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[libcpu][C28x] Fix bugs of old c28x interrupt api which can not save and restore int status 

In C28x DSP, interrupt status are stored in ST1 register. Both INTM and DBGM is used for masking interrupt, while the latter one is used in real-time debug mode. The origin function rudely enable and disable the interrupt without considering the recent interrupt status, which not only may cause  problem in some situation but also is not in conformity with rt-thread design specifications. The new api will fix this bug.
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明德无敌赵晓薇 2019-06-18 20:59:00 +08:00 committed by GitHub
parent b6207a2008
commit 21d32cdb3a
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1 changed files with 5 additions and 2 deletions
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7
libcpu/ti-dsp/c28x/context.s
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@ -73,7 +73,9 @@ RT_CTX_RESTORE .macro
; ;
.asmfunc .asmfunc
_rt_hw_interrupt_disable: _rt_hw_interrupt_disable:
DINT PUSH ST1
SETC INTM,DBGM
MOV AL, *--SP
LRETR LRETR
.endasmfunc .endasmfunc
@ -82,7 +84,8 @@ _rt_hw_interrupt_disable:
; ;
.asmfunc .asmfunc
_rt_hw_interrupt_enable: _rt_hw_interrupt_enable:
EINT MOV *SP++, AL
POP ST1
LRETR LRETR
.endasmfunc .endasmfunc