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authorMarcoen Hirschberg <marcoen@gmail.com>2007-02-08 10:21:37 +0000
committerMarcoen Hirschberg <marcoen@gmail.com>2007-02-08 10:21:37 +0000
commite645e2dcf2cc03c7e4c9a9d26ac93bbf82e8414b (patch)
tree616413a217662ee8f0f4c30c0c3ecd8785682829
parent6dd8fbe25d5c91f7ba101b6c68c02c5c796cce1b (diff)
downloadrockbox-e645e2dcf2cc03c7e4c9a9d26ac93bbf82e8414b.tar.gz
rockbox-e645e2dcf2cc03c7e4c9a9d26ac93bbf82e8414b.zip
Fix the delay loops. Without scaling the CPU is always at 300MHz.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12229 a1c6a512-1295-4272-9138-f99709370657
-rw-r--r--firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c2
-rw-r--r--firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c6
2 files changed, 4 insertions, 4 deletions
diff --git a/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c b/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c
index fd5d9577a3..770f4eb4e6 100644
--- a/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c
+++ b/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c
@@ -90,7 +90,7 @@ static void i2c_delay(void)
90 /* about 30 cycles overhead + X * 7 */ 90 /* about 30 cycles overhead + X * 7 */
91 /* 300MHz: 1000nS @3.36nS/cyc = 297cyc: X = 38*/ 91 /* 300MHz: 1000nS @3.36nS/cyc = 297cyc: X = 38*/
92 /* 100MHz: 1000nS @10nS/cyc = 100cyc : X = 10 */ 92 /* 100MHz: 1000nS @10nS/cyc = 100cyc : X = 10 */
93 for (_x = get_cpu_boost_counter() ? 38 : 10; _x; _x--) 93 for (_x = 38; _x; _x--)
94 { 94 {
95 /* burn CPU cycles */ 95 /* burn CPU cycles */
96 /* gcc makes it an inc loop - check with objdump for asm timing */ 96 /* gcc makes it an inc loop - check with objdump for asm timing */
diff --git a/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c b/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
index d4e061a0c7..f9cb35f884 100644
--- a/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
+++ b/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
@@ -30,9 +30,9 @@
30/* cycles delayed = 30 + 7 * loops */ 30/* cycles delayed = 30 + 7 * loops */
31/* 100MHz = 10nS per cycle: LO:1300nS=130:14 HI:600nS=60:9 */ 31/* 100MHz = 10nS per cycle: LO:1300nS=130:14 HI:600nS=60:9 */
32/* 300MHz = 3.36nS per cycle: LO:1300nS=387:51 HI:600nS=179:21 */ 32/* 300MHz = 3.36nS per cycle: LO:1300nS=387:51 HI:600nS=179:21 */
33#define DELAY_LO do{int x;for(x=get_cpu_boost_counter()?51:14;x;x--);} while (0) 33#define DELAY_LO do{int x;for(x=51;x;x--);} while (0)
34#define DELAY do{int x;for(x=get_cpu_boost_counter()?35:10;x;x--);} while (0) 34#define DELAY do{int x;for(x=35;x;x--);} while (0)
35#define DELAY_HI do{int x;for(x=get_cpu_boost_counter()?21: 9;x;x--);} while (0) 35#define DELAY_HI do{int x;for(x=21;x;x--);} while (0)
36 36
37 37
38 38