311 lines
11 KiB
Markdown
311 lines
11 KiB
Markdown
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# IS31FL3741 Driver {#is31fl3741-driver}
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I²C 39x9 LED matrix driver by Lumissil. Supports a maximum of four drivers, each controlling up to 351 single-color LEDs, or 117 RGB LEDs.
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[IS31FL3741A Datasheet](https://www.lumissil.com/assets/pdf/core/IS31FL3741A_DS.pdf)
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## Usage {#usage}
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The IS31FL3741 driver code is automatically included if you are using the [LED Matrix](../features/led_matrix) or [RGB Matrix](../features/rgb_matrix) feature with the `is31fl3741` driver set, and you would use those APIs instead.
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However, if you need to use the driver standalone, add this to your `rules.mk`:
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```make
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COMMON_VPATH += $(DRIVER_PATH)/led/issi
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SRC += is31fl3741-mono.c # For single-color
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SRC += is31fl3741.c # For RGB
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I2C_DRIVER_REQUIRED = yes
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```
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## Basic Configuration {#basic-configuration}
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Add the following to your `config.h`:
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|Define |Default |Description |
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|----------------------------|---------------------------------|----------------------------------------------------|
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|`IS31FL3741_SDB_PIN` |*Not defined* |The GPIO pin connected to the drivers' shutdown pins|
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|`IS31FL3741_I2C_TIMEOUT` |`100` |The I²C timeout in milliseconds |
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|`IS31FL3741_I2C_PERSISTENCE`|`0` |The number of times to retry I²C transmissions |
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|`IS31FL3741_I2C_ADDRESS_1` |*Not defined* |The I²C address of driver 0 |
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|`IS31FL3741_I2C_ADDRESS_2` |*Not defined* |The I²C address of driver 1 |
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|`IS31FL3741_I2C_ADDRESS_3` |*Not defined* |The I²C address of driver 2 |
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|`IS31FL3741_I2C_ADDRESS_4` |*Not defined* |The I²C address of driver 3 |
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|`IS31FL3741_CONFIGURATION` |`1` |The value of the configuration register |
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|`IS31FL3741_PWM_FREQUENCY` |`IS31FL3741_PWM_FREQUENCY_29K_HZ`|The PWM frequency of the LEDs (IS31FL3741A only) |
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|`IS31FL3741_SW_PULLUP` |`IS31FL3741_PUR_32K_OHM` |The `SWx` pullup resistor value |
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|`IS31FL3741_CS_PULLDOWN` |`IS31FL3741_PDR_32K_OHM` |The `CSx` pulldown resistor value |
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|`IS31FL3741_GLOBAL_CURRENT` |`0xFF` |The global current control value |
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### I²C Addressing {#i2c-addressing}
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The IS31FL3741 has four possible 7-bit I²C addresses, depending on how the `ADDR` pin is connected.
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To configure this, set the `IS31FL3741_I2C_ADDRESS_n` defines to one of the following in your `config.h`, where *n* denotes the driver index:
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|Define |Value |
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|----------------------------|------|
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|`IS31FL3741_I2C_ADDRESS_GND`|`0x30`|
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|`IS31FL3741_I2C_ADDRESS_SCL`|`0x31`|
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|`IS31FL3741_I2C_ADDRESS_SDA`|`0x32`|
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|`IS31FL3741_I2C_ADDRESS_VCC`|`0x33`|
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### PWM Frequency {#pwm-frequency}
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The PWM frequency can be adjusted (for IS31FL3741A only) by adding the following to your `config.h`:
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```c
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#define IS31FL3741_PWM_FREQUENCY IS31FL3741_PWM_FREQUENCY_29K_HZ
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```
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Valid values are:
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|Define |Frequency |
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|---------------------------------|----------------|
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|`IS31FL3741_PWM_FREQUENCY_29K_HZ`|29 kHz (default)|
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|`IS31FL3741_PWM_FREQUENCY_3K6_HZ`|3.6 kHz |
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|`IS31FL3741_PWM_FREQUENCY_1K8_HZ`|1.8 kHz |
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|`IS31FL3741_PWM_FREQUENCY_900_HZ`|900 Hz |
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### De-Ghosting {#de-ghosting}
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These settings control the pullup and pulldown resistor values on the `CSx` and `SWy` pins respectively, for the purposes of eliminating ghosting. Refer to the datasheet (p. 18) for more information on how and why this occurs.
