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185 lines
6.7 KiB
185 lines
6.7 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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 disclaim 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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#if defined(ENABLE_SPI_PROTOCOL)
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/** \file
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*
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* Target-related functions for the ISP Protocol decoder.
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*/
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#include "ISPTarget.h"
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/** Converts the given AVR Studio SCK duration parameter (set by a SET PARAM command from the host) to the nearest
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* possible SPI clock prescaler mask for passing to the SPI_Init() routine.
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*
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* \return Nearest SPI prescaler mask for the given SCK frequency
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*/
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uint8_t ISPTarget_GetSPIPrescalerMask(void)
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{
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static const uint8_t SPIMaskFromSCKDuration[] =
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{
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#if (F_CPU == 8000000)
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SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 4MHz SPI
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SPI_SPEED_FCPU_DIV_2, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI
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SPI_SPEED_FCPU_DIV_4, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI
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SPI_SPEED_FCPU_DIV_8, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI
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SPI_SPEED_FCPU_DIV_16, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
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SPI_SPEED_FCPU_DIV_32, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
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SPI_SPEED_FCPU_DIV_64 // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
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#elif (F_CPU == 16000000)
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SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 8MHz SPI
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SPI_SPEED_FCPU_DIV_4, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI
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SPI_SPEED_FCPU_DIV_8, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI
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SPI_SPEED_FCPU_DIV_16, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI
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SPI_SPEED_FCPU_DIV_32, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
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SPI_SPEED_FCPU_DIV_64, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
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SPI_SPEED_FCPU_DIV_128 // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
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#else
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#error No SPI prescaler masks for chosen F_CPU speed.
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#endif
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};
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uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION);
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if (SCKDuration >= sizeof(SPIMaskFromSCKDuration))
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SCKDuration = (sizeof(SPIMaskFromSCKDuration) - 1);
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return SPIMaskFromSCKDuration[SCKDuration];
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}
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/** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command.
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* When not asserted, the line is tristated so as not to interfere with normal device operation.
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*
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* \param[in] ResetTarget Boolean true when the target should be held in reset, false otherwise
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*/
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void ISPTarget_ChangeTargetResetLine(bool ResetTarget)
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{
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if (ResetTarget)
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{
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RESET_LINE_DDR |= RESET_LINE_MASK;
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if (!(V2Params_GetParameterValue(PARAM_RESET_POLARITY)))
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RESET_LINE_PORT |= RESET_LINE_MASK;
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}
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else
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{
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RESET_LINE_DDR &= ~RESET_LINE_MASK;
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RESET_LINE_PORT &= ~RESET_LINE_MASK;
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}
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}
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/** Waits until the last issued target memory programming command has completed, via the check mode given and using
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* the given parameters.
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*
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* \param[in] ProgrammingMode Programming mode used and completion check to use, a mask of PROG_MODE_* constants
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* \param[in] PollAddress Memory address to poll for completion if polling check mode used
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* \param[in] PollValue Poll value to check against if polling check mode used
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* \param[in] DelayMS Milliseconds to delay before returning if delay check mode used
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* \param[in] ReadMemCommand Device low-level READ MEMORY command to send if value check mode used
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*
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* \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT or
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* \ref STATUS_CMD_TOUT otherwise
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*/
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uint8_t ISPTarget_WaitForProgComplete(uint8_t ProgrammingMode, uint16_t PollAddress, uint8_t PollValue,
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uint8_t DelayMS, uint8_t ReadMemCommand)
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{
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uint8_t ProgrammingStatus = STATUS_CMD_OK;
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/* Determine method of Programming Complete check */
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switch (ProgrammingMode & ~(PROG_MODE_PAGED_WRITES_MASK | PROG_MODE_COMMIT_PAGE_MASK))
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{
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case PROG_MODE_WORD_TIMEDELAY_MASK:
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case PROG_MODE_PAGED_TIMEDELAY_MASK:
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V2Protocol_DelayMS(DelayMS);
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break;
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case PROG_MODE_WORD_VALUE_MASK:
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case PROG_MODE_PAGED_VALUE_MASK:
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TCNT0 = 0;
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do
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{
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SPI_SendByte(ReadMemCommand);
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SPI_SendByte(PollAddress >> 8);
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SPI_SendByte(PollAddress & 0xFF);
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}
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while ((SPI_TransferByte(0x00) != PollValue) && (TCNT0 < TARGET_BUSY_TIMEOUT_MS));
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if (TCNT0 >= TARGET_BUSY_TIMEOUT_MS)
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ProgrammingStatus = STATUS_CMD_TOUT;
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break;
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case PROG_MODE_WORD_READYBUSY_MASK:
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case PROG_MODE_PAGED_READYBUSY_MASK:
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ProgrammingStatus = ISPTarget_WaitWhileTargetBusy();
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break;
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}
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return ProgrammingStatus;
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}
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/** Waits until the target has completed the last operation, by continuously polling the device's
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* BUSY flag until it is cleared, or until the \ref TARGET_BUSY_TIMEOUT_MS timeout period has expired.
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*
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* \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT otherwise
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*/
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uint8_t ISPTarget_WaitWhileTargetBusy(void)
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{
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TCNT0 = 0;
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do
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{
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SPI_SendByte(0xF0);
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SPI_SendByte(0x00);
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SPI_SendByte(0x00);
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}
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while ((SPI_ReceiveByte() & 0x01) && (TCNT0 < TARGET_BUSY_TIMEOUT_MS));
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if (TCNT0 >= TARGET_BUSY_TIMEOUT_MS)
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return STATUS_RDY_BSY_TOUT;
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else
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return STATUS_CMD_OK;
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}
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/** Sends a low-level LOAD EXTENDED ADDRESS command to the target, for addressing of memory beyond the
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* 64KB boundary. This sends the command with the correct address as indicated by the current address
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* pointer variable set by the host when a SET ADDRESS command is issued.
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*/
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void ISPTarget_LoadExtendedAddress(void)
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{
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SPI_SendByte(0x4D);
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SPI_SendByte(0x00);
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SPI_SendByte((CurrentAddress & 0x00FF0000) >> 16);
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SPI_SendByte(0x00);
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}
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#endif
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