diff --git a/blue-pill/blinky/bluepill.h b/blue-pill/blinky/bluepill.h
new file mode 100644
index 0000000..6277194
--- /dev/null
+++ b/blue-pill/blinky/bluepill.h
@@ -0,0 +1,65 @@
+#ifndef __BLUEPILL_H__
+#define __BLUEPILL_H__
+
+#include <stdint.h>
+
+#define PORTA	(volatile unsigned int *)0x40010800
+#define PORTB	(volatile unsigned int *)0x40010c00
+#define PORTC	(volatile unsigned int *)0x40011000
+#define PORTD	(volatile unsigned int *)0x40011400
+#define PORTE	(volatile unsigned int *)0x40011800
+
+#define RCC	(volatile unsigned int *)0x40021000
+
+/*
+ 
+	40011000	CRL
+	40011004	CRH
+	40011008	IDR
+	4001100c	ODR
+	40011010	BRR
+	40011012	LCKR
+
+ */
+typedef struct _GPIO {
+	uint32_t	CRL;	/* configuration register low */
+	uint32_t	CRH;	/* configuration register high */
+	uint32_t	IDR;	/* input data register */
+	uint32_t	ODR;	/* output data register */
+	uint32_t	BSRR;	/* bit set / reset register */
+	uint16_t	BRR;	/* reset register */
+	uint32_t	LCKR;	/* locking register */
+} GPIO;
+
+GPIO	*GPIO_A	 = (GPIO *)PORTA;
+GPIO	*GPIO_B  = (GPIO *)PORTB;
+GPIO	*GPIO_C  = (GPIO *)PORTC;
+GPIO	*GPIO_D  = (GPIO *)PORTD;
+GPIO	*GPIO_E  = (GPIO *)PORTE;
+
+const uint32_t	OUTPUT_MAX_2MHZ = 2;
+const uint32_t	OUTPUT_MAX_10MHZ = 1;
+const uint32_t	OUTPUT_MAX_50MHZ = 3;
+const uint32_t	OUTPUT_GPP = 0;
+const uint32_t	OUTPUT_GOD = 1;
+const uint32_t	OUTPUT_APP = 2;
+const uint32_t	OUTPUT_AOD = 3;
+
+void	set_pin(GPIO *gpio, uint32_t pin) { gpio->BSRR |= ((1 << pin) << 16); }
+void	clear_pin(GPIO *gpio, uint32_t pin) { gpio->BSRR |= (1 << pin); }
+void	output_mode(GPIO *gpio, uint32_t pin, uint32_t mode, uint32_t max) {
+	if (pin > 7) {
+		pin = ((pin - 8) * 4);
+		gpio->CRH |= (max << pin);
+		gpio->CRH |= (mode << (pin + 2));
+	}
+	else {
+		pin *= 4;
+		gpio->CRL |= (max << pin);
+		gpio->CRL |= (mode << (pin + 2));
+	}
+}
+
+
+#endif /* __BLUEPILL_H__ */
+