avr/avr_demo
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This commit is contained in:
Mika Tuupola 2011-10-23 17:26:05 +03:00
parent 28daa804b4
commit 3d00faf639
1 changed files with 26 additions and 26 deletions
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34
adxl335/analog.c
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@ -17,45 +17,45 @@
uint16_t analog_read(uint8_t pin) { uint16_t analog_read(uint8_t pin) {
/* Enable ADC and set prescaler. */ /* Enable ADC and set prescaler. */
ADCSRA = _BV(ADEN) | ADC_PRESCALER; ADCSRA = _BV(ADEN) | ADC_PRESCALER;
/* Set high speed mode. */ /* Set high speed mode. */
ADCSRB |= _BV(ADHSM); ADCSRB |= _BV(ADHSM);
/* Set adc reference and select mux. */ /* Set adc reference and select mux. */
ADMUX = ADC_REF | (pin & 0b00011111); ADMUX = ADC_REF | (pin & 0b00011111);
/* Start conversion. */ /* Start conversion. */
ADCSRA |= _BV(ADSC); ADCSRA |= _BV(ADSC);
/* Wait until adc has result ready. */ /* Wait until adc has result ready. */
loop_until_bit_is_clear(ADCSRA, ADSC); loop_until_bit_is_clear(ADCSRA, ADSC);
/* Word! */ /* Word! */
return ADCW; return ADCW;
} }
uint8_t analog_read_byte(uint8_t pin) { uint8_t analog_read_byte(uint8_t pin) {
/* Enable ADC and set prescaler. */ /* Enable ADC and set prescaler. */
ADCSRA = _BV(ADEN) | ADC_PRESCALER; ADCSRA = _BV(ADEN) | ADC_PRESCALER;
/* Set high speed mode. */ /* Set high speed mode. */
ADCSRB |= _BV(ADHSM); ADCSRB |= _BV(ADHSM);
/* Set adc reference and select mux. */ /* Set adc reference and select mux. */
ADMUX = ADC_REF | (pin & 0b00011111); ADMUX = ADC_REF | (pin & 0b00011111);
/* Left adjust the 10 bit result. */ /* Left adjust the 10 bit result. */
ADMUX |= (1<<ADLAR); ADMUX |= (1<<ADLAR);
/* Start conversion. */ /* Start conversion. */
ADCSRA |= _BV(ADSC); ADCSRA |= _BV(ADSC);
/* Wait until adc has result ready. */ /* Wait until adc has result ready. */
loop_until_bit_is_clear(ADCSRA, ADSC); loop_until_bit_is_clear(ADCSRA, ADSC);
/* Hight byte. */ /* Hight byte. */
return ADCH; return ADCH;
} }