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pwm: add period limits, warn over syslog

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Added minimum, maximum and default period settings to board definitions
PWM will now have a default period as defined in the board defintion.
When using pwm_write() writing 1.0f or above will default to 100%.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-10-30 12:03:24 +00:00
parent 29b0425c9b
commit 3b01af1da1
6 changed files with 28 additions and 0 deletions
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9
src/pwm/pwm.c
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@@ -201,6 +201,7 @@ mraa_pwm_init_raw(int chipin, int pin)
return NULL;
}
dev->owner = 1;
mraa_pwm_period_us(dev, plat->pwm_default_period);
close(export_f);
}
mraa_pwm_setup_duty_fp(dev);
@@ -210,6 +211,9 @@ mraa_pwm_init_raw(int chipin, int pin)
mraa_result_t
mraa_pwm_write(mraa_pwm_context dev, float percentage)
{
if (percentage >= 1.0f) {
return mraa_pwm_write_duty(dev, mraa_pwm_read_period(dev));
}
return mraa_pwm_write_duty(dev, percentage * mraa_pwm_read_period(dev));
}
@@ -235,6 +239,11 @@ mraa_pwm_period_ms(mraa_pwm_context dev, int ms)
mraa_result_t
mraa_pwm_period_us(mraa_pwm_context dev, int us)
{
if (us < plat->pwm_min_period ||
us > plat->pwm_max_period) {
syslog(LOG_ERR, "pwm: period value outside platform range");
return MRAA_ERROR_INVALID_PARAMETER;
}
return mraa_pwm_write_period(dev, us*1000);
}