3 files changed, 291 insertions, 0 deletions
diff --git a/ezdop/src/firmware/Makefile.am b/ezdop/src/firmware/Makefile.am
new file mode 100644
index 0000000000..6cb674811a
--- /dev/null
+++ b/ezdop/src/firmware/Makefile.am
@@ -0,0 +1,60 @@
+# Copyright 2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+include $(top_srcdir)/Makefile.common
+
+datadir = $(prefix)/share/ezdop
+
+# Use avr-gcc versions of compiler and binutils
+CC=$(AVRGCC)
+OBJCOPY=$(AVROBJCOPY)
+
+# What's defined for rest of project not good for avr-gcc (no -pthread for instance)
+override CFLAGS=
+
+noinst_PROGRAMS = \
+    dopctrl.elf \
+    dopctrl.hex  
+      
+EXTRA_DIST = \
+    dopctrl.hex
+
+dopctrl_elf_CFLAGS=-mmcu=atmega8 -funsigned-char -funsigned-bitfields \
+                   -fpack-struct -fshort-enums -Wall -Wstrict-prototypes \
+                   -Wa,-adhlns=$(<:.c=.lst)
+
+dopctrl_elf_SOURCES = \
+    dopctrl.c
+    
+#dopctrl_elfdir = $(includedir)
+
+include_HEADERS = \
+    dopctrl.h
+
+%.hex: %.elf
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+dopctrl.hex : dopctrl.elf
+
+install-data-local:
+	$(INSTALL_DATA) -D $(top_builddir)/ezdop/src/firmware/dopctrl.hex $(DESTDIR)$(datadir)/dopctrl.hex
+
+uninstall-local:
+	$(RM) $(DESTDIR)$(datadir)/dopctrl.hex
+    
+\ No newline at end of file
diff --git a/ezdop/src/firmware/dopctrl.c b/ezdop/src/firmware/dopctrl.c
new file mode 100644
index 0000000000..f499d6c359
--- /dev/null
+++ b/ezdop/src/firmware/dopctrl.c
@@ -0,0 +1,193 @@
+/*
+ * AE6HO EZ-Doppler firmware for onboard ATmega8 microcontroller
+ * Copyright 2006 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * ARCHITECTURE
+ * 
+ * Timer0 is 8000 Hz time base
+ * PORTD.2 through PORTD.5 are doppler antenna array element enables.
+ * PORTB.0 is a diagnostic LED, set low to light up
+ * ADC7 is audio input
+ * ADC6 is RSSI input - not yet used
+ *
+ */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/signal.h>
+#include "dopctrl.h"
+
+#define LED 0
+#define turn_off_led() 	PORTB |= _BV(LED);
+#define turn_on_led()	PORTB &= ~_BV(LED);
+
+#define ANT1 _BV(2)
+#define ANT2 _BV(3)
+#define ANT3 _BV(4)
+#define ANT4 _BV(5)
+#define ANTMASK ANT1|ANT2|ANT3|ANT4
+
+#define ADCAIN 7
+#define BAUDRATE 250000
+
+/* Assume these are all set to zero in startup code */
+
+uint8_t rotate;         /* Flag to indicate antennas should rotate or not */
+uint8_t streaming;      /* Flag to indicate continuous sampling */
+uint8_t antennas;       /* Holds shadow copy of PORTD antennas */
+uint8_t speed;          /* Holds samples per phase increment */
+uint8_t phase;          /* Holds rotation phase (measured in samples */
+
+uint8_t audio_hi;       /* High byte of ADC sample of audio */
+uint8_t audio_lo;       /* Low byte of ADC sample of audio */
+
+uint8_t rx;             /* Temporary holds received byte from USART */
+uint8_t command;        /* Temporary to hold command when getting operand */
+uint8_t cmdbyte;        /* Tracks bytes received in multi-byte commands */
+
+int main(void)
+{
+	/* Diagnostic port setup */
+	DDRB = _BV(LED);						/* PB0 is output */
+	turn_off_led();
+	
+	/* Antenna control port setup */
+	speed = 4;							/* Todo: read from EEPROM */
+	antennas = ANT1;					/* Start with antenna #1 */
+	PORTD = antennas;					/* Set port value */
+	DDRD = ANTMASK;						/* Set antenna enables as PORTD outputs */
+	
+	/* ADC port setup */
+	ADMUX = _BV(REFS0)|ADCAIN;			/* AVCC is reference, use ADC for audio input (ADC7) */
+	ADCSRA = _BV(ADEN)|_BV(ADIE)|0x07; /* Enable converter, prescale by 128, enable ADC interrupt */
+	
+	/* USART port setup*/
+	UCSRA = 0;							/* Normal asynchronous mode */
+	UCSRB = _BV(TXEN)|_BV(RXEN)|_BV(RXCIE); /* Enable transmitter and receiver, and receiver interrupts */
