Hi,
I'm currently using the Real Time Clock on the MSP430F5438A and am having a few problems since updating to the V5.5 version of CCS. Unfortunately, this processor has some errata relating to the RTC which requires assembly functions (supplied by TI, pasted in below) to be used when reading from and writing to the RTC. I have attached the rtcASM.s43 which contains these functions.
With the latest version of CCS I am now getting some compiler warnings, which I cant remove, relating to the above module. Specifically:
Description Resource Path Location Type
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 111 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 73 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 46 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 135 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 161 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 185 C/C++ Problem
[W0005] NOP required after set or rtcASM.s43 /transientMinderV3.0/src line 211 C/C++ Problem
With the exception of these warnings, my project compiles cleanly. As I don't have a detailed understanding of the exact errata issue being resolved by the assembly functions I do not feel confident editing it. I have tried disabling the warnings in the compiler but can't find the correct place to do so (tried --diag_suppress).
Any advice on either suppressing the warning or modifying the code would be gratefully received.
Many thanks
Ben Smither
;******************************************************************************
; MSP430FG5438 - Real Time Clock Workaround
;
; Description: This program demonstrates the RTC Workaround for the RTC
; Errata deailed in the XMS '5438 Errata under RTC3
; Assembly functions for the RTC workaround
; Allows safe access to the RTC registers that potentially have a write issue
; Code is aligned so that the lower 5 bits of the address of the instruction
; fetch following the RTC register write are equal
; Do not change the code in the ASM file (.s43) all nops in there are needed.
;
; Texas Instruments Inc.
; October 2008
; Built with CCE version 3.2.2
;
;*******************************************************************************
; !!!!!! Do not change the code. Every nop has a function !!!!!!
;*******************************************************************************
.cdecls C,LIST,"msp430f5438Syrinix.h" ; Include device header file
;-------------------------------------------------------------------------------
.text ; Progam Start
;-------------------------------------------------------------------------------
.align 32
;-------------------------------------------------------------------------------
.global SetRTCYEAR
; int SetRTCYEAR(int year)
; year will be set in the RTCYEAR register
; return value is read back from the RTCYEAR register
; Works only in calendar mode (RTCMODE = 1)
; argument year is in R12
; return value is in R12
SetRTCYEAR: nop
nop
nop
nop
dint
nop
nop
nop
mov.w R12,&RTCYEAR ; Set RTCYEAR to year
nop
nop
mov.w &RTCYEAR,R12 ; Return value
eint
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCMON
; int SetRTCMON(int month)
; month will be set in the RTCMON register
; Workaround requires to write 16 bits into RTCDATE
; return value is read back from the RTCMON register
; argument month is in R12
; return value is in R12
SetRTCMON: push.w R5 ; push R5
mov.b &RTCDAY,R5 ; read RTCDAY into R5
swpb R12 ; R12 holds month - swap lower and upper byte
bis.w R12,R5 ; combine read RTCDAY and new RTCMON
dint
nop
mov.w R5,&RTCDATE ; write to RTCDATE
nop
nop
nop
nop
eint
mov.b &RTCMON,R12 ; Read RTCMON register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCDAY
; int SetRTCDAY(int day)
; day will be set in the RTCDAY register
; Workaround requires to write 16 bits into RTCDATE
; return value is read back from the RTCDAY register
; argument day is in R12
; return value is in R12
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
SetRTCDAY: ; R12 holds day in lower byte
push.w R5 ; push R5
mov.b &RTCMON,R5 ; read RTCMON into lower byte of R5
