Ttelmah
Joined: 11 Mar 2010
Posts: 19467
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 Posted: Tue Jun 28, 2016 3:17 am |
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For the standard PWM, look at the examples. ex_pwm_pcd.c
For the HS PWM, look in the include file for the processor, and download the latest PDF manual (the internal manual has not yet been fully updated - for instance if you start typing 'setup_hspwm', it doesn't link to the main setup function....). However if you select the 'setup_hspwn_unit' function, then the link from the bottom of this page works!.
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////////////////////////////////////////////////////////////////// High-Speed PWM
//
// High-Speed PWM Functions: setup_hspwm(), setup_hspwm_unit(), set_hwpwm_phase(),
// set_hspwm_duty(), set_hspwm_event(), setup_hspwm_blanking(),
// setup_hspwm_trigger(), set_hspwm_override(),
// setup_hspwm_chop_clock(), setup_hspwm_unit_chop_clock(),
// setup_hspwm_secondary(), set_hspwm_event_sedondary(),
// get_hspwm_capture(),
// High-Speed PWM Prototypes:
_bif void setup_hspwm(unsigned int32 settings, unsigned int16 period);
_bif void setup_hspwm_secondary(unsigned int32 settings, unsigned int16 period);
_bif void setup_hspwm_unit(unsigned int8 unit, unsigned int32 settings);
_bif void setup_hspwm_unit(unsigned int8 unit, unsigned int32 settings, unsigned int16 dead_time);
_bif void setup_hspwm_unit(unsigned int8 unit, unsigned int32 settings, unsigned int16 dead_time, unsigned int16 alt_dead_time);
_bif void set_hspwm_phase(unsigned int8 unit, unsigned int16 phase);
_bif void set_hspwm_phase(unsigned int8 unit, unsigned int16 phase, unsigned int16 sphase);
_bif void set_hspwm_duty(unsigned int16 duty);
_bif void set_hspwm_duty(unsigned int8 unit, unsigned int16 duty);
_bif void set_hspwm_duty(unsigned int8 unit, unsigned int16 duty, unsigned int16 sduty);
_bif void set_hspwm_event(unsigned int16 settings, unsigned int16 compare_time);
_bif void set_hspwm_event_secondary(unsigned int16 settings, unsigned int16 compare_time);
_bif void setup_hspwm_blanking(unsigned int8 unit, unsigned int32 settings, unsigned int16 delay);
_bif void setup_hspwm_trigger(unsigned int8 unit);
_bif void setup_hspwm_trigger(unsigned int8 unit, unsigned int8 start_delay);
_bif void setup_hspwm_trigger(unsigned int8 unit, unsigned int8 start_delay, unsigned int8 divider);
_bif void setup_hspwm_trigger(unsigned int8 unit, unsigned int8 start_delay, unsigned int8 divider, unsigned int16 trigger_value);
_bif unsigned int16 get_hspwm_capture(unsigned int8 unit);
_bif void setup_hspwm_chop_clock(unsigned int16 settings);
_bif void setup_hspwm_unit_chop_clock(unsigned int8 unit, unsigned int8 settings);
_bif void set_hspwm_override(unsigned int8 unit, unsigned int16 setting);
// Constants used in SETUP_HSPWM() first parameter are:
// Constants used in SETUP_HSPWM_SECONDARY() first parameter are:
#define HSPWM_DISABLED 0
#define HSPWM_ENABLED 0x8000
#define HSPWM_HALT_IDLE 0x2000
#define HSPWM_UPDATED_IMMEDIATELY 0x0400
#define HSPWM_INVERTED 0x0200
#define HSPWM_SYNCO_ENABLED 0x0100
#define HSPWM_EXT_SYNC 0x0080
// One of the following may be OR'ed in with the above
#define HSPWM_SYNC_SOURCE_SYNCI1 0
#define HSPWM_SYNC_SOURCE_SYNCI2 0x0010
// One of the following may be OR'ed in with the above
#define HSPWM_CLOCK_DIV_BY_1 0
#define HSPWM_CLOCK_DIV_BY_2 0x10000
#define HSPWM_CLOCK_DIV_BY_4 0x20000
#define HSPWM_CLOCK_DIV_BY_8 0x30000
#define HSPWM_CLOCK_DIV_BY_16 0x40000
#define HSPWM_CLOCK_DIV_BY_32 0x50000
#define HSPWM_CLOCK_DIV_BY_64 0x60000
// Constants used in SETUP_HSPWM_UNIT() second parameter are (first parameter is unit number 1,2,...):
#define HSPWM_ENABLE 0xC000
#define HSPWM_ENABLE_H 0x8000
#define HSPWM_ENABLE_L 0x4000
// One of the following may be OR'ed in with the above
#define HSPWM_H_POLARITY_LOW 0x2000
