[Core] Adjust PWM hardware audio driver for RP2040 (#17723)
parent
efe520645e
commit
19145704e4
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@ -159,7 +159,6 @@ A configuration example for the STM32F103C8 would be:
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//halconf.h:
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#define HAL_USE_PWM TRUE
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#define HAL_USE_PAL TRUE
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#define HAL_USE_GPT TRUE
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#include_next <halconf.h>
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```
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@ -168,8 +167,6 @@ A configuration example for the STM32F103C8 would be:
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#include_next <mcuconf.h>
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#undef STM32_PWM_USE_TIM1
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#define STM32_PWM_USE_TIM1 TRUE
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#undef STM32_GPT_USE_TIM4
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#define STM32_GPT_USE_TIM4 TRUE
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```
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If we now target pin A8, looking through the data-sheet of the STM32F103C8, for the timers and alternate functions
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@ -184,7 +181,6 @@ with all this information, the configuration would contain these lines:
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#define AUDIO_PIN A8
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#define AUDIO_PWM_DRIVER PWMD1
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#define AUDIO_PWM_CHANNEL 1
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#define AUDIO_STATE_TIMER GPTD4
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```
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ChibiOS uses GPIOv1 for the F103, which only knows of one alternate function.
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@ -207,15 +203,15 @@ You can also change the timer used for software PWM by defining the driver. For
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While not an exhaustive list, the following table provides the scenarios that have been partially validated:
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| | DAC basic | DAC additive | PWM hardware | PWM software |
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|--------------------------|--------------------|--------------------|--------------------|--------------------|
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| | DAC basic | DAC additive | PWM hardware | PWM software |
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| ------------------------ | ------------------ | ------------------ | ------------------ | ------------------ |
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| Atmega32U4 | :o: | :o: | :heavy_check_mark: | :o: |
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| RP2040 | :x: | :x: | :heavy_check_mark: | ? |
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| STM32F103C8 (bluepill) | :x: | :x: | :heavy_check_mark: | :heavy_check_mark: |
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| STM32F303CCT6 (proton-c) | :heavy_check_mark: | :heavy_check_mark: | ? | :heavy_check_mark: |
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| STM32F405VG | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
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| L0xx | :x: (no Tim8) | ? | ? | ? |
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:heavy_check_mark: : works and was tested
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:o: : does not apply
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:x: : not supported by MCU
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@ -2,10 +2,10 @@
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The following table shows the current driver status for peripherals on RP2040 MCUs:
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| System | Support |
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| System | Support |
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| ---------------------------------------------------------------- | ---------------------------------------------- |
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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#pwm-hardware) | :heavy_check_mark: |
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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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| [SPI driver](spi_driver.md) | :heavy_check_mark: |
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@ -60,7 +60,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define AUDIO_PWM_DRIVER PWMD3
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#define AUDIO_PWM_CHANNEL 4
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#define AUDIO_PWM_PAL_MODE 2
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#define AUDIO_STATE_TIMER GPTD4
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/* serial.c configuration for split keyboard */
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#undef SOFT_SERIAL_PIN
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@ -21,6 +21,5 @@
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#define HAL_USE_SPI TRUE
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#define SPI_USE_WAIT TRUE
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#define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
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#define HAL_USE_GPT TRUE
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#include_next <halconf.h>
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@ -38,8 +38,5 @@
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#undef STM32_SERIAL_USE_USART2
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#define STM32_SERIAL_USE_USART2 TRUE