+	UCSRC = _BV(URSEL)|_BV(UCSZ1)|_BV(UCSZ0); /* 8N1 format */
+	UBRRH = 0;							/* Set baud rate prescaler to 3 */
+	UBRRL = 3;							/* To get 250000 bps */
+	
+	/* Set up 8000 Hz time base */
+	timer_enable_int(_BV(TOIE0));		/* Turn on Timer0 output overflow interrupt */
+	TCCR0 = _BV(CS01);					/* Clock Timer0 from CLK/8 */
+	
+	sei();								/* Let 'er rip! */
+	return 0;
+}
+
+/* Timer0 overflow interrupt handler
+ *
+ * Creates 8000 Hz time base, or 125us budget
+ *
+ */
+SIGNAL(SIG_OVERFLOW0)
+{
+	/* Reload Timer0 samples to 8, results in 8000 Hz overflow interrupt */
+	TCNT0 = 0x08;
+
+	if (streaming) {
+		/* Kick-off an audio sample conversion, will interrupt 104us later */
+		ADCSRA |= _BV(ADSC);
+
+		/* Write the first byte of previous sample and enable UDRIE */
+		UDR = audio_lo;
+		UCSRB |= _BV(UDRIE);
+	}
+
+	if (!rotate)	/* Skip rotating antenna if not started */
+		return;
+
+	/* Increment antenna phase and see if antenna need to be rotated */
+    if (++phase == speed) {
+		phase = 0;
+		
+		/* Sequence antenna array elements */
+		antennas >>= 1;
+		antennas &= ANTMASK;
+
+		if (!antennas)
+			antennas = ANT4;
+		PORTD = antennas;
+	}
+}
+
+/* ADC conversion complete interrupt handler
+ *
+ * Read value and store. Assume prior sample has been handled.
+ *
+ */
+SIGNAL(SIG_ADC)
+{
+	audio_lo = ADCL;
+	audio_hi = ADCH;
+}
+
+/* USART data transmit holding register empty interrupt handler
+ * 
+ * First byte is always sent from timer interrupt
+ * So second byte gets sent here with UDRIE disabled
+ *
+ */
+SIGNAL(SIG_UART_DATA)
+{
+	/* Write second byte of previous sample and disable UDRIE */
+	UDR = audio_hi | (antennas << 2);
+	UCSRB &= ~_BV(UDRIE);
+}
+
+/* USART receive complete interrupt handler
+ *
+ * Received bytes are commands, with one or two bytes of operands following
+ *
+ */
+SIGNAL(SIG_UART_RECV)
+{
+	rx = UDR;
+
+	if (cmdbyte == 0) {
+		if (rx == EZDOP_CMD_ROTATE)		/* Start rotation */
+			rotate = 1;
+		else if (rx == EZDOP_CMD_STOP)       /* Stop rotation */
+			rotate = 0;
+        else if (rx == EZDOP_CMD_RATE) {     /* Set rotation rate */
+            command = rx;
+            cmdbyte = 1;
+        }
+        else if (rx == EZDOP_CMD_STREAM)     /* Stream audio samples */
+            streaming = 1;
+        else if (rx == EZDOP_CMD_STROFF)     /* Stop streaming */
+            streaming = 0;
+		else
+			turn_on_led();				/* Unknown command */
+	}
+	else if (cmdbyte == 1) {
+        if (command == EZDOP_CMD_RATE) {     /* Operand is number of samples per phase increment */
+            speed = rx;
+            cmdbyte = 0;
+        }
+		else
+			turn_on_led();				/* Bogus command state */
+	}
+	else
+		turn_on_led();					/* Bogus command state */
+}
diff --git a/ezdop/src/firmware/dopctrl.h b/ezdop/src/firmware/dopctrl.h
new file mode 100644
index 0000000000..b689990dc5
--- /dev/null
+++ b/ezdop/src/firmware/dopctrl.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2006 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+// Opcodes for commands to AVR
+#define EZDOP_CMD_ROTATE  0x00    /* No operand */
+#define EZDOP_CMD_STOP    0x01    /* No operand */
+#define EZDOP_CMD_RATE    0x02    /* One byte operand */
+#define EZDOP_CMD_STREAM  0x03    /* No operand */
+#define EZDOP_CMD_STROFF  0x04    /* No operand */
+
+#define EZDOP_DEFAULT_RATE 4
+
+// TODO: Update with actual id's once established for product
+// These are for FTDI unprogrammed parts
+#define EZDOP_VENDORID  0x0403
+#define EZDOP_PRODUCTID 0x6001
+
+// These determine the FTDI bitbang settings
+#define EZDOP_BAUDRATE  250000     // Fixed in EZ Doppler hardware design
+#define EZDOP_BBDIR     0x16       // Bits 4=RESET 2=SCK 1=MOSI 0=MISO, MISO is input