From 4e2b1ab16736c0a46295cb7f07b5cf69af3d4695 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 25 Jul 2013 21:52:33 +0000
Subject: usb-spi as programmer for spi based PIC bootloader

git-svn-id: https://svn.spreadspace.org/avr/trunk@208 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-spi/usb-spi.c | 54 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 44 insertions(+), 10 deletions(-)

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

diff --git a/usb-spi/usb-spi.c b/usb-spi/usb-spi.c
index d1dfa5c..7e68d7e 100644
--- a/usb-spi/usb-spi.c
+++ b/usb-spi/usb-spi.c
@@ -80,14 +80,18 @@ void EVENT_USB_Device_ControlRequest(void)
 {
   CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 }
-/* end LUFA CDC-ACM specific definitions*/
 
+/* end LUFA CDC-ACM specific definitions */
 
     /* Hardware Defines: */
 #define SPI_CS_DDR DDRB
 #define SPI_CS_PORT PORTB
 #define CS   0
 
+#define RESET_DDR DDRB
+#define RESET_PORT PORTB
+#define RESET   7
+
 void SetupHardware(void)
 {
   MCUSR &= ~(1 << WDRF);
@@ -99,24 +103,54 @@ void SetupHardware(void)
 
   TCCR0B = (1 << CS02);
 
-  SPI_Init(SPI_SPEED_FCPU_DIV_4  | SPI_MODE_MASTER | SPI_ORDER_MSB_FIRST | 
+  SPI_Init(SPI_SPEED_FCPU_DIV_4  | SPI_MODE_MASTER | SPI_ORDER_MSB_FIRST |
            SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING);
   SPI_CS_DDR |= (1<<CS);
   SPI_CS_PORT |= (1<<CS);
+
+  RESET_DDR |= (1<<RESET);
+  RESET_PORT |= (1<<RESET);
+
+/* INT0 as input with pull-up */
+  DDRD &= ~(1<<0);
+  PORTD |= (1<<0);
+  EICRA |= (1<<ISC01);
+  EIFR |= (1<<INTF0);
+  EIMSK |= (1<<INT0);
+}
+
+void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
+{
+  if(CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR)
+    RESET_PORT &= ~(1<<RESET);
+  else
+    RESET_PORT |= (1<<RESET);
 }
 
-void SPI_TransferBuffer(void)
+void EVENT_CDC_Device_BreakSent(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Duration)
+{
+  SPI_CS_PORT ^= (1<<CS);
+}
+
+ISR(INT0_vect)
+{
+  SPI_CS_PORT &= ~(1<<CS);
+  led_on();
+
+  uint8_t ReceivedByte = SPI_ReceiveByte();
+  RingBuffer_Insert(&SPItoUSB_Buffer, ReceivedByte);
+
+  led_off();
+  SPI_CS_PORT |= (1<<CS);
+}
+
+void SPI_SendBuffer(void)
 {
   SPI_CS_PORT &= ~(1<<CS);
   led_on();
 
   while(!(RingBuffer_IsEmpty(&USBtoSPI_Buffer))) {
-    uint8_t ReceivedByte = SPI_TransferByte(RingBuffer_Remove(&USBtoSPI_Buffer));
-    if (USB_DeviceState == DEVICE_STATE_Configured) {
-      RingBuffer_Insert(&SPItoUSB_Buffer, ReceivedByte);
-      if(RingBuffer_IsFull(&SPItoUSB_Buffer))
-        break;
-    }
+    SPI_SendByte(RingBuffer_Remove(&USBtoSPI_Buffer));
   }
 
   led_off();
@@ -157,7 +191,7 @@ int main(void)
     }
 
     if (!(RingBuffer_IsEmpty(&USBtoSPI_Buffer)))
-      SPI_TransferBuffer();
+      SPI_SendBuffer();
 
     CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
     USB_USBTask();
-- 
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