mirror of
https://github.com/sanni/cartreader.git
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266 lines
7.9 KiB
C++
266 lines
7.9 KiB
C++
/********************************************************************
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* Open Source Cartridge Reader */
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/*H******************************************************************
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* FILENAME : OSCR.cpp
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*
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* DESCRIPTION :
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* Contains various enums, variables, etc, for the main program.
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*
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* PUBLIC FUNCTIONS :
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* void setClockScale( VOLTS )
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*
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* NOTES :
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* This file is a WIP, I've been moving things into it on my local working
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* copy, but they are not ready yet. Rather than put this in the main file
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* only to move them back again, I decided to commit it early. If you need
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* to add new globals, enums, defines, etc, please use this file!
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*
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* LICENSE :
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* CHANGES :
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*
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* REF NO VERSION DATE WHO DETAIL
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* 12.5 2023-03-29 Ancyker Initial version
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*
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*H*/
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#include "OSCR.h"
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/*==== VARIABLES ==================================================*/
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// Firmware Version
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char ver[5] = "12.9";
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// Clock speed
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unsigned long clock = CS_16MHZ;
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// Voltage
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VOLTS voltage = VOLTS_SET_5V;
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/*==== /VARIABLES =================================================*/
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/*F******************************************************************
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* NAME : void printVersionToSerial()
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*
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* DESCRIPTION : Prints the version & feature string to serial
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*
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*F*/
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#if !defined(enable_serial) && defined(ENABLE_UPDATER)
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void printVersionToSerial() {
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ClockedSerial.print(F("OSCR"));
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ClockedSerial.print(F("::"));
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ClockedSerial.print(ver);
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ClockedSerial.print(F("//"));
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#if defined(HW1)
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ClockedSerial.print(F("HW1"));
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#elif defined(HW2)
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ClockedSerial.print(F("HW2"));
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#elif defined(HW3)
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ClockedSerial.print(F("HW3"));
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#elif defined(HW4)
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ClockedSerial.print(F("HW4"));
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#elif defined(HW5)
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ClockedSerial.print(F("HW5"));
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#elif defined(SERIAL_MONITOR)
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ClockedSerial.print(F("Serial"));
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#else
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ClockedSerial.print(F("HW?"));
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#endif
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#if defined (ENABLE_VSELECT)
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ClockedSerial.print(F("|VSELECT"));
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#endif
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#if defined (RTC_installed)
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ClockedSerial.print(F("|RTC"));
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#endif
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#if defined (clockgen_installed)
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ClockedSerial.print(F("|CLOCKGEN"));
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#endif
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#if defined (fastcrc)
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ClockedSerial.print(F("|FASTCRC"));
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#endif
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#if defined (ENABLE_3V3FIX)
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ClockedSerial.print(F("|3V3FIX"));
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#endif
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ClockedSerial.println(F(""));
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}
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#else
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void printVersionToSerial() {}
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#endif
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/*F******************************************************************
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* NAME : void setClockScale( ClockScale )
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*
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* DESCRIPTION : Set ATMEGA2560 clock prescaler
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*
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* INPUTS :
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* PARAMETERS:
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* VOLTS ClockScale Clock scale
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*
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* PROCESS :
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* [1] Enable clock prescaler change
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* [2] Apply clock prescaler
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*
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* NOTES :
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* Changing the clock prescaler to a value other than F_CPU (1 by default)
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* can/will result in some clock-based functions not working, including
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* timers and most communication protocols.
