Macros
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.

#define	PWM_MAX31790_FLAG_SPEED_RANGE_1 (0 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)
	speed range of fan

#define	PWM_MAX31790_FLAG_SPEED_RANGE_2 (1 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

#define	PWM_MAX31790_FLAG_SPEED_RANGE_4 (2 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

#define	PWM_MAX31790_FLAG_SPEED_RANGE_8 (3 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

#define	PWM_MAX31790_FLAG_SPEED_RANGE_16 (4 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

#define	PWM_MAX31790_FLAG_SPEED_RANGE_32 (5 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_0 (0 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)
	PWM rate of change.

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_1 (1 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_2 (2 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_3 (3 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_4 (4 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_5 (5 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_6 (6 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_7 (7 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

#define	PWM_MAX31790_FLAG_SPIN_UP (1 << PWM_MAX31790_FLAG_SPIN_UP_POS)
	activate spin up for fan

Macro Definition Documentation

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_0

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_0 (0 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

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.

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_1

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_1 (1 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_2

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_2 (2 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_3

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_3 (3 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_4

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_4 (4 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_5

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_5 (5 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_6

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_6 (6 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_7

#define PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_7 (7 << PWM_MAX31790_FLAG_PWM_RATE_OF_CHANGE_POS)

◆ PWM_MAX31790_FLAG_RPM_MODE

#define PWM_MAX31790_FLAG_RPM_MODE (1 << PWM_MAX31790_FLAG_RPM_MODE_POS)

RPM mode.

Activating the RPM mode will cause the parameter pulse of pwm_set_cycles to be interpreted as TACH target count. This basically is the number of internal pulses which occur during each TACH period. Hence, a bigger value means a slower rotation of the fan. The details about the TACH target count has to be calculated can be taken from the datasheet of the MAX31790.

◆ PWM_MAX31790_FLAG_SPEED_RANGE_1

#define PWM_MAX31790_FLAG_SPEED_RANGE_1 (0 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

speed range of fan

This represents a multiplicator 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.

◆ PWM_MAX31790_FLAG_SPEED_RANGE_16

#define PWM_MAX31790_FLAG_SPEED_RANGE_16 (4 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

◆ PWM_MAX31790_FLAG_SPEED_RANGE_2

#define PWM_MAX31790_FLAG_SPEED_RANGE_2 (1 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

◆ PWM_MAX31790_FLAG_SPEED_RANGE_32

#define PWM_MAX31790_FLAG_SPEED_RANGE_32 (5 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

◆ PWM_MAX31790_FLAG_SPEED_RANGE_4

#define PWM_MAX31790_FLAG_SPEED_RANGE_4 (2 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

◆ PWM_MAX31790_FLAG_SPEED_RANGE_8

#define PWM_MAX31790_FLAG_SPEED_RANGE_8 (3 << PWM_MAX31790_FLAG_SPEED_RANGE_POS)

◆ PWM_MAX31790_FLAG_SPIN_UP

#define PWM_MAX31790_FLAG_SPIN_UP (1 << PWM_MAX31790_FLAG_SPIN_UP_POS)

activate spin up for fan

This activates the spin up of the fan, which means that the controller will force the fan to maximum speed for a startup from a completely stopped state.

Macros