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rp2040: hardware PWM support

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This implements hardware PWM support for the rp2040. The maximum
value(100% duty) is set to 255 to match the other controllers. Cycle
time is clamped automatically, and uses the full 8.4 fractional range of
the rp2040 PWM block. This allows a maximum PWM frequency of 490kHz and
a minimum frequency of 1915 Hz.

Signed-off-by: Lasse Dalegaard <dalegaard@gmail.com>
This commit is contained in:
Lasse Dalegaard
2021-07-04 21:30:24 +02:00
committed by KevinOConnor
parent 4802c6d86a
commit 28f60f7ef6
4 changed files with 111 additions and 0 deletions
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src/rp2040/Makefile
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@@ -19,6 +19,7 @@ src-y += generic/timer_irq.c rp2040/timer.c rp2040/bootrom.c
src-$(CONFIG_USBSERIAL) += rp2040/usbserial.c generic/usb_cdc.c
src-$(CONFIG_USBSERIAL) += rp2040/chipid.c
src-$(CONFIG_SERIAL) += rp2040/serial.c generic/serial_irq.c
src-$(CONFIG_HAVE_GPIO_HARD_PWM) += rp2040/hard_pwm.c
# rp2040 stage2 building
$(OUT)stage2.o: lib/rp2040/boot_stage2/boot2_w25q080.S