C++ (Cpp) mraa_pwm_init_internal 예제들

예제 #1

파일: pwm.c 프로젝트: KurtE/mraa

mraa_pwm_context
mraa_pwm_init_raw(int chipin, int pin)
{
    mraa_pwm_context dev = mraa_pwm_init_internal(plat == NULL ? NULL : plat->adv_func , chipin, pin);
    if (dev == NULL) {
        syslog(LOG_CRIT, "pwm: Failed to allocate memory for context");
        return NULL;
    }

    if (IS_FUNC_DEFINED(dev, pwm_init_raw_replace)) {
        if (dev->advance_func->pwm_init_raw_replace(dev, pin) == MRAA_SUCCESS) {
            return dev;
        } else {
            free(dev);
            return NULL;
        }
    }

    char directory[MAX_SIZE];
    snprintf(directory, MAX_SIZE, SYSFS_PWM "/pwmchip%d/pwm%d", dev->chipid, dev->pin);
    struct stat dir;
    if (stat(directory, &dir) == 0 && S_ISDIR(dir.st_mode)) {
        syslog(LOG_NOTICE, "pwm_init: pwm%i already exported, continuing", pin);
        dev->owner = 0; // Not Owner
    } else {
        char buffer[MAX_SIZE];
        snprintf(buffer, MAX_SIZE, "/sys/class/pwm/pwmchip%d/export", dev->chipid);
        int export_f = open(buffer, O_WRONLY);
        if (export_f == -1) {
            syslog(LOG_ERR, "pwm_init: pwm%i. Failed to open export for writing: %s", pin, strerror(errno));
            free(dev);
            return NULL;
        }

        char out[MAX_SIZE];
        int size = snprintf(out, MAX_SIZE, "%d", dev->pin);
        if (write(export_f, out, size * sizeof(char)) == -1) {
            syslog(LOG_WARNING, "pwm_init: pwm%i. Failed to write to export! (%s) Potentially already in use.", pin, strerror(errno));
            close(export_f);
            free(dev);
            return NULL;
        }
        dev->owner = 1;
        mraa_pwm_period_us(dev, plat->pwm_default_period);
        close(export_f);
    }

    mraa_pwm_setup_duty_fp(dev);

    return dev;
}

예제 #2

파일: pwm.c 프로젝트: Sayter99/mraa

mraa_pwm_context
mraa_pwm_init_raw(int chipin, int pin)
{
    mraa_pwm_context dev = mraa_pwm_init_internal(plat == NULL ? NULL : plat->adv_func , chipin, pin);
    if (dev == NULL)
        return NULL;

    char directory[MAX_SIZE];
    snprintf(directory, MAX_SIZE, SYSFS_PWM "/pwmchip%d/pwm%d", dev->chipid, dev->pin);
    struct stat dir;
    if (stat(directory, &dir) == 0 && S_ISDIR(dir.st_mode)) {
        syslog(LOG_NOTICE, "pwm: Pin already exported, continuing");
        dev->owner = 0; // Not Owner
    } else {
        char buffer[MAX_SIZE];
        snprintf(buffer, MAX_SIZE, "/sys/class/pwm/pwmchip%d/export", dev->chipid);
        int export_f = open(buffer, O_WRONLY);
        if (export_f == -1) {
            syslog(LOG_ERR, "pwm: Failed to open export for writing");
            free(dev);
            return NULL;
        }

        char out[MAX_SIZE];
        int size = snprintf(out, MAX_SIZE, "%d", dev->pin);
        if (write(export_f, out, size * sizeof(char)) == -1) {
            syslog(LOG_WARNING, "pwm: Failed to write to export! Potentially already enabled");
            close(export_f);
            free(dev);
            return NULL;
        }
        dev->owner = 1;
        mraa_pwm_period_us(dev, plat->pwm_default_period);
        close(export_f);
    }
    mraa_pwm_setup_duty_fp(dev);
    return dev;
}