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Copied over 2 new pwm functions from @streamnsight to close #46. these 2 functions are untested, which is why i'm not updating the readme at the moment.

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This commit is contained in:
Robert Wolterman
2017-01-28 04:16:12 +00:00
parent eafcf0bf69
commit 73ae207e16
3 changed files with 171 additions and 1 deletions
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99
source/c_pwm.c
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@ -47,7 +47,6 @@ SOFTWARE.
// Global variables
int pwm_initialized = 0;
//int DEBUG = 0;
// pwm devices (future chip pro use)
struct pwm_dev
@ -173,6 +172,66 @@ int pwm_set_frequency(const char *key, float freq) {
return rtnval;
}
int pwm_set_period_ns(const char *key, unsigned long period_ns) {
int len;
int rtnval = -1;
char buffer[80];
struct pwm_exp *pwm;
//TODO: ADD CHECK FOR period_ns
pwm = lookup_exported_pwm(key);
if (pwm == NULL) {
return rtnval;
}
if (pwm->enable) {
if (period_ns != pwm->period_ns) {
pwm->period_ns = period_ns;
len = snprintf(buffer, sizeof(buffer), "%lu", period_ns); BUF2SMALL(buffer);
ssize_t s = write(pwm->period_fd, buffer, len); //ASSRT(s == len);
if (DEBUG) {
printf(" ** pwm_set_period_ns: pwm_initialized = %d\n", pwm_initialized);
printf(" ** pwm_set_period_ns: buffer: %s\n", buffer);
printf(" ** pwm_set_period_ns: s = %d, len = %d\n", s, len);
}
if (s != len) {
rtnval = -1;
} else {
rtnval = 1;
}
} else {
rtnval = 0;
}
} else {
rtnval = 0;
}
return rtnval;
}
int pwm_get_period_ns(const char *key, unsigned long *period_ns) {
int rtnval = -1;
struct pwm_exp *pwm;
pwm = lookup_exported_pwm(key);
if (pwm == NULL) {
return rtnval;
}
if (DEBUG)
printf(" ** pwm_get_period_ns: %lu **\n",pwm->period_ns);
// Set period_ns to what we have in the struct
*period_ns = pwm->period_ns;
rtnval = 0;
return rtnval;
}
int pwm_set_polarity(const char *key, int polarity) {
int len;
int rtnval = -1;
@ -252,6 +311,44 @@ int pwm_set_duty_cycle(const char *key, float duty) {
return rtnval;
}
int pwm_set_pulse_width_ns(const char *key, unsigned long pulse_width_ns) {
int len;
int rtnval = -1;
char buffer[80];
struct pwm_exp *pwm;
pwm = lookup_exported_pwm(key);
if (pwm == NULL) {
return rtnval;
}
if (pulse_width_ns < 0 || pulse_width_ns > pwm->period_ns)
return rtnval;
pwm->duty = pulse_width_ns / pwm->period_ns;
if (pwm->enable) {
len = snprintf(buffer, sizeof(buffer), "%lu", pwm->duty); BUF2SMALL(buffer);
ssize_t s = write(pwm->duty_fd, buffer, len); //ASSRT(s == len);
if (DEBUG) {
printf(" ** pwm_set_pulse_width_ns: pwm_initialized = %d\n", pwm_initialized);
printf(" ** pwm_set_pulse_width_ns: buffer: %s\n", buffer);
printf(" ** pwm_set_pulse_width_ns: s = %d, len = %d\n", s, len);
}
if (s != len) {
rtnval = -1;
} else {
rtnval = 1;
}
} else {
rtnval = 0;
}
return rtnval;
}
int pwm_set_enable(const char *key, int enable)
{
int len;