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linux: Disable hardware pwm when it is set to zero

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Only write "1" to the "enable" file when a non-zero pwm width is
requested.  Write "0" to the "enable" file when a zero pwm width is
requested.

This fixes a problem on the replicape servo lines that prevented them
from being fully disabled.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2020-07-19 23:59:44 -04:00
parent bc488c2161
commit 5f2cb5436c
2 changed files with 12 additions and 13 deletions
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2
src/linux/gpio.h
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@@ -37,7 +37,7 @@ void spi_transfer(struct spi_config config, uint8_t receive_data
, uint8_t len, uint8_t *data);
struct gpio_pwm {
int fd;
int duty_fd, enable_fd;
uint32_t period;
};
struct gpio_pwm gpio_pwm_setup(uint32_t pin, uint32_t cycle_time, uint16_t val);