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qmk_firmware/docs/drivers/snled27351.md

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# SNLED27351 Driver {#snled27351-driver}
I²C 16x12 LED matrix driver by Sonix. Supports a maximum of four drivers, each controlling up to 192 single-color LEDs, or 64 RGB LEDs.
A slightly modified version of this IC is also known as "CKLED2001".
[SNLED27351 Datasheet](https://www.sonix.com.tw/files/1/D235860C0C037C28E050007F01001CBE)
## Usage {#usage}
The SNLED27351 driver code is automatically included if you are using the [LED Matrix](../features/led_matrix) or [RGB Matrix](../features/rgb_matrix) feature with the `snled27351` driver set, and you would use those APIs instead.
However, if you need to use the driver standalone, add this to your `rules.mk`:
```make
COMMON_VPATH += $(DRIVER_PATH)/led
SRC += snled27351-mono.c # For single-color
SRC += snled27351.c # For RGB
I2C_DRIVER_REQUIRED = yes
```
## Basic Configuration {#basic-configuration}
Add the following to your `config.h`:
|Define |Default |Description |
|----------------------------|-------------|----------------------------------------------------|
|`SNLED27351_SDB_PIN` |*Not defined*|The GPIO pin connected to the drivers' shutdown pins|
|`SNLED27351_I2C_TIMEOUT` |`100` |The I²C timeout in milliseconds |
|`SNLED27351_I2C_PERSISTENCE`|`0` |The number of times to retry I²C transmissions |
|`SNLED27351_I2C_ADDRESS_1` |*Not defined*|The I²C address of driver 0 |
|`SNLED27351_I2C_ADDRESS_2` |*Not defined*|The I²C address of driver 1 |
|`SNLED27351_I2C_ADDRESS_3` |*Not defined*|The I²C address of driver 2 |
|`SNLED27351_I2C_ADDRESS_4` |*Not defined*|The I²C address of driver 3 |
### I²C Addressing {#i2c-addressing}
The SNLED27351 has four possible 7-bit I²C addresses, depending on how the `ADDR` pin is connected.
To configure this, set the `SNLED27351_I2C_ADDRESS_n` defines to one of the following in your `config.h`, where *n* denotes the driver index:
|Define |Value |
|------------------------------|------|
|`SNLED27351_I2C_ADDRESS_GND` |`0x74`|
|`SNLED27351_I2C_ADDRESS_SCL` |`0x75`|
|`SNLED27351_I2C_ADDRESS_SDA` |`0x76`|
|`SNLED27351_I2C_ADDRESS_VDDIO`|`0x77`|
## ARM/ChibiOS Configuration {#arm-configuration}
Depending on the ChibiOS board configuration, you may need to [enable and configure I²C](i2c#arm-configuration) at the keyboard level.
## LED Mapping {#led-mapping}
In order to use this driver, each output must be mapped to an LED index, by adding the following to your `<keyboardname>.c`:
```c
const snled27351_led_t PROGMEM g_snled27351_leds[SNLED27351_LED_COUNT] = {
/* Driver
* | R G B */
{0, CB1_CA1, CB1_CA2, CB1_CA3},
// etc...
};
```
In this example, the red, green and blue channels for the first LED index on driver 0 all have their cathodes connected to the `CB1` pin, and their anodes on the `CA1`, `CA2` and `CA3` pins respectively.
For the single-color driver, the principle is the same, but there is only one channel:
```c
const snled27351_led_t PROGMEM g_snled27351_leds[SNLED27351_LED_COUNT] = {
/* Driver
* | V */
{0, CB1_CA1},
// etc...
};
```
These values correspond to the register indices as shown in the datasheet on page 13.
## API {#api}
### `struct snled27351_led_t` {#api-snled27351-led-t}
Contains the PWM register addresses for a single RGB LED.
#### Members {#api-snled27351-led-t-members}
- `uint8_t driver`
The driver index of the LED, from 0 to 3.
- `uint8_t r`
The output PWM register address for the LED's red channel (RGB driver only).
- `uint8_t g`
The output PWM register address for the LED's green channel (RGB driver only).
- `uint8_t b`
The output PWM register address for the LED's blue channel (RGB driver only).
