pwm.s

来自「pxa255,bootloaer ,从初始化中断到GPIO口」· S 代码 · 共 95 行

;**********************************************
;**************Pulse Width Modulator***********
;**********************************************
PWM_CTRL0			EQU		0x40b00000		;//PWM Control Registers 0
PRESCALE00			EQU		(0x0<<0)
PRESCALE01			EQU		(0x0<<1)		;PWMn Prescale Divisor.
PRESCALE02			EQU		(0x0<<2)		;Determines the frequency of the PWM module clock (in terms of the 3.86 MHz clock)
PRESCALE03			EQU		(0x0<<3)		;PSCLK_PWMn = 3.6864 MHz / (PWM_CTRL[PRESCALE] + 1)
PRESCALE04			EQU		(0x0<<4)
PRESCALE05			EQU		(0x0<<5)
PWM_SD0				EQU		(0x0<<6)		;if pwm_sd=0x0 Graceful shutdown. if pwm_sd=0x1 Abrupt shutdown

PWM_CTRL0_Value	    EQU		(PRESCALE00|PRESCALE01|PRESCALE02|PRESCALE03|PRESCALE04|PRESCALE05|PWM_SD0)


PWM_DUTY0		    EQU		0x40b00004		;//PWM Duty Cycle Registers0
DCYCLE00			EQU		(0x0<<0)
DCYCLE01			EQU		(0x0<<1)		;
DCYCLE02			EQU		(0x0<<2)
DCYCLE03			EQU		(0x0<<3)
DCYCLE04			EQU		(0x0<<4)
DCYCLE05			EQU		(0x0<<5)
DCYCLE06			EQU		(0x0<<6)
DCYCLE07			EQU		(0x0<<7)
DCYCLE08			EQU		(0x0<<8)
DCYCLE09			EQU		(0x0<<9)
FDCYCLE0		    EQU		(0x0<<10)		;fdcycle=0 PWM clock (PWM_OUTn) duty cycle is determined by DCYCLE field.fdcycle=1 PWM_OUTn is set high and does not toggle.

PWM_DUTY0_Value	    EQU		(DCYCLE00|DCYCLE01|DCYCLE02|DCYCLE03|DCYCLE04|DCYCLE05|DCYCLE06|DCYCLE07|DCYCLE08|DCYCLE09|FDCYCLE0)


PWM_PERVAL0		    EQU		0x40b00008		;//PWM Period Control Register0
PV00				EQU		(0x0<<0)
PV01				EQU		(0x0<<1)
PV02				EQU		(0x0<<2)
PV03				EQU		(0x0<<3)
PV04				EQU		(0x0<<4)
PV05				EQU		(0x0<<5)
PV06				EQU		(0x0<<6)
PV07				EQU		(0x0<<7)
PV08				EQU		(0x0<<8)
PV09				EQU		(0x0<<9)
PWM_PERVAL0_Value   EQU		(PV00|PV01|PV02|PV03|PV04|PV05|PV06|PV07|PV08|PV09)




PWM_CTRL1			EQU		0x40c00000		;//PWM Control Registers 1
PRESCALE10			EQU		(0x0<<0)
PRESCALE11			EQU		(0x0<<1)		;PWMn Prescale Divisor.
PRESCALE12			EQU		(0x0<<2)		;Determines the frequency of the PWM module clock (in terms of the 3.86 MHz clock)
PRESCALE13			EQU		(0x0<<3)		;PSCLK_PWMn = 3.6864 MHz / (PWM_CTRL[PRESCALE] + 1)
PRESCALE14			EQU		(0x0<<4)
PRESCALE15			EQU		(0x0<<5)
PWM_SD1				EQU		(0x0<<6)		;if pwm_sd=0x0 Graceful shutdown. if pwm_sd=0x1 Abrupt shutdown

PWM_CTRL1_Value		EQU		(PRESCALE10|PRESCALE11|PRESCALE12|PRESCALE13|PRESCALE14|PRESCALE15|PWM_SD1)


PWM_DUTY1			EQU		0x40c00004		;//PWM Duty Cycle Registers 1
DCYCLE10			EQU		(0x0<<0)
DCYCLE11			EQU		(0x0<<1)		;
DCYCLE12			EQU		(0x0<<2)
DCYCLE13			EQU		(0x0<<3)
DCYCLE14			EQU		(0x0<<4)
DCYCLE15			EQU		(0x0<<5)
DCYCLE16			EQU		(0x0<<6)
DCYCLE17			EQU		(0x0<<7)
DCYCLE18			EQU		(0x0<<8)
DCYCLE19			EQU		(0x0<<9)
FDCYCLE1			EQU		(0x0<<10)		;fdcycle=0 PWM clock (PWM_OUTn) duty cycle is determined by DCYCLE field.fdcycle=1 PWM_OUTn is set high and does not toggle.

PWM_DUTY1_Value		EQU		(DCYCLE10|DCYCLE11|DCYCLE12|DCYCLE13|DCYCLE14|DCYCLE15|DCYCLE16|DCYCLE17|DCYCLE18|DCYCLE19|FDCYCLE1)


PWM_PERVAL1			EQU		0x40c00008		;//PWM Period Control Register 1
PV10				EQU		(0x0<<0)
PV11				EQU		(0x0<<1)
PV12				EQU		(0x0<<2)
PV13				EQU		(0x0<<3)
PV14				EQU		(0x0<<4)
PV15				EQU		(0x0<<5)
PV16				EQU		(0x0<<6)
PV17				EQU		(0x0<<7)
PV18				EQU		(0x0<<8)
PV19				EQU		(0x0<<9)
PWM_PERVAL1_Value	EQU		(PV10|PV11|PV12|PV13|PV14|PV15|PV16|PV17|PV18|PV19)


	
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