Created
September 9, 2012 01:08
-
-
Save stianeikeland/3681791 to your computer and use it in GitHub Desktop.
Pioneer SR-link control - Raspberry PI
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <stdio.h> | |
#include <stdlib.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <sys/mman.h> | |
#include <errno.h> | |
#include <stdint.h> | |
// SR Control pulses (IR pulses without modulation) | |
#define HDR_MARK 9000 | |
#define HDR_PAUSE 4500 | |
#define BIT_MARK 560 | |
#define ONE_PAUSE 1600 | |
#define ZERO_PAUSE 560 | |
// SR Control codes: | |
#define SR_VOLUME_UP 0xA55A50AF | |
#define SR_VOLUME_DOWN 0xA55AD02F | |
#define SR_TOGGLE_PWR 0xA55A38C7 | |
#define SR_INPUT_HDMI 0xA55A7A85 | |
static volatile uint32_t *gpio; | |
void sendCode(unsigned long data, int nbits); | |
void sendPulse(long microsecs); | |
int main(int argc, char **argv) | |
{ | |
int fd, i; | |
// Open memory handle | |
if ((fd = open ("/dev/mem", O_RDWR | O_SYNC) ) < 0) { | |
printf("Unable to open /dev/mem: %s\n", strerror(errno)); | |
return -1; | |
} | |
// map memory to gpio at offset 0x20200000 (gpio start..) | |
gpio = (uint32_t *)mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0x20200000); | |
if ((int32_t)gpio < 0){ | |
printf("Mmap failed: %s\n", strerror(errno)); | |
return -1; | |
} | |
//set gpio17 as an output | |
*(gpio + 1) = (*(gpio + 1) & ~(7 << 21)) | (1 << 21); | |
//set gpio17 high: | |
*(gpio + 7) = 1 << 17; | |
sleep(1); | |
for (i = 0; i < 5; i++) { | |
sendCode(SR_VOLUME_UP, 32); | |
sleep(1); | |
sendCode(SR_VOLUME_DOWN, 32); | |
sleep(1); | |
} | |
} | |
void sendPulse(long microsecs) | |
{ | |
// Take GPIO 17 low, wait, then high. (one pulse..) | |
*(gpio + 10) = 1 << 17; | |
usleep(microsecs); | |
*(gpio + 7) = 1 << 17; | |
} | |
void sendCode(unsigned long data, int nbits) | |
{ | |
int i; | |
sendPulse(HDR_MARK); | |
usleep(HDR_PAUSE); | |
for (i = 0; i < nbits; i++) | |
{ | |
sendPulse(BIT_MARK); | |
if (data & 0x80000000) | |
usleep(ONE_PAUSE); | |
else | |
usleep(ZERO_PAUSE); | |
data <<= 1; | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
SR link appears to have a common header: A5 5A
then a one byte command and a one byte checksum. Command and checksum add to hex FF (255)
I wonder if those commands are publshed by Pioneer?