215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Target-related functions for the PDI Protocol decoder.
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*/
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#define INCLUDE_FROM_XPROGTARGET_C
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#include "XPROGTarget.h"
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#if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__)
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/** Flag to indicate if the USART is currently in Tx or Rx mode. */
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static bool IsSending;
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/** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
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void XPROGTarget_EnableTargetPDI(void)
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{
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IsSending = false;
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/* Set Tx and XCK as outputs, Rx as input */
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DDRD |= (1 << 5) | (1 << 3);
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DDRD &= ~(1 << 2);
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/* Set Tx (PDI CLOCK) high, DATA line low for at least 90ns to disable /RESET functionality */
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PORTD |= (1 << 5);
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PORTD &= ~(1 << 3);
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_delay_us(100);
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/* Set DATA line high (enables PDI interface after 16 PDI CLK cycles) */
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PORTD |= (1 << 3);
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_delay_us(20);
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/* Set up the synchronous USART for XMEGA communications - 8 data bits, even parity, 2 stop bits */
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UBRR1 = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
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UCSR1B = (1 << TXEN1);
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UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
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/* Send two IDLEs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
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XPROGTarget_SendIdle();
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XPROGTarget_SendIdle();
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}
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/** Enables the target's TPI interface, holding the target in reset until TPI mode is exited. */
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void XPROGTarget_EnableTargetTPI(void)
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{
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IsSending = false;
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/* Set /RESET line low for at least 400ns to enable TPI functionality */
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AUX_LINE_DDR |= AUX_LINE_MASK;
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AUX_LINE_PORT &= ~AUX_LINE_MASK;
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_delay_us(100);
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/* Set Tx and XCK as outputs, Rx as input */
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DDRD |= (1 << 5) | (1 << 3);
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DDRD &= ~(1 << 2);
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/* Set up the synchronous USART for TPI communications - 8 data bits, even parity, 2 stop bits */
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UBRR1 = ((F_CPU / 2 / XPROG_HARDWARE_SPEED) - 1);
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UCSR1B = (1 << TXEN1);
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UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
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/* Send two IDLEs of 12 bits each to enable TPI interface (need at least 16 idle bits) */
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XPROGTarget_SendIdle();
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XPROGTarget_SendIdle();
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}
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/** Disables the target's PDI interface, exits programming mode and starts the target's application. */
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void XPROGTarget_DisableTargetPDI(void)
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{
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/* Switch to Rx mode to ensure that all pending transmissions are complete */
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if (IsSending)
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XPROGTarget_SetRxMode();
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/* Turn off receiver and transmitter of the USART, clear settings */
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UCSR1A = ((1 << TXC1) | (1 << RXC1));
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UCSR1B = 0;
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UCSR1C = 0;
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/* Tristate all pins */
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DDRD &= ~((1 << 5) | (1 << 3));
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PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
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}
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/** Disables the target's TPI interface, exits programming mode and starts the target's application. */
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void XPROGTarget_DisableTargetTPI(void)
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{
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/* Switch to Rx mode to ensure that all pending transmissions are complete */
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if (IsSending)
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XPROGTarget_SetRxMode();
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/* Turn off receiver and transmitter of the USART, clear settings */
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UCSR1A |= (1 << TXC1) | (1 << RXC1);
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UCSR1B = 0;
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UCSR1C = 0;
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/* Set all USART lines as inputs, tristate */
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DDRD &= ~((1 << 5) | (1 << 3));
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PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
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/* Tristate target /RESET line */
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AUX_LINE_DDR &= ~AUX_LINE_MASK;
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AUX_LINE_PORT &= ~AUX_LINE_MASK;
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}
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/** Sends a byte via the USART.
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*
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* \param[in] Byte Byte to send through the USART
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*/
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void XPROGTarget_SendByte(const uint8_t Byte)
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{
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/* Switch to Tx mode if currently in Rx mode */
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if (!(IsSending))
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XPROGTarget_SetTxMode();
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/* Wait until there is space in the hardware Tx buffer before writing */
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while (!(UCSR1A & (1 << UDRE1)));
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UCSR1A |= (1 << TXC1);
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UDR1 = Byte;
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}
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/** Receives a byte via the hardware USART, blocking until data is received or timeout expired.
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*
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* \return Received byte from the USART
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*/
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uint8_t XPROGTarget_ReceiveByte(void)
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{
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/* Switch to Rx mode if currently in Tx mode */
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if (IsSending)
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XPROGTarget_SetRxMode();
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/* Wait until a byte has been received before reading */
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while (!(UCSR1A & (1 << RXC1)) && TimeoutTicksRemaining);
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return UDR1;
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}
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/** Sends an IDLE via the USART to the attached target, consisting of a full frame of idle bits. */
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void XPROGTarget_SendIdle(void)
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{
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/* Switch to Tx mode if currently in Rx mode */
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if (!(IsSending))
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XPROGTarget_SetTxMode();
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/* Need to do nothing for a full frame to send an IDLE */
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for (uint8_t i = 0; i < BITS_IN_USART_FRAME; i++)
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{
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/* Wait for a full cycle of the clock */
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while (PIND & (1 << 5));
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while (!(PIND & (1 << 5)));
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while (PIND & (1 << 5));
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}
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}
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static void XPROGTarget_SetTxMode(void)
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{
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/* Wait for a full cycle of the clock */
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while (PIND & (1 << 5));
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while (!(PIND & (1 << 5)));
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while (PIND & (1 << 5));
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PORTD |= (1 << 3);
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DDRD |= (1 << 3);
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UCSR1B &= ~(1 << RXEN1);
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UCSR1B |= (1 << TXEN1);
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IsSending = true;
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}
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static void XPROGTarget_SetRxMode(void)
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{
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while (!(UCSR1A & (1 << TXC1)));
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UCSR1A |= (1 << TXC1);
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UCSR1B &= ~(1 << TXEN1);
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UCSR1B |= (1 << RXEN1);
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DDRD &= ~(1 << 3);
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PORTD &= ~(1 << 3);
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IsSending = false;
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}
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#endif
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