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#undef STM32_GPT_USE_TIM4
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#define STM32_GPT_USE_TIM4 TRUE
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#undef STM32_ST_USE_TIMER
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#define STM32_ST_USE_TIMER 5
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@ -56,7 +56,6 @@
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#define AUDIO_PWM_DRIVER PWMD4
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#define AUDIO_PWM_CHANNEL 2
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#define AUDIO_PWM_PAL_MODE 2
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#define AUDIO_STATE_TIMER GPTD3
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#define AUDIO_INIT_DELAY
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#define AUDIO_ENABLE_TONE_MULTIPLEXING
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#define AUDIO_TONE_MULTIPLEXING_RATE_DEFAULT 10
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@ -17,7 +17,6 @@
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#define HAL_USE_PWM TRUE
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#define HAL_USE_PAL TRUE
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#define HAL_USE_GPT TRUE
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#define HAL_USE_SERIAL TRUE
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// #define HAL_USE_I2C TRUE
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#define HAL_USE_SPI TRUE
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@ -36,8 +36,5 @@
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#undef STM32_SERIAL_USE_USART1
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#define STM32_SERIAL_USE_USART1 TRUE
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#undef STM32_GPT_USE_TIM3
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#define STM32_GPT_USE_TIM3 TRUE
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#undef STM32_ST_USE_TIMER
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#define STM32_ST_USE_TIMER 5
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@ -27,7 +27,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define AUDIO_PWM_DRIVER PWMD2
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#define AUDIO_PWM_CHANNEL 3
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#define AUDIO_PWM_PAL_MODE 1
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#define AUDIO_STATE_TIMER GPTD1
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#define AUDIO_CLICKY
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#define AUDIO_CLICKY_FREQ_RANDOMNESS 1.5f
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@ -23,6 +23,5 @@
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#pragma once
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#define HAL_USE_PWM TRUE
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#define HAL_USE_GPT TRUE
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#include_next <halconf.h>
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@ -23,8 +23,5 @@
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#undef STM32_PWM_USE_TIM4
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#define STM32_PWM_USE_TIM4 TRUE
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#undef STM32_GPT_USE_TIM1
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#define STM32_GPT_USE_TIM1 TRUE
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#undef STM32_ST_USE_TIMER
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#define STM32_ST_USE_TIMER 5
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@ -16,3 +16,7 @@
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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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#define AUDIO_PIN GP16
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#define AUDIO_PWM_DRIVER PWMD0
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#define AUDIO_PWM_CHANNEL RP2040_PWM_CHANNEL_A
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@ -5,5 +5,8 @@
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#include_next "mcuconf.h"
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#undef RP_PWM_USE_PWM0
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#define RP_PWM_USE_PWM0 TRUE
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#undef RP_PWM_USE_PWM4
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#define RP_PWM_USE_PWM4 TRUE
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@ -53,7 +53,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define AUDIO_PWM_DRIVER PWMD3
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#define AUDIO_PWM_CHANNEL 4
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#define AUDIO_PWM_PAL_MODE 2
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#define AUDIO_STATE_TIMER GPTD4
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/* serial.c configuration for split keyboard */
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#define SERIAL_USART_FULL_DUPLEX // Enable full duplex operation mode.
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@ -21,6 +21,5 @@
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#define HAL_USE_SPI TRUE
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#define SPI_USE_WAIT TRUE
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#define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
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#define HAL_USE_GPT TRUE
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#include_next <halconf.h>
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@ -38,8 +38,5 @@
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#undef STM32_SERIAL_USE_USART2
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#define STM32_SERIAL_USE_USART2 TRUE
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#undef STM32_GPT_USE_TIM4
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#define STM32_GPT_USE_TIM4 TRUE
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#undef STM32_ST_USE_TIMER
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#define STM32_ST_USE_TIMER 5
