[Core] PWM Backlight for RP2040 (#17706)
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@ -6,6 +6,7 @@ The following table shows the current driver status for peripherals on RP2040 MC
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| ---------------------------------------------------------------- | ---------------------------------------------- |
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| ---------------------------------------------------------------- | ---------------------------------------------- |
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| [ADC driver](adc_driver.md) | Support planned (no ETA) |
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| [ADC driver](adc_driver.md) | Support planned (no ETA) |
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| [Audio](audio_driver.md) | Support planned (no ETA) |
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| [Audio](audio_driver.md) | Support planned (no ETA) |
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| [Backlight](feature_backlight.md) | :heavy_check_mark: |
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| [I2C driver](i2c_driver.md) | :heavy_check_mark: |
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| [I2C driver](i2c_driver.md) | :heavy_check_mark: |
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| [SPI driver](spi_driver.md) | :heavy_check_mark: |
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| [SPI driver](spi_driver.md) | :heavy_check_mark: |
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| [WS2812 driver](ws2812_driver.md) | :heavy_check_mark: using `PIO` driver |
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| [WS2812 driver](ws2812_driver.md) | :heavy_check_mark: using `PIO` driver |
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@ -20,6 +20,7 @@
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PAL_MODE 2
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#define ADC_PIN A0
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#define ADC_PIN A0
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@ -20,6 +20,7 @@
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PAL_MODE 2
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#define ADC_PIN A0
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#define ADC_PIN A0
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@ -20,6 +20,7 @@
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_DRIVER PWMD5
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PWM_CHANNEL 1
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#define BACKLIGHT_PAL_MODE 2
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#define ADC_PIN A0
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#define ADC_PIN A0
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@ -13,3 +13,6 @@
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP25
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP25
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U
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#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U
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#define BACKLIGHT_PWM_DRIVER PWMD4
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#define BACKLIGHT_PWM_CHANNEL RP2040_PWM_CHANNEL_B
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@ -0,0 +1,9 @@
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// Copyright 2022 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#define HAL_USE_I2C TRUE
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#define HAL_USE_PWM TRUE
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#include_next <halconf.h>
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@ -6,7 +6,10 @@
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"cols": ["GP4"],
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"cols": ["GP4"],
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"rows": ["GP5"]
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"rows": ["GP5"]
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},
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},
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"backlight": {
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"pin": "GP25"
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},
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"rgblight": {
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"rgblight": {
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"pin": "A1"
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"pin": "GP25"
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}
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}
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}
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}
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@ -0,0 +1,9 @@
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// Copyright 2022 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include_next "mcuconf.h"
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#undef RP_PWM_USE_PWM4
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#define RP_PWM_USE_PWM4 TRUE
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@ -78,6 +78,19 @@
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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/*
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* PWM driver system settings.
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*/
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#define RP_PWM_USE_PWM0 FALSE
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#define RP_PWM_USE_PWM1 FALSE
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#define RP_PWM_USE_PWM2 FALSE
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#define RP_PWM_USE_PWM3 FALSE
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#define RP_PWM_USE_PWM4 FALSE
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#define RP_PWM_USE_PWM5 FALSE
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#define RP_PWM_USE_PWM6 FALSE
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#define RP_PWM_USE_PWM7 FALSE
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#define RP_PWM_IRQ_WRAP_NUMBER_PRIORITY 3
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/*
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/*
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* I2C driver system settings.
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* I2C driver system settings.
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*/
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*/
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@ -78,6 +78,19 @@
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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/*
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* PWM driver system settings.
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*/
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#define RP_PWM_USE_PWM0 FALSE
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#define RP_PWM_USE_PWM1 FALSE
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#define RP_PWM_USE_PWM2 FALSE
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#define RP_PWM_USE_PWM3 FALSE
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#define RP_PWM_USE_PWM4 FALSE
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#define RP_PWM_USE_PWM5 FALSE
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#define RP_PWM_USE_PWM6 FALSE
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#define RP_PWM_USE_PWM7 FALSE
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#define RP_PWM_IRQ_WRAP_NUMBER_PRIORITY 3
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/*
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/*
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* I2C driver system settings.
