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zephyr/drivers/display/Kconfig.nrf_led_matrix

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drivers: display: Add support for LED matrix driven by nRF SoC GPIOs Add a display driver and the corresponding devicetree binding for a LED matrix with rows and columns driven by nRF SoCs GPIOs. Such matrix can be found, for example, in the BBC micro:bit boards. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2021-12-03 21:44:41 +08:00
# Copyright (c) 2021, Nordic Semiconductor ASA
# SPDX-License-Identifier: Apache-2.0
config DISPLAY_NRF_LED_MATRIX
bool "LED matrix driven by GPIOs"
drivers: display: Update Kconfig * Utilize DT_HAS_<COMPAT>_ENABLED for devicetree based drivers * Move to using 'select SPI' instead of 'depends on' (see commit df81fef94483da9f2811d48088affbcfd61ab18c for more details) Signed-off-by: Kumar Gala <galak@kernel.org>
2022-08-08 23:18:55 +08:00
default y
depends on DT_HAS_NORDIC_NRF_LED_MATRIX_ENABLED
drivers: display: Add support for LED matrix driven by nRF SoC GPIOs Add a display driver and the corresponding devicetree binding for a LED matrix with rows and columns driven by nRF SoCs GPIOs. Such matrix can be found, for example, in the BBC micro:bit boards. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2021-12-03 21:44:41 +08:00
select NRFX_GPIOTE
select NRFX_PPI if HAS_HW_NRF_PPI
help
Enable driver for a LED matrix with rows and columns driven by
drivers: display_nrf_led_matrix: Add option to light LEDs in groups Add a new DT property named "pixel-group-size" that allows users to configure the driver to refresh the matrix by illuminating multiple LEDs in particular rows simultaneously. This way the maximum possible brightness of the LEDs can be increased (as they can be lit longer) and the timer interrupt handler is executed less frequently, what results in decreased CPU load, but more GPIOTE/PPI channels needs to be allocated if the PWM peripheral cannot be used. Thus, it is left to users to select the configuration that suits them best. Update definitions of both the bbc_microbit boards with this new property, using the maximum available group size (to achieve maximum possible brightness). For v2, no new resources are used (only all channels in the already used PWM peripheral are now utilized). For v1, two more GPIOTE and PPI channels are allocated. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2021-12-20 20:15:56 +08:00
GPIOs. The driver allows setting one of 256 levels of brightness
(where 0 means off completely) for each of the LEDs independently.
drivers: display: Add support for LED matrix driven by nRF SoC GPIOs Add a display driver and the corresponding devicetree binding for a LED matrix with rows and columns driven by nRF SoCs GPIOs. Such matrix can be found, for example, in the BBC micro:bit boards. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2021-12-03 21:44:41 +08:00
Assignment of GPIOs to rows and columns and the mapping of those
to pixels are specified in properties of a "nordic,nrf-led-matrix"
compatible node in devicetree.
drivers: display_nrf_led_matrix: Add option to light LEDs in groups Add a new DT property named "pixel-group-size" that allows users to configure the driver to refresh the matrix by illuminating multiple LEDs in particular rows simultaneously. This way the maximum possible brightness of the LEDs can be increased (as they can be lit longer) and the timer interrupt handler is executed less frequently, what results in decreased CPU load, but more GPIOTE/PPI channels needs to be allocated if the PWM peripheral cannot be used. Thus, it is left to users to select the configuration that suits them best. Update definitions of both the bbc_microbit boards with this new property, using the maximum available group size (to achieve maximum possible brightness). For v2, no new resources are used (only all channels in the already used PWM peripheral are now utilized). For v1, two more GPIOTE and PPI channels are allocated. Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
2021-12-20 20:15:56 +08:00
The driver uses one TIMER instance and, depending on what is set in
devicetree, one PWM instance or one or more GPIOTE and PPI channels
(the latter value depends on the chosen pixel group size - the number
of LEDs in one row that can be lit simultaneously).