1 files changed, 47 insertions, 0 deletions
diff --git a/stm/led.c b/stm/led.c
new file mode 100644
index 000000000..a6255540f
--- /dev/null
+++ b/stm/led.c
@@ -0,0 +1,47 @@
+#include <stm32f4xx.h>
+#include <stm32f4xx_gpio.h>
+#include "led.h"
+
+#define PYB_LED_R_PORT (GPIOA)
+#define PYB_LED_R1_PIN (GPIO_Pin_8)
+#define PYB_LED_R2_PIN (GPIO_Pin_10)
+#define PYB_LED_G_PORT   (GPIOC)
+#define PYB_LED_G1_PIN (GPIO_Pin_4)
+#define PYB_LED_G2_PIN (GPIO_Pin_5)
+
+void led_init() {
+    // set the output high (so LED is off)
+    PYB_LED_R_PORT->BSRRL = PYB_LED_R1_PIN;
+    PYB_LED_R_PORT->BSRRL = PYB_LED_R2_PIN;
+    PYB_LED_G_PORT->BSRRL = PYB_LED_G1_PIN;
+    PYB_LED_G_PORT->BSRRL = PYB_LED_G2_PIN;
+    // make them open drain outputs
+    GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitStructure.GPIO_Pin = PYB_LED_R1_PIN | PYB_LED_R2_PIN;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
+    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
+    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
+    GPIO_Init(PYB_LED_R_PORT, &GPIO_InitStructure);
+    GPIO_InitStructure.GPIO_Pin = PYB_LED_G1_PIN | PYB_LED_G2_PIN;
+    GPIO_Init(PYB_LED_G_PORT, &GPIO_InitStructure);
+}
+
+void led_state(pyb_led_t led, int state) {
+    GPIO_TypeDef *port;
+    uint32_t pin;
+    switch (led) {
+        case PYB_LED_R1: port = PYB_LED_R_PORT; pin = PYB_LED_R1_PIN; break;
+        case PYB_LED_R2: port = PYB_LED_R_PORT; pin = PYB_LED_R2_PIN; break;
+        case PYB_LED_G1: port = PYB_LED_G_PORT; pin = PYB_LED_G1_PIN; break;
+        case PYB_LED_G2: port = PYB_LED_G_PORT; pin = PYB_LED_G2_PIN; break;
+        default: return;
+    }
+    if (state == 0) {
+        // LED off, output is high
+        port->BSRRL = pin;
+    } else {
+        // LED on, output is low
+        port->BSRRH = pin;
+    }
+}