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This commit is contained in:
hugogogo
2025-03-13 16:02:27 +01:00
parent 24158c8f4d
commit 7ca02352d9
7 changed files with 62 additions and 36 deletions
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3
.vscode/settings.json vendored
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@@ -9,6 +9,7 @@
"bitmanip.h": "c",
"rush_header.h": "c",
"twi.h": "c",
"header.h": "c"
"header.h": "c",
"adc.h": "c"
}
}

3
headers/utils.h
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@@ -12,9 +12,10 @@
// mathematics
#define PERCENT(percent, total) (((float)percent / 100) * total)
#define DIV_ROUND_CLOSEST(n, d) ((((n) < 0) == ((d) < 0)) ? (((n) + (d)/2)/(d)) : (((n) - (d)/2)/(d)))
#define INT_TO_HEX_CHAR(n) ((n) < 10 ? ('0' + (n)) : ('A' + ((n) - 10)))
// text
#define SWITCH_CASE(ch) (((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z') ? ((ch) ^ (1 << 5)) : (ch))
#define SWITCH_CASE(ch) (((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z') ? ((ch) ^ (1 << 5)) : (ch))
// boolean
#define TRUE 1

27
module05/ex00/adc.c Normal file
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@@ -0,0 +1,27 @@
#include "header.h"
// Table 14-6. Port C Pins Alternate Functions
// - PC0 -> ADC0 (ADC Input Channel 0)
// -> PCINT8 (Pin Change Interrupt 8)
//
// 24.2 : The ADC generates a 10-bit result which is presented in the ADC Data Registers, ADCH and ADCL
//
// START A CONVERSTION in single conversion mode :
// - disabling the Power Reduction ADC bit, PRADC
// - writing a logical one to the ADC Start Conversion bit, ADSC
#define ADC_PRESCALER 8
void adc_init() {
ADMUX = (1 << REFS0); // Table 24-3 : set voltage reference, AVCC with external capacitor at AREF pin
ADCSRA = (1 << ADEN) // 24.9.2 : enable ADC
| ADC_PRESCALE_SET(ADC_PRESCALER); // Table 24-5 : prescaler ADC
}
uint16_t adc_read(uint8_t channel) {
CLEAR(PRR, PRADC); // 24.3 : ensure power reduction is disabled for ADC, (10.11.3 : PRR – Power Reduction Register)
ADMUX = (ADMUX & 0xF0) | (channel & 0x0F); // Select ADC channel
ADCSRA |= (1 << ADSC); // 24.9.2 : Start conversion, ADSC: ADC Start Conversion
while (ADCSRA & (1 << ADSC)); // Wait for completion
return ADC;
}

15
module05/ex00/adc.h Normal file
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@@ -0,0 +1,15 @@
#ifndef ADC_H
#define ADC_H
// Table 24-5 : prescaler ADC
#define ADC_PRESCALE_SET(value) \
((value) == 2 ? (0<<ADPS2 | 0<<ADPS1 | 1<<ADPS0) : \
(value) == 4 ? (0<<ADPS2 | 1<<ADPS1 | 0<<ADPS0) : \
(value) == 8 ? (0<<ADPS2 | 1<<ADPS1 | 1<<ADPS0) : \
(value) == 16 ? (1<<ADPS2 | 0<<ADPS1 | 0<<ADPS0) : \
(value) == 32 ? (1<<ADPS2 | 0<<ADPS1 | 1<<ADPS0) : \
(value) == 64 ? (1<<ADPS2 | 1<<ADPS1 | 0<<ADPS0) : \
(value) == 128 ? (1<<ADPS2 | 1<<ADPS1 | 1<<ADPS0) : \
(0<<ADPS2 | 0<<ADPS1 | 0<<ADPS0))
#endif // ADC_H

6
module05/ex00/header.h
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@@ -10,15 +10,21 @@
#include "interrupt.h"
#include "timer.h"
#include "usart.h"
#include "adc.h"
//
// PROTOTYPES
//
// main.c
void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits);
// adc.c
void adc_init();
uint16_t adc_read(uint8_t channel);
// uart.c
void uart_init();
void uart_tx(char c);
void uart_printstr(const char* str);
void uart_printstr_endl(const char* str)
//
// MACROS

39
module05/ex00/main.c
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@@ -1,12 +1,5 @@
#include "header.h"
// Table 14-6. Port C Pins Alternate Functions
// - PC0 -> ADC0 (ADC Input Channel 0)
// -> PCINT8 (Pin Change Interrupt 8)
//
// 24.2 : The ADC generates a 10-bit result which is presented in the ADC Data Registers, ADCH and ADCL
#define INT_TO_HEX_CHAR(n) ((n) < 10 ? ('0' + (n)) : ('A' + ((n) - 10)))
void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {
for (uint8_t i = 0; i < num_digits; ++i) {
uint8_t shift = (num_digits - 1 - i) * 4;
@@ -14,41 +7,19 @@ void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {
}
out[num_digits] = '\0';
}
void word_to_hex(uint16_t value, char *out) {
out[0] = INT_TO_HEX_CHAR((value >> 8) & 0x0F);
out[1] = INT_TO_HEX_CHAR((value >> 4) & 0x0F);
out[2] = INT_TO_HEX_CHAR(value & 0x0F);
out[3] = '\0';
}
void adc_init() {
ADMUX = (1 << REFS0); // AVcc reference, ADC0
ADCSRA = (1 << ADEN) // Enable ADC
| (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // Prescaler = 128
}
uint16_t adc_read(uint8_t channel) {
ADMUX = (ADMUX & 0xF0) | (channel & 0x0F); // Select ADC channel
ADCSRA |= (1 << ADSC); // Start conversion
while (ADCSRA & (1 << ADSC)); // Wait for completion
return ADC;
}
// description
int main() {
char buffer[4];
const char buffer[4];
SREG |= ENABLE_GLOBAL_INTERRUPT; // 7.3.1 : Status Register, bit 7 : I – Global Interrupt Enable
uart_init();
adc_init();
while(1) {
uint16_t value = adc_read(0); // Read from ADC0 (A0)
// snprintf(buffer, sizeof(buffer), "ADC: %u\r\n", value);
word_to_hex(value, buffer);
uart_printstr(buffer);
uart_printstr("\r\n");
_delay_ms(20); // Wait 20ms
uint16_t value = adc_read(0); // Read from ADC0 (A0)
int_to_hex_string(value, buffer, 3);
uart_printstr_endl(buffer);
_delay_ms(20); // Wait 20ms
}
}

5
module05/ex00/uart.c
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@@ -34,6 +34,11 @@ void uart_printstr(const char* str) {
}
}
void uart_printstr_endl(const char* str) {
uart_printstr(str);
uart_printstr("\r\n");
}
// ISR(USART_RX_vect) { // Table 12-6 : we select the code for USART Receive
// char received_char = UDR0; // read received character
// if (received_char == '\b' || received_char == 127) { // if backspace is received