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comparison target-utils/pirexplore/lcd.c @ 76:07b686248ab7

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pirexplore: finally got the backlight to turn on
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Thu, 01 Aug 2013 00:26:29 +0000
parents 8138a6380ae3
children fcbe1332b197
comparison
equal deleted inserted replaced
75:c9768f5fb329 76:07b686248ab7
1 #include <sys/types.h> 1 #include <sys/types.h>
2 #include "types.h" 2 #include "types.h"
3
4 #define GPIO_OUT_REG (*(volatile u16 *)0xFFFE4802)
5 #define nCS4_ADDR0 (*(volatile u16 *)0x02800000)
6 #define nCS4_ADDR2 (*(volatile u16 *)0x02800002)
7
8 fb_spca_write(addr, data)
9 {
10 GPIO_OUT_REG &= 0xFF7F;
11 nCS4_ADDR0 = addr;
12 nCS4_ADDR2 = data;
13 }
3 14
4 void 15 void
5 cmd_spca(argbulk) 16 cmd_spca(argbulk)
6 char *argbulk; 17 char *argbulk;
7 { 18 {
16 } 27 }
17 if (parse_hexarg(argv[1], 4, &data) < 0) { 28 if (parse_hexarg(argv[1], 4, &data) < 0) {
18 printf("ERROR: arg2 must be a valid 16-bit hex value\n"); 29 printf("ERROR: arg2 must be a valid 16-bit hex value\n");
19 return; 30 return;
20 } 31 }
21 *(volatile u16 *)0x02800000 = addr; 32 fb_spca_write(addr, data);
22 *(volatile u16 *)0x02800002 = data;
23 } 33 }
34
35 void
36 cmd_spcainit()
37 {
38 /*
39 * Apparently we have to give it a reset pulse, then immediately
40 * do the black magic register write sequence.
41 */
42 GPIO_OUT_REG = 0x0000;
43 GPIO_OUT_REG = 0x0012;
44 /* non-understandable voodoo copied from OsmocomBB */
45 fb_spca_write(0x7e, 0x00); /* internal register access */
46 osmo_delay_ms(10);
47 fb_spca_write(0x7a, 0x00); /* keep CPU in reset state */
48 osmo_delay_ms(10);
49 fb_spca_write(0x7f, 0x00); /* select main page */
50 osmo_delay_ms(5);
51 fb_spca_write(0x72, 0x07); /* don't reshape timing, 16 bit mode */
52 fb_spca_write(0x14, 0x03);
53 fb_spca_write(0x7f, 0x00); /* select main page */
54 osmo_delay_ms(5);
55 fb_spca_write(0x06, 0xff);
56 fb_spca_write(0x7f, 0x09);
57 fb_spca_write(0x19, 0x08); /* backlight: 0x08 is on, 0x0c is off */
58 fb_spca_write(0x23, 0x18);
59 }