samd21: Add support for hardware pwm

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/samd21/gpio.h b/src/samd21/gpio.h
index 41787b85..6c910da8 100644
--- a/src/samd21/gpio.h
+++ b/src/samd21/gpio.h
@@ -21,6 +21,12 @@ 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;
+};
+struct gpio_pwm gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val);
+void gpio_pwm_write(struct gpio_pwm g, uint8_t val);
+
 struct spi_config {
     uint32_t ctrla, baud;
 };