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@ -46,7 +46,6 @@
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#define AUDIO_PWM_PAL_MODE 1
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#define AUDIO_PWM_DRIVER PWMD1
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#define AUDIO_PWM_CHANNEL 1
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#define AUDIO_STATE_TIMER GPTD4
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/* RGB LED */
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#define RGB_DI_PIN B1
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@ -18,9 +18,6 @@
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/* PWM for AUDIO and RGB LED */
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#define HAL_USE_PWM TRUE
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/* GPT and PAL for Audio */
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#define HAL_USE_GPT TRUE
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#define HAL_USE_PAL TRUE
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/* I2C for OLED display */
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#define HAL_USE_I2C TRUE
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@ -21,9 +21,6 @@
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/* TIM1 PWM used for audio driver */
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#undef STM32_PWM_USE_TIM1
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#define STM32_PWM_USE_TIM1 TRUE
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/* TIM5 GPT used for audio driver */
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#undef STM32_GPT_USE_TIM4
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#define STM32_GPT_USE_TIM4 TRUE
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/* TIM3 used for WS2812 driver */
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#undef STM32_PWM_USE_TIM3
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@ -28,10 +28,18 @@
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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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/* 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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# 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 AUDIO_PWM_PAL_MODE (PAL_MODE_ALTERNATE_PWM | PAL_RP_PAD_DRIVE12 | PAL_RP_GPIO_OE)
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# define AUDIO_PWM_COUNTER_FREQUENCY 500000
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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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@ -55,6 +63,7 @@
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# define USE_GPIOV1
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# define PAL_MODE_ALTERNATE_OPENDRAIN PAL_MODE_STM32_ALTERNATE_OPENDRAIN
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# define PAL_MODE_ALTERNATE_PUSHPULL PAL_MODE_STM32_ALTERNATE_PUSHPULL
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# define AUDIO_PWM_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
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# else
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# define PAL_OUTPUT_TYPE_OPENDRAIN PAL_STM32_OTYPE_OPENDRAIN
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# define PAL_OUTPUT_TYPE_PUSHPULL PAL_STM32_OTYPE_PUSHPULL
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@ -76,6 +85,7 @@
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# define USE_I2CV1
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# define PAL_MODE_ALTERNATE_OPENDRAIN PAL_MODE_GD32_ALTERNATE_OPENDRAIN
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# define PAL_MODE_ALTERNATE_PUSHPULL PAL_MODE_GD32_ALTERNATE_PUSHPULL
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# define AUDIO_PWM_PAL_MODE PAL_MODE_GD32_ALTERNATE_PUSHPULL
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# endif
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#endif
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@ -1,29 +1,15 @@
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/* Copyright 2020 Jack Humbert
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* Copyright 2020 JohSchneider
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Copyright 2022 Stefan Kerkmann
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// Copyright 2020 Jack Humbert
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// Copyright 2020 JohSchneider
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Audio Driver: PWM
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the duty-cycle is always kept at 50%, and the pwm-period is adjusted to match the frequency of a note to be played back.
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this driver uses the chibios-PWM system to produce a square-wave on specific output pins that are connected to the PWM hardware.
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The hardware directly toggles the pin via its alternate function. see your MCUs data-sheet for which pin can be driven by what timer - looking for TIMx_CHy and the corresponding alternate function.
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*/
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// Audio Driver: PWM the duty-cycle is always kept at 50%, and the pwm-period is
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// adjusted to match the frequency of a note to be played back. This driver uses
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// the chibios-PWM system to produce a square-wave on specific output pins that
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// are connected to the PWM hardware. The hardware directly toggles the pin via
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// its alternate function. see your MCUs data-sheet for which pin can be driven
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// by what timer - looking for TIMx_CHy and the corresponding alternate
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// function.