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*
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* FURTHER READING :
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* ATmega640/V-1280/V-1281/V-2560/V-2561/V § 10.13.2 [PDF: https://rmy.pw/atmega2560]
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*
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*F*/
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void setClockScale(VOLTS __x)
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{
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uint8_t __tmp = _BV(CLKPCE); /*[1]*/
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__asm__ __volatile__ (
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"in __tmp_reg__,__SREG__" "\n\t"
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"cli" "\n\t"
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"sts %1, %0" "\n\t"
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"sts %1, %2" "\n\t"
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"out __SREG__, __tmp_reg__"
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: /* no outputs */
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: "d" (__tmp),
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"M" (_SFR_MEM_ADDR(CLKPR)),
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"d" (__x)
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: "r0"
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); /*[2]*/
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}
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/*F******************************************************************
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* NAME : VOLTS setVoltage( Voltage )
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*
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* DESCRIPTION : Adjust voltage (and clock prescaler, if enabled)
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*
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* INPUTS :
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* PARAMETERS:
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* VOLTS Voltage Voltage
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*
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* OUTPUTS :
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* RETURN :
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* Type: VOLTS Result:
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* Values: VOLTS_SUCCESS Successfully set the voltage/clock
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* VOLTS_ERROR Something went wrong
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* VOLTS_NOTENABLED VSELECT and 3V3FIX are both disabled
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*
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* PROCESS :
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* [1] Apply voltage
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* [2] Apply clock prescaler
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*
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* NOTES :
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* When changing to 5V the voltage is set first so that the MPU
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* will be stable at 16MHz. When going down to 3.3V the clock
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* is changed to 8MHz first so that the MPU will be stable when
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* the voltage is changed to 3.3V.
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*
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* This works best with VSELECT as the firmware controls the
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* timing of all of this. If you are doing this manually, then
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* you'll need to start the OSCR with 5V set and only switch to
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* 3.3V once on the main menu.
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*
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*F*/
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#if defined(ENABLE_VSELECT) || defined(ENABLE_3V3FIX)
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VOLTS setVoltage(VOLTS newVoltage) {
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switch(newVoltage) {
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/* 5V */
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case VOLTS_SET_5V:
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if (
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#if defined(ENABLE_3V3FIX)
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clock == CS_16MHZ
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#endif
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#if defined(ENABLE_VSELECT) && defined(ENABLE_3V3FIX)
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&&
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#endif
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#if defined(ENABLE_VSELECT)
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VOLTS_SET_5V == voltage
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#endif
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) return VOLTS_SUCCESS; // Just return if already as requested
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// Adjust voltage high if VSELECT is available
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#if defined(ENABLE_VSELECT)
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PORTD &= ~(1 << 7); /*[1]*/
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voltage = VOLTS_SET_5V;
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#endif
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// Adjust clock speed when 3V3FIX is enabled
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#if defined(ENABLE_3V3FIX)
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// Stop serial if running
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#if !defined(enable_serial) && defined(ENABLE_UPDATER)
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ClockedSerial.end();
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#endif
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// Set clock speed
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clock = CS_16MHZ;
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setClockScale(newVoltage); /*[2]*/
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// Restart serial
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#if !defined(enable_serial) && defined(ENABLE_UPDATER)
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ClockedSerial.begin(UPD_BAUD);
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#endif
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#else
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clock = CS_16MHZ;
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#endif
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// Done
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return VOLTS_SUCCESS;
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/* 3.3V */
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case VOLTS_SET_3V3:
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if (
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#if defined(ENABLE_3V3FIX)
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clock == CS_8MHZ
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#endif
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#if defined(ENABLE_VSELECT) && defined(ENABLE_3V3FIX)
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&&
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#endif
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#if defined(ENABLE_VSELECT)
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VOLTS_SET_3V3 == voltage
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#endif
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) return VOLTS_SUCCESS; // Just return if already as requested
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// Adjust clock speed when 3V3FIX is enabled
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#if defined(ENABLE_3V3FIX)
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#if !defined(enable_serial) && defined(ENABLE_UPDATER)
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ClockedSerial.end();
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#endif
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// Set clock speed
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clock = CS_8MHZ;
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setClockScale(newVoltage); /*[2]*/
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#if !defined(enable_serial) && defined(ENABLE_UPDATER)
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ClockedSerial.begin(UPD_BAUD);
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#endif
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#endif
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// Adjust voltage high if VSELECT is available
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#if defined(ENABLE_VSELECT)
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PORTD |= (1 << 7); /*[1]*/
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voltage = VOLTS_SET_3V3;
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#endif
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// Done
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return VOLTS_SUCCESS;
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/* ??? */
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default:
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return VOLTS_ERROR;
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}
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}
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#else
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// The compiler will optimize this out when this condition is met.
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// Yes, even though it has a return value it will only be compiled
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// if something reads that value. Currently nothing does.
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VOLTS setVoltage(VOLTS newVoltage __attribute__((unused))) {
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return VOLTS_NOTENABLED;
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}
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#endif
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