Floating point errors with Prism Emulator

Question

Floating point errors with Prism Emulator

Curtis Bennett 0

I am using W11 24H2.

The computer is an M4 chip.

Running parallels as the VM.

I use a specific complier for C called CCS C compiler. It seems the new prism emulator is not handing floating points the same as it used to. It is a 32 bit program. For instance if I declare a float xxx = 1.23; running the program will actually give the output of 0.23

We have had some others in our community verify that prism is the difference.

I have tried all the emulator settings possible in properties. Nothing works.

Curtis Bennett 0

I have included the 2 samples of compiled data.

Compiled code code from M4 , compiled in Production mode. But DEBUG bit set on. MPLAB 6.25

:080000000002040000000000F2
:100400000FF82700F0FF270020A0B7000000000031 
:10041000C1E8A80034152000343A88007400200098
:10042000243A88004827EF0034082C000480880014 
:10043000A4E42300148088000E2EEF001E2EEF008F 
:100440002E2EEF004E2EEF00000000000040FE00B8 
:02000004000AF0 
:10AFE0004FFFFF00FFFFFF003FFFFF00DBFFFF0001
:10AFF000F9FFFF00FFFFFF00FFFFFF00FFFFFF0063
:00000001FF 
;PIC24EP512MC206 ;
CRC=2154 CREATED="05-May-25 08:45"

Compiled code from Intel. Not running Seqouia MPLAB 6.15

:080000000002040000000000F2
:100400000FF82700F0FF270020A0B7000000000031 
:10041000C1E8A80034152000343A88007400200098 
:10042000243A88004827EF000481250004808800D2 
:1004300094F92300148088000E2EEF001E2EEF008A 
:100440002E2EEF004E2EEF00000000000040FE00B8
:02000004000AF0
:10AFE0004FFFFF00FFFFFF003FFFFF00DBFFFF0001 
:10AFF000F9FFFF00FFFFFF00FFFFFF00FFFFFF0063
:00000001FF
;PIC24EP512MC206
;CRC=8CD0 CREATED="05-May-25 08:56"

Your answer

Curtis Bennett 0 Reputation points

2025-05-08T15:13:43.8766667+00:00

I have included the 2 samples of compiled data.

Compiled code code from M4 , compiled in Production mode. But DEBUG bit set on. MPLAB 6.25

:080000000002040000000000F2 :100400000FF82700F0FF270020A0B7000000000031 :10041000C1E8A80034152000343A88007400200098 :10042000243A88004827EF0034082C000480880014 :10043000A4E42300148088000E2EEF001E2EEF008F :100440002E2EEF004E2EEF00000000000040FE00B8 :02000004000AF0 :10AFE0004FFFFF00FFFFFF003FFFFF00DBFFFF0001 :10AFF000F9FFFF00FFFFFF00FFFFFF00FFFFFF0063 :00000001FF ;PIC24EP512MC206 ; CRC=2154 CREATED="05-May-25 08:45"

Compiled code from Intel. Not running Seqouia MPLAB 6.15

:080000000002040000000000F2 :100400000FF82700F0FF270020A0B7000000000031 :10041000C1E8A80034152000343A88007400200098 :10042000243A88004827EF000481250004808800D2 :1004300094F92300148088000E2EEF001E2EEF008A :100440002E2EEF004E2EEF00000000000040FE00B8 :02000004000AF0 :10AFE0004FFFFF00FFFFFF003FFFFF00DBFFFF0001 :10AFF000F9FFFF00FFFFFF00FFFFFF00FFFFFF0063 :00000001FF ;PIC24EP512MC206 ;CRC=8CD0 CREATED="05-May-25 08:56"

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Floating point errors with Prism Emulator

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