#define HSPWM_H_POLAIRTY_HIGH 0
// One of the following may be OR'ed in with the above
#define HSPWM_L_POLARITY_LOW 0x1000
#define HSPWM_L_POLARITY_HIGH 0
// One of the following may be OR'ed in with the above
#define HSPWM_INDEPENDENT 0x0C00
#define HSPWM_PUSH_PULL 0x0800
#define HSPWM_REDUNDANT 0x0400
#define HSPWM_COMPLEMENTARY 0
// One of the following my be OR'ed in with the above
#define HSPWM_FAULT_L1_H1 0x0030
#define HSPWM_FAULT_L0_H1 0x0020
#define HSPWM_FAULT_L1_H0 0x0010
#define HSPWM_FAULT_L0_H0 0
// One of the following may be OR'ed in with the above
#define HSPWM_CURRENT_LIMIT_L1_H1 0x000C
#define HSPWM_CURRENT_LIMIT_L0_H1 0x0008
#define HSPWM_CURRENT_LIMIT_L1_H0 0x0004
#define HSPWM_CURRENT_LIMIT_L0_H0 0
// The following may be OR'ed in with the above
#define HSPWM_SWAP_H_AND_L 0x0002
#define HSPWM_SYNC_OVERRIDE 0x0001
// The following may be OR'ed in with the above
#define HSPWM_FAULT_INT_ENABLED 0x10000000
#define HSPWM_CURRENT_LIMIT_INT_ENABLED 0x08000000
#define HSPWM_TRIGGER_INT_ENABLED 0x04000000
#define HSPWM_TIME_BASE_FROM_PHASE_REGS 0x02000000
#define HSPWM_DUTY_CYCLE_FROM_MDC_REG 0x01000000
// One of the following may be OR'ed in with the above
#define HSPWM_DT_FUCNTION_DISABLED 0x00800000
#define HSPWM_DT_NEGATIVE 0x00400000
#define HSPWM_DT_POSITIVE 0
// The following may be OR'ed in with the above
#define HSPWM_USES_SECONDARY_TIME_BASE 0x00080000
#define HSPWM_CURRENT_LIMIT_RESETS_TIME_BASE 0x00020000
#define HSPWM_UPDATE_ARE_IMMEDIATE 0x00010000
// One of the following may be OR'ed in with the above
#define HSPWM_CENTER_ALIGN_MODE 0x00040000
#define HSPWM_EDGE_ALIGN_MODE 0
// One of the following may be OR'ed in with the above
#define HSPWM_INDEPENDENT_FAULT_MODE 0x800000000000
#define HSPWM_NORMAL_FAULT_MODE 0
// One of the following may be OR'ed in with the above
#define HSPWM_CURRENT_LIMIT_SOURCE_COMP4 0x400000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_COMP3 0x3C0000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_COMP2 0x380000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_COMP1 0x340000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT12 0x300000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT11 0x2C0000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT10 0x280000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT9 0x240000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT8 0x200000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT7 0x1C0000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT6 0x180000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT5 0x140000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT4 0x100000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT3 0x0C0000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT2 0x080000000000
#define HSPWM_CURRENT_LIMIT_SOURCE_FLT1 0x040000000000
// One of the following may be OR'ed in with the above
#define HSPWM_CURRENT_LIMIT_ACTIVE_LOW 0x020000000000
#define HSPWM_CURRENT_LIMIT_ACTIVE_HIGH 0
// One of the following may be OR'ed in with the above
#define HSPWM_CURRENT_LIMIT_MODE_ENABLED 0x010000000000
#define HSPWM_CURRENT_LIMIT_MODE_DISABLED 0
// One of the following may be OR'ed in with the above
#define HSPWM_FAULT_SOURCE_COMP4 0x008000000000
#define HSPWM_FAULT_SOURCE_COMP3 0x007800000000
#define HSPWM_FAULT_SOURCE_COMP2 0x007000000000
#define HSPWM_FAULT_SOURCE_COMP1 0x006800000000
#define HSPWM_FAULT_SOURCE_FLT12 0x006000000000
#define HSPWM_FAULT_SOURCE_FLT11 0x005800000000
#define HSPWM_FAULT_SOURCE_FLT10 0x005000000000
#define HSPWM_FAULT_SOURCE_FLT9 0x004800000000
#define HSPWM_FAULT_SOURCE_FLT8 0x004000000000
#define HSPWM_FAULT_SOURCE_FLT7 0x003800000000
#define HSPWM_FAULT_SOURCE_FLT6 0x003000000000
#define HSPWM_FAULT_SOURCE_FLT5 0x002800000000
#define HSPWM_FAULT_SOURCE_FLT4 0x002000000000
#define HSPWM_FAULT_SOURCE_FLT3 0x001800000000