- `uint8_t v`
The output PWM register address for the LED (single-color driver only).
---
### `void snled27351_init(uint8_t index)` {#api-snled27351-init}
Initialize the LED driver. This function should be called first.
#### Arguments {#api-snled27351-init-arguments}
- `uint8_t index`
The driver index.
---
### `void snled27351_write_register(uint8_t index, uint8_t reg, uint8_t data)` {#api-snled27351-write-register}
Set the value of the given register.
#### Arguments {#api-snled27351-write-register-arguments}
- `uint8_t index`
The driver index.
- `uint8_t reg`
The register address.
- `uint8_t data`
The value to set.
---
### `void snled27351_select_page(uint8_t index, uint8_t page)` {#api-snled27351-select-page}
Change the current page for configuring the LED driver.
#### Arguments {#api-snled27351-select-page-arguments}
- `uint8_t index`
The driver index.
- `uint8_t page`
The page number to select.
---
### `void snled27351_set_color(int index, uint8_t red, uint8_t green, uint8_t blue)` {#api-snled27351-set-color}
Set the color of a single LED (RGB driver only). This function does not immediately update the LEDs; call `snled27351_update_pwm_buffers()` after you are finished.
#### Arguments {#api-snled27351-set-color-arguments}
- `int index`
The LED index (ie. the index into the `g_snled27351_leds` array).
- `uint8_t red`
The red value to set.
- `uint8_t green`
The green value to set.
- `uint8_t blue`
The blue value to set.
---
### `void snled27351_set_color_all(uint8_t red, uint8_t green, uint8_t blue)` {#api-snled27351-set-color-all}
Set the color of all LEDs (RGB driver only).
#### Arguments {#api-snled27351-set-color-all-arguments}
- `uint8_t red`
The red value to set.
- `uint8_t green`
The green value to set.
- `uint8_t blue`
The blue value to set.
---
### `void snled27351_set_value(int index, uint8_t value)` {#api-snled27351-set-value}
Set the brightness of a single LED (single-color driver only). This function does not immediately update the LEDs; call `snled27351_update_pwm_buffers()` after you are finished.
#### Arguments {#api-snled27351-set-value-arguments}
- `int index`
The LED index (ie. the index into the `g_snled27351_leds` array).
- `uint8_t value`
The brightness value to set.
---
### `void snled27351_set_value_all(uint8_t value)` {#api-snled27351-set-value-all}
Set the brightness of all LEDs (single-color driver only).
#### Arguments {#api-snled27351-set-value-all-arguments}
- `uint8_t value`
The brightness value to set.
---
### `void snled27351_set_led_control_register(uint8_t index, bool red, bool green, bool blue)` {#api-snled27351-set-led-control-register-rgb}
Configure the LED control registers for a single LED (RGB driver only). This function does not immediately update the LEDs; call `snled27351_update_led_control_registers()` after you are finished.
#### Arguments {#api-snled27351-set-led-control-register-rgb-arguments}
- `uint8_t index`
The LED index (ie. the index into the `g_snled27351_leds` array).
- `bool red`
Enable or disable the red channel.
- `bool green`
Enable or disable the green channel.
- `bool blue`
Enable or disable the blue channel.
---
### `void snled27351_set_led_control_register(uint8_t index, bool value)` {#api-snled27351-set-led-control-register-mono}
Configure the LED control registers for a single LED (single-color driver only). This function does not immediately update the LEDs; call `snled27351_update_led_control_registers()` after you are finished.
#### Arguments {#api-snled27351-set-led-control-register-mono-arguments}
- `uint8_t index`
The LED index (ie. the index into the `g_snled27351_leds` array).
- `bool value`
Enable or disable the LED.
---
### `void snled27351_update_pwm_buffers(uint8_t index)` {#api-snled27351-update-pwm-buffers}
Flush the PWM values to the LED driver.
#### Arguments {#api-snled27351-update-pwm-buffers-arguments}
- `uint8_t index`
The driver index.
---
### `void snled27351_update_led_control_registers(uint8_t index)` {#api-snled27351-update-led-control-registers}
Flush the LED control register values to the LED driver.
#### Arguments {#api-snled27351-update-led-control-registers-arguments}
- `uint8_t index`
The driver index.
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