Zephyr API Documentation 3.7.99
A Scalable Open Source RTOS
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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 | |
#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.
#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_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.
#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.
#define PWM_MAX31790_FLAG_SPEED_RANGE_16 (4 << PWM_MAX31790_FLAG_SPEED_RANGE_POS) |
#define PWM_MAX31790_FLAG_SPEED_RANGE_2 (1 << PWM_MAX31790_FLAG_SPEED_RANGE_POS) |
#define PWM_MAX31790_FLAG_SPEED_RANGE_32 (5 << 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_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.