flexspin compiler for P2: Assembly, Spin, BASIC, and C in one compiler

JonnyMac

Version 7.3.0 doesn't understand a PNut constant (this works in Propeller Tool and Spin Tools).

ersmith

@JonnyMac said:
Version 7.3.0 doesn't understand a PNut constant (this works in Propeller Tool and Spin Tools).

Thanks for catching this Jon. Chip added p_invert_out as an alias for p_invert_output, but I didn't notice that change (the table in flexspin was created based on an older version of the docs, I guess). I've added that and p_true_out to github and they'll be in the next release.

Rayman

@ersmith The "shell.c" example doesn't seem to compile in FlexProp IDE...

ersmith

@Rayman said:
@ersmith The "shell.c" example doesn't seem to compile in FlexProp IDE...

In which version of FlexProp, and on which OS? It works for me with 7.4.2 on Linux. I seem to recall that there was a bug in shell.c in an earlier version (7.4.0 perhaps?)

Rayman

Thanks @ersmith Guess just having a hard time keeping up to date... Think that was 7.3...

__deets__

I'm trying to the this driver working: https://github.com/libdriver/sx1268

It makes use of a variadic function for debug prints. See

typedef struct sx1268_handle_s
{
...
    void (*debug_print)(const char *const fmt, ...);                      /**< point to a debug_print function address */
}

When trying to compile with flexcc, I get

/tmp/test.c:33: error: Bad number of parameters in call to debug_print: expected 2 found 1

if the function is called without any argument beyond the format part for a simple print-statement without any actual string interpolation.

GCC eats this just fine.

I'm on the latest and greatest release I'd say:

Propeller Spin/PASM Compiler 'FlexSpin' (c) 2011-2025 Total Spectrum Software Inc. and contributors
Version 7.4.2-HEAD-v7.4.2 Compiled on: Aug 31 2025

Any suggestions welcome.

Edit: I just saw that there's no actual string interpolation used, so for some immediate progress I just redefined the debug function to be non-variadic. I still think this is a bug (and would prefer to use the driver unaltered of obvious reasons).

ersmith

@deets thanks for the bug report. It is fixed in github in version 7.4.4.

Sapphire

Hi Eric,

I was playing with flexspin and think I found a problem with the P1 converter.

This spin code:

        if phsa > 15
          adjust := -(phsa >> 2)      ' /4
        elseif phsb > 15
          adjust := +(phsb >> 2)      ' /4

Produced this pasm code:

        cmps phsa, #16 wc
 if_b   jmp #LR__0002
        mov arg04, phsa
        shr arg04, #2
        neg _var05, arg04
        jmp #LR__0003
LR__0002
        cmps phsb, #16 wc
 if_ae  mov _var05, phsb
 if_ae  shr _var05, #2
LR__0003

But the cmps phsx, #16 wc isn't right because phsx used in the destination field gets the shadow register value, not the count.

Changing to this works:

    mov   temp, phsa
    cmps  temp, #16 wc

I though you might want to know about this.

Interestingly, this spin code:

        long[pa] := phsa
        long[pb] := phsb

Produced this pasm code:

    mov     arg04, phsa
    wrlong  arg04, arg07
    mov     arg04, phsb
    wrlong  arg04, arg08

Which is expected and correct.