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Atomic GPIO access

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7114 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-07-12 07:25:01 +00:00
parent d2ca7fc5de
commit 192a604cd4
4 changed files with 43 additions and 42 deletions
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23
firmware/drivers/adc.c
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@ -18,6 +18,7 @@
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "thread.h"
#include "adc.h"
@ -111,11 +112,11 @@ static unsigned char adcdata[NUM_ADC_CHANNELS];
#define CS_LO GPIO_OUT &= ~0x80
#define CS_HI GPIO_OUT |= 0x80
#define CLK_LO GPIO_OUT &= ~0x00400000
#define CLK_HI GPIO_OUT |= 0x00400000
#define CLK_LO and_l(~0x00400000, &GPIO_OUT)
#define CLK_HI or_l(0x00400000, &GPIO_OUT)
#define DO (GPIO_READ & 0x80000000)
#define DI_LO GPIO_OUT &= ~0x00200000
#define DI_HI GPIO_OUT |= 0x00200000
#define DI_LO and_l(~0x00200000, &GPIO_OUT)
#define DI_HI or_l(0x00200000, &GPIO_OUT)
/* delay loop */
#define DELAY do { int _x; for(_x=0;_x<10;_x++);} while (0)
@ -194,13 +195,13 @@ static void adc_tick(void)
void adc_init(void)
{
GPIO_FUNCTION |= 0x80600080; /* GPIO7: CS
GPIO21: Data In (to the ADC)
GPIO22: CLK
GPIO31: Data Out (from the ADC) */
GPIO_ENABLE |= 0x00600080;
GPIO_OUT |= 0x80; /* CS high */
GPIO_OUT &= ~0x00400000; /* CLK low */
or_l(0x80600080, &GPIO_FUNCTION); /* GPIO7: CS
GPIO21: Data In (to the ADC)
GPIO22: CLK
GPIO31: Data Out (from the ADC) */
or_l(0x00600080, &GPIO_ENABLE);
or_l(0x80, &GPIO_OUT); /* CS high */
and_l(~0x00400000, &GPIO_OUT); /* CLK low */
adc_scan(ADC_BATTERY);