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#include "audio.h"
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#include "ch.h"
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@ -33,53 +19,36 @@ The hardware directly toggles the pin via its alternate function. see your MCUs
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# error "Audio feature enabled, but no pin selected - see docs/feature_audio under the ARM PWM settings"
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#endif
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#if !defined(AUDIO_PWM_COUNTER_FREQUENCY)
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# define AUDIO_PWM_COUNTER_FREQUENCY 100000
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#endif
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extern bool playing_note;
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extern bool playing_melody;
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extern uint8_t note_timbre;
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static PWMConfig pwmCFG = {
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.frequency = 100000, /* PWM clock frequency */
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// CHIBIOS-BUG? can't set the initial period to <2, or the pwm (hard or software) takes ~130ms with .frequency=500000 for a pwmChangePeriod to take effect; with no output=silence in the meantime
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.period = 2, /* initial PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
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.callback = NULL, /* no callback, the hardware directly toggles the pin */
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.channels =
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{
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#if AUDIO_PWM_CHANNEL == 4
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{PWM_OUTPUT_DISABLED, NULL}, /* channel 0 -> TIMx_CH1 */
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{PWM_OUTPUT_DISABLED, NULL}, /* channel 1 -> TIMx_CH2 */
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{PWM_OUTPUT_DISABLED, NULL}, /* channel 2 -> TIMx_CH3 */
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{PWM_OUTPUT_ACTIVE_HIGH, NULL} /* channel 3 -> TIMx_CH4 */
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#elif AUDIO_PWM_CHANNEL == 3
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* TIMx_CH3 */
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{PWM_OUTPUT_DISABLED, NULL}
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#elif AUDIO_PWM_CHANNEL == 2
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* TIMx_CH2 */
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}
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#else /*fallback to CH1 */
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* TIMx_CH1 */
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL},
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{PWM_OUTPUT_DISABLED, NULL}
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#endif
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},
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};
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static PWMConfig pwmCFG = {.frequency = AUDIO_PWM_COUNTER_FREQUENCY, /* PWM clock frequency */
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.period = 2,
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.callback = NULL,
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.channels = {[(AUDIO_PWM_CHANNEL - 1)] = {.mode = PWM_OUTPUT_ACTIVE_HIGH, .callback = NULL}}};
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static float channel_1_frequency = 0.0f;
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void channel_1_set_frequency(float freq) {
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void channel_1_set_frequency(float freq) {
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channel_1_frequency = freq;
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if (freq <= 0.0) // a pause/rest has freq=0
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if (freq <= 0.0) {
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// a pause/rest has freq=0
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return;
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}
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pwmcnt_t period = (pwmCFG.frequency / freq);
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pwmChangePeriod(&AUDIO_PWM_DRIVER, period);
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pwmEnableChannel(&AUDIO_PWM_DRIVER, AUDIO_PWM_CHANNEL - 1,
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// adjust the duty-cycle so that the output is for 'note_timbre' duration HIGH
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PWM_PERCENTAGE_TO_WIDTH(&AUDIO_PWM_DRIVER, (100 - note_timbre) * 100));
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chSysLockFromISR();
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pwmChangePeriodI(&AUDIO_PWM_DRIVER, period);
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pwmEnableChannelI(&AUDIO_PWM_DRIVER, AUDIO_PWM_CHANNEL - 1,
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// adjust the duty-cycle so that the output is for 'note_timbre' duration HIGH
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PWM_PERCENTAGE_TO_WIDTH(&AUDIO_PWM_DRIVER, (100 - note_timbre) * 100));
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chSysUnlockFromISR();
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}
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float channel_1_get_frequency(void) {
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@ -95,54 +64,53 @@ void channel_1_stop(void) {
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pwmStop(&AUDIO_PWM_DRIVER);
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}
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static void gpt_callback(GPTDriver *gptp);
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GPTConfig gptCFG = {
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/* a whole note is one beat, which is - per definition in musical_notes.h - set to 64
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the longest note is BREAVE_DOT=128+64=192, the shortest SIXTEENTH=4
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the tempo (which might vary!) is in bpm (beats per minute)
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therefore: if the timer ticks away at .frequency = (60*64)Hz,
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and the .interval counts from 64 downwards - audio_update_state is
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called just often enough to not miss any notes
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*/
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.frequency = 60 * 64,
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.callback = gpt_callback,
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};
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static virtual_timer_t audio_vt;
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static void audio_callback(virtual_timer_t *vtp, void *p);
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void audio_driver_initialize(void) {
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pwmStart(&AUDIO_PWM_DRIVER, &pwmCFG);
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// connect the AUDIO_PIN to the PWM hardware
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#if defined(USE_GPIOV1) // STM32F103C8
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palSetLineMode(AUDIO_PIN, PAL_MODE_ALTERNATE_PUSHPULL);
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#else // GPIOv2 (or GPIOv3 for f4xx, which is the same/compatible at this command)
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palSetLineMode(AUDIO_PIN, PAL_MODE_ALTERNATE(AUDIO_PWM_PAL_MODE));
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#endif
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gptStart(&AUDIO_STATE_TIMER, &gptCFG);
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}
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void audio_driver_start(void) {
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channel_1_stop();
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channel_1_start();
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if (playing_note || playing_melody) {
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gptStartContinuous(&AUDIO_STATE_TIMER, 64);
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}
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}
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||||
|
||||
void audio_driver_stop(void) {
|
||||
channel_1_stop();
|
||||
gptStopTimer(&AUDIO_STATE_TIMER);
|
||||
}
|
||||
|
||||
/* a regular timer task, that checks the note to be currently played
|
||||
* and updates the pwm to output that frequency
|
||||
*/
|
||||
static void gpt_callback(GPTDriver *gptp) {
|
||||
// a regular timer task, that checks the note to be currently played and updates
|
||||
// the pwm to output that frequency.
