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Diffstat (limited to 'lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c')
| -rw-r--r-- | lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c new file mode 100644 index 000000000..0455329c3 --- /dev/null +++ b/lib/lufa/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c @@ -0,0 +1,209 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 + without fee, 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 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 + 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_XPROGTARGET_C +#include "XPROGTarget.h" + +#if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__) + +/** Flag to indicate if the USART is currently in Tx or Rx mode. */ +bool IsSending; + +/** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */ +void XPROGTarget_EnableTargetPDI(void) +{ + IsSending = false; + + /* 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); + _delay_us(100); + + /* Set up the synchronous USART for XMEGA 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 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. */ +void XPROGTarget_EnableTargetTPI(void) +{ + IsSending = false; + + /* Set /RESET line low for at least 400ns to enable TPI functionality */ + AUX_LINE_DDR |= AUX_LINE_MASK; + AUX_LINE_PORT &= ~AUX_LINE_MASK; + _delay_us(100); + + /* Set Tx and XCK as outputs, Rx as input */ + DDRD |= (1 << 5) | (1 << 3); + DDRD &= ~(1 << 2); + + /* 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 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 */ + if (IsSending) + XPROGTarget_SetRxMode(); + + /* Turn off receiver and transmitter of the USART, clear settings */ + UCSR1A = ((1 << TXC1) | (1 << RXC1)); + UCSR1B = 0; + UCSR1C = 0; + + /* Tristate all pins */ + DDRD &= ~((1 << 5) | (1 << 3)); + PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2)); +} + +/** Disables the target's TPI interface, exits programming mode and starts the target's application. */ +void XPROGTarget_DisableTargetTPI(void) +{ + /* Switch to Rx mode to ensure that all pending transmissions are complete */ + 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 inputs, tristate */ + DDRD &= ~((1 << 5) | (1 << 3)); + PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2)); + + /* Tristate target /RESET line */ + AUX_LINE_DDR &= ~AUX_LINE_MASK; + AUX_LINE_PORT &= ~AUX_LINE_MASK; +} + +/** Sends a byte via the USART. + * + * \param[in] Byte Byte to send through the USART + */ +void XPROGTarget_SendByte(const uint8_t Byte) +{ + /* Switch to Tx mode if currently in Rx mode */ + if (!(IsSending)) + XPROGTarget_SetTxMode(); + + /* Wait until there is space in the hardware Tx buffer before writing */ + while (!(UCSR1A & (1 << UDRE1))); + UCSR1A |= (1 << TXC1); + UDR1 = Byte; +} + +/** Receives a byte via the hardware USART, blocking until data is received or timeout expired. + * + * \return Received byte from the USART + */ +uint8_t XPROGTarget_ReceiveByte(void) +{ + /* Switch to Rx mode if currently in Tx mode */ + if (IsSending) + XPROGTarget_SetRxMode(); + + /* Wait until a byte has been received before reading */ + while (!(UCSR1A & (1 << RXC1)) && TimeoutTicksRemaining); + + return UDR1; +} + +/** 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 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)); + } +} + +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); + + UCSR1B &= ~(1 << RXEN1); + UCSR1B |= (1 << TXEN1); + + IsSending = true; +} + +static void XPROGTarget_SetRxMode(void) +{ + while (!(UCSR1A & (1 << TXC1))); + UCSR1A |= (1 << TXC1); + + UCSR1B &= ~(1 << TXEN1); + UCSR1B |= (1 << RXEN1); + + DDRD &= ~(1 << 3); + PORTD &= ~(1 << 3); + + IsSending = false; +} + +#endif + |