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wip mod04 ex01

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hugo LAMY
2025-03-10 21:17:39 +01:00
parent e16552b4bc
commit 2aaaac6c57
9 changed files with 59 additions and 43 deletions
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1
module04/ex01/Makefile Normal file
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include ../../Makefile

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module04/ex01/bitmanip.h Normal file
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#ifndef BITMANIP_H
#define BITMANIP_H
#include "utils.h"
// Bit operations on registers
#define SET(register, bit) (register |= (1 << (bit)))
#define CLEAR(register, bit) (register &= ~(1 << (bit)))
#define TEST(register, bit) (register & (1 << (bit)))
#define TOGGLE(register, bit) (register ^= (1 << (bit)))
// Get arguments from tuple-like definitions
#define ARG_1(v1, v2) v1
#define ARG_2(v1, v2) v2
#define GET_PORT(args) ARG_1 args
#define GET_BIT(args) ARG_2 args
// // version with "LED1 B, D1" without parenthesis
// #define ARG_1(v1, ...) v1
// #define ARG_2(v1, v2, ...) v2
// #define GET_PORT(...) ARG_1(__VA_ARGS__)
// #define GET_BIT(...) ARG_2(__VA_ARGS__)
// Actions on elements
// #define SET_ELEM(...) SET(CONCAT(PORT, GET_PORT(__VA_ARGS__)), GET_BIT(__VA_ARGS__)) // version for "LED1 B, D1" without parenthesis
#define SET_ELEM(elem) SET(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
#define CLEAR_ELEM(elem) CLEAR(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
#define TEST_ELEM(elem) TEST(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
#define TOGGLE_ELEM(elem) TOGGLE(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
#define MODE_OUTPUT(elem) SET(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
#define MODE_INPUT(elem) CLEAR(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
#define TOGGLE_PIN(elem) SET(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem))
#define TEST_PIN(elem) (TEST(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem)))
#define IS_PIN_SET(elem) (TEST_PIN(elem) == 0)
#define IS_PIN_CLEAR(elem) (TEST_PIN(elem) == 1)
#define PULLUP_ON(elem) SET(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
#define PULLUP_OFF(elem) CLEAR(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
// Bit definitions
#define D1 0
#define D2 1
#define D3 2
#define D4 4
#define SW1 2
#define SW2 4
#define D5B 3
#define D5R 5
#define D5G 6
// Elements (port, bit)
#define LED1 (B, D1)
#define LED2 (B, D2)
#define LED3 (B, D3)
#define LED4 (B, D4)
#define BUTTON1 (D, SW1)
#define BUTTON2 (D, SW2)
#define RGB5_BLUE (D, D5B)
#define RGB5_RED (D, D5R)
#define RGB5_GEEN (D, D5G)
#endif // BITMANIP_H

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module04/ex01/header.h Normal file
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#ifndef HEADER_H
#define HEADER_H
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include "utils.h"
#include "bitmanip.h"
#include "interrupt.h"
#include "timer.h"
//
// PROTOTYPES
//
// main.c
#endif // HEADER_H

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module04/ex01/interrupt.h Normal file
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#ifndef INTERRUPT_H
#define INTERRUPT_H
// 7.3.1 : SREG – AVR Status Register
#define ENABLE_GLOBAL_INTERRUPT (1<<SREG_I)
#define DISABLE_GLOBAL_INTERRUPT (0<<SREG_I)
#endif // INTERRUPT_H

