diff --git a/stmhal/mphalport.c b/stmhal/mphalport.c
index 3fd4395d60..82a345b8ad 100644
--- a/stmhal/mphalport.c
+++ b/stmhal/mphalport.c
@@ -119,6 +119,15 @@ void mp_hal_gpio_clock_enable(GPIO_TypeDef *gpio) {
     }
 }
 
+void mp_hal_gpio_config(GPIO_TypeDef *gpio, uint32_t pin, uint32_t mode, uint32_t pull, uint32_t alt) {
+    mp_hal_gpio_clock_enable(gpio);
+    gpio->MODER = (gpio->MODER & ~(3 << (2 * pin))) | ((mode & 3) << (2 * pin));
+    gpio->OTYPER = (gpio->OTYPER & ~(1 << pin)) | ((mode >> 2) << pin);
+    gpio->OSPEEDR = (gpio->OSPEEDR & ~(3 << (2 * pin))) | (2 << (2 * pin)); // full speed
+    gpio->PUPDR = (gpio->PUPDR & ~(3 << (2 * pin))) | (pull << (2 * pin));
+    gpio->AFR[pin >> 3] = (gpio->AFR[pin >> 3] & ~(15 << (4 * (pin & 7)))) | (alt << (4 * (pin & 7)));
+}
+
 bool mp_hal_gpio_set_af(const pin_obj_t *pin, GPIO_InitTypeDef *init, uint8_t fn, uint8_t unit) {
     mp_hal_gpio_clock_enable(pin->gpio);
 
diff --git a/stmhal/mphalport.h b/stmhal/mphalport.h
index 5373eb45a2..63b126112c 100644
--- a/stmhal/mphalport.h
+++ b/stmhal/mphalport.h
@@ -24,6 +24,7 @@
 #define GPIO_read_output_pin(gpio, pin) (((gpio)->ODR >> (pin)) & 1)
 
 void mp_hal_gpio_clock_enable(GPIO_TypeDef *gpio);
+void mp_hal_gpio_config(GPIO_TypeDef *gpio, uint32_t pin, uint32_t mode, uint32_t pull, uint32_t alt);
 bool mp_hal_gpio_set_af(const pin_obj_t *pin, GPIO_InitTypeDef *init, uint8_t fn, uint8_t unit);
 
 extern const unsigned char mp_hal_status_to_errno_table[4];
@@ -33,3 +34,12 @@ void mp_hal_set_interrupt_char(int c); // -1 to disable
 
 #define mp_hal_delay_ms HAL_Delay
 #define mp_hal_ticks_ms HAL_GetTick
+
+// C-level pin HAL
+#include "stmhal/pin.h"
+#define mp_hal_pin_obj_t pin_obj_t
+#define mp_hal_get_pin_obj(o) (pin_obj_t*)pin_find(o)
+#define mp_hal_pin_config_od(p) mp_hal_gpio_config((p)->gpio, (p)->pin, 5, 0, 0)
+#define mp_hal_pin_low(p) GPIO_clear_pin((p)->gpio, (p)->pin_mask)
+#define mp_hal_pin_od_high(p) GPIO_set_pin((p)->gpio, (p)->pin_mask)
+#define mp_hal_pin_read(p) GPIO_read_pin((p)->gpio, (p)->pin)