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small tweaks to how ADC channels are enabled.

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This commit is contained in:
Mariano Alvira 2012-10-21 11:38:37 -04:00
parent 009180e0a9
commit b9defeee02
3 changed files with 39 additions and 16 deletions
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39
lib/adc.c
View file

@ -34,9 +34,7 @@
*/
#include <stdint.h>
#include "crm.h"
#include "adc.h"
#include "gpio-util.h"
#include "mc1322x.h"
//#define ADC_CHANS_ENABLED 0x3F // channels 0-5 enabled
//#define ADC_CHANS_ENABLED 0x7E // channels 1-6 enabled
@ -73,9 +71,26 @@ void adc_service(void) {
}
}
void adc_init(void) {
uint8_t n;
#define _adc_setup_chan(x) do { \
if ( channel == x ) { \
ADC->SEQ_1bits.CH##x = 1; \
GPIO->FUNC_SEL.ADC##x = 1; \
GPIO->PAD_DIR.ADC##x = 0; \
GPIO->PAD_PU_EN.ADC##x = 0; \
}} while (0)
void adc_setup_chan(uint8_t channel) {
_adc_setup_chan(0);
_adc_setup_chan(1);
_adc_setup_chan(2);
_adc_setup_chan(3);
_adc_setup_chan(4);
_adc_setup_chan(5);
_adc_setup_chan(6);
_adc_setup_chan(7);
}
void adc_init(void) {
ADC->CLOCK_DIVIDER = 80; // 300 KHz
ADC->PRESCALE = ADC_PRESCALE_VALUE - 1; // divide by 24 for 1MHz.
@ -114,13 +129,13 @@ void adc_init(void) {
ADC->SR_1_LOW = (REF_OSC / ADC_PRESCALE_VALUE) / (115200 / 8) + 1;
#endif
ADC->SEQ_1 = 0
ADC->SEQ_1 = 0;
#if ADC_USE_TIMER
| (1 << 15) // sequence based on Timer 1.
ADC->SEQ_1bits.SEQ_MODE = 1; // sequence based on Timer 1
#else
| (0 << 15) // sequence based on convert time.
ADC->SEQ_1bits.SEQ_MODE = 0; // sequence based on convert time.
#endif
| ADC_CHANS_ENABLED;
ADC->SEQ_1bits.BATT = 1;
ADC->CONTROL = 0xF001
//#if ADC_USE_TIMER
@ -129,10 +144,4 @@ void adc_init(void) {
;
ADC->OVERRIDE = (1 << 8);
for (n=0; n<=8; n++) {
if ((ADC_CHANS_ENABLED >> n) & 1) {
gpio_select_function(30 + n, 1); // Function 1 = ADC
gpio_set_pad_dir(30 + n, PAD_DIR_INPUT);
}
}
}

9
lib/include/adc.h
View file

@ -39,6 +39,9 @@
#include <stdint.h>
#include "utils.h"
/* the Vbatt measurment reads about 200mV low --- trim by ADC_VBATT_TRIM */
#define ADC_VBATT_TRIM 200
/* ADC registers are all 16-bit wide with 16-bit access only */
#define ADC_BASE (0x8000D000)
@ -153,8 +156,14 @@ static volatile struct ADC_struct * const ADC = (void *) (ADC_BASE);
#define adc_enable() (ADC->CONTROLbits.ON = 1)
#define adc_disable() (ADC->CONTROLbits.ON = 0)
#define adc_select_channels(chans) (ADC->SEQ_1 = (ADC->SEQ_1 & 0xFE00) | chans)
void adc_setup_chan(uint8_t channel);
extern uint16_t adc_reading[NUM_ADC_CHAN];
/* use the internal reference to return adc_readings in mV */
#define adc_voltage(x) (adc_reading[x] * 1200/adc_reading[8])
/* return vbatt voltage in mV */
#define adc_vbatt 4095 * 1200/adc_reading[8] + ADC_VBATT_TRIM
void ADC_flush(void);
uint16_t ADC_READ(void);
void read_scanners(void);

7
tests/adc.c
View file

@ -52,12 +52,17 @@ int main(void)
printf("\x1B[2J"); // clear screen
for (c=0; c<=7; c++) {
adc_setup_chan(c);
}
for(;;) {
printf("\x1B[H"); // cursor home
printf("# Value\r\n");
for (c=0; c<NUM_ADC_CHAN; c++) {
adc_service();
printf("%u %04u\r\n", c, adc_reading[c]);
printf("%u %04u %04u mV\r\n", c, adc_reading[c], adc_voltage(c));
}
printf("vbatt: %04u mV", adc_vbatt);
}
}