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wip mod04 ex01

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This commit is contained in:
hugogogo
2025-03-11 18:41:21 +01:00
parent 692ad7f3ce
commit bb785d5209
4 changed files with 74 additions and 22 deletions
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3
Makefile
View File

@@ -74,6 +74,9 @@ flash:
restore:
avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:w:$(DUMP_ORI)
dump:
avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:r:dump.hex
clean:
rm -f main.hex main.bin *.o

20
module04/ex01/bitmanip.h
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@@ -36,16 +36,16 @@
#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
// Bit definitions (<pin number> // <pin name>)
#define D1 0 // PB0
#define D2 1 // PB1
#define D3 2 // PB2
#define D4 4 // PB4
#define SW1 2 // PD2
#define SW2 4 // PD4
#define D5B 3 // PD3
#define D5R 5 // PD5
#define D5G 6 // PD6
// Elements (port, bit)
#define LED1 (B, D1)

2
module04/ex01/header.h
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@@ -14,5 +14,7 @@
// PROTOTYPES
//
// main.c
void blink_led_1();
void vary_duty();
#endif // HEADER_H

71
module04/ex01/main.c
View File

@@ -27,11 +27,62 @@
// - 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
// alternatively, can use the default values :
// - Fast PWM, 8-bit, TOP 0x00FF (255)
// - Fast PWM, 9-bit, TOP 0x01FF (511)
// - Fast PWM, 10-bit, TOP 0x03FF (1023)
// no need to set a second for the "blinking" with PWM and duty cycle :
// only need to use a top value convenient, like a multiple of 100
// if choose top value of 100 :
// - at prescaler 1 : 100 / 16000000 = 0.00000625s (it takes this time to do a cycle)
// - at prescaler 8 : (100 * 8) / 16000000 = 0.00005s
// - at prescaler 64 : (100 * 64) / 16000000 = 0.0004s
// - at prescaler 256 : (100 * 256) / 16000000 = 0.0016s
// - at prescaler 1024 : (100 * 1024) / 16000000 = 0.0064s
// if choose top value of 1000 :
// - at prescaler 1 : 1000 / 16000000 = 0.0000625s (it takes this time to do a cycle)
// - at prescaler 8 : (1000 * 8) / 16000000 = 0.0005s
// - at prescaler 64 : (1000 * 64) / 16000000 = 0.004s
// - at prescaler 256 : (1000 * 256) / 16000000 = 0.016s
// - at prescaler 1024 : (1000 * 1024) / 16000000 = 0.064s
// 16.9.3 : timer1 fast PWM
#define LED1_PWM_PRESCALER 8 // can be 1, 8, 64, 256, 1024
#define LED1_PWM_PRESCALER 256 // can be 1, 8, 64, 256, 1024
#define DUTY_CYCLE_PERCENT 9
#define FRQUENCY_MS 1
#define FREQUENCY_MS 1
#define TOP_VALUE 1000
volatile uint8_t duty_cycle = DUTY_CYCLE_PERCENT;
void blink_led_1() {
TCCR1A = (1 << WGM11); // Table 16-4 : set timer1 in fast PWM mode 14, with TOP ICR1, so we can use OCR1A for duty cycle and keep ICR1 for frequency
TCCR1B = (1 << WGM13) | (1 << WGM12); // mode 15 with OCR1A TOP prevent using duty cycle trigger on OC1A (OCR1B is free but triggers OC1B -> PB2)
// other fast PWM modes 5, 6, and 7 uses predefined TOP, preventing to define a multiple of 100 for percent accuracy
TCCR1A |= (1 << COM1A1); // Table 16-2 : set non-inverting mode to trigger OC1A on fast PWM (14.3.1 : OC1A is alternate function of PB1)
TCCR1B |= PRESCALE_SET(LED1_PWM_PRESCALER); // Table 16-5 : set the appropriate prescale values
// ICR1 = TIME_MS(FREQUENCY_MS, LED1_PWM_PRESCALER); // top value for Xms
ICR1 = TOP_VALUE;
OCR1A = PERCENT(duty_cycle, ICR1); // 16.9.3 : duty cycle
}
vary_duty() {
// TCCR0A = (1 << WGM11); // Table 15-8 : set timer0 in CTC mode, with TOP OCRA
// TCCR1B = (1 << WGM13) | (1 << WGM12);
// TCCR1A |= (1 << COM1A1); // Table 16-2 : set non-inverting mode to trigger OC1A on fast PWM (14.3.1 : OC1A is alternate function of PB1)
// TCCR1B |= PRESCALE_SET(LED1_PWM_PRESCALER); // Table 16-5 : set the appropriate prescale values
// // ICR1 = TIME_MS(FREQUENCY_MS, LED1_PWM_PRESCALER); // top value for Xms
// ICR1 = TOP_VALUE;
// OCR1A = PERCENT(duty_cycle, ICR1); // 16.9.3 : duty cycle
}
// 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
@@ -40,19 +91,15 @@ int main() {
CLEAR_ELEM(LED1);
MODE_OUTPUT(LED2);
CLEAR_ELEM(LED2);
MODE_OUTPUT(LED3);
CLEAR_ELEM(LED3);
MODE_OUTPUT(LED4);
CLEAR_ELEM(LED4);
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
blink_led_1();
vary_duty();
while (1);
}