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Calibrate NOPs for different frame rates

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Phillip Burgess 2021-12-30 11:17:32 -08:00
parent 5efa76f440
commit 3c3fc02a5f
1 changed files with 10 additions and 20 deletions
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30
src/arch/rp2040.h
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@ -236,28 +236,18 @@ uint32_t _PM_timerStop(void *tptr) {
return _PM_timerGetCount(tptr);
}
// TO DO: determine clock-holding NOPs needed for different CPU speeds.
// Rates supported by Philhower core:
// 50, 100, 125, 133, 150, 175, 200, 225, 250, 275, 300
// These probably "bin" somewhat and don't need distinct defines for
// every single one. At slowest speeds, can probably even leave undefined.
// Original NOPs for 125 MHz were 2 for low and 1 for high.
//#if (F_CPU >= something)
//#define _PM_clockHoldLow asm("nop; nop;");
//#define _PM_clockHoldHigh asm("nop;");
//#elif (F_CPU >= something)
//#define _PM_clockHoldLow asm("nop; nop;");
//#define _PM_clockHoldHigh asm("nop;");
//#elif (F_CPU >= something)
//#define _PM_clockHoldLow asm("nop; nop;");
//#define _PM_clockHoldHigh asm("nop;");
//#else
//#define _PM_clockHoldLow asm("nop; nop;");
//#define _PM_clockHoldHigh asm("nop;");
//#endif
#if (F_CPU >= 250000000)
#define _PM_clockHoldLow asm("nop; nop; nop;");
#define _PM_clockHoldHigh asm("nop; nop; nop;");
#elif (F_CPU >= 175000000)
#define _PM_clockHoldLow asm("nop; nop;");
#define _PM_clockHoldHigh asm("nop;");
#elif (F_CPU >= 125000000)
#define _PM_clockHoldLow asm("nop;");
#define _PM_clockHoldHigh asm("nop;");
#elif (F_CPU >= 100000000)
#define _PM_clockHoldLow asm("nop;");
#endif // No NOPs needed at lower speeds
#define _PM_chunkSize 8
#if _PM_CLOCK_PWM