Game and music played too quickly

[jd5000]

I compiled it on latest Platformio v2.3.3 under Ubuntu 20.04, and flashed on DOIT ESP32 DEVKIT V1 (with ESP-WROOM-32 chip), it worked but the game and music played too quickly, for example the 400 seconds timer in Super Mario will finish in about 1 minute. Maybe the original timing is not fully compatible with latest compiler.

[badvision]

The NES timing of the emulator is controller here:

https://github.com/badvision/esp32_nesemu/blob/c2b65885d9924eb36794396f321372cc1031f004/lib/nofrendo/src/nes/nes.c#L46

It looks like the emulator is hardwired to run games at 60hz. If you try a PAL version of a game made for 50hz systems then it might run 20% faster than it should. Can you confirm if your are using an NTSC or a PAL game file?

-Brendan

[jd5000]

I tried a few games, they all running very quickly. I believe they should be NTSC version, because when I run them on MittisBootloop's pre-compiled firmware, speed is normal.

[SpazCode153]

Hi @jd5000 I managed to overcome this issue by defining PAL in nes.h above the ifdef but this I had to do as the ROM was PAL If the ROM is a European ROM its most likely be the PAL version however American ones are NTSC. Try the define in the nes.h file and see if it works.

/* NTSC = 60Hz, PAL = 50Hz / #define PAL #ifdef PAL #define NES_REFRESH_RATE 50 #else / !PAL / #define NES_REFRESH_RATE 60 #endif / !PAL */

for reference this is one of the games I tried and it works at normal speed if you add the define