|
||||
static void audio_callback(virtual_timer_t *vtp, void *p) {
|
||||
float freq; // TODO: freq_alt
|
||||
|
||||
if (audio_update_state()) {
|
||||
freq = audio_get_processed_frequency(0); // freq_alt would be index=1
|
||||
channel_1_set_frequency(freq);
|
||||
}
|
||||
|
||||
chSysLockFromISR();
|
||||
chVTSetI(&audio_vt, TIME_MS2I(16), audio_callback, NULL);
|
||||
chSysUnlockFromISR();
|
||||
}
|
||||
|
||||
void audio_driver_initialize(void) {
|
||||
pwmStart(&AUDIO_PWM_DRIVER, &pwmCFG);
|
||||
|
||||
// connect the AUDIO_PIN to the PWM hardware
|
||||
#if defined(USE_GPIOV1) // STM32F103C8, RP2040
|
||||
palSetLineMode(AUDIO_PIN, AUDIO_PWM_PAL_MODE);
|
||||
#else // GPIOv2 (or GPIOv3 for f4xx, which is the same/compatible at this command)
|
||||
palSetLineMode(AUDIO_PIN, PAL_MODE_ALTERNATE(AUDIO_PWM_PAL_MODE));
|
||||
#endif
|
||||
|
||||
chVTObjectInit(&audio_vt);
|
||||
}
|
||||
|
||||
void audio_driver_start(void) {
|
||||
channel_1_stop();
|
||||
channel_1_start();
|
||||
|
||||
if ((playing_note || playing_melody) && !chVTIsArmed(&audio_vt)) {
|
||||
// a whole note is one beat, which is - per definition in
|
||||
// musical_notes.h - set to 64 the longest note is
|
||||
// BREAVE_DOT=128+64=192, the shortest SIXTEENTH=4 the tempo (which
|
||||
// might vary!) is in bpm (beats per minute) therefore: if the timer
|
||||
// ticks away at 64Hz (~16.6ms) audio_update_state is called just often
|
||||
// enough to not miss any notes
|
||||
chVTSet(&audio_vt, TIME_MS2I(16), audio_callback, NULL);
|
||||
}
|
||||
}
|
||||
|
||||
void audio_driver_stop(void) {
|
||||
channel_1_stop();
|
||||
chVTReset(&audio_vt);
|
||||
}
|
||||
|
|
|
@ -35,8 +35,3 @@
|
|||
#define GP28 28U
|
||||
#define GP29 29U
|
||||
#define GP30 30U
|
||||
|
||||
/* Aliases for GPIO PWM channels - every pin has at least one PWM channel
|
||||
* assigned */
|
||||
#define RP2040_PWM_CHANNEL_A 1U
|
||||
#define RP2040_PWM_CHANNEL_B 2U
|
||||
|
|
Loading…
Reference in New Issue