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* I2C driver system settings.
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*/
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*/
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@ -78,6 +78,19 @@
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_SPI1_DMA_PRIORITY 1
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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#define RP_SPI_DMA_ERROR_HOOK(spip)
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/*
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* PWM driver system settings.
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*/
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#define RP_PWM_USE_PWM0 FALSE
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#define RP_PWM_USE_PWM1 FALSE
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#define RP_PWM_USE_PWM2 FALSE
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#define RP_PWM_USE_PWM3 FALSE
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#define RP_PWM_USE_PWM4 FALSE
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#define RP_PWM_USE_PWM5 FALSE
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#define RP_PWM_USE_PWM6 FALSE
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#define RP_PWM_USE_PWM7 FALSE
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#define RP_PWM_IRQ_WRAP_NUMBER_PRIORITY 3
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/*
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/*
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* I2C driver system settings.
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* I2C driver system settings.
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*/
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*/
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@ -28,6 +28,10 @@
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# define USE_GPIOV1
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# define USE_GPIOV1
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# define PAL_OUTPUT_TYPE_OPENDRAIN _Static_assert(0, "RP2040 has no Open Drain GPIO configuration, setting this is not possible");
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# define PAL_OUTPUT_TYPE_OPENDRAIN _Static_assert(0, "RP2040 has no Open Drain GPIO configuration, setting this is not possible");
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# define BACKLIGHT_PAL_MODE (PAL_MODE_ALTERNATE_PWM | PAL_RP_PAD_DRIVE12 | PAL_RP_GPIO_OE)
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# define BACKLIGHT_PWM_COUNTER_FREQUENCY 1000000
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# define BACKLIGHT_PWM_PERIOD BACKLIGHT_PWM_COUNTER_FREQUENCY / 2048
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# define usb_lld_endpoint_fields
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# define usb_lld_endpoint_fields
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# define I2C1_SCL_PAL_MODE (PAL_MODE_ALTERNATE_I2C | PAL_RP_PAD_SLEWFAST | PAL_RP_PAD_PUE | PAL_RP_PAD_DRIVE4)
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# define I2C1_SCL_PAL_MODE (PAL_MODE_ALTERNATE_I2C | PAL_RP_PAD_SLEWFAST | PAL_RP_PAD_PUE | PAL_RP_PAD_DRIVE4)
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@ -35,3 +35,8 @@
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#define GP28 28U
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#define GP28 28U
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#define GP29 29U
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#define GP29 29U
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#define GP30 30U
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#define GP30 30U
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/* Aliases for GPIO PWM channels - every pin has at least one PWM channel
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* assigned */
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#define RP2040_PWM_CHANNEL_A 1U
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#define RP2040_PWM_CHANNEL_B 2U
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@ -40,16 +40,22 @@
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# endif
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# endif
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#endif
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#endif
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static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
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#ifndef BACKLIGHT_PWM_COUNTER_FREQUENCY
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256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
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# define BACKLIGHT_PWM_COUNTER_FREQUENCY 0xFFFF
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NULL, /* Breathing Callback */
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#endif
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{ /* Default all channels to disabled - Channels will be configured durring init */
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{PWM_OUTPUT_DISABLED, NULL},
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#ifndef BACKLIGHT_PWM_PERIOD
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{PWM_OUTPUT_DISABLED, NULL},
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# define BACKLIGHT_PWM_PERIOD 256
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{PWM_OUTPUT_DISABLED, NULL},
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#endif
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{PWM_OUTPUT_DISABLED, NULL}},
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0, /* HW dependent part.*/
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static PWMConfig pwmCFG = {
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0};
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.frequency = BACKLIGHT_PWM_COUNTER_FREQUENCY, /* PWM clock frequency */
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.period = BACKLIGHT_PWM_PERIOD, /* PWM period in counter ticks. e.g. clock frequency is 10KHz, period is 256 ticks then t_period is 25.6ms */
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};
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#ifdef BACKLIGHT_BREATHING
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static virtual_timer_t breathing_vt;
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#endif
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// See http://jared.geek.nz/2013/feb/linear-led-pwm
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// See http://jared.geek.nz/2013/feb/linear-led-pwm
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static uint16_t cie_lightness(uint16_t v) {
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static uint16_t cie_lightness(uint16_t v) {
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@ -60,11 +66,12 @@ static uint16_t cie_lightness(uint16_t v) {
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// to get a useful result with integer division, we shift left in the expression above
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// to get a useful result with integer division, we shift left in the expression above
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// and revert what we've done again after squaring.
