320 lines
12 KiB
Markdown
320 lines
12 KiB
Markdown
# IS31FL3743A Driver {#is31fl3743a-driver}
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I²C 18x11 LED matrix driver by Lumissil. Supports a maximum of four drivers, each controlling up to 198 single-color LEDs, or 66 RGB LEDs.
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[IS31FL3743A Datasheet](https://www.lumissil.com/assets/pdf/core/IS31FL3743A_DS.pdf)
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## Usage {#usage}
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The IS31FL3743A driver code is automatically included if you are using the [LED Matrix](../features/led_matrix) or [RGB Matrix](../features/rgb_matrix) feature with the `is31fl3743a` 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 += is31fl3743a-mono.c # For single-color
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SRC += is31fl3743a.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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|`IS31FL3743A_SDB_PIN` |*Not defined* |The GPIO pin connected to the drivers' shutdown pins|
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|`IS31FL3743A_I2C_TIMEOUT` |`100` |The I²C timeout in milliseconds |
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|`IS31FL3743A_I2C_PERSISTENCE`|`0` |The number of times to retry I²C transmissions |
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|`IS31FL3743A_I2C_ADDRESS_1` |*Not defined* |The I²C address of driver 0 |
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|`IS31FL3743A_I2C_ADDRESS_2` |*Not defined* |The I²C address of driver 1 |
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|`IS31FL3743A_I2C_ADDRESS_3` |*Not defined* |The I²C address of driver 2 |
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|`IS31FL3743A_I2C_ADDRESS_4` |*Not defined* |The I²C address of driver 3 |
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|`IS31FL3743A_SYNC_1` |`IS31FL3743A_SYNC_NONE` |The sync configuration for driver 0 |
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|`IS31FL3743A_SYNC_2` |`IS31FL3743A_SYNC_NONE` |The sync configuration for driver 1 |
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|`IS31FL3743A_SYNC_3` |`IS31FL3743A_SYNC_NONE` |The sync configuration for driver 2 |
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|`IS31FL3743A_SYNC_4` |`IS31FL3743A_SYNC_NONE` |The sync configuration for driver 3 |
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|`IS31FL3743A_CONFIGURATION` |`0x01` |The value of the configuration register |
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|`IS31FL3743A_SW_PULLDOWN` |`IS31FL3743A_PDR_2K_OHM_SW_OFF`|The `SWx` pulldown resistor value |
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|`IS31FL3743A_CS_PULLUP` |`IS31FL3743A_PUR_2K_OHM_CS_OFF`|The `CSx` pullup resistor value |
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|`IS31FL3743A_GLOBAL_CURRENT` |`0xFF` |The global current control value |
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### I²C Addressing {#i2c-addressing}
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The IS31FL3743A has 16 possible 7-bit I²C addresses, depending on how the `ADDR1` and `ADDR2` pins are connected.
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To configure this, set the `IS31FL3743A_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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|`IS31FL3743A_I2C_ADDRESS_GND_GND`|`0x20`|
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|`IS31FL3743A_I2C_ADDRESS_GND_SCL`|`0x21`|
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|`IS31FL3743A_I2C_ADDRESS_GND_SDA`|`0x22`|
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|`IS31FL3743A_I2C_ADDRESS_GND_VCC`|`0x23`|
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|`IS31FL3743A_I2C_ADDRESS_SCL_GND`|`0x24`|
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|`IS31FL3743A_I2C_ADDRESS_SCL_SCL`|`0x25`|
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|`IS31FL3743A_I2C_ADDRESS_SCL_SDA`|`0x26`|
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|`IS31FL3743A_I2C_ADDRESS_SCL_VCC`|`0x27`|
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|`IS31FL3743A_I2C_ADDRESS_SDA_GND`|`0x28`|
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|`IS31FL3743A_I2C_ADDRESS_SDA_SCL`|`0x29`|
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|`IS31FL3743A_I2C_ADDRESS_SDA_SDA`|`0x2A`|
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|`IS31FL3743A_I2C_ADDRESS_SDA_VCC`|`0x2B`|
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|`IS31FL3743A_I2C_ADDRESS_VCC_GND`|`0x2C`|
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|`IS31FL3743A_I2C_ADDRESS_VCC_SCL`|`0x2D`|
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|`IS31FL3743A_I2C_ADDRESS_VCC_SDA`|`0x2E`|
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|`IS31FL3743A_I2C_ADDRESS_VCC_VCC`|`0x2F`|
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### Multi-Driver Synchronization {#multi-driver-synchronization}
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Multiple IS31FL3743A drivers can be synchronized by connecting the `SYNC` pins together. One driver must be designated as the "master", and the others configured as "slave".
