devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

iPod 1st Gen: Fix battery ADC not working due to the EABI compiler optimizing the delay loops away. Use udelay() instead, not wasting CPU time when the CPU is not boosted.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27850 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2010-08-20 22:21:07 +00:00
parent 43ccc1eef7
commit 0a080891e7
1 changed files with 7 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

13
firmware/target/arm/ipod/1g2g/adc-ipod-1g2g.c
View file

@ -25,6 +25,7 @@
#include "kernel.h" #include "kernel.h"
#include "adc.h" #include "adc.h"
#include "adc-target.h" #include "adc-target.h"
#include "system-target.h"
static struct mutex adc_mtx SHAREDBSS_ATTR; static struct mutex adc_mtx SHAREDBSS_ATTR;
@ -41,24 +42,24 @@ unsigned short adc_scan(int channel)
if ((IPOD_HW_REVISION >> 16) == 1) if ((IPOD_HW_REVISION >> 16) == 1)
{ {
int i, j; int i;
unsigned pval = GPIOB_OUTPUT_VAL; unsigned pval = GPIOB_OUTPUT_VAL;
GPIOB_OUTPUT_VAL = pval | 0x04; /* B2 -> high */ GPIOB_OUTPUT_VAL = pval | 0x04; /* B2 -> high */
for (i = 32; i > 0; --i); udelay(2);
GPIOB_OUTPUT_VAL = pval; /* B2 -> low */ GPIOB_OUTPUT_VAL = pval; /* B2 -> low */
for (i = 200; i > 0; --i); udelay(10);
for (j = 0; j < 8; j++) for (i = 0; i < 8; i++)
{ {
GPIOB_OUTPUT_VAL = pval | 0x02; /* B1 -> high */ GPIOB_OUTPUT_VAL = pval | 0x02; /* B1 -> high */
for (i = 8; i > 0; --i); udelay(1);
data = (data << 1) | ((GPIOB_INPUT_VAL & 0x08) >> 3); data = (data << 1) | ((GPIOB_INPUT_VAL & 0x08) >> 3);
GPIOB_OUTPUT_VAL = pval; /* B1 -> low */ GPIOB_OUTPUT_VAL = pval; /* B1 -> low */
for (i = 320; i > 0; --i); udelay(15);
} }
} }
else if ((IPOD_HW_REVISION >> 16) == 2) else if ((IPOD_HW_REVISION >> 16) == 2)