init m05e02, in decimal

module05/ex02/main.c

@@ -0,0 +1,29 @@
+#include "header.h"
+
+// 1.1.7 : AVCC is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6
+// 1.1.8 : AREF is the analog reference pin for the A/D Converter
+// 24.4 : frequency needs to be between 50kHz and 200kHz, for less than 10bits accuracy it can be >200kHz
+//  -> Frequence_ADC = Frequance_CPU / Prescaler (Fadc = Fcpu/P):
+//     - P = 2   -> Fadc = 16,000,000 / 2   = 8,000,000 = 8MHz
+//     - P = 4   -> Fadc = 16,000,000 / 4   = 4,000,000 = 4MHz
+//     - P = 8   -> Fadc = 16,000,000 / 8   = 2,000,000 = 2MHz
+//     - P = 16  -> Fadc = 16,000,000 / 16  = 1,000,000 = 1MHz
+//     - P = 32  -> Fadc = 16,000,000 / 32  =   500,000 = 500KHz
+//     - P = 64  -> Fadc = 16,000,000 / 64  =   250,000 = 250KHz -> OK
+//     - P = 128 -> Fadc = 16,000,000 / 128 =   125,000 = 125KHz -> OK
+
+#define ADC_PRESCALER	128						// Table 24-5 : can only be 2, 4, 8, 16, 32, 64, or 128
+
+volatile uint8_t adc_channel = 0;				// Table 14-6 : alternate function for RV1 on PC0 -> ADC0, LDR on PC1 -> ADC1, NTC on PC2 -> ADC2 ...
+
+// read 3 analog values at 10 bits and print them in uart as decimal : potentiometer RV1 (Variable Resistor), photoresistor LDR (Light Dependent Resistor), thermistor NTC (Negative Temperature Coefficient)
+int main() {
+    char buffer[4];
+	SREG |= ENABLE_GLOBAL_INTERRUPT;			// 7.3.1 : Status Register, bit 7 : I – Global Interrupt Enable
+	uart_init();
+	adc_init(ADC_PRESCALER);
+
+	timer_1B_init();
+
+	while(1);
+}