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MESC TOOL NEWS:
MESCT-MR30-000616D
Please take note of the following problem in using real-time OS MR30 for the M16C/60 and M16C/20 series of microcomputers:
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Versions Concerned
| MR30 V.2.00 Release 1 -- MR30 V.3.20 Release 1 |
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Problem
Issuing the prcv_msg system call does not allow the value of register R3 to be maintained.
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Conditions
This problem occurs if the following two conditions are satisfied:
(1) A prcv_msg system call is issued from a source file described in assembly language. Note that this problem does not occur if this system call is issued from a source file described in C language.
(2) The message is 32 bits in length.
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Workaround
Add an instruction for saving register R3 to the macro definition of the prcv_msg system call contained in the mr30.inc file. This file will be found in the lib30 subdirectory under the directory where MR30 has been installed.
[Macro Definition of prcv_msg System Call]
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prcv_msg .MACRO MBXID
.ASSERT 'prcv_msg' >> ..file@mrc
MOV.B MBXID,A0
MOV.W #TFN_PRCV_MSG,R0
.if FAR_MSG_MODEL
PUSH.W R3 <--- Added
INT #39
POP.W R3 <--- Added
.else
INT #33
.endif
.ENDM
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Schedule of Fixing Problem
We plan to fix this problem in our next release.
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