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drivers: pwm: pwm_nrf5_sw: Fix calculation of cycles per second

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The nRF5x HF timer base frequency is 16 MHz, not 16777216 Hz.

The improved accurracy of the PWM signal was verified with an
oscilloscope on a BBC micro:bit.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>
This commit is contained in:
Henrik Brix Andersen 2018-05-31 14:00:33 +02:00 • committed by Carles Cufí
commit f5310d5b54
1 changed files with 1 additions and 1 deletions
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2
drivers/pwm/pwm_nrf5_sw.c
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@ -208,7 +208,7 @@ static int pwm_nrf5_sw_get_cycles_per_sec(struct device *dev, u32_t pwm,
config = (struct pwm_config *)dev->config->config_info;
/* HF timer frequency is derived from 16MHz source and prescaler is 0 */
*cycles = 16 * 1024 * 1024;
*cycles = 16000000UL;
return 0;
}