Step 2: Add glcd unified graphic display driver. See glcd_drv.c for details.

server/drivers/glcd-low.h

@@ -0,0 +1,54 @@
+/** \file server/drivers/glcd-low.h
+ * Interface to low level code to access graphical displays.
+ *
+ * \note This file should not include hardware dependent header files (libusb,
+ * libftdi, libhid, etc.) Those shall be included by the sub drivers.
+ */
+
+#ifndef GLCD_LOW_H
+#define GLCD_LOW_H
+
+#define GLCD_DEFAULT_SIZE	"128x64"
+#define GLCD_DEFAULT_CELLWIDTH	6
+#define GLCD_DEFAULT_CELLHEIGHT	8
+#define GLCD_MAX_WIDTH		640
+#define GLCD_MAX_HEIGHT		480
+
+#define BYTES_PER_LINE (p->px_width / 8)
+
+/** private data for the \c glcd driver */
+typedef struct glcd_private_data {
+	unsigned char *framebuf;	/**< frame buffer */
+	int px_width;			/**< display width in dots */
+	int px_height;			/**< display height in dots */
+	int cellwidth;			/**< character cell width */
+	int cellheight;			/**< character cell height */
+	int width;			/**< display width in characters */
+	int height;			/**< display height in characters */
+	struct hwDependentFns *glcd_functions;	/**< pointers to low-level functions */
+	void *ct_data;			/**< Connection type specific data */
+} PrivateData;
+
+/** Structure holding pointers to display specific functions */
+typedef struct hwDependentFns {
+	/* report and debug helper. Set by global glcd init */
+	void (*drv_report)(const int level, const char *format,... /* args */ );
+	void (*drv_debug)(const int level, const char *format,... /* args */ );
+
+	/* Transfer the framebuffer to the display */
+	void (*blit)(PrivateData *p);
+
+	/* Switch the backlight on or off */
+	/* void (*set_backlight)(PrivateData *p, char state); */
+
+	/* Set the contrast (value from 0-1000) */
+	/* void (*set_contrast)(PrivateData *p, unsigned int value); */
+
+	/* Output "data" to output latch if there is one */
+	/* void (*output)(PrivateData *p, int data); */
+
+	/* Close the interface on shutdown */
+	void (*close)(PrivateData *p);
+} GLCD_functions;
+
+#endif