stm32: Add support for additional ADC3 ports on stm32f4

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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/stm32/gpio.h b/src/stm32/gpio.h
index c7602504..ad8a9979 100644
--- a/src/stm32/gpio.h
+++ b/src/stm32/gpio.h
@@ -22,6 +22,7 @@ void gpio_in_reset(struct gpio_in g, int32_t pull_up);
 uint8_t gpio_in_read(struct gpio_in g);
 
 struct gpio_adc {
+    void *adc;
     uint32_t chan;
 };
 struct gpio_adc gpio_adc_setup(uint32_t pin);