From 1d25e73e3d6d789b52433afee4ab3a1f70019912 Mon Sep 17 00:00:00 2001
From: realraum <realraum@realraum.at>
Date: Mon, 12 Dec 2011 22:34:01 +0000
Subject: [PATCH] first working timer interupt for rf433rcv

---
 rf433rcv/teensy/Makefile     |    2 +-
 rf433rcv/teensy/example.c    |   94 ++++++++++++++----------------------------
 rf433rcv/teensy/usb_rawhid.c |    4 +-
 3 files changed, 35 insertions(+), 65 deletions(-)

diff --git a/rf433rcv/teensy/Makefile b/rf433rcv/teensy/Makefile
index edf9f8a..8bd5973 100644
--- a/rf433rcv/teensy/Makefile
+++ b/rf433rcv/teensy/Makefile
@@ -444,7 +444,7 @@ gccversion :
 
 # Program the device.  
 program: $(TARGET).hex $(TARGET).eep
-	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+	~/teensy_loader_cli/teensy_loader_cli -mmcu=atmega32u4 -w $(TARGET).hex
 
 
 # Generate avr-gdb config/init file which does the following:
diff --git a/rf433rcv/teensy/example.c b/rf433rcv/teensy/example.c
index 635b16f..649b207 100644
--- a/rf433rcv/teensy/example.c
+++ b/rf433rcv/teensy/example.c
@@ -26,83 +26,53 @@
 #include <avr/interrupt.h>
 #include <util/delay.h>
 #include "usb_rawhid.h"
-#include "analog.h"
 
 #define CPU_PRESCALE(n)	(CLKPR = 0x80, CLKPR = (n))
 
 volatile uint8_t do_output=0;
-uint8_t buffer[64];
+uint8_t read_buffer[64];
+uint8_t write_buffer[64];
 
 int main(void)
 {
-	int8_t r;
-	uint8_t i;
-	uint16_t val, count=0;
+  int8_t r;
+  uint8_t i;
+  uint16_t val, count=0;
 
-	// set for 16 MHz clock
-	CPU_PRESCALE(0);
+  // set for 16 MHz clock
+  CPU_PRESCALE(0);
+  DDRF|=3;
+  PORTF&=~1;
+  // Configure timer 0 to generate a timer overflow interrupt every
+  // 200*8 clock cycles, 100us
+  TCCR0A = 1<<WGM01;
+  TCCR0B = 1<<CS01;
+  OCR0A = 199;
+  TCNT0 = 0;
+  TIMSK0 = (1<<OCIE0A);
 
-	// 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.
-	usb_init();
-	while (!usb_configured()) /* wait */ ;
+  // 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.
+  usb_init();
+  while (!usb_configured()) /* wait */ ;
+  // Wait an extra second for the PC's operating system to load drivers
+  // and do whatever it does to actually be ready for input
+  _delay_ms(1000);
+  while (1) {
+    // if received data, do something with it
+    r = usb_rawhid_recv(read_buffer, 0);
+    if (r>0)
+      usb_rawhid_send(read_buffer, 50);
 
-	// Wait an extra second for the PC's operating system to load drivers
-	// and do whatever it does to actually be ready for input
-	_delay_ms(1000);
-
-        // Configure timer 0 to generate a timer overflow interrupt every
-        // 256*1024 clock cycles, or approx 61 Hz when using 16 MHz clock
-        TCCR0A = 0x00;
-        TCCR0B = 0x05;
-        TIMSK0 = (1<<TOIE0);
-
-	while (1) {
-		// if received data, do something with it
-		r = usb_rawhid_recv(buffer, 0);
-		if (r > 0) {
-			// output 4 bits to D0, D1, D2, D3 pins
-			DDRD = 0x0F;
-			PORTD = (PORTD & 0xF0) | (buffer[0] & 0x0F);
-			// ignore the other 63.5 bytes....
-		}
-		// if time to send output, transmit something interesting
-		if (do_output) {
-			do_output = 0;
-			// send a packet, first 2 bytes 0xABCD
-			buffer[0] = 0xAB;
-			buffer[1] = 0xCD;
- 			// put A/D measurements into next 24 bytes
-			for (i=0; i<12; i++) {
-				val = analogRead(i);
-				buffer[i * 2 + 2] = val >> 8;
-				buffer[i * 2 + 3] = val & 255;
-			}
-			// most of the packet filled with zero
-			for (i=26; i<62; i++) {
-				buffer[i] = 0;
-			}
-			// put a count in the last 2 bytes
-			buffer[62] = count >> 8;
-			buffer[63] = count & 255;
-			// send the packet
-			usb_rawhid_send(buffer, 50);
-			count++;
-		}
-	}
+  }
 }
 
 // This interrupt routine is run approx 61 times per second.
-ISR(TIMER0_OVF_vect)
+ISR(TIMER0_COMPA_vect)
 {
-	static uint8_t count=0;
+  PORTF^=2;
 
-	// set the do_output variable every 2 seconds
-	if (++count > 122) {
-		count = 0;
-		do_output = 1;
-	}
 }
 
 
diff --git a/rf433rcv/teensy/usb_rawhid.c b/rf433rcv/teensy/usb_rawhid.c
index dae1214..036fbd7 100644
--- a/rf433rcv/teensy/usb_rawhid.c
+++ b/rf433rcv/teensy/usb_rawhid.c
@@ -34,8 +34,8 @@
  **************************************************************************/
 
 // You can change these to give your code its own name.
-#define STR_MANUFACTURER	L"MfgName"
-#define STR_PRODUCT		L"Teensy Raw HID Example"
+#define STR_MANUFACTURER	L"realraum"
+#define STR_PRODUCT		L"rf433rxtx"
 
 // These 4 numbers identify your device.  Set these to
 // something that is (hopefully) not used by any others!
-- 
1.7.10.4