swpb R5 ; month is now in higher byte of R5
bic.w #00FFh,R5 ; clear lower byte of R5
bis.w R12,R5 ; combine read RTCDAY and new RTCMON
dint
nop
mov.w R5,&RTCDATE ; write to RTCDATE
nop
eint
mov.b &RTCDAY,R12 ; Read RTCDAY register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCDOW
; int SetRTCDOW(int dow)
; dow will be set in the RTCDOW register
; Workaround requires to write 16 bits into RTCTIM1
; return value is read back from the RTCDOW register
; argument dow is in R12
; return value is in R12
SetRTCDOW: push.w R5 ; push R5
mov.b &RTCHOUR,R5 ; read RTCHOUR into R5
swpb R12 ; R12 holds dow - swap lower and upper byte
bis.w R12, R5 ; combine read RTCHOUR and new RTCDOW
dint
nop
mov.w R5,&RTCTIM1 ; write to RTCTIM1
nop
eint
mov.b &RTCDOW,R12 ; Read RTCDOW register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCHOUR
; int SetRTCHOUR(int hour)
; hour will be set in the RTCHOUR register
; Workaround requires to write 16 bits into RTCTIM1
; return value is read back from the RTCHOUR register
; argument hour is in R12
; return value is in R12
SetRTCHOUR: ; R12 holds day in lower byte
push.w R5 ; push R5
mov.b &RTCDOW,R5 ; read RTCDOW into lower byte of R5
swpb R5 ; dow is now in higher byte of R5
bis.w R12,R5 ; combine read RTCDOW and new RTCHOUR
dint
nop
nop
mov.w R5,&RTCTIM1 ; write to RTCTIM1
nop
eint
mov.b &RTCHOUR,R12 ; Read RTCHOUR register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCMIN
; int SetRTCMIN(int min)
; min will be set in the RTCMIN register
; Workaround requires to write 16 bits into RTCTIM0
; return value is read back from the RTCDOW register
; argument min is in R12
; return value is in R12
SetRTCMIN: push.w R5 ; push R5
mov.b &RTCSEC, R5 ; read RTCSEC into R5
swpb R12 ; R12 holds min - swap lower and upper byte
bis.w R12,R5 ; combine read RTCMIN and new RTCSEC
dint
nop
mov.w R5,&RTCTIM0 ; write to RTCTIM0
nop
eint
mov.b &RTCMIN,R12 ; Read RTCDOW register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global SetRTCSEC
; int SetRTCSEC(int sec)
; sec will be set in the RTCSEC register
; Workaround requires to write 16 bits into RTCTIM0
; return value is read back from the RTCSEC register
; argument sec is in R12
; return value is in R12
SetRTCSEC: ; R12 holds day in lower byte
push.w R5 ; push R5
mov.b &RTCMIN, R5 ; read RTCMIN into lower byte of R5
swpb R5 ; min is now in higher byte of R5
bis.w R12, R5 ; combine read RTCMIN and new RTCSEC
dint
nop
nop
mov.w R5,&RTCTIM0 ; write to RTCTIM0
nop
eint
mov.b &RTCSEC, R12 ; Read RTCSEC register
pop.w R5 ; pop R5
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
;-------------------------------------------------------------------------------
.global GetRTCTIM0
; Read the RTC registers RTCTIM0
; return the values
GetRTCTIM0:
mov.w &RTCTIM0,R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCTIM1
; Read the RTC register RTCTIM1
; return the values
GetRTCTIM1:
mov.w &RTCTIM1,R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCDATE
; Read the RTC register RTCDATE
; return the values
GetRTCDATE:
mov.w &RTCDATE,R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCYEAR
; Read the RTC registers RTCYEAR
; return the values
GetRTCYEAR:
mov.w &RTCYEAR, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCMON
; Read the RTC register RTCMON
; return the values
GetRTCMON:
mov.b &RTCMON, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCDOW
; Read the RTC register RTCDOW
; return the values
GetRTCDOW:
mov.b &RTCDOW, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCDAY
; Read the RTC register RTCDOW
; return the values
GetRTCDAY:
mov.b &RTCDAY, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCHOUR
; Read the RTC register RTCDOW
; return the values
GetRTCHOUR:
mov.b &RTCHOUR, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCMIN
; Read the RTC register RTCDOW
; return the values
GetRTCMIN:
mov.b &RTCMIN, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
.global GetRTCSEC
; Read the RTC register RTCDOW
; return the values
GetRTCSEC:
mov.b &RTCSEC, R12
.if $isdefed("__LARGE_CODE_MODEL__") = 0
ret
.else
reta
.endif
