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Code Issues Releases Activity

Fixed softpwm bug ("disable" code didn't synchronize thread exit)

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This commit is contained in:
fordsfords
2016-07-09 18:42:38 -05:00
parent 7123c0e308
commit 7812063991
8 changed files with 57 additions and 43 deletions
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58
source/c_softpwm.c
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@ -62,6 +62,7 @@ struct pwm_params
struct softpwm
{
char key[KEYLEN+1]; /* leave room for terminating NUL byte */
int gpio;
struct pwm_params params;
pthread_mutex_t* params_lock;
pthread_t thread;
@ -142,10 +143,10 @@ int softpwm_set_duty_cycle(const char *key, float duty) {;
return 0;
}
void *softpwm_thread_toggle(void *key)
void *softpwm_thread_toggle(void *arg)
{
struct softpwm *pwm;
int gpio;
struct softpwm *pwm = (struct softpwm *)arg;
int gpio = pwm->gpio;
struct timespec tim_on;
struct timespec tim_off;
unsigned int sec;
@ -163,11 +164,8 @@ void *softpwm_thread_toggle(void *key)
bool enabled_local = false;
bool recalculate_timing = false;
get_gpio_number(key, &gpio);
pwm = lookup_exported_pwm((char*)key);
while (!stop_flag_local) {
/* Take a snapshot of the parameter block */
pthread_mutex_lock(pwm->params_lock);
if ((freq_local != pwm->params.freq) || (duty_local != pwm->params.duty)) {
recalculate_timing = true;
@ -178,6 +176,7 @@ void *softpwm_thread_toggle(void *key)
stop_flag_local = pwm->params.stop_flag;
polarity_local = pwm->params.polarity;
pthread_mutex_unlock(pwm->params_lock);
/* If freq or duty has been changed, update the
* sleep times
*/
@ -220,8 +219,8 @@ void *softpwm_thread_toggle(void *key)
}
nanosleep(&tim_off, NULL);
}
}
} /* if enabled_local */
} /* while !stop_flag_local */
if (!polarity_local)
gpio_set_value(gpio, LOW);
@ -240,24 +239,26 @@ int softpwm_start(const char *key, float duty, float freq, int polarity)
int gpio;
int ret;
get_gpio_number(key, &gpio);
gpio_export(gpio);
gpio_set_direction(gpio, OUTPUT);
if (get_gpio_number(key, &gpio) < 0)
return -1;
if (gpio_export(gpio) < 0)
return -1;
if (gpio_set_direction(gpio, OUTPUT) < 0)
return -1;
// add to list
new_pwm = malloc(sizeof(struct softpwm));
if (new_pwm == 0) {
return -1; // out of memory
}
new_pwm = malloc(sizeof(struct softpwm)); ASSRT(new_pwm != NULL);
new_params_lock = (pthread_mutex_t *)malloc(sizeof(pthread_mutex_t));
if (new_pwm == 0) {
return -1; // out of memory
}
pthread_mutex_init(new_params_lock, NULL);
pthread_mutex_lock(new_params_lock);
strncpy(new_pwm->key, key, KEYLEN); /* can leave string unterminated */
new_pwm->key[KEYLEN] = '\0'; /* terminate string */
new_pwm->params.enabled = false;
new_pwm->gpio = gpio;
new_pwm->params.enabled = true;
new_pwm->params.stop_flag = false;
new_pwm->params_lock = new_params_lock;
new_pwm->next = NULL;
@ -274,20 +275,16 @@ int softpwm_start(const char *key, float duty, float freq, int polarity)
pwm->next = new_pwm;
}
softpwm_set_duty_cycle(new_pwm->key, duty);
softpwm_set_frequency(new_pwm->key, freq);
softpwm_set_polarity(new_pwm->key, polarity);
ASSRT(softpwm_set_duty_cycle(new_pwm->key, duty) == 0);
ASSRT(softpwm_set_frequency(new_pwm->key, freq) == 0);
ASSRT(softpwm_set_polarity(new_pwm->key, polarity) == 0);
// create thread for pwm
ret = pthread_create(&new_thread, NULL, softpwm_thread_toggle, (void *)new_pwm->key);
if (ret) {
PySys_WriteStderr("DEBUG; soft_pwm ERROR IN pthread_create\n");
exit(-1);
}
ret = pthread_create(&new_thread, NULL, softpwm_thread_toggle, (void *)new_pwm);
ASSRT(ret == 0);
new_pwm->thread = new_thread;
pthread_mutex_lock(new_params_lock);
new_pwm->params.enabled = true;
pthread_mutex_unlock(new_params_lock);
return 1;
@ -296,7 +293,6 @@ int softpwm_start(const char *key, float duty, float freq, int polarity)
int softpwm_disable(const char *key)
{
struct softpwm *pwm, *temp, *prev_pwm = NULL;
int gpio = 0;
// remove from list
pwm = exported_pwms;
@ -307,9 +303,9 @@ int softpwm_disable(const char *key)
pthread_mutex_lock(pwm->params_lock);
pwm->params.stop_flag = true;
pthread_mutex_unlock(pwm->params_lock);
get_gpio_number(key, &gpio);
gpio_set_value(gpio, LOW);
gpio_unexport(gpio);
pthread_join(pwm->thread, NULL); /* wait for thread to exit */
gpio_unexport(pwm->gpio);
if (prev_pwm == NULL)
{