58
module04/ex01/main.c Normal file
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#include "header.h"
// 14.3.1 : alternate functions for led2 PB1
// - OC1A (Timer/Counter1 Output Compare Match A Output)
// - 16.11.1 controlled by COM1A1:0 in TCCR1A
// - Table 16-2 : Compare Output Mode, Fast PWM
// (1 << COM1A1) | (0 << COM1A0) -> non-inverting mode
// - Table 16-4 : set timer 1 in fast PWM mode, with top as ICR1 or OCR1A
// - ICR1 : Input Capture Register ((1 << WGM13) | (1 << WGM12) | (1 << WGM11) | (0 << WGM10))
// - OCR1A : Output Compare Register ((1 << WGM13) | (1 << WGM12) | (1 << WGM11) | (1 << WGM10))
// -> if OCR1A is top, it's also duty cycle, so changing duty cycle will also change frequency
// -> if ICR1 is top, OCR1A is duty cycle, so it can be changed independantly
// - PCINT1 (Pin Change Interrupt 1) : to interrupt when pin change, in input mode only
// calulations
// - frequency is 16Mhz -> it means that the clock runs 16 000 000 times per seconds
// - and the timer1 can store 16 bits value of cycle -> which is 2^16 = 65536
// - so it will only last 65536/16000000 = 0,004096 second
// - if i want my cycle to be 0.001 second, prescaler 1 is enough
// - if i want my cycle to be 0.01 second, which prescaler ?
// - 8 * 0,004096 = 0.032768 -> it is enough
// - 64 * 0,004096 = 0.262144 -> it is largely enough
// - if i choose prescaler 1 for a duration of 0.001 seconds, i need to restart the clock after how many cycles :
// - (16000000 / 1) * 0.001 = 16000 ticks -> set ICR1 = 16000
// - if i choose prescaler 8 for a duration of 0.01 seconds, i need to restart the clock after how many cycles :
// - (16000000 / 8) * 0.01 = 20000 ticks -> set ICR1 = 20000
// - if i choose prescaler 64 for a duration of 0.01 seconds, i need to restart the clock after how many cycles :
// - (16000000 / 64) * 0.01 = 2500 ticks -> set ICR1 = 2500
// 16.9.3 : timer1 fast PWM
#define LED1_PWM_PRESCALER 8 // can be 1, 8, 64, 256, 1024
#define DUTY_CYCLE_PERCENT 9
#define FRQUENCY_MS 1
// use timers interruptions to varie led1 intensity using duty cycle, from 0% to 100% to 0% in 1 second
// timer1 sets the led duty cycle, timer0 change the duty cycle percentage
int main() {
MODE_OUTPUT(LED1);
CLEAR_ELEM(LED1);
MODE_OUTPUT(LED2);
CLEAR_ELEM(LED2);
SREG |= ENABLE_GLOBAL_INTERRUPT;
TCCR1A = (1 << WGM11); // Table 16-4 : set fast PWM mode with TOP ICR1, so we can use OCR1A for duty cycle and keep ICR1 for frequency
TCCR1B = (1 << WGM13) | (1 << WGM12);
TCCR1A |= (1 << COM1A1); // Table 16-2 : set non-inverting mode to trigger OC1A on fast PWM
TCCR1B |= PRESCALE_SET(LED1_PWM_PRESCALER); // Table 16-5 : set the appropriate prescale values
ICR1 = TIME_MS(FRQUENCY_MS, LED1_PWM_PRESCALER); // top value for Xms
OCR1A = PERCENT(DUTY_CYCLE_PERCENT, ICR1); // duty cycle frequence
while (1);
}

