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Hi,
Accidentally I have executed mass erase command from bsl, hence i lost DCO calibration.
My device is now running around 10 time faster before executing command.
I've searched for DCO data generation code for msp430g2544 on-line, but found nothing.
Is there any doc on how to do DCO calibration?
Appreciating your time.
Regards,
Akash Gajjar
I found this code for your reference.
Your target hardware must include working 32768 Hz crystal.
;*******************************************************************************
; Code for application report - "DCO Library"
;*******************************************************************************
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;*******************************************************************************
; DCO Library
;
; Description; Allows the DCO to be calibrated to a multiple of ACLK
;
;
; Memory Usage: <184 bytes
;
; L. Westlund
; Version 1.0
; Texas Instruments, Inc
; October 2006
; Built with IAR Embedded Workbench Version: 3.40A
;*******************************************************************************
#include <msp430x11x1.h>
MODULE DCO_Library
;Functions
PUBLIC TI_SetDCO
RSEG CODE ; Code is relocatable
EVEN
#ifndef TACCTL2_ ; For Timer_A2 devices
#define TACCTL2 TACCTL0
#define TACCR2 TACCR0
#endif
;-------------------------------------------------------------------------------
TI_SetDCO; Subroutine: Sets DCO to selected frequency based on Delta.
; R14 and R15 are used, ACLK = 32768/8 Timer_A clocked by DCOCLK
; R13 used to hold old BCSCTL1 value
; R12 is the parameter specifying the delta value, MCLK = delta * 4096
; returns in R12:
; 0 - DCO Set Correctly
; 1 - DCO running at slowest setting
; 2 - DCO running at fastest setting
; 0xff - Timeout Occured while setting DCO
;-------------------------------------------------------------------------------
push.w r11 ; save loop counter
push.w r10
push.w &TACTL
push.w &TACCTL2
mov.w #10000, r11 ; max number of times to loop
clr.w r15 ;
mov.b &BCSCTL1, r13 ; Copy BC settings to preserve
#ifndef __MSP430_HAS_BC2__
and.w #0xF8, r13 ; Mask out bits which will change (0-2) 1xx
#else
and.w #0xF0, r13 ; Mask out bits which will change (0-3) 2xx
#endif
SetupBC bis.b #XT2OFF+DIVA_3,&BCSCTL1 ; ACLK=LFXT1CLK/8, XT2OFF to make a known state
SetupCC2 mov.w #CM_1+CCIS_1+CAP,&TACCTL2 ; CAP, ACLK
mov.w #TASSEL_2+MC_2+TACLR, &TACTL; SMCLK, cont-mode, clear
firstTest bit.w #CCIFG,&TACCTL2 ; Test capture flag, skip first short ACLK to avoid error
jz firstTest ;
bic.w #CCIFG,&TACCTL2 ; Clear capture flag
TestDCO dec.w r11
jz ExitTimeOutError ;
TestDCO2 bit.w #CCIFG,&TACCTL2 ; Test capture flag
jz TestDCO2 ;
bic.w #CCIFG,&TACCTL2 ; Clear capture flag
;
AdjDCO mov.w &TACCR2,r14 ; R14 = captured SMCLK
sub.w r15,r14 ; R14 = capture difference
mov.w &TACCR2,r15 ; R15 = captured SMCLK
mov.w r14, r10 ; r10 = capture difference
sub.w r12, r10 ; r10 = difference between desired and actual
jz ExitNoError ; if r12 = r10, DCO set exactly
cmp.w #0xFFFF, r10 ; DCO can be off by 1 for a tolerance
jeq ExitNoError
cmp.w r12, r14 ; Delta = SMCLK/(32768/8)
jlo IncDCO ;
DecDCO dec.b &DCOCTL ; Slow DCO with DCO and MOD
jc TestDCO ; Slower?
#ifndef __MSP430_HAS_BC2__
bit.b #0x7, &BCSCTL1 ; Can RSEL.x be decremented? 1xx
#else
bit.b #0xF, &BCSCTL1 ; Can RSEL.x be decremented? 2xx
#endif
jz ExitSlowestSetting ; jmp>DCO at slowest setting
dec.b &BCSCTL1 ; Decrement RSEL.x
jmp TestDCO ;
IncDCO
#ifndef __MSP430_HAS_BC2__
inc.b &DCOCTL ; Speed DCO with DCO and MOD
jnc TestDCO ; Faster?
cmp.b #XT2OFF+DIVA_3+0x7, &BCSCTL1 ; Can RSEL.x be increased? 1xx
jeq ExitFastestSetting ; jmp> DCO at fastest setting
inc.b &BCSCTL1 ; Increment RSEL.x
jmp TestDCO ;
#else
inc.b &DCOCTL ; Speed DCO with DCO and MOD
jnc TestFor16MHz
cmp.b #XT2OFF+DIVA_3+0xF, &BCSCTL1 ; Can RSEL.x be increased? 2xx
jeq ExitFastestSetting ; jmp> DCO at fastest setting
inc.b &BCSCTL1 ; Increment RSEL.x
jmp TestDCO ;
;-------Compare to built in values
TestFor16MHz
cmp.b &CALDCO_16MHZ, &DCOCTL ; compare current DCO to built in DCO constants
jne TestDCO ; if they are not equal, leave
mov.b &CALBC1_16MHZ, r14 ; move cal values into R14 for manipulation
bis.b #XT2OFF+DIVA_3, r14 ; make sure BCSCTL1 cal has same state
cmp.b r14, &BCSCTL1 ; if they are the same
jeq ExitFastestSetting2xx ; leave all values in place and exit
jmp TestDCO
;-------Compare to built in values
#endif
ExitSlowestSetting
clr.b &DCOCTL
mov.w #0x01, r12
jmp SetDCO_Exit
ExitFastestSetting
mov.b #0xFF, &DCOCTL ; since the DCO previously rolled over
ExitFastestSetting2xx
mov.w #0x02, r12
jmp SetDCO_Exit
ExitTimeOutError
mov.w #0xff, r12
jmp SetDCO_Exit
ExitNoError clr.w r12
SetDCO_Exit clr.w &TACCTL2 ; Stop CCR2
#ifndef __MSP430_HAS_BC2__
bic.b #0xF8, &BCSCTL1 ; Mask out bits which will change (0-2) 1xx
#else
bic.b #0xF0, &BCSCTL1 ; Mask out bits which will change (0-3) 2xx
#endif
bis.b r13, &BCSCTL1 ; copy in old non-DCO BC settings
pop.w &TACTL
pop.w &TACCTL2
pop.w r10
pop.w r11
ret ; Return from subroutine
;
END
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