fix timer 3 unavailable on m324

use timer 0 (whith less precission)

Firmware/compile_flags.txt

@@ -0,0 +1,12 @@
+--target=avr
+-D
+__AVR_ATmega324PA__
+-D
+F_CPU=16000000UL
+-I
+/usr/lib/avr/include
+-I
+./include
+-I
+../../dmm-libs/include
+

Firmware/makefile

@@ -0,0 +1,59 @@
+TARGET  = main
+SRCS   := $(shell find ../../dmm-libs/src/ -name '*.c') $(shell find src/ -name '*.c')
+FILES   = $(SRCS:%.c=%) #main uart avrIOhelper/io-helper #uart#hier alle c-Datein reinschreiben, trennung durch "  " und ohne .c-Endung
+MCU     = atmega324pa
+PROGC	= m324pa
+CC      = avr-gcc
+#TOOL    = stk500 -P /dev/ttyUSB0
+TOOL    = atmelice
+#TOOL    = avrispmkii
+#TOOL    = usbasp-clone
+
+BUILDDIR = Builds
+
+DEFINES = -DF_CPU=16000000UL -I include/ -I ../../dmm-libs/include/
+
+CFLAGS  =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections
+LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections
+
+LDFILES = $(foreach FILE,$(FILES),$(BUILDDIR)/$(FILE).o)
+
+all: clean $(BUILDDIR)/$(TARGET).elf
+
+$(BUILDDIR)/%.o: %.c
+	mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $(BUILDDIR)/$*.o
+
+$(BUILDDIR)/$(TARGET).elf: $(LDFILES)
+	mkdir -p $(dir $@)
+	$(CC) $(LDFLAGS) $(LDFILES) -o $(BUILDDIR)/$(TARGET).elf
+
+$(BUILDDIR)/$(TARGET).hex : $(BUILDDIR)/$(TARGET).elf
+	 avr-objcopy -j .data -j .text -O ihex $< $@
+
+fuse: 
+	avrdude -p $(PROGC) -c $(TOOL) -U lfuse:w:0xE8:m -U hfuse:w:0xD1:m
+
+load: $(BUILDDIR)/$(TARGET).hex
+	avrdude -p $(PROGC) -c $(TOOL) -U flash:w:$(BUILDDIR)/$(TARGET).hex -v -B 4MHz
+
+program: clean load
+
+reset:
+	avrdude -p $(PROGC) -c $(TOOL)
+	
+size: $(BUILDDIR)/$(TARGET).elf
+	avr-size -C --mcu=$(MCU) $(BUILDDIR)/$(TARGET).elf
+
+.PHONY=clean
+clean:
+	rm -rf $(BUILDDIR)
+
+
+#Fuse m1284p external Osz. Long startuptime
+#  avrdude -c usbasp-clone -p m1284p -U lfuse:w:0xff:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m
+
+#Fuse m1284p internal Osz. Long startuptime
+#  avrdude -c usbasp-clone -p m1284p -U lfuse:w:0xe2:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m
+
+

Firmware/src/music.c

@@ -80,28 +80,47 @@ void pwm_init (void)
 	TCCR1B = _BV(CS10) | _BV(WGM12); //fast PWM (8 bit), clk/1  source
 	
 	//setup sample timer (CTC Mode)	
+#if defined(__AVR_ATmega1284P__)
 	TCCR3A = 0; 
 	TCCR3B = _BV(CS30) | _BV(WGM32); // clk/1
+#elif defined(__AVR_ATmega324PA__)
+	TCCR0A = _BV(WGM01);
+	TCCR0B = _BV(CS01); // clk/8
+#endif
 }
 
 void pwm_deinit (void)
 {	
 	TCCR1A = 0;
 	TCCR1B = 0;	
+#if defined(__AVR_ATmega1284P__)
 	TCCR3A = 0;
 	TCCR3B = 0; 
+#elif defined(__AVR_ATmega324PA__)
+    TCCR0A = 0;
+    TCCR0B = 0;
+#endif
 }
 
 void pwm_gen(uint16_t tone, uint16_t periods)
 {
 	//calculate single sine sample duration
+#if defined(__AVR_ATmega1284P__)
 	OCR3A = F_CPU / tone / sizeof(sine_lookup) - 1;
+#elif defined(__AVR_ATmega324PA__)
+	OCR0A = F_CPU / 8 / tone / sizeof(sine_lookup) - 1;
+#endif
 
 	for (uint16_t period=0; period < periods; ++period)  {
 		for (uint8_t spl=0; spl < sizeof(sine_lookup); ++spl) {
 			//wait for timer ready for next spl
+#if defined(__AVR_ATmega1284P__)
 			loop_until_bit_is_set(TIFR3, OCF1A);	
 			TIFR3 = _BV(OCF1A); //clear OCF
+#elif defined(__AVR_ATmega324PA__)
+			loop_until_bit_is_set(TIFR0, OCF0A);
+			TIFR0 = _BV(OCF0A); //clear OCF
+#endif
 			
 			OCR1A = pgm_read_byte(sine_lookup + spl) + 0x70;
 		}