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| author | Nebuleon Fumika | 2013-02-06 00:43:21 -0500 |
|---|---|---|
| committer | Nebuleon Fumika | 2013-02-06 00:43:21 -0500 |
| commit | 8c5f5ba1823ac57f78ef6bec72fca93c45d0d2fa (patch) | |
| tree | 1f16a96b3580b05e242196353d7c4785dc537770 /source | |
| parent | 9e87a7a2b2659785bc05266fbb3292b60aecdf27 (diff) | |
| download | snes9x2005-8c5f5ba1823ac57f78ef6bec72fca93c45d0d2fa.tar.gz snes9x2005-8c5f5ba1823ac57f78ef6bec72fca93c45d0d2fa.tar.bz2 snes9x2005-8c5f5ba1823ac57f78ef6bec72fca93c45d0d2fa.zip | |
Document the auto CPU behavior a bit.
Diffstat (limited to 'source')
| -rw-r--r-- | source/nds/entry.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp index 08e95cb..5cca41e 100644 --- a/source/nds/entry.cpp +++ b/source/nds/entry.cpp @@ -642,6 +642,18 @@ static unsigned int sync_next = 0; static unsigned int skip_rate= 0; +/* + * Automatic CPU frequency support is here. + * Whenever, after one downclock determination interval, each frame rendered + * during it has been rendered at least as early as CPU_DOWNCLOCK_EARLY_TIME, + * lower the CPU frequency in response. + * If at least one frame has been early, but not early enough, the CPU + * frequency stays stable. + * If at least one frame has been late, the CPU will have be switched back + * to 396 MHz. + * This improves battery life to a certain extent. + */ + #define CPU_DOWNCLOCK_EARLY_TIME 293 /* 1 = 42.667 us. 391 = 16.67 ms */ #define CPU_DOWNCLOCK_DETERMINATION_INTERVAL 46874 /* 23437 = 1 s */ |