2C in an LVGL driver, a multi-step guide
Step 1
<dl>
: The Kconfig entries for your driver only need to specify that you will be using I2C. This is done by adding `select LV_I2C_DISPLAY` or `select LV_I2C_TOUCH`.
<dt>Step 1</dt>
Step 2
<dd>
The Kconfig entries for your driver only need to specify that you will be using I2C. This is done by adding `select LV_I2C_DISPLAY` or `select LV_I2C_TOUCH`.
</dd>
: To use the I2C port in your code you would do something like:
```c
#include "i2c_manager/i2c_manager.h"
<dt>Step 2</dt>
uint8_t data[2];
lvgl_i2c_read(CONFIG_LV_I2C_TOUCH_PORT, 0x23, 0x42, &data, 2);
```
<dd>
To use the I2C port in your code you would do something like:
This causes a touch driver to read two bytes at register `0x42` from the IC at address `0x23`. Replace `CONFIG_LV_I2C_TOUCH_PORT` by `CONFIG_LV_I2C_DISPLAY_PORT` when this is a display instead of a touch driver. `lvgl_i2c_write` works much the same way, except it writes the bytes from the buffer instead of reading them. _(It's ignored above but these functions return `esp_err_t` so you can check if the I2C communication worked.)_
```c
#include "i2c_manager/i2c_manager.h"
Step 3
uint8_t data[2];
lvgl_i2c_read(CONFIG_LV_I2C_TOUCH_PORT, 0x23, 0x42, &data, 2);
```
: There is no step 3, you are already done.
This causes a touch driver to read two bytes at register `0x42` from the IC at address `0x23`. Replace `CONFIG_LV_I2C_TOUCH_PORT` by `CONFIG_LV_I2C_DISPLAY_PORT` when this is a display instead of a touch driver. `lvgl_i2c_write` works much the same way, except it writes the bytes from the buffer instead of reading them. _(It's ignored above but these functions return `esp_err_t` so you can check if the I2C communication worked.)_
</dd>
<dt>Step 3</dt>
<dd>
There is no step 3, you are already done.
</dd>
</dl>
### Meanwhile, behind the scenes ...