From 73d9ce77cff476d795d337c5a04d0969a8fe984b Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sat, 16 Feb 2013 20:15:49 +0000
Subject: added very basic pwm example

git-svn-id: https://svn.spreadspace.org/avr/trunk@189 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-pwm/usb-pwm.c | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 usb-pwm/usb-pwm.c

(limited to 'usb-pwm/usb-pwm.c')

diff --git a/usb-pwm/usb-pwm.c b/usb-pwm/usb-pwm.c
new file mode 100644
index 0000000..fd1e916
--- /dev/null
+++ b/usb-pwm/usb-pwm.c
@@ -0,0 +1,162 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils 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 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+
+#include "util.h"
+#include "led.h"
+
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2012.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+#include <LUFA/Drivers/USB/USB.h>
+#include "lufa-descriptor-usbserial.h"
+
+USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
+  {
+    .Config =
+      {
+        .ControlInterfaceNumber         = 0,
+
+        .DataINEndpointNumber           = CDC_TX_EPNUM,
+        .DataINEndpointSize             = CDC_TXRX_EPSIZE,
+        .DataINEndpointDoubleBank       = false,
+
+        .DataOUTEndpointNumber          = CDC_RX_EPNUM,
+        .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
+        .DataOUTEndpointDoubleBank      = false,
+
+        .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
+        .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
+        .NotificationEndpointDoubleBank = false,
+      },
+  };
+
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+  CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
+}
+
+void EVENT_USB_Device_ControlRequest(void)
+{
+  CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
+}
+/* end LUFA CDC-ACM specific definitions*/
+
+#define PWM_VAL OCR1BL
+
+void pwm_init(void)
+{
+  DDRB |= (1<<PB6);
+  TCCR1B = 0;
+  TCNT1 = 0;
+  OCR1B = 0;
+  TCCR1A = (1<<COM1B1) | (1<<WGM10);
+  TCCR1B = (1<<WGM12);
+}
+
+inline void pwm_on(void)
+{
+  TCCR1B = (TCCR1B & 0xF8) | (1<<CS10);
+}
+
+inline void pwm_off(void)
+{
+  TCCR1B = (TCCR1B & 0xF8);
+  TCNT1 = 0;
+}
+
+inline void pwm_set(uint8_t val)
+{
+  PWM_VAL = val;
+}
+
+inline void pwm_inc(void)
+{
+  if(PWM_VAL < 255)
+    PWM_VAL++;
+}
+
+inline void pwm_dec(void)
+{
+  if(PWM_VAL > 0)
+    PWM_VAL--;
+}
+
+
+FILE usb_stream;
+
+void stdio_init(void)
+{
+  CDC_Device_CreateStream(&VirtualSerial_CDC_Interface,&usb_stream);
+  stdin = &usb_stream;
+  stdout = &usb_stream;
+  stderr = &usb_stream;
+}
+
+void handle_cmd(uint8_t cmd)
+{
+  switch(cmd) {
+  case '0': pwm_off(); led_off(); printf("ok\r\n"); break;
+  case '1': pwm_on(); led_on(); printf("ok\r\n"); break;
+  case '+': pwm_inc(); printf("pwm = %d\r\n", PWM_VAL);  break;
+  case '-': pwm_dec(); printf("pwm = %d\r\n", PWM_VAL); break;
+  case 'r': reset2bootloader(); break;
+  default: printf("error\r\n"); return;
+  }
+
+}
+
+int main(void)
+{
+  MCUSR &= ~(1 << WDRF);
+  wdt_disable();
+
+  cpu_init();
+  led_init();
+  USB_Init();
+  stdio_init();
+  pwm_init();
+  sei();
+
+  for(;;) {
+    int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
+    while(BytesReceived > 0) {
+      int ReceivedByte = fgetc(stdin);
+      if(ReceivedByte != EOF) {
+        handle_cmd(ReceivedByte);
+      }
+      BytesReceived--;
+    }
+
+    CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
+    USB_USBTask();
+  }
+}
-- 
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