max31790.h File Reference

Header file for MAX31790 PWM driver. More...

Go to the source code of this file.

Macros
#define	PWM_MAX31790_FLAG_SPIN_UP   (1 << PWM_MAX31790_FLAG_SPIN_UP_POS)
	Activate spin up for fan.
Custom PWM flags for MAX31790
These flags can be used with the PWM API in the upper 8 bits of pwm_flags_t They allow the usage of the RPM mode, which will cause the MAX31790 to measure the actual speed of the fan and automatically control it to the desired speed.
#define	PWM_MAX31790_FLAG_RPM_MODE   (1 << PWM_MAX31790_FLAG_RPM_MODE_POS)
	RPM mode.
Speed range of fan
This represents a multiplier for the TACH count and should be chosen depending on the nominal RPM of the fan. A detailed table on how to choose a proper value can be found in the datasheet of the MAX31790.
#define	PWM_MAX31790_FLAG_SPEED_RANGE_1   (0 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	1 TACH period (best for low-speed fans).
#define	PWM_MAX31790_FLAG_SPEED_RANGE_2   (1 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	2 TACH periods
#define	PWM_MAX31790_FLAG_SPEED_RANGE_4   (2 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	4 TACH periods
#define	PWM_MAX31790_FLAG_SPEED_RANGE_8   (3 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	8 TACH periods
#define	PWM_MAX31790_FLAG_SPEED_RANGE_16   (4 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	16 TACH periods
#define	PWM_MAX31790_FLAG_SPEED_RANGE_32   (5 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	32 TACH periods (best for high-speed fans).
PWM rate of change
Configures the internal control loop of the fan. Details about these values can be found in the datasheet of the MAX31790.
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_0   (0 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Fastest rate of change (0ms per step in PWM mode).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_1   (1 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Fast rate of change (1.953125 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_2   (2 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Medium-fast rate of change (3.90625 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_3   (3 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Medium rate of change (7.8125 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_4   (4 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Medium-slow rate of change (15.625 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_5   (5 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Slow rate of change (31.25 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_6   (6 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Very slow rate of change (62.5 ms per step).
#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_7   (7 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	Ultra-slow rate of change (125 ms per step).

Detailed Description

Header file for MAX31790 PWM driver.