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117 lines
3.1 KiB
117 lines
3.1 KiB
16 years ago
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/*
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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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/** \file
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*
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* Target-related functions for the V2 Protocol decoder.
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*/
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#include "V2ProtocolTarget.h"
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/** Current memory address for FLASH/EEPROM memory read/write commands */
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uint32_t CurrentAddress;
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/** Table of masks for SPI_Init() from a given PARAM_SCK_DURATION value */
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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,
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#endif
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SPI_SPEED_FCPU_DIV_2, SPI_SPEED_FCPU_DIV_4, SPI_SPEED_FCPU_DIV_8,
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SPI_SPEED_FCPU_DIV_16, SPI_SPEED_FCPU_DIV_32, SPI_SPEED_FCPU_DIV_64
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#if (F_CPU == 16000000)
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, SPI_SPEED_FCPU_DIV_128
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#endif
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};
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uint8_t V2Protocol_GetSPIPrescalerMask(void)
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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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void V2Protocol_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_PORT &= ~RESET_LINE_MASK;
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RESET_LINE_DDR &= ~RESET_LINE_MASK;
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}
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}
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void V2Protocol_DelayMS(uint8_t MS)
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{
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while (MS--)
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_delay_ms(1);
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}
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uint8_t V2Protocol_WaitWhileTargetBusy(void)
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{
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uint8_t TimeoutMS = TARGET_BUSY_TIMEOUT_MS;
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uint8_t ResponseByte;
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do
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{
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V2Protocol_DelayMS(1);
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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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ResponseByte = SPI_ReceiveByte();
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}
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while ((ResponseByte & 0x01) && (TimeoutMS--));
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if (!(TimeoutMS))
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return STATUS_CMD_TOUT;
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else
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return STATUS_CMD_OK;
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}
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void V2Protocol_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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