Add attempt to implement RC-5 sending

firmware/apps/rctest.c

@@ -0,0 +1,30 @@
+#include <pentabug/app.h>
+#include <pentabug/hal.h>
+#include <pentabug/rc5.h>
+
+static void run(void) {
+	if(button_clicked(LEFT)) {
+		led_on(RIGHT);
+
+		struct rc5_data data = { 0, 12 };
+
+		uint8_t i;
+		for(i = 0; i < 32; ++i) {
+			/*led_inv(LEFT);*/
+
+			data.addr = i;
+
+			uint8_t n;
+			for(n = 0; n < 128; ++n) {
+				data.code = n;
+				rc5_send(&data);
+
+				wait_ms(120);
+			}
+		}
+
+		led_off(RIGHT);
+	}
+}
+
+REG(run);

firmware/include/pentabug/hal.h

@@ -9,6 +9,8 @@
 #define OFF		0
 #define ON		1
 
+#define TICKS_PER_MS	38
+
 // INITIALIZATION
 
 // initializes the hardware (timers, ...)
@@ -68,4 +70,7 @@ uint8_t ir_recv(void);
 // WARNING: the time is actually measured in pentamilliseconds which are similar but not identical to regular milliseconds
 void wait_ms(uint16_t ms);
 
+// wait the given amount of ticks, see TICKS_PER_MS
+void wait_ticks(int16_t ticks);
+
 #endif /* HAL_H */

firmware/include/pentabug/rc5.h

@@ -0,0 +1,13 @@
+#ifndef RC5_H
+#define RC5_H 
+
+#include <stdint.h>
+
+struct rc5_data {
+	uint8_t addr;
+	uint8_t code;
+};
+
+void rc5_send(struct rc5_data *data);
+
+#endif /* RC5_H */

firmware/lib/hal.c

@@ -225,6 +225,14 @@ void wait_ms(uint16_t ms) {
 	}
 }
 
+void wait_ticks(int16_t ticks) {
+	wait_time = ticks;
+
+	while(wait_time > 0) {
+		test_stop_app();
+	}
+}
+
 void ir_on(void) {
 	ir_active = 1;
 }

firmware/lib/rc5.c

@@ -0,0 +1,51 @@
+#include <pentabug/rc5.h>
+
+#include <pentabug/hal.h>
+
+#define HALF_BIT_TICKS		34
+
+static uint8_t toggle = 0;
+
+static void send_bit(uint8_t bit) {
+	ir_set(!bit);
+	wait_ticks(HALF_BIT_TICKS);
+
+	ir_set(bit);
+	wait_ticks(HALF_BIT_TICKS);
+}
+
+static void send_byte_part(uint8_t byte, uint8_t length) {
+	int8_t i;
+
+	for(i = length - 1; i >= 0; --i) {
+		send_bit(byte & (1 << i));
+	}
+}
+
+void rc5_send(struct rc5_data *data) {
+	// start bit
+
+	send_bit(1);
+
+	// field bit
+
+	send_bit(!(data->code & (1 << 6)));
+
+	// control bit
+
+	send_bit(toggle);
+	toggle = !toggle;
+
+	// address
+
+	send_byte_part(data->addr, 5);
+
+	// command
+
+	send_byte_part(data->code, 6);
+
+	// done
+
+	ir_off();
+}
+