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To do this, set the `IS31FL3743A_SYNC_n` defines accordingly in your `config.h`, where *n* denotes the driver index:
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|Define |Value |
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|-------------------------|---------------------------|
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|`IS31FL3743A_SYNC_NONE` |No synchronization |
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|`IS31FL3743A_SYNC_MASTER`|Driver configured as master|
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|`IS31FL3743A_SYNC_SLAVE` |Driver configured as slave |
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### De-Ghosting {#de-ghosting}
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These settings control the pulldown and pullup resistor values on the `SWy` and `CSx` pins respectively, for the purposes of eliminating ghosting. Refer to the datasheet (p. 23) 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 IS31FL3743A_SW_PULLDOWN IS31FL3743A_PDR_2K_OHM_SW_OFF
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#define IS31FL3743A_CS_PULLUP IS31FL3743A_PUR_2K_OHM_CS_OFF
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```
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Valid values for `IS31FL3743A_SW_PULLDOWN` are:
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|Define |Resistance |
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|--------------------------------|------------------------------|
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|`IS31FL3743A_PDR_0_OHM` |None (default) |
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|`IS31FL3743A_PDR_0K5_OHM_SW_OFF`|0.5 kΩ in SWx off time |
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|`IS31FL3743A_PDR_1K_OHM_SW_OFF` |1 kΩ in SWx off time |
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|`IS31FL3743A_PDR_2K_OHM_SW_OFF` |2 kΩ in SWx off time (default)|
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|`IS31FL3743A_PDR_1K_OHM` |1 kΩ |
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|`IS31FL3743A_PDR_2K_OHM` |2 kΩ |
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|`IS31FL3743A_PDR_4K_OHM` |4 kΩ |
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|`IS31FL3743A_PDR_8K_OHM` |8 kΩ |
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Valid values for `IS31FL3743A_CS_PULLUP` are:
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|Define |Resistance |
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|--------------------------------|------------------------------|
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|`IS31FL3743A_PUR_0_OHM` |None (default) |
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|`IS31FL3743A_PUR_0K5_OHM_CS_OFF`|0.5 kΩ in CSy off time |
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|`IS31FL3743A_PUR_1K_OHM_CS_OFF` |1 kΩ in CSy off time |
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|`IS31FL3743A_PUR_2K_OHM_CS_OFF` |2 kΩ in CSy off time (default)|
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|`IS31FL3743A_PUR_1K_OHM` |1 kΩ |
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|`IS31FL3743A_PUR_2K_OHM` |2 kΩ |
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|`IS31FL3743A_PUR_4K_OHM` |4 kΩ |
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|`IS31FL3743A_PUR_8K_OHM` |8 kΩ |
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### Global Current Control {#global-current-control}
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This setting controls the current sunk by the `CSy` 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 IS31FL3743A_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 is31fl3743a_led_t PROGMEM g_is31fl3743a_leds[IS31FL3743A_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 is31fl3743a_led_t PROGMEM g_is31fl3743a_leds[IS31FL3743A_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 is31fl3743a_led_t` {#api-is31fl3743a-led-t}
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Contains the PWM register addresses for a single RGB LED.
