93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
#include <avr/io.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)
|
||
|
||
// get argument
|
||
#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
|
||
|
||
// actions 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
|
||
|
||
// actions on elements
|
||
#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)
|
||
|
||
// bits
|
||
#define D1 0
|
||
#define D2 1
|
||
#define D3 2
|
||
#define D4 4
|
||
#define SW1 2
|
||
#define SW2 4
|
||
|
||
// 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)
|
||
|
||
// TIME
|
||
#define PRESCALE_VALUE 1024
|
||
#if (PRESCALE_VALUE == 1)
|
||
#define PRESCALE_SET (1 << CS10)
|
||
#elif (PRESCALE_VALUE == 8)
|
||
#define PRESCALE_SET (1 << CS11)
|
||
#elif (PRESCALE_VALUE == 64)
|
||
#define PRESCALE_SET (1 << CS10) | (1 << CS11)
|
||
#elif (PRESCALE_VALUE == 256)
|
||
#define PRESCALE_SET (1 << CS12)
|
||
#elif (PRESCALE_VALUE == 1024)
|
||
#define PRESCALE_SET (1 << CS10) | (1 << CS12)
|
||
#endif
|
||
#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
|
||
|
||
// END MACROS
|
||
|
||
int main() {
|
||
MODE_OUTPUT(LED2);
|
||
|
||
TCCR1B |= (1 << WGM12); // set timer in CTC (Clear Time on Compare) mode
|
||
// -> Table 16-4 : use bit WGM12 to set mode ctc
|
||
// -> 16.11.2 : bit WGM12 is located in register TCCR1B
|
||
|
||
TCCR1A |= (1 << COM1A0 ) ; // Enable timer 1 Compare Output channel A in toggle mode
|
||
// -> Table 14-3 : alternate functions for PORTB1 is OC1A (Timer/Counter1 Output Compare Match A Output)
|
||
// -> 14.3.1 : OC1A/PCINT1 – Port B, Bit 1
|
||
|
||
OCR1A = TIME_MS(500); // set CTC compare value
|
||
// -> Table 16-4 : the value to reset the timer is the Output Compare Registers OCR1A
|
||
|
||
TCCR1B |= (PRESCALE_SET);
|
||
|
||
while(1) {
|
||
continue;
|
||
}
|
||
}
|
||
|
||
|
||
|
||
|
||
|