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diff --git a/software/cmx589a_teensy_test/cmx589a.c b/software/cmx589a_teensy_test/cmx589a.c
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+++ b/software/cmx589a_teensy_test/cmx589a.c
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+/* Simple example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2008 PJRC.COM, LLC
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <stdint.h>
+#include <util/delay.h>
+#include "usb_serial.h"
+#include "uart.h"
+
+#define LED_CONFIG	(DDRD |= (1<<6))
+#define LED_ON		(PORTD |= (1<<6))
+#define LED_OFF		(PORTD &= ~(1<<6))
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+
+#define INT1_SET_INPUT	(DDRD |= (1<<1))
+#define PB3_SET_OUTPUT	(DDRB &= ~ (1<<3))
+#define PB7_SET_OUTPUT	(DDRB &= ~(1<<7))
+
+#define PB3_TX_ENABLE		(PORTB |= (1<<3))
+#define PB3_TX_DISABLE		(PORTB &= ~(1<<3))
+
+#define ExtInt1On   EIMSK |= 1 << INT1
+#define ExtInt1Config   EICRA  |= (1 << ISC10 ) |  ( 1 << ISC11)
+
+#define UART_SET_DEFAULT      UCSR1C = 0
+#define UART_SET_8BIT      UCSR1C |= (1 << UMSEL10) | (1 << UCSZ10) | (1 << UCSZ11) 
+#define UART_SET_EXT_CLK  XCK1_DDR &= ~(1<<XCK1)
+
+
+
+
+//#define INIT_COUNTER_0  TCNT0 = 0
+//#define SET_CTC_MODE    WGM &= !7; WGM |= 2
+//#define SET_EXT_FREQ_5_3_MHZ    OCR0A = 3
+
+
+unsigned int snr_rsii_counter = 0;
+ISR(INT1_vect)
+{
+  snr_rsii_counter++;
+  
+  return 0;
+}
+
+#define BAUD_RATE 9600
+
+// write a string to the uart
+#define uart_print(s) uart_print_P(PSTR(s))
+void uart_print_P(const char *str)
+{
+	char c;
+	while (1) {
+		c = pgm_read_byte(str++);
+		if (!c) break;
+		uart_putchar(c);
+	}
+}
+
+void send_str(const char *s);
+uint8_t recv_str(char *buf, uint8_t size);
+void parse_and_execute_command(const char *buf, uint8_t num);
+
+// Basic command interpreter for controlling port pins
+int main(void)
+{
+	char buf[32];
+	uint8_t n, c;
+
+	// set for 16 MHz clock, and turn on the LED
+	CPU_PRESCALE(0);
+	LED_CONFIG;
+	LED_ON;
+
+    INT1_SET_INPUT;
+    ExtInt1On;
+    ExtInt1Config;
+  
+    PB3_SET_OUTPUT;
+    //PB3_TX_DISABLE;
+    PB3_TX_ENABLE;
+  
+  	usb_init();
+	uart_init(BAUD_RATE);
+
+
+	while (1) {
+		if (uart_available()) {
+			c = uart_getchar();
+          
+		}
+        uart_print("TEST\r\n");
+	}
+    return 0;
+    
+    //END
+  
+    // initialize the USB, and then wait for the host
+	// to set configuration.  If the Teensy is powered
+	// without a PC connected to the USB port, this 
+	// will wait forever.
+	while (!usb_configured()) /* wait */ ;
+	_delay_ms(1000);
+
+	while (1) {
+		// wait for the user to run their terminal emulator program
+		// which sets DTR to indicate it is ready to receive.
+		while (!(usb_serial_get_control() & USB_SERIAL_DTR)) /* wait */ ;
+
+		// discard anything that was received prior.  Sometimes the
+		// operating system or other software will send a modem
+		// "AT command", which can still be buffered.