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// and revert what we've done again after squaring.
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y = y * y * y >> 8;
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y = y * y * y >> 8;
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if (y > 0xFFFFUL) // prevent overflow
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if (y > 0xFFFFUL) { // prevent overflow
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return 0xFFFFU;
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return 0xFFFFU;
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else
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} else {
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return (uint16_t)y;
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return (uint16_t)y;
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}
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}
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}
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}
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}
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static uint32_t rescale_limit_val(uint32_t val) {
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static uint32_t rescale_limit_val(uint32_t val) {
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@ -85,6 +92,7 @@ void backlight_init_ports(void) {
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backlight_set(get_backlight_level());
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backlight_set(get_backlight_level());
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#ifdef BACKLIGHT_BREATHING
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#ifdef BACKLIGHT_BREATHING
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chVTObjectInit(&breathing_vt);
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if (is_backlight_breathing()) {
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if (is_backlight_breathing()) {
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breathing_enable();
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breathing_enable();
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}
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}
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@ -92,7 +100,9 @@ void backlight_init_ports(void) {
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}
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}
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void backlight_set(uint8_t level) {
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void backlight_set(uint8_t level) {
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if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
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if (level > BACKLIGHT_LEVELS) {
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level = BACKLIGHT_LEVELS;
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}
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if (level == 0) {
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if (level == 0) {
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// Turn backlight off
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// Turn backlight off
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@ -115,20 +125,19 @@ void backlight_task(void) {}
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*/
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*/
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static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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void breathing_callback(PWMDriver *pwmp);
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static void breathing_callback(virtual_timer_t *vtp, void *p);
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bool is_breathing(void) {
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bool is_breathing(void) {
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return pwmCFG.callback != NULL;
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return chVTIsArmed(&breathing_vt);
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}
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}
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void breathing_enable(void) {
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void breathing_enable(void) {
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pwmCFG.callback = breathing_callback;
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/* Update frequency is 256Hz -> 3906us intervals */
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pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
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chVTSetContinuous(&breathing_vt, TIME_US2I(3906), breathing_callback, NULL);
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}
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}
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void breathing_disable(void) {
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void breathing_disable(void) {
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pwmCFG.callback = NULL;
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chVTReset(&breathing_vt);
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pwmDisablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
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// Restore backlight level
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// Restore backlight level
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backlight_set(get_backlight_level());
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backlight_set(get_backlight_level());
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@ -139,7 +148,7 @@ static inline uint16_t scale_backlight(uint16_t v) {
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return v / BACKLIGHT_LEVELS * get_backlight_level();
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return v / BACKLIGHT_LEVELS * get_backlight_level();
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}
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}
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void breathing_callback(PWMDriver *pwmp) {
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static void breathing_callback(virtual_timer_t *vtp, void *p) {
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uint8_t breathing_period = get_breathing_period();
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uint8_t breathing_period = get_breathing_period();
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uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
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uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
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@ -150,7 +159,7 @@ void breathing_callback(PWMDriver *pwmp) {
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uint32_t duty = cie_lightness(rescale_limit_val(scale_backlight(breathing_table[index] * 256)));
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uint32_t duty = cie_lightness(rescale_limit_val(scale_backlight(breathing_table[index] * 256)));
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chSysLockFromISR();
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chSysLockFromISR();
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pwmEnableChannelI(pwmp, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
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pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
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chSysUnlockFromISR();
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chSysUnlockFromISR();
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}
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}
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