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To adjust the resistor values, add the following to your `config.h`:
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```c
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#define IS31FL3741_SW_PULLUP IS31FL3741_PUR_32K_OHM
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#define IS31FL3741_CS_PULLDOWN IS31FL3741_PDR_32K_OHM
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```
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Valid values for `IS31FL3741_SW_PULLUP` are:
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|Define |Resistance |
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|------------------------|---------------|
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|`IS31FL3741_PUR_0_OHM` |None |
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|`IS31FL3741_PUR_0K5_OHM`|0.5 kΩ |
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|`IS31FL3741_PUR_1K_OHM` |1 kΩ |
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|`IS31FL3741_PUR_2K_OHM` |2 kΩ |
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|`IS31FL3741_PUR_4K_OHM` |4 kΩ |
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|`IS31FL3741_PUR_8K_OHM` |8 kΩ |
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|`IS31FL3741_PUR_16K_OHM`|16 kΩ |
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|`IS31FL3741_PUR_32K_OHM`|32 kΩ (default)|
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Valid values for `IS31FL3741_CS_PULLDOWN` are:
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|Define |Resistance |
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|------------------------|---------------|
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|`IS31FL3741_PDR_0_OHM` |None |
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|`IS31FL3741_PDR_0K5_OHM`|0.5 kΩ |
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|`IS31FL3741_PDR_1K_OHM` |1 kΩ |
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|`IS31FL3741_PDR_2K_OHM` |2 kΩ |
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|`IS31FL3741_PDR_4K_OHM` |4 kΩ |
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|`IS31FL3741_PDR_8K_OHM` |8 kΩ |
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|`IS31FL3741_PDR_16K_OHM`|16 kΩ |
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|`IS31FL3741_PDR_32K_OHM`|32 kΩ (default)|
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### Global Current Control {#global-current-control}
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This setting controls the current sunk by the `CSx` pins, from 0 to 255. By default, the value is the maximum (255), but if you need to lower it, add the following to your `config.h`:
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```c
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#define IS31FL3741_GLOBAL_CURRENT 0xFF
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```
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## ARM/ChibiOS Configuration {#arm-configuration}
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Depending on the ChibiOS board configuration, you may need to [enable and configure I²C](i2c#arm-configuration) at the keyboard level.
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## LED Mapping {#led-mapping}
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In order to use this driver, each output must be mapped to an LED index, by adding the following to your `<keyboardname>.c`:
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```c
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const is31fl3741_led_t PROGMEM g_is31fl3741_leds[IS31FL3741_LED_COUNT] = {
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/* Driver
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* | R G B */
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{0, SW1_CS1, SW1_CS2, SW1_CS3},
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// etc...
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};
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```
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In this example, the red, green and blue channels for the first LED index on driver 0 all have their anodes connected to the `SW1` pin, and their cathodes on the `CS1`, `CS2` and `CS3` pins respectively.
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For the single-color driver, the principle is the same, but there is only one channel:
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```c
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const is31fl3741_led_t PROGMEM g_is31fl3741_leds[IS31FL3741_LED_COUNT] = {
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/* Driver
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* | V */
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{0, SW1_CS1},
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// etc...
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};
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```
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These values correspond to the register indices as shown in the datasheet on page 12, figure 8.
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## API {#api}
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### `struct is31fl3741_led_t` {#api-is31fl3741-led-t}
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Contains the PWM register addresses for a single RGB LED.
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#### Members {#api-is31fl3741-led-t-members}
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- `uint32_t driver`
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The driver index of the LED, from 0 to 3.
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- `uint32_t r`
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The output PWM register address for the LED's red channel (RGB driver only).
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- `uint32_t g`
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The output PWM register address for the LED's green channel (RGB driver only).
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- `uint32_t b`
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The output PWM register address for the LED's blue channel (RGB driver only).
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- `uint32_t v`
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The output PWM register address for the LED (single-color driver only).
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---
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### `void is31fl3741_init(uint8_t index)` {#api-is31fl3741-init}
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Initialize the LED driver. This function should be called first.
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#### Arguments {#api-is31fl3741-init-arguments}
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- `uint8_t index`
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The driver index.
