From b627106392148be3eb0066e8f1633ec6935d3651 Mon Sep 17 00:00:00 2001 From: Marcin Bukat Date: Tue, 18 May 2010 12:29:21 +0000 Subject: HD200 - change how adc is scanned (inspired by amiconn) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26138 a1c6a512-1295-4272-9138-f99709370657 --- firmware/target/coldfire/mpio/hd200/adc-hd200.c | 30 ++++++++++++++++--------- 1 file changed, 20 insertions(+), 10 deletions(-) (limited to 'firmware/target/coldfire/mpio/hd200/adc-hd200.c') diff --git a/firmware/target/coldfire/mpio/hd200/adc-hd200.c b/firmware/target/coldfire/mpio/hd200/adc-hd200.c index 8a64e00443..3e162a2251 100644 --- a/firmware/target/coldfire/mpio/hd200/adc-hd200.c +++ b/firmware/target/coldfire/mpio/hd200/adc-hd200.c @@ -29,18 +29,16 @@ volatile unsigned short adc_data[NUM_ADC_CHANNELS] IBSS_ATTR; /* Reading takes 4096 adclk ticks - * We do read one channel at once - * - * state FCPU Fbus Fadc bus/Fadc Fchannelread - * default 11.2896 MHz 5.6448 MHz 5.6448 MHz 2 172.2656 Hz - * normal 45.1584 MHz 22.5792 MHz 2.8224 MHz 8 172.2656 Hz - * max 124.1856 MHz 62.0928 MHz 1.9404 MHz 32 118.4326 Hz + * 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 int channel IBSS_ATTR; + static unsigned char channel IBSS_ATTR; /* read current value */ adc_data[(channel & 0x03)] = ADVALUE; @@ -55,7 +53,10 @@ void ADC(void) and_l(~(3<<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) @@ -64,6 +65,12 @@ 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 */ @@ -72,13 +79,16 @@ void adc_init(void) /* ADOUT_SEL = 01 * SOURCE SELECT = 000 * CLEAR INTERRUPT FLAG - * ENABLE INTERRUPT = 1 + * ENABLE INTERRUPT = 0 * ADOUT_DRIVE = 00 * ADCLK_SEL = 011 (busclk/8) */ - ADCONFIG = (1<<10)|(1<<7)|(1<<6)|(1<<1)|(1<<0); + ADCONFIG = (1<<10)|(1<<7)|(1<<1)|(1<<0); /* ADC interrupt level 4.0 */ or_l((4<<28), &INTPRI8); + + /* create tick task which enables ADC interrupt */ + tick_add_task(adc_tick); } -- cgit v1.2.3