#define HSPWM_FAULT_SOURCE_FLT2 0x001000000000
#define HSPWM_FAULT_SOURCE_FLT1 0x000800000000
// One of the following may be OR'ed in with the above
#define HSPWM_FAULT_ACTIVE_LOW 0x000400000000
#define HSPWM_FAULT_ACTIVE_HIGH 0
// One of the following may be OR'ed in with the above
#define HSPWM_FAULT_MODE_DISABLED 0x000300000000
#define HSPWM_FAULT_MODE_ENABLED_CYCLE 0x000100000000
#define HSPWM_FAULT_MODE_ENABLED_LATCHED 0
// Constants used in SETUP_HSPWM_EVENT() first parameter are:
// Constants used in SETUP_HSPWM_EVENT_SECONDARY() first parameter are:
#define HSPWM_SPECIAL_EVENT_INT_ENABLED 0x0800
#define HSPWM_SPECIAL_EVENT_INT_DISABLED 0
// Or (with |) the above with a number 1-16 to set special event postscaler
// Constants used in SETUP_HSPWM_BLANKING() second parameter are (first parameter is unit number 1,2,...):
#define HSPWM_RE_PWMH_TRIGGERS_LE_BLANKING 0x8000
#define HSPWM_FE_PWMH_TRIGGERS_LE_BLANKING 0x4000
#define HSPWM_RE_PWML_TRIGGERS_LE_BLANKING 0x2000
#define HSPWM_FE_PWML_TRIGGERS_LE_BLANKING 0x1000
#define HSPWM_LE_BLANKING_APPLIED_TO_FAULT_INPUT 0x0800
#define HSPWM_LE_BLANKING_APPLIED_TO_CURRENT_LIMIT_INPUT 0x0400
#define HSPWM_STATE_BLANKING_WHEN_BLANKING_SIGNAL_HIGH 0x0020
#define HSPWM_STATE_BLANKING_WHEN_BLANKING_SIGNAL_LOW 0x0010
#define HSPWM_STATE_BLANKING_WHEN_PWMH_HIGH 0x0008
#define HSPWM_STATE_BLANKING_WHEN_PWMH_LOW 0x0004
#define HSPWM_STATE_BLANKING_WHEN_PWML_HIGH 0x0002
#define HSPWM_STATE_BLANKING_WHEN_PWML_LOW 0x0001
// One of the following may be OR'ed in with the above
#define HSPWM_STATE_BLANKING_SOURCE_PWM1H 0x00010000
#define HSPWM_STATE_BLANKING_SOURCE_PWM2H 0x00020000
#define HSPWM_STATE_BLANKING_SOURCE_PWM3H 0x00030000
#define HSPWM_STATE_BLANKING_SOURCE_PWM4H 0x00040000
#define HSPWM_STATE_BLANKING_SOURCE_PWM5H 0x00050000
#define HSPWM_HIGH_RESOLUTION_PWM_PERIOD_DISABLED 0x00800000
#define HSPWM_HIGH_RESOLUTION_PWM_DUTY_DISABLED 0x00400000
// Constants used in SET_HSPWM_OVERRIDE() second parameter are (first parameter is unit number 1,2,...):
#define HSPWM_FORCE_H_1 0x0280
#define HSPWM_FORCE_H_0 0x0200
#define HSPWM_FORCE_L_1 0x0140
#define HSPWM_FORCE_L_0 0x0100
// Constants used in SETUP_HSPWM_CHOP_CLOCK() first parameter are:
#define HSPWM_CHOP_CLK_GENERATOR_ENABLED 0x8000
#define HSPWM_CHOP_CLK_GENERATOR_DISABLED 0
// Or (with |) the above with a number 1-1024 to set the chop clock divider
// Constants used in SETUP_HSPWM_UNIT_CHOP_CLOCK() second parameter are (first parameter is unit number 1,2,...):
#define HSPWM_PWMH_CHOPPING_ENABLED 0x0002
#define HSPWM_PWML_CHOPPING_ENABLED 0x0001
#define HSPWM_CHOPPING_DISABLED 0
// One of the following may be OR'ed in with the above
#define HSPWM_CLOP_CLK_SOURCE_PWM5H 0x0014
#define HSPWM_CLOP_CLK_SOURCE_PWM4H 0x0010
#define HSPWM_CLOP_CLK_SOURCE_PWM3H 0x000C
#define HSPWM_CLOP_CLK_SOURCE_PWM2H 0x0008
#define HSPWM_CLOP_CLK_SOURCE_PWM1H 0x0004
#define HSPWM_CHOP_CLK_SOURCE_CHOP_CLK_GENERATOR 0
// Constants used in SETUP_HSPWM_TRIGGER() second parameter are (first parameter is unit number 1,2,...):
#define HSPWM_COMBINE_PRIMARY_AND_SECONDARY_TRIGGER 0x0080
#define HSPWM_SEPERATE_PRIMARY_AND_SECONDARY_TRIGGER 0
// Or (with |) the above with a number 0-63 to set trigger event start delay
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However 1.04nSec. I'm not sure you will get this at 20KHz. The actual resolution you can get will depend on what divisor is needed from the master clock you are running. 1.04nSec, is a 'best' outcome, running with the fastest auxiliary clock, and /1 divisor.
The syntax for the functions are:
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SETUP_HSPWM(1,HSPWM_ENABLED|HSPWM_SYNC_SOURCE_SYNCI1|HSPWM_CLOCK_DIV_BY_1 );
setup_hspwm_unit(1,HSPWM_ENABLE|HSPWM_H_POLAIRTY_HIGH |HSPWM_L_POLARITY_LOW |HSPWM_COMPLEMENTARY, 100,100);
set_hspwm_duty(1,50);
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