Update copyright year to 2013.

[pub/USBasp.git] / Projects / AVRISP-MKII / Lib / XPROG / XPROGTarget.c

diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
index 28cb6ab..5f48089 100644 (file)
--- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
+++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2010.
+     Copyright (C) Dean Camera, 2013.
 
   dean [at] fourwalledcubicle [dot] com
-      www.fourwalledcubicle.com
+           www.lufa-lib.org
 */
 
 /*
-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2013  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -18,7 +18,7 @@
   advertising or publicity pertaining to distribution of the
   software without specific, written prior permission.
 
-  The author disclaim all warranties with regard to this
+  The author disclaims all warranties with regard to this
   software, including all implied warranties of merchantability
   and fitness.  In no event shall the author be liable for any
   special, indirect or consequential damages or any damages
@@ -39,7 +39,7 @@
 #if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__)
 
 /** Flag to indicate if the USART is currently in Tx or Rx mode. */
-volatile bool IsSending;
+bool IsSending;
 
 /** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
 void XPROGTarget_EnableTargetPDI(void)
@@ -55,13 +55,13 @@ void XPROGTarget_EnableTargetPDI(void)
        _delay_us(1);
 
        /* Set up the synchronous USART for XMEGA communications - 8 data bits, even parity, 2 stop bits */
-       UBRR1  = (F_CPU / XPROG_HARDWARE_SPEED);
+       UBRR1  = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
        UCSR1B = (1 << TXEN1);
        UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
 
-       /* Send two BREAKs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
-       XPROGTarget_SendBreak();
-       XPROGTarget_SendBreak();
+       /* Send two IDLEs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
+       XPROGTarget_SendIdle();
+       XPROGTarget_SendIdle();
 }
 
 /** Enables the target's TPI interface, holding the target in reset until TPI mode is exited. */
@@ -78,21 +78,22 @@ void XPROGTarget_EnableTargetTPI(void)
        DDRD |=  (1 << 5) | (1 << 3);
        DDRD &= ~(1 << 2);
 
-       /* Set up the synchronous USART for TINY communications - 8 data bits, even parity, 2 stop bits */
-       UBRR1  = (F_CPU / XPROG_HARDWARE_SPEED);
+       /* Set up the synchronous USART for TPI communications - 8 data bits, even parity, 2 stop bits */
+       UBRR1  = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
        UCSR1B = (1 << TXEN1);
        UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
 
-       /* Send two BREAKs of 12 bits each to enable TPI interface (need at least 16 idle bits) */
-       XPROGTarget_SendBreak();
-       XPROGTarget_SendBreak();
+       /* Send two IDLEs of 12 bits each to enable TPI interface (need at least 16 idle bits) */
+       XPROGTarget_SendIdle();
+       XPROGTarget_SendIdle();
 }
 
 /** Disables the target's PDI interface, exits programming mode and starts the target's application. */
 void XPROGTarget_DisableTargetPDI(void)
 {
        /* Switch to Rx mode to ensure that all pending transmissions are complete */
-       XPROGTarget_SetRxMode();
+       if (IsSending)
+         XPROGTarget_SetRxMode();
 
        /* Turn off receiver and transmitter of the USART, clear settings */
        UCSR1A  = ((1 << TXC1) | (1 << RXC1));
@@ -108,14 +109,15 @@ void XPROGTarget_DisableTargetPDI(void)
 void XPROGTarget_DisableTargetTPI(void)
 {
        /* Switch to Rx mode to ensure that all pending transmissions are complete */
-       XPROGTarget_SetRxMode();
+       if (IsSending)
+         XPROGTarget_SetRxMode();
 
        /* Turn off receiver and transmitter of the USART, clear settings */
        UCSR1A |= (1 << TXC1) | (1 << RXC1);
        UCSR1B  = 0;
        UCSR1C  = 0;
 
-       /* Set all USART lines as input, tristate */
+       /* Set all USART lines as inputs, tristate */
        DDRD  &= ~((1 << 5) | (1 << 3));
        PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
 
@@ -140,7 +142,7 @@ void XPROGTarget_SendByte(const uint8_t Byte)
        UDR1    = Byte;
 }
 
-/** Receives a byte via the software USART, blocking until data is received.
+/** Receives a byte via the hardware USART, blocking until data is received or timeout expired.
  *
  *  \return Received byte from the USART
  */
@@ -156,19 +158,20 @@ uint8_t XPROGTarget_ReceiveByte(void)
        return UDR1;
 }
 
-/** Sends a BREAK via the USART to the attached target, consisting of a full frame of idle bits. */
-void XPROGTarget_SendBreak(void)
+/** Sends an IDLE via the USART to the attached target, consisting of a full frame of idle bits. */
+void XPROGTarget_SendIdle(void)
 {
        /* Switch to Tx mode if currently in Rx mode */
        if (!(IsSending))
          XPROGTarget_SetTxMode();
 
-       /* Need to do nothing for a full frame to send a BREAK */
+       /* Need to do nothing for a full frame to send an IDLE */
        for (uint8_t i = 0; i < BITS_IN_USART_FRAME; i++)
        {
                /* Wait for a full cycle of the clock */
                while (PIND & (1 << 5));
                while (!(PIND & (1 << 5)));
+               while (PIND & (1 << 5));
        }
 }
 
@@ -177,6 +180,7 @@ static void XPROGTarget_SetTxMode(void)
        /* Wait for a full cycle of the clock */
        while (PIND & (1 << 5));
        while (!(PIND & (1 << 5)));
+       while (PIND & (1 << 5));
 
        PORTD  |=  (1 << 3);
        DDRD   |=  (1 << 3);