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pwm(8): Add percentage value support for duty cycle

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This commit is contained in:
manu 2018-12-14 18:38:10 +00:00
parent 7e40e33031
commit 5088b48b10
2 changed files with 16 additions and 5 deletions
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8
usr.sbin/pwm/pwm.8
View File

@ -67,7 +67,7 @@ Show the configuration of the pwm channel
.It Fl p Ar period
Configure the period (in nanoseconds) of the pwm channel
.It Fl d Ar duty
Configure the duty (in nanoseconds) of the pwm channel
Configure the duty (in nanoseconds or percentage) of the pwm channel
.El
.Sh EXAMPLES
.Bl -bullet
@ -76,9 +76,13 @@ Show the configuration of the pwm channel:
.Pp
pwm -f /dev/pwmc0 -C
.It
Configure a 50000 ns period and a 25000 duty cycles:
Configure a 50000 ns period and a 25000 duty cycle:
.Pp
pwm -f /dev/pwmc0 -p 50000 -d 25000
.It
Configure a 50% duty cycle:
.Pp
pwm -f /dev/pwmc0 -d 50%
.El
.Sh SEE ALSO
.Xr pwm 9 ,

11
usr.sbin/pwm/pwm.c
View File

@ -71,6 +71,7 @@ main(int argc, char *argv[])
int action, ch;
cap_rights_t right_ioctl;
const unsigned long pwm_ioctls[] = {PWMGETSTATE, PWMSETSTATE, PWMMAXCHANNEL};
char *percent;
action = 0;
fd = -1;
@ -104,7 +105,9 @@ main(int argc, char *argv[])
if (action & ~(PWM_PERIOD | PWM_DUTY))
usage();
action = PWM_DUTY;
duty = strtol(optarg, NULL, 10);
duty = strtol(optarg, &percent, 10);
if (*percent != '\0' && *percent != '%')
usage();
break;
case 'c':
if (channel != -1)
@ -199,8 +202,12 @@ main(int argc, char *argv[])
case PWM_DUTY:
if (period != -1)
state.period = period;
if (duty != -1)
if (duty != -1) {
if (*percent != '\0')
state.duty = state.period * duty / 100;
else
state.duty = duty;
}
if (ioctl(fd, PWMSETSTATE, &state) == -1) {
fprintf(stderr,
"Cannot configure the pwm controller\n");