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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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8
src/rp2040/gpio.h
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@@ -19,6 +19,14 @@ struct gpio_in gpio_in_setup(uint8_t pin, int8_t pull_up);
void gpio_in_reset(struct gpio_in g, int8_t pull_up);
uint8_t gpio_in_read(struct gpio_in g);
struct gpio_pwm {
void *reg;
uint8_t shift;
uint32_t mask;
};
struct gpio_pwm gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val);
void gpio_pwm_write(struct gpio_pwm g, uint32_t val);
struct gpio_adc {
uint8_t chan;
};