int rc_tassign(char* pname){
char *ocp;
char *path;
int ret;
int fd;
char buf[80];
//write "am33xx_pwm" to cape manager
rc_slot_add("am33xx_pwm");
//write pin name to cape manager
sprintf(buf, "bone_pwm_%s", pname);
rc_slot_add(buf);
//get path of pwm_test_Px_x
ocp = rc_path("/sys/devices", "ocp.");
sprintf(buf, "pwm_test_%s.", pname);
path = rc_path(ocp, buf);
free(ocp);
//PWM stop
sprintf(buf, "%s/run", path);
fd = open(buf, O_WRONLY);
ret = write(fd, "0", 1);
close(fd);
if(ret <= 0)
return -1;
//set period 26316nS (38kHz)
sprintf(buf, "%s/period", path);
fd = open(buf, O_WRONLY);
write(fd, "26316", 5);
close(fd);
//set duty 10658nS (50%)
sprintf(buf, "%s/duty", path);
fd = open(buf, O_WRONLY);
write(fd, "10658", 5);
close(fd);
//set polarity
sprintf(buf, "%s/polarity", path);
fd = open(buf, O_WRONLY);
write(fd, "0", 1);
close(fd);
free(path);
return 0;
}
int rc_topen(char* pname){
char *ocp;
char *path;
int ret;
int fd;
char buf[80];
//open run
ocp = rc_path("/sys/devices", "ocp.");
sprintf(buf, "pwm_test_%s.", pname);
path = rc_path(ocp, buf);
free(ocp);
sprintf(buf, "%s/run", path);
free(path);
fd = open(buf, O_WRONLY);
return fd;
}
/*
* Function: xy_rc_init
*
* Initializes the configuration.
*/
static CONFIG * xy_rc_init() {
CONFIG *ret = NULL;
char *rcpath = rc_path();
struct stat *st = malloc(sizeof(struct stat));;
if (stat(rcpath, st) != 0) {
write_default_config();
}
log_info(globals->log, READING_CONFIGURATION_MSG);
ret = config_init();
free(st);
free(rcpath);
return ret;
}
int rc_slot_number(const char *dto){
char *path;
FILE *fp;
char buf[80];
int ret = -1;
path = rc_path("/sys/devices", "bone_capemgr.");
sprintf(buf, "%s/slots", path);
free(path);
fp = fopen(buf, "r");
while(fgets(buf, 80, fp) != NULL){
if(strstr(buf, dto) != NULL){
ret = atoi(strtok(buf, ":"));
break;
}
}
fclose(fp);
return ret;
}
int rc_slot_add(const char *dto){
char *path;
int ret;
int fd;
char buf[80];
ret = rc_slot_number(dto);
if(ret >= 0)
return -1;
path = rc_path("/sys/devices", "bone_capemgr.");
sprintf(buf, "%s/slots", path);
free(path);
fd = open(buf, O_WRONLY);
ret = write(fd, dto, strlen(dto));
close(fd);
usleep(500000);
return ret;
}
