initial commit

Signed-off-by: Your Name <you@example.com>

rpi.h

@@ -0,0 +1,48 @@
+#ifndef RPI_H_
+#define RPI_H_
+
+/* gpio modes. */
+#define PI_INPUT  0
+#define PI_OUTPUT 1
+#define PI_ALT0   4
+#define PI_ALT1   5
+#define PI_ALT2   6
+#define PI_ALT3   7
+#define PI_ALT4   3
+#define PI_ALT5   2
+
+void gpioSetMode(unsigned gpio, unsigned mode);
+int gpioGetMode(unsigned gpio);
+
+/* Values for pull-ups/downs off, pull-down and pull-up. */
+#define PI_PUD_OFF  0
+#define PI_PUD_DOWN 1
+#define PI_PUD_UP   2
+void gpioSetPullUpDown(unsigned gpio, unsigned pud);
+
+int gpioRead(unsigned gpio);
+void gpioWrite(unsigned gpio, unsigned level);
+void gpioTrigger(unsigned gpio, unsigned pulseLen, unsigned level);
+
+/* Bit (1<<x) will be set if gpio x is high. */
+uint32_t gpioReadBank1(void);
+uint32_t gpioReadBank2(void);
+
+/* To clear gpio x bit or in (1<<x). */
+void gpioClearBank1(uint32_t bits);
+void gpioClearBank2(uint32_t bits);
+
+/* To set gpio x bit or in (1<<x). */
+void gpioSetBank1(uint32_t bits);
+void gpioSetBank2(uint32_t bits);
+
+unsigned gpioHardwareRevision(void);
+
+/* Returns the number of microseconds after system boot. Wraps around
+   after 1 hour 11 minutes 35 seconds.
+*/
+uint32_t gpioTick(void);
+
+int gpioInitialise(void);
+
+#endif /* RPI_H_ */