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<blockquote data-quote="Ron Kimball" data-source="post: 115309" data-attributes="member: 405">Re: New Midas M32 ConsoleThere&#039;s lots of PD code for those around - most DSP chip makers have them for free. When I was at Intel the next group over was doing stuff like that in ARM assembler, also stuff like an MP3 decoder - I forget what else.Hmm, it was a couple years back I wrote the OS I&#039;m using right now on an ARM M0 (Nuvoton part) , here&#039;s the only &quot;assembler&quot; in it for those interested - the actual task switch code:static __asm void RTOS_Switch(uint32_t **oldsp, uint32_t *newsp){// &quot;C&quot; routines do not expect subroutines to preserve R0-R4, R12// M0 cannot &quot;push&quot; R8+&nbsp; &nbsp; MOV&nbsp; &nbsp; R2, SP&nbsp; &nbsp; SUBS&nbsp; &nbsp; R2, #CONTEXTSIZE*4 &nbsp; &nbsp; STR&nbsp; &nbsp; R2, [R0]&nbsp; &nbsp; MOV&nbsp; &nbsp; R12, R1&nbsp; &nbsp; MOV&nbsp; &nbsp; R0, R8&nbsp; &nbsp; MOV&nbsp; &nbsp; R1, R9&nbsp; &nbsp; MOV&nbsp; &nbsp; R2, R10&nbsp; &nbsp; MOV&nbsp; &nbsp; R3, R11&nbsp; &nbsp; PUSH&nbsp; &nbsp; {R0-R7, LR}&nbsp; &nbsp; &nbsp; MOV&nbsp; &nbsp; SP, R12&nbsp; &nbsp; POP&nbsp; &nbsp; {R0-R7}&nbsp; &nbsp; MOV&nbsp; &nbsp; R8, R0&nbsp; &nbsp; MOV&nbsp; &nbsp; R9, R1&nbsp; &nbsp; MOV&nbsp; &nbsp; R10, R2&nbsp; &nbsp; MOV&nbsp; &nbsp; R11, R3&nbsp; &nbsp; POP&nbsp; &nbsp; {PC}}Easy Peasy :razz:</blockquote>

[QUOTE="Ron Kimball, post: 115309, member: 405"] Re: New Midas M32 Console There's lots of PD code for those around - most DSP chip makers have them for free. When I was at Intel the next group over was doing stuff like that in ARM assembler, also stuff like an MP3 decoder - I forget what else. Hmm, it was a couple years back I wrote the OS I'm using right now on an ARM M0 (Nuvoton part) , here's the only "assembler" in it for those interested - the actual task switch code: static __asm void RTOS_Switch(uint32_t **oldsp, uint32_t *newsp) { // "C" routines do not expect subroutines to preserve R0-R4, R12 // M0 cannot "push" R8+ MOV R2, SP SUBS R2, #CONTEXTSIZE*4 STR R2, [R0] MOV R12, R1 MOV R0, R8 MOV R1, R9 MOV R2, R10 MOV R3, R11 PUSH {R0-R7, LR} MOV SP, R12 POP {R0-R7} MOV R8, R0 MOV R9, R1 MOV R10, R2 MOV R11, R3 POP {PC} } Easy Peasy :razz: [/QUOTE]

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