macros with elements
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hugo LAMY
@@ -1,75 +1,114 @@
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// #include <avr/io.h>
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// // #define FIRST_LETTER_IMPL(x) #x[0]
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// // #define FIRST_LETTER(x) FIRST_LETTER_IMPL(x)
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// // #define PORT_LETTER(PIN) FIRST_LETTER(PIN)
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// // global registers
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// #define SET(register, bit) register |= 1 << bit
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// #define CLEAR(register, bit) register &= ~(1 << bit)
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// #define TEST(register, bit) register & 1 << bit
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// #define TOGGLE(register, bit) register ^= 1 << bit
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// // actions on ports
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// #define TEST_PIN(port, bit) TEST(PIN ## port, bit)
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// #define TOGGLE_PIN(port, bit) SET(PIN ## port, bit)
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// #define MODE_INPUT(port, bit) CLEAR(DDR ## port, bit)
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// #define MODE_OUTPUT(port, bit) SET(DDR ## port, bit)
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// #define IS_PIN_SET(port, bit) (TEST_PIN(port, bit)) == 0
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// #define IS_PIN_CLEAR(port, bit) (TEST_PIN(port, bit)) == 1
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// #define TURN_ON(_PORT, BIT) SET(PORT ## _PORT, BIT)
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// #define TURN_OFF(_PORT, BIT) CLEAR(PORT ## _PORT, BIT)
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// // LEDs
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// #define TURN_ON_LED(bit) SET(PORTB, bit)
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// #define TURN_OFF_LED(bit) CLEAR(PORTB, bit)
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// #define TOGGLE_LED(led) TOGGLE_PIN(B, led)
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// // ELEMENTS
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// #define D1 0
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// #define D2 1
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// #define D3 2
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// #define D4 4
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// #define SW1 2
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// #define SW2 4
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// // TIME
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// #define PRESCALE_VALUE 1024
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// #if (PRESCALE_VALUE == 1)
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// #define PRESCALE_SET (1 << CS10)
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// #elif (PRESCALE_VALUE == 8)
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// #define PRESCALE_SET (1 << CS11)
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// #elif (PRESCALE_VALUE == 64)
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// #define PRESCALE_SET (1 << CS10) | (1 << CS11)
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// #elif (PRESCALE_VALUE == 256)
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// #define PRESCALE_SET (1 << CS12)
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// #elif (PRESCALE_VALUE == 1024)
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// #define PRESCALE_SET (1 << CS10) | (1 << CS12)
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// #endif
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// #define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
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// int main() {
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// MODE_OUTPUT(B, D2);
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// TURN_ON(B, D2);
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// }
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//////////////////////////////////////////////
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#include <stdio.h>
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#include <avr/io.h>
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// #define FIRST_LETTER_IMPL(x) #x[0]
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// #define FIRST_LETTER(x) FIRST_LETTER_IMPL(x)
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// #define PORT_LETTER(PIN) FIRST_LETTER(PIN)
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// stringify
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#define STRINGIFY_HELPER(x) #x
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#define STRINGIFY(x) STRINGIFY_HELPER(x)
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// global registers
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// concatenate
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#define CONCAT_HELPER(x, y) x ## y
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#define CONCAT(x, y) CONCAT_HELPER(x, y)
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// get argument
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#define ARG_1(v1, v2) v1
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#define ARG_2(v1, v2) v2
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#define GET_PORT(args) ARG_1 args
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#define GET_BIT(args) ARG_2 args
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// actions on registers
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#define SET(register, bit) register |= 1 << bit
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#define CLEAR(register, bit) register &= ~(1 << bit)
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#define TEST(register, bit) register & 1 << bit
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#define TOGGLE(register, bit) register ^= 1 << bit
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// actions on ports
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#define TEST_PIN(port, bit) TEST(PIN ## port, bit)
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#define TOGGLE_PIN(port, bit) SET(PIN ## port, bit)
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#define MODE_INPUT(port, bit) CLEAR(DDR ## port, bit)
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#define MODE_OUTPUT(port, bit) SET(DDR ## port, bit)
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#define IS_PIN_SET(port, bit) (TEST_PIN(port, bit)) == 0
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#define IS_PIN_CLEAR(port, bit) (TEST_PIN(port, bit)) == 1
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#define TURN_ON(_PORT, BIT) SET(PORT ## _PORT, BIT)
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#define TURN_OFF(_PORT, BIT) CLEAR(PORT ## _PORT, BIT)
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// LEDs
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#define TURN_ON_LED(bit) SET(PORTB, bit)
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#define TURN_OFF_LED(bit) CLEAR(PORTB, bit)
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#define TOGGLE_LED(led) TOGGLE_PIN(B, led)
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// ELEMENTS
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#define D1 0
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#define D2 1
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#define D3 2
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#define D4 4
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#define SW1 2
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#define SW2 4
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// TIME
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#define PRESCALE_VALUE 1024
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#if (PRESCALE_VALUE == 1)
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#define PRESCALE_SET (1 << CS10)
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#elif (PRESCALE_VALUE == 8)
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#define PRESCALE_SET (1 << CS11)
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#elif (PRESCALE_VALUE == 64)
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#define PRESCALE_SET (1 << CS10) | (1 << CS11)
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#elif (PRESCALE_VALUE == 256)
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#define PRESCALE_SET (1 << CS12)
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#elif (PRESCALE_VALUE == 1024)
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#define PRESCALE_SET (1 << CS10) | (1 << CS12)
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#endif
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#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
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int main() {
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MODE_OUTPUT(B, D2);
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TCCR1B |= (1 << WGM12); // set timer in CTC (Clear Time on Compare) mode
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// -> Table 16-4 : use bit WGM12 to set mode ctc
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// -> 16.11.2 : bit WGM12 is located in register TCCR1B
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TCCR1A |= (1 << COM1A0 ) ; // Enable timer 1 Compare Output channel A in toggle mode
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// -> Table 14-3 : alternate functions for PORTB1 is OC1A (Timer/Counter1 Output Compare Match A Output)
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// -> 14.3.1 : OC1A/PCINT1 – Port B, Bit 1
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OCR1A = TIME_MS(500); // set CTC compare value
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// -> Table 16-4 : the value to reset the timer is the Output Compare Registers OCR1A
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TCCR1B |= (PRESCALE_SET);
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while(1) {
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continue;
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}
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}
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// actions on elements
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#define SET_ELEM(elem) SET(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define CLEAR_ELEM(elem) CLEAR(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define TEST_ELEM(elem) TEST(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define TOGGLE_ELEM(elem) TOGGLE(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define MODE_OUTPUT(elem) SET(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
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#define MODE_INPUT(elem) CLEAR(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
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#define TOGGLE_PIN(elem) SET(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem))
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#define TEST_PIN(elem) (TEST(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem)))
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// bits
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#define D1 0
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#define D2 1
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#define D3 2
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#define D4 4
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#define SW1 2
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#define SW2 4
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// elements (port, bit)
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#define LED1 (B, D1)
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#define LED2 (B, D2)
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#define LED3 (B, D3)
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#define LED4 (B, D4)
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#define BUTTON1 (D, SW1)
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#define BUTTON2 (D, SW2)
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int main()
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{
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MODE_OUTPUT(LED1);
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SET_ELEM(LED1);
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return 0;
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}
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