+		usb_serial_flush_input();
+
+		// print a nice welcome message
+		send_str(PSTR("\r\nTeensy USB Serial Example, "
+			"Simple Pin Control Shell\r\n\r\n"
+			"Example Commands\r\n"
+			"  B0?   Read Port B, pin 0\r\n"
+			"  C2=0  Write Port C, pin 1 LOW\r\n"
+			"  D6=1  Write Port D, pin 6 HIGH  (D6 is LED pin)\r\n\r\n"));
+
+		// and then listen for commands and process them
+		while (1) {
+			send_str(PSTR("> "));
+			n = recv_str(buf, sizeof(buf));
+			if (n == 255) break;
+			send_str(PSTR("\r\n"));
+			parse_and_execute_command(buf, n);
+		}
+	}
+}
+
+
+// Send a string to the USB serial port.  The string must be in
+// flash memory, using PSTR
+//
+void send_str(const char *s)
+{
+	char c;
+	while (1) {
+		c = pgm_read_byte(s++);
+		if (!c) break;
+		usb_serial_putchar(c);
+	}
+}
+
+// Receive a string from the USB serial port.  The string is stored
+// in the buffer and this function will not exceed the buffer size.
+// A carriage return or newline completes the string, and is not
+// stored into the buffer.
+// The return value is the number of characters received, or 255 if
+// the virtual serial connection was closed while waiting.
+//
+uint8_t recv_str(char *buf, uint8_t size)
+{
+	int16_t r;
+	uint8_t count=0;
+
+	while (count < size) {
+		r = usb_serial_getchar();
+		if (r != -1) {
+			if (r == '\r' || r == '\n') return count;
+			if (r >= ' ' && r <= '~') {
+				*buf++ = r;
+				usb_serial_putchar(r);
+				count++;
+			}
+		} else {
+			if (!usb_configured() ||
+			  !(usb_serial_get_control() & USB_SERIAL_DTR)) {
+				// user no longer connected
+				return 255;
+			}
+			// just a normal timeout, keep waiting
+		}
+	}
+	return count;
+}
+
+// parse a user command and execute it, or print an error message
+//
+void parse_and_execute_command(const char *buf, uint8_t num)
+{
+	uint8_t port, pin, val;
+
+	if (num < 3) {
+		send_str(PSTR("unrecognized format, 3 chars min req'd\r\n"));
+		return;
+	}
+	// first character is the port letter
+	if (buf[0] >= 'A' && buf[0] <= 'F') {
+		port = buf[0] - 'A';
+	} else if (buf[0] >= 'a' && buf[0] <= 'f') {
+		port = buf[0] - 'a';
+	} else {
+		send_str(PSTR("Unknown port \""));
+		usb_serial_putchar(buf[0]);
+		send_str(PSTR("\", must be A - F\r\n"));
+		return;
+	}
+	// second character is the pin number
+	if (buf[1] >= '0' && buf[1] <= '7') {
+		pin = buf[1] - '0';
+	} else {
+		send_str(PSTR("Unknown pin \""));
+		usb_serial_putchar(buf[0]);
+		send_str(PSTR("\", must be 0 to 7\r\n"));
+		return;
+	}
+	// if the third character is a question mark, read the pin
+	if (buf[2] == '?') {
+		// make the pin an input
+		*(uint8_t *)(0x21 + port * 3) &= ~(1 << pin);
+		// read the pin
+		val = *(uint8_t *)(0x20 + port * 3) & (1 << pin);
+		usb_serial_putchar(val ? '1' : '0');
+		send_str(PSTR("\r\n"));
+		return;
+	}
+	// if the third character is an equals sign, write the pin
+	if (num >= 4 && buf[2] == '=') {
+		if (buf[3] == '0') {
+			// make the pin an output
+			*(uint8_t *)(0x21 + port * 3) |= (1 << pin);
+			// drive it low
+			*(uint8_t *)(0x22 + port * 3) &= ~(1 << pin);
+			return;
+		} else if (buf[3] == '1') {
+			// make the pin an output
+			*(uint8_t *)(0x21 + port * 3) |= (1 << pin);
+			// drive it high
+			*(uint8_t *)(0x22 + port * 3) |= (1 << pin);
+			return;
+		} else {
+			send_str(PSTR("Unknown value \""));
+			usb_serial_putchar(buf[3]);
+			send_str(PSTR("\", must be 0 or 1\r\n"));
+			return;
+		}
+	}
+	// otherwise, error message
+	send_str(PSTR("Unknown command \""));
+	usb_serial_putchar(buf[0]);
+	send_str(PSTR("\", must be ? or =\r\n"));
+}
+