32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
#include "header.h"
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// 1.1.7 : AVCC is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6
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// 1.1.8 : AREF is the analog reference pin for the A/D Converter
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#define ADC_PRESCALER 8
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void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) { // num_digits : number of digit of the output, ex 2 for 3FF (1023) -> FF
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for (uint8_t i = 0; i < num_digits; ++i) {
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uint8_t shift = (num_digits - 1 - i) * 4;
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out[i] = INT_TO_HEX_CHAR((value >> shift) & 0x0F);
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}
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out[num_digits] = '\0';
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}
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// description
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int main() {
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char buffer[4];
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SREG |= ENABLE_GLOBAL_INTERRUPT; // 7.3.1 : Status Register, bit 7 : I – Global Interrupt Enable
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uart_init();
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adc_init(ADC_PRESCALER);
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while(1) {
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uint16_t value = adc_read(0); // Read from ADC0 (A0)
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int_to_hex_string(value, buffer, 3);
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uart_printstr_endl(buffer);
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_delay_ms(20); // Wait 20ms
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}
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}
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// ISR(ADC_vect) { // Table 12-6 : interrupt vector for ADC Conversion Complete
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// }
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