You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
328 lines
9.4 KiB
328 lines
9.4 KiB
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2009.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.fourwalledcubicle.com
|
|
*/
|
|
|
|
/*
|
|
Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, and distribute this software
|
|
and its documentation for any purpose and without fee is hereby
|
|
granted, provided that the above copyright notice appear in all
|
|
copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaim 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
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* Target-related functions for the PDI Protocol decoder.
|
|
*/
|
|
|
|
#define INCLUDE_FROM_PDITARGET_C
|
|
#include "PDITarget.h"
|
|
|
|
#if defined(ENABLE_PDI_PROTOCOL) || defined(__DOXYGEN__)
|
|
|
|
/** Flag to indicate if the USART is currently in Tx or Rx mode. */
|
|
volatile bool IsSending;
|
|
|
|
#if !defined(PDI_VIA_HARDWARE_USART)
|
|
/** Software USART raw frame bits for transmission/reception. */
|
|
volatile uint16_t SoftUSART_Data;
|
|
|
|
/** Bits remaining to be sent or received via the software USART - set as a GPIOR for speed. */
|
|
#define SoftUSART_BitCount GPIOR2
|
|
|
|
|
|
/** ISR to manage the software USART when bit-banged USART mode is selected. */
|
|
ISR(TIMER1_COMPA_vect, ISR_BLOCK)
|
|
{
|
|
/* Toggle CLOCK pin in a single cycle (see AVR datasheet) */
|
|
BITBANG_PDICLOCK_PIN |= BITBANG_PDICLOCK_MASK;
|
|
|
|
/* If not sending or receiving, just exit */
|
|
if (!(SoftUSART_BitCount))
|
|
return;
|
|
|
|
/* Check to see if we are at a rising or falling edge of the clock */
|
|
if (BITBANG_PDICLOCK_PORT & BITBANG_PDICLOCK_MASK)
|
|
{
|
|
/* If at rising clock edge and we are in send mode, abort */
|
|
if (IsSending)
|
|
return;
|
|
|
|
/* Wait for the start bit when receiving */
|
|
if ((SoftUSART_BitCount == BITS_IN_FRAME) && (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK))
|
|
return;
|
|
|
|
/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
|
|
* be discarded leaving the data to be byte-aligned for quick access */
|
|
if (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)
|
|
SoftUSART_Data |= (1 << (BITS_IN_FRAME - 1));
|
|
|
|
SoftUSART_Data >>= 1;
|
|
SoftUSART_BitCount--;
|
|
}
|
|
else
|
|
{
|
|
/* If at falling clock edge and we are in receive mode, abort */
|
|
if (!IsSending)
|
|
return;
|
|
|
|
/* Set the data line to the next bit value */
|
|
if (SoftUSART_Data & 0x01)
|
|
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
|
|
else
|
|
BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
|
|
|
|
SoftUSART_Data >>= 1;
|
|
SoftUSART_BitCount--;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
|
|
void PDITarget_EnableTargetPDI(void)
|
|
{
|
|
#if defined(PDI_VIA_HARDWARE_USART)
|
|
/* Set Tx and XCK as outputs, Rx as input */
|
|
DDRD |= (1 << 5) | (1 << 3);
|
|
DDRD &= ~(1 << 2);
|
|
|
|
/* Set DATA line high for at least 90ns to disable /RESET functionality */
|
|
PORTD |= (1 << 3);
|
|
asm volatile ("NOP"::);
|
|
asm volatile ("NOP"::);
|
|
|
|
/* Set up the synchronous USART for XMEGA communications -
|
|
8 data bits, even parity, 2 stop bits */
|
|
UBRR1 = (F_CPU / 1000000UL);
|
|
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) */
|
|
PDITarget_SendBreak();
|
|
PDITarget_SendBreak();
|
|
#else
|
|
/* Set DATA and CLOCK lines to outputs */
|
|
BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;
|
|
|
|
/* Set DATA line high for at least 90ns to disable /RESET functionality */
|
|
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
|
|
asm volatile ("NOP"::);
|
|
asm volatile ("NOP"::);
|
|
|
|
/* Fire timer compare ISR every 100 cycles to manage the software USART */
|
|
OCR1A = 80;
|
|
TCCR1B = (1 << WGM12) | (1 << CS10);
|
|
TIMSK1 = (1 << OCIE1A);
|
|
|
|
PDITarget_SendBreak();
|
|
PDITarget_SendBreak();
|
|
#endif
|
|
}
|
|
|
|
/** Disables the target's PDI interface, exits programming mode and starts the target's application. */
|
|
void PDITarget_DisableTargetPDI(void)
|
|
{
|
|
#if defined(PDI_VIA_HARDWARE_USART)
|
|
/* 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 */
|
|
DDRD &= ~((1 << 5) | (1 << 3));
|
|
PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
|
|
#else
|
|
/* Set DATA and CLOCK lines to inputs */
|
|
BITBANG_PDIDATA_DDR &= ~BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDICLOCK_DDR &= ~BITBANG_PDICLOCK_MASK;
|
|
|
|
/* Tristate DATA and CLOCK lines */
|
|
BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDICLOCK_PORT &= ~BITBANG_PDICLOCK_MASK;
|
|
|
|
TCCR0B = 0;
|
|
#endif
|
|
}
|
|
|
|
/** Sends a byte via the USART.
