Calypso FB: C123 / ST7558 Black and White Support

1 files changed, 51 insertions, 0 deletions

diff --git a/src/target/firmware/include/fb/fb_bw8.h b/src/target/firmware/include/fb/fb_bw8.h
new file mode 100644
index 00000000..c77fa71f
--- /dev/null
+++ b/src/target/firmware/include/fb/fb_bw8.h
@@ -0,0 +1,51 @@
+#ifndef FB_BW8_H
+#define FB_BW8_H
+
+/* 8bit monochrome framebuffer, organized with 8 stacked pixels
+   per byte, backed by local memory. fb_bw8.c lists functions that
+   are common to simmilar organized displays. */
+
+/*
+	Sketch of Memory Layout 
+	Left Upper Corner of Display
+     
+			col0  col2
+			   col1
+		      +-------------
+	1st row:      | A0 B0 C0
+	2nd row:      | A1 B1 C1
+			...
+	7th row:      | A6 B6 C6
+	8th row:      | A7 B7 C7
+	9th row:      | Q0 R0 S0
+	10th row:     | Q1 R1 S1 ...
+			...
+
+	Backing store (and internal display memory?) looks like...
+	
+	uint8_t mem[] = { A, B, C, .... Q, R, S, ... }
+
+   We work on a in-memory copy of the framebuffer and only
+   update the physical display on demand. The damage window
+   has two corners, left upper inclusive x1,y1 and right
+   lower x2,y2 exclusive. So dirty pixels are defined to
+   be  x1 <= x_pixel < x2 and y1 <= y_pixel < y2.
+*/
+
+/* data specific to a bw8-type framebuffer as described above */
+
+struct fb_bw8 {
+	uint8_t *mem;			/* set to backingstore memory */
+	uint16_t damage_x1,damage_y1;	/* current damage window, ul */
+	uint16_t damage_x2,damage_y2;	/* current damage window, lr */
+};
+
+extern struct fb_bw8 *fb_bw8; /* symbol defined by the specific LCD driver */
+
+extern void fb_bw8_clear();
+extern void fb_bw8_boxto(uint16_t x,uint16_t y); /* draw a box from cursor to x,y */
+extern void fb_bw8_lineto(uint16_t x,uint16_t y); /* draw a line from cursor to x,y */
+
+extern int fb_bw8_putstr(char *str,int maxwidth);
+
+#endif