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module04/ex01/timer.h Normal file
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#ifndef TIMER_H
#define TIMER_H
// table 16-5 : prescale sets
#define PRESCALE_SET(value) \
((value) == 1 ? (0<<CS12 | 0<<CS11 | 1<<CS10) : \
(value) == 8 ? (0<<CS12 | 1<<CS11 | 0<<CS10) : \
(value) == 64 ? (0<<CS12 | 1<<CS11 | 1<<CS10) : \
(value) == 256 ? (1<<CS12 | 0<<CS11 | 0<<CS10) : \
(value) == 1024? (1<<CS12 | 0<<CS11 | 1<<CS10) : \
(0<<CS12 | 0<<CS11 | 0<<CS10))
#define TIME_MS(ms, prescale_value) (((F_CPU / prescale_value) * ms) / 1000)
// Table 16-4 : Waveform Generation Mode Bit Description
#define CTC_TOP_OCR1A_IN_TCCR1B (0<<WGM13 | 1<<WGM12)
#define CTC_TOP_OCR1A_IN_TCCR1A (0<<WGM11 | 0<<WGM10)
#define CTC_TOP_ICR1_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
#define CTC_TOP_ICR1_IN_TCCR1A (0<<WGM11 | 0<<WGM10)
#define FAST_PWM_TOP_OCR1A_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
#define FAST_PWM_TOP_OCR1A_IN_TCCR1A (1<<WGM11 | 1<<WGM10)
#define FAST_PWM_TOP_ICR1_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
#define FAST_PWM_TOP_ICR1_IN_TCCR1A (1<<WGM11 | 0<<WGM10)
// 16.11.8 : Timer/Counter1 Interrupt Mask Register
#define INTERRUPT_ENABLE_CHANNEL_A (1 << OCIE1A)
#define INTERRUPT_DISABLE_CHANNEL_A (0 << OCIE1A)
#endif // TIMER_H

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module04/ex01/usart.h Normal file
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#ifndef USART_H
#define USART_H
#define BAUD_PRESCALER(usart_baudrate) (DIV_ROUND_CLOSEST(F_CPU, (16 * usart_baudrate)) - 1)
// Table 20-8 : Mode Selection (USART Mode SELect)
#define ASYNCHRONOUS (0<<UMSEL01 | 0<<UMSEL00)
#define SYNCHRONOUS (0<<UMSEL01 | 1<<UMSEL00)
// Table 20-9 : Parity Bit Selection (USART Parity Mode)
#define PARITY_DISABLED (0<<UPM01 | 0<<UPM00)
#define PARITY_EVEN (1<<UPM01 | 0<<UPM00)
#define PARITY_ODD (1<<UPM01 | 1<<UPM00)
// Table 20-10 : Stop Bit Selection (USART Stop Bit Select)
#define STOP_ONE_BIT (0<<USBS0)
#define STOP_TWO_BIT (1<<USBS0)
// Table 20-11 : Data Bit Selection (USART Character SiZe)
#define DATA_FIVE_BIT (0<<UCSZ02 | 0<<UCSZ01 | 0<<UCSZ00)
#define DATA_SIX_BIT (0<<UCSZ02 | 0<<UCSZ01 | 1<<UCSZ00)
#define DATA_SEVEN_BIT (0<<UCSZ02 | 1<<UCSZ01 | 0<<UCSZ00)
#define DATA_EIGHT_BIT (0<<UCSZ02 | 1<<UCSZ01 | 1<<UCSZ00)
#define DATA_NINE_BIT (1<<UCSZ02 | 1<<UCSZ01 | 1<<UCSZ00)
// 20.11.3 : USART Control and Status Register B (UCSRnB)
#define RECEIVER_DISABLED (0<<RXEN0)
#define RECEIVER_ENABLED (1<<RXEN0)
#define TRANSMITTER_DISABLED (0<<TXEN0)
#define TRANSMITTER_ENABLED (1<<TXEN0)
#define INTERRUPT_RECEIVER_DISABLED (0<<RXCIE0)
#define INTERRUPT_RECEIVER_ENABLED (1<<RXCIE0)
#define INTERRUPT_TRANSMITTER_DISABLED (0<<TXCIE0)
#define INTERRUPT_TRANSMITTER_ENABLED (1<<TXCIE0)
#endif // USART_H

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module04/ex01/utils.h Normal file
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#ifndef UTILS_H
#define UTILS_H
// stringify
#define STRINGIFY_HELPER(x) #x
#define STRINGIFY(x) STRINGIFY_HELPER(x)
// concatenate
#define CONCAT_HELPER(x, y) x ## y
#define CONCAT(x, y) CONCAT_HELPER(x, y)
// 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)))
// text
#define SWITCH_CASE(ch) (((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= 'a' && (ch) <= 'z') ? ((ch) ^ (1 << 5)) : (ch))
// boolean
#define TRUE 1
#define FALSE 0
#endif // UTILS_H