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optimisations in adc code

This commit is contained in:
Lucas Pleß 2013-06-12 15:30:15 +02:00
parent ea03c8ca67
commit ee0f2a921d
2 changed files with 8 additions and 7 deletions
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9
display/software/powerboard/src/adc.c
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@ -30,12 +30,13 @@ uint16_t adc_read_single(uint8_t channel) {
return ADCW; return ADCW;
} }
uint16_t adc_read_avg(uint8_t channel, uint8_t nsamples) { uint16_t adc_read_avg(const uint8_t channel, const uint8_t nsamples) {
uint32_t sum = 0; uint16_t sum = 0;
uint8_t count = nsamples % 60;
for (uint8_t i=0; i<nsamples;++i ) { for (uint8_t i=0; i<count;++i ) {
sum += adc_read_single(channel); sum += adc_read_single(channel);
} }
return (uint16_t)(sum / nsamples); return (sum / count);
} }

6
display/software/powerboard/src/adc.h
View File

@ -1,8 +1,8 @@
#ifndef _adc_h #ifndef _adc_h
#define _adc_h #define _adc_h
void adc_init(void); extern void adc_init(void);
uint16_t adc_read_single(uint8_t); extern uint16_t adc_read_single(uint8_t);
uint16_t adc_read_avg(uint8_t, uint8_t); extern uint16_t adc_read_avg(uint8_t, uint8_t);
#endif #endif