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---
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### `void is31fl3741_write_register(uint8_t index, uint8_t reg, uint8_t data)` {#api-is31fl3741-write-register}
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Set the value of the given register.
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#### Arguments {#api-is31fl3741-write-register-arguments}
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- `uint8_t index`
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The driver index.
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- `uint8_t reg`
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The register address.
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- `uint8_t data`
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The value to set.
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---
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### `void is31fl3741_select_page(uint8_t index, uint8_t page)` {#api-is31fl3741-select-page}
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Change the current page for configuring the LED driver.
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#### Arguments {#api-is31fl3741-select-page-arguments}
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- `uint8_t index`
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The driver index.
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- `uint8_t page`
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The page number to select.
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---
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### `void is31fl3741_set_color(int index, uint8_t red, uint8_t green, uint8_t blue)` {#api-is31fl3741-set-color}
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Set the color of a single LED (RGB driver only). This function does not immediately update the LEDs; call `is31fl3741_update_pwm_buffers()` after you are finished.
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#### Arguments {#api-is31fl3741-set-color-arguments}
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- `int index`
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The LED index (ie. the index into the `g_is31fl3741_leds` array).
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- `uint8_t red`
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The red value to set.
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- `uint8_t green`
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The green value to set.
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- `uint8_t blue`
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The blue value to set.
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---
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### `void is31fl3741_set_color_all(uint8_t red, uint8_t green, uint8_t blue)` {#api-is31fl3741-set-color-all}
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Set the color of all LEDs (RGB driver only).
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#### Arguments {#api-is31fl3741-set-color-all-arguments}
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- `uint8_t red`
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The red value to set.
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- `uint8_t green`
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The green value to set.
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- `uint8_t blue`
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The blue value to set.
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---
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### `void is31fl3741_set_value(int index, uint8_t value)` {#api-is31fl3741-set-value}
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Set the brightness of a single LED (single-color driver only). This function does not immediately update the LEDs; call `is31fl3741_update_pwm_buffers()` after you are finished.
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#### Arguments {#api-is31fl3741-set-value-arguments}
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- `int index`
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The LED index (ie. the index into the `g_is31fl3741_leds` array).
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- `uint8_t value`
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The brightness value to set.
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---
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### `void is31fl3741_set_value_all(uint8_t value)` {#api-is31fl3741-set-value-all}
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Set the brightness of all LEDs (single-color driver only).
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#### Arguments {#api-is31fl3741-set-value-all-arguments}
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- `uint8_t value`
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The brightness value to set.
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---
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### `void is31fl3741_set_led_control_register(uint8_t index, bool red, bool green, bool blue)` {#api-is31fl3741-set-led-control-register-rgb}
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Configure the LED control registers for a single LED (RGB driver only). This function does not immediately update the LEDs; call `is31fl3741_update_led_control_registers()` after you are finished.
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#### Arguments {#api-is31fl3741-set-led-control-register-rgb-arguments}
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- `uint8_t index`
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The LED index (ie. the index into the `g_is31fl3741_leds` array).
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- `bool red`
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Enable or disable the red channel.
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- `bool green`
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Enable or disable the green channel.
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- `bool blue`
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Enable or disable the blue channel.
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---
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### `void is31fl3741_set_led_control_register(uint8_t index, bool value)` {#api-is31fl3741-set-led-control-register-mono}
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Configure the LED control registers for a single LED (single-color driver only). This function does not immediately update the LEDs; call `is31fl3741_update_led_control_registers()` after you are finished.
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#### Arguments {#api-is31fl3741-set-led-control-register-mono-arguments}
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- `uint8_t index`
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The LED index (ie. the index into the `g_is31fl3741_leds` array).
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- `bool value`
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Enable or disable the LED.
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---
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### `void is31fl3741_update_pwm_buffers(uint8_t index)` {#api-is31fl3741-update-pwm-buffers}
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Flush the PWM values to the LED driver.
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#### Arguments {#api-is31fl3741-update-pwm-buffers-arguments}
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- `uint8_t index`
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The driver index.
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---
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### `void is31fl3741_update_led_control_registers(uint8_t index)` {#api-is31fl3741-update-led-control-registers}
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Flush the LED control register values to the LED driver.
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#### Arguments {#api-is31fl3741-update-led-control-registers-arguments}
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- `uint8_t index`
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The driver index.
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