Zephyr API Documentation 3.7.99
A Scalable Open Source RTOS
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max31790.h File Reference

Go to the source code of this file.

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.