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MPIO HD200/HD300: Decrease ADC scanrate.

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The adclk is decreased 4x. This solves problems with battery
readout drop during system startup.

Change-Id: I46d7c4b9ffcfdc812a6dd2a932c9e397d33c1168
This commit is contained in:
Marcin Bukat 2012-01-24 11:53:22 +01:00
parent 2ab2857b58
commit e94d1b0ab0
2 changed files with 11 additions and 31 deletions
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30
firmware/target/coldfire/mpio/adc-mpio.c
View file

@ -28,17 +28,11 @@
volatile unsigned short adc_data[NUM_ADC_CHANNELS] IBSS_ATTR;
/* Reading takes 4096 adclk ticks
* 1) tick task is created that enables ADC interrupt
* 2) On interrupt single channel is readed and
* ADC is prepared for next channel
* 3) When all 4 channels are scanned ADC interrupt is disabled
*/
void ADC(void) __attribute__ ((interrupt_handler,section(".icode")));
void ADC(void)
{
static unsigned char channel IBSS_ATTR;
/* read current value */
adc_data[(channel&0x03)] = ADVALUE;
@ -48,15 +42,10 @@ void ADC(void)
* ADCONFIG is 16bit wide so we have to shift data by 16bits left
* thats why we shift <<24 instead of <<8
*/
channel++;
and_l(~(0x03<<24),&ADCONFIG);
or_l( (((channel&0x03) << 8 )|(1<<7))<<16, &ADCONFIG);
if ( (channel & 0x03) == 0 )
/* disable ADC interrupt */
and_l((~(1<<6))<<16,&ADCONFIG);
}
unsigned short adc_scan(int channel)
@ -65,12 +54,6 @@ unsigned short adc_scan(int channel)
return adc_data[(channel&0x03)];
}
void adc_tick(void)
{
/* enable ADC interrupt */
or_l( ((1<<6))<<16, &ADCONFIG);
}
void adc_init(void)
{
/* GPIO38 GPIO39 */
@ -79,19 +62,16 @@ void adc_init(void)
/* ADOUT_SEL = 01
* SOURCE SELECT = 000
* CLEAR INTERRUPT FLAG
* ENABLE INTERRUPT = 0
* ENABLE INTERRUPT = 1
* ADOUT_DRIVE = 00
* ADCLK_SEL = 011 (busclk/8)
* ADCLK_SEL = 011 (busclk/64)
*/
ADCONFIG = (1<<10)|(1<<8)|(1<<7)|0x03;
ADCONFIG = (1<<10)|(1<<7)|(1<<6)|0x06;
/* ADC interrupt level 4.0 */
or_l((4<<28), &INTPRI8);
/* create tick task which enables ADC interrupt */
tick_add_task(adc_tick);
/* let the interrupt handler fill readout array */
sleep(2);
sleep(HZ/10);
}