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#### Members {#api-is31fl3743a-led-t-members}
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- `uint8_t driver`
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The driver index of the LED, from 0 to 3.
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- `uint8_t r`
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The output PWM register address for the LED's red channel (RGB driver only).
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- `uint8_t g`
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The output PWM register address for the LED's green channel (RGB driver only).
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- `uint8_t b`
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The output PWM register address for the LED's blue channel (RGB driver only).
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- `uint8_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 is31fl3743a_init(uint8_t index)` {#api-is31fl3743a-init}
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Initialize the LED driver. This function should be called first.
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#### Arguments {#api-is31fl3743a-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 is31fl3743a_write_register(uint8_t index, uint8_t reg, uint8_t data)` {#api-is31fl3743a-write-register}
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Set the value of the given register.
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#### Arguments {#api-is31fl3743a-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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### `void is31fl3743a_select_page(uint8_t index, uint8_t page)` {#api-is31fl3743a-select-page}
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Change the current page for configuring the LED driver.
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#### Arguments {#api-is31fl3743a-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 is31fl3743a_set_color(int index, uint8_t red, uint8_t green, uint8_t blue)` {#api-is31fl3743a-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 `is31fl3743a_update_pwm_buffers()` after you are finished.
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#### Arguments {#api-is31fl3743a-set-color-arguments}
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- `int index`
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The LED index (ie. the index into the `g_is31fl3743a_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 is31fl3743a_set_color_all(uint8_t red, uint8_t green, uint8_t blue)` {#api-is31fl3743a-set-color-all}
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Set the color of all LEDs (RGB driver only).
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#### Arguments {#api-is31fl3743a-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 is31fl3743a_set_value(int index, uint8_t value)` {#api-is31fl3743a-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 `is31fl3743a_update_pwm_buffers()` after you are finished.
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#### Arguments {#api-is31fl3743a-set-value-arguments}
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- `int index`
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The LED index (ie. the index into the `g_is31fl3743a_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 is31fl3743a_set_value_all(uint8_t value)` {#api-is31fl3743a-set-value-all}
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Set the brightness of all LEDs (single-color driver only).
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#### Arguments {#api-is31fl3743a-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 is31fl3743a_set_scaling_register(uint8_t index, uint8_t red, uint8_t green, uint8_t blue)` {#api-is31fl3743a-set-scaling-register-rgb}
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Configure the scaling registers for a single LED (RGB driver only). This function does not immediately update the LEDs; call `is31fl3743a_update_scaling_registers()` after you are finished.
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#### Arguments {#api-is31fl3743a-set-scaling-register-rgb-arguments}
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- `uint8_t index`
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The LED index (ie. the index into the `g_is31fl3743a_leds` array).
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- `uint8_t red`
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The scaling value for the red channel.
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- `uint8_t green`
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The scaling value for the green channel.
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- `uint8_t blue`
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The scaling value for the blue channel.
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---
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### `void is31fl3743a_set_scaling_register(uint8_t index, uint8_t value)` {#api-is31fl3743a-set-scaling-register-mono}
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Configure the scaling register for a single LED (single-color driver only). This function does not immediately update the LEDs; call `is31fl3743a_update_scaling_registers()` after you are finished.
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#### Arguments {#api-is31fl3743a-set-scaling-register-mono-arguments}
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- `uint8_t index`
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The LED index (ie. the index into the `g_is31fl3743a_leds` array).
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- `uint8_t value`
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The scaling value for the LED.
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---
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### `void is31fl3743a_update_pwm_buffers(uint8_t index)` {#api-is31fl3743a-update-pwm-buffers}
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Flush the PWM values to the LED driver.
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#### Arguments {#api-is31fl3743a-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 is31fl3743a_update_scaling_registers(uint8_t index)` {#api-is31fl3743a-update-scaling-registers}
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Flush the scaling register values to the LED driver.
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#### Arguments {#api-is31fl3743a-update-scaling-registers-arguments}
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- `uint8_t index`
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The driver index.
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