Mercurial > pihelp

comparison main.c @ 31:5d6a841eef82

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
/128 prescaler for adc
author Matt Johnston <matt@ucc.asn.au>
date Thu, 27 Jun 2013 00:12:32 +0800
parents ce5097eacf2f
children cce426bb6d3e
comparison
equal deleted inserted replaced
30:320c8cc7df5a 31:5d6a841eef82
760 static void 760 static void
761 adc_generic(uint8_t admux, uint8_t *ret_num, uint16_t *ret_sum) 761 adc_generic(uint8_t admux, uint8_t *ret_num, uint16_t *ret_sum)
762 { 762 {
763 PRR &= ~_BV(PRADC); 763 PRR &= ~_BV(PRADC);
764 764
765 // /64 prescaler, interrupt 765 // /128 prescaler (86kHz), interrupt
766 ADCSRA = _BV(ADEN) | _BV(ADPS2) | _BV(ADPS1) | _BV(ADIE); 766 ADCSRA = _BV(ADEN)
767 | _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0)
768 | _BV(ADIE);
767 769
768 // set to measure 1.1 reference 770 // set to measure 1.1 reference
769 ADMUX = admux; 771 ADMUX = admux;
770 772
771 // delay after setting reference etc, allow settling 773 // delay after setting reference etc, allow settling