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Increase button delays in preperation for frequency scaling.

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When run at lower clock speeds, delays seem to need to be a little
longer in absolute time.

Change-Id: I5373f43094302e6fa3f0a79126e54cfccd90f5a4
This commit is contained in:
Michael Giacomelli 2016-01-18 23:51:25 +01:00
parent 784790dbec
commit 9f364a13c6
1 changed files with 3 additions and 2 deletions
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5
firmware/target/arm/as3525/sansa-fuzev2/button-fuzev2.c
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@ -246,12 +246,13 @@ int button_read_device(void)
GPIOB_DIR &= ~(1<<1); GPIOB_DIR &= ~(1<<1);
GPIOB_PIN(0) = 1<<0; GPIOB_PIN(0) = 1<<0;
udelay(4); /*note that lower delays (4, 2 us) work without frequency scaling*/
udelay(20);
gpiod6 = GPIOD_PIN(6); gpiod6 = GPIOD_PIN(6);
GPIOB_PIN(0) = 0; GPIOB_PIN(0) = 0;
udelay(2); udelay(5);
btn = GPIOC_PIN_MASK(0x3e) | (GPIOB_PIN(1) >> 1); btn = GPIOC_PIN_MASK(0x3e) | (GPIOB_PIN(1) >> 1);