/*
* Test of lcddma device driver
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/* Get a test bitmap */
//#include "penguin.h"
#include "peng_small.h"
/* Define LCD screen parameters */
// Pixels per word
#define SCREEN_X 240
#define LCD_XDIM (SCREEN_X/4)
// Number of lines in a screen
#define LCD_YDIM 64
#define LCD_HFP LCD_XDIM
#define LCD_HSYNC ((LCD_XDIM+1))
#define LCD_HBP ((LCD_XDIM+2))
#define LCD_HTOT ((LCD_XDIM+3))
/* Define LCD connections */
/* LCD data */
#define LCD_DATA_MASK (0xF0)
/* LCD Frame Line Marker or "vertical sync" */
#define LCD_FLM (0x08)
/* LCD AC drive - if vsync is 60Hz, this is 30Hz */
#define LCD_M (0x04)
/* LCD Latch Pulse or "horizontal sync" */
#define LCD_LP (0x02)
/* LCD Clock Pulse or "dot clock" */
#define LCD_CP (0x01)
static unsigned char test_bits[16] = { 0x12, 0x34, 0x56, 0x78,
0x9a, 0xbc, 0xde, 0xf0,
0xde, 0xaf, 0xda, 0xbe,
0xab, 0xbe, 0xca, 0xfe};
int mkbitmap(unsigned short *lcd_array, int do_M) {
int i, j, k;
int peng_x, peng_y;
unsigned short lcd_data;
unsigned char bitmap_data;
for (j = 0; j < LCD_YDIM; j++) {
for (i = 0; i < LCD_HTOT; i++) {
/* Get bitmap data, if we're inside it */
/* Only get four bits, since that's how many we disp per word sent */
if ((i < peng_small_width/4) && (j < peng_small_height))
bitmap_data = ((peng_small_bits[(j * peng_small_width/8) + (i/2)])
<< (4*(1 -(i & 1)))) & LCD_DATA_MASK;
else
bitmap_data = 0x0;
lcd_data = (unsigned short)bitmap_data;
/* Do a hsync */
lcd_data |= (i == LCD_HSYNC) ? LCD_LP : 0 ;
/* Do a vsync */
/* Vsync must have setup/hold time wrt hsync falling edge */
if (j == 0) {
lcd_data |= LCD_FLM;
/* M must change concident with Hsync falling edge */
if (i > LCD_HSYNC)
lcd_data |= do_M ? 0 : LCD_M;
else
lcd_data |= do_M ? LCD_M : 0;
}
else {
lcd_data |= do_M ? LCD_M : 0;
}
/* Do a clock */
/* Data is setup to falling edge */
if (i < LCD_XDIM) {
lcd_array[(j * LCD_HTOT + i) * 2] = lcd_data | LCD_CP;
lcd_array[(j * LCD_HTOT + i) * 2 + 1] = lcd_data;
}
else {
lcd_array[(j * LCD_HTOT + i) * 2] = lcd_data;
lcd_array[(j * LCD_HTOT + i) * 2 + 1] = lcd_data;
}
}
}
}
int main() {
int i, fd;
char dummy;
unsigned char buf[5];
unsigned char readbuf[5];
unsigned int value;
unsigned short *lcdbuf;
printf ("opening lcddma...");
fd = open("/dev/lcddma",O_RDWR,0);
printf ("returned: %d\n", fd);
if (fd < 0) return(fd);
printf("reading from lcddma...");
read(fd, (unsigned char *)(&value), 4);
printf("\nreturned: %x\n", value);
printf("Changing buffer contents\n");
lcdbuf = (unsigned short *)value;
mkbitmap(lcdbuf, 0);
mkbitmap(lcdbuf + (LCD_YDIM) * (LCD_HTOT) * 2, 1);
printf("Addr: %08x\n", lcdbuf);
printf("data: %02x %02x %02x %02x\n",
lcdbuf[0], lcdbuf[1], lcdbuf[2], lcdbuf[3]);
// 2 bytes/word * 2 words/clk * 2 screens/mclk
value = ((LCD_YDIM) * (LCD_HTOT)) * 2 * 2 * 2;
printf("writing new xfer len: %d\n", value);
write(fd, (unsigned char *)(&value), 4);
dummy = getchar();
printf("\nclosing device\n");
}