|
|
*
|
|
* \param[in] Byte Byte to send through the USART
|
|
*/
|
|
void PDITarget_SendByte(const uint8_t Byte)
|
|
{
|
|
#if defined(PDI_VIA_HARDWARE_USART)
|
|
/* Switch to Tx mode if currently in Rx mode */
|
|
if (!(IsSending))
|
|
{
|
|
PORTD |= (1 << 3);
|
|
DDRD |= (1 << 3);
|
|
|
|
UCSR1B |= (1 << TXEN1);
|
|
UCSR1B &= ~(1 << RXEN1);
|
|
|
|
IsSending = true;
|
|
}
|
|
|
|
/* Wait until there is space in the hardware Tx buffer before writing */
|
|
while (!(UCSR1A & (1 << UDRE1)));
|
|
UCSR1A |= (1 << TXC1);
|
|
UDR1 = Byte;
|
|
#else
|
|
/* Switch to Tx mode if currently in Rx mode */
|
|
if (!(IsSending))
|
|
{
|
|
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
|
|
|
|
IsSending = true;
|
|
}
|
|
|
|
/* Calculate the new USART frame data here while while we wait for a previous byte (if any) to finish sending */
|
|
uint16_t NewUSARTData = ((1 << 11) | (1 << 10) | (0 << 9) | ((uint16_t)Byte << 1) | (0 << 0));
|
|
|
|
/* Compute Even parity - while a bit is still set, chop off lowest bit and toggle parity bit */
|
|
uint8_t ParityData = Byte;
|
|
while (ParityData)
|
|
{
|
|
NewUSARTData ^= (1 << 9);
|
|
ParityData &= (ParityData - 1);
|
|
}
|
|
|
|
/* Wait until transmitter is idle before writing new data */
|
|
while (SoftUSART_BitCount);
|
|
|
|
/* Data shifted out LSB first, START DATA PARITY STOP STOP */
|
|
SoftUSART_Data = NewUSARTData;
|
|
SoftUSART_BitCount = BITS_IN_FRAME;
|
|
#endif
|
|
}
|
|
|
|
/** Receives a byte via the software USART, blocking until data is received.
|
|
*
|
|
* \return Received byte from the USART
|
|
*/
|
|
uint8_t PDITarget_ReceiveByte(void)
|
|
{
|
|
#if defined(PDI_VIA_HARDWARE_USART)
|
|
/* Switch to Rx mode if currently in Tx mode */
|
|
if (IsSending)
|
|
{
|
|
while (!(UCSR1A & (1 << TXC1)));
|
|
UCSR1A |= (1 << TXC1);
|
|
|
|
UCSR1B &= ~(1 << TXEN1);
|
|
UCSR1B |= (1 << RXEN1);
|
|
|
|
DDRD &= ~(1 << 3);
|
|
PORTD &= ~(1 << 3);
|
|
|
|
IsSending = false;
|
|
}
|
|
|
|
/* Wait until a byte has been received before reading */
|
|
while (!(UCSR1A & (1 << RXC1)));
|
|
return UDR1;
|
|
#else
|
|
/* Switch to Rx mode if currently in Tx mode */
|
|
if (IsSending)
|
|
{
|
|
while (SoftUSART_BitCount);
|
|
|
|
BITBANG_PDIDATA_DDR &= ~BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
|
|
|
|
IsSending = false;
|
|
}
|
|
|
|
/* Wait until a byte has been received before reading */
|
|
SoftUSART_BitCount = BITS_IN_FRAME;
|
|
while (SoftUSART_BitCount);
|
|
|
|
/* Throw away the parity and stop bits to leave only the data (start bit is already discarded) */
|
|
return (uint8_t)SoftUSART_Data;
|
|
#endif
|
|
}
|
|
|
|
/** Sends a BREAK via the USART to the attached target, consisting of a full frame of idle bits. */
|
|
void PDITarget_SendBreak(void)
|
|
{
|
|
#if defined(PDI_VIA_HARDWARE_USART)
|
|
/* Switch to Tx mode if currently in Rx mode */
|
|
if (!(IsSending))
|
|
{
|
|
PORTD |= (1 << 3);
|
|
DDRD |= (1 << 3);
|
|
|
|
UCSR1B &= ~(1 << RXEN1);
|
|
UCSR1B |= (1 << TXEN1);
|
|
|
|
IsSending = true;
|
|
}
|
|
|
|
/* Need to do nothing for a full frame to send a BREAK */
|
|
for (uint8_t i = 0; i < BITS_IN_FRAME; i++)
|
|
{
|
|
/* Wait for a full cycle of the clock */
|
|
while (PIND & (1 << 5));
|
|
while (!(PIND & (1 << 5)));
|
|
}
|
|
#else
|
|
/* Switch to Tx mode if currently in Rx mode */
|
|
if (!(IsSending))
|
|
{
|
|
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
|
|
BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
|
|
|
|
IsSending = true;
|
|
}
|
|
|
|
while (SoftUSART_BitCount);
|
|
|
|
/* Need to do nothing for a full frame to send a BREAK */
|
|
SoftUSART_Data = 0x0FFF;
|
|
SoftUSART_BitCount = BITS_IN_FRAME;
|
|
#endif
|
|
}
|
|
|
|
/** Busy-waits while the NVM controller is busy performing a NVM operation, such as a FLASH page read or CRC
|
|
* calculation.
|
|
*
|
|
* \return Boolean true if the NVM controller became ready within the timeout period, false otherwise
|
|
*/
|
|
bool PDITarget_WaitWhileNVMBusBusy(void)
|
|
{
|
|
TCNT0 = 0;
|
|
|
|
/* Poll the STATUS register to check to see if NVM access has been enabled */
|
|
while (TCNT0 < PDI_NVM_TIMEOUT_MS)
|
|
{
|
|
/* Send the LDCS command to read the PDI STATUS register to see the NVM bus is active */
|
|
PDITarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);
|
|
if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
#endif
|