Macintosh-SW
/
mac-rom-simm-programmer
mirror of https://github.com/dougg3/mac-rom-simm-programmer.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
mac-rom-simm-programmer/led.h

66 lines
1.4 KiB
C
Raw Normal View History

Added LED toggle to write/read modes. Read is so fast that you can't even see the blinking, but oh well. I also added an "led.h" header file that I should have done long ago.
2012-05-27 22:41:16 +00:00
/*
* led.h
*
* Created on: May 27, 2012
* Author: Doug
Add/update copyright This just makes sure everything is up to date with copyrights.
2020-11-23 06:28:47 +00:00
*
* Copyright (C) 2011-2020 Doug Brown
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
Added LED toggle to write/read modes. Read is so fast that you can't even see the blinking, but oh well. I also added an "led.h" header file that I should have done long ago.
2012-05-27 22:41:16 +00:00
*/
#ifndef LED_H_
#define LED_H_
Break out code into a HAL, optimize flash operations This makes the code pretty easily portable to other architectures if someone wants to make a more modern SIMM programmer. I also was pretty careful to split responsibilities of the different components and give the existing components better names. I'm pretty happy with the organization of the code now. As part of this change I have also heavily optimized the code. In particular, the read and write cycle routines are very important to the overall performance of the programmer. In these routines I had to make some tradeoffs of code performance versus prettiness, but the overall result is much faster programming. Some of these performance changes are the result of what I discovered when I upgraded my AVR compiler. I discovered that it is smarter at looking at 32-bit variables when I use a union instead of bitwise operations. I also shaved off more CPU cycles by carefully making a few small tweaks. I added a bypass for the "program only some chips" mask, because it was adding unnecessary CPU cycles for a feature that is rarely used. I removed the verification feature from the write routine, because we can always verify the data after the write chunk is complete, which is more efficient. I also added assumptions about the initial/final state of the CS/OE/WE pins, which allowed me to remove more valuable CPU cycles from the read/write cycle routines. There are also a few enormous performance optimizations I should have done a long time ago: 1) The code was only handling one received byte per main loop iteration. Reading every byte available cut nearly a minute off of the 8 MB programming time. 2) The code wasn't taking advantage of the faster programming command available in the chips used on the 8 MB SIMM. The end result of all of these optimizations is I have programming time of the 8 MB SIMM down to 3:31 (it used to be 8:43). Another minor issue I fixed: the Micron SIMM chip identification wasn't working properly. It was outputting the manufacturer ID again instead of the device ID.
2020-11-18 05:03:32 +00:00
#include "hal/board.h"
#include "hal/gpio.h"
Added LED toggle to write/read modes. Read is so fast that you can't even see the blinking, but oh well. I also added an "led.h" header file that I should have done long ago.
2012-05-27 22:41:16 +00:00
Break out code into a HAL, optimize flash operations This makes the code pretty easily portable to other architectures if someone wants to make a more modern SIMM programmer. I also was pretty careful to split responsibilities of the different components and give the existing components better names. I'm pretty happy with the organization of the code now. As part of this change I have also heavily optimized the code. In particular, the read and write cycle routines are very important to the overall performance of the programmer. In these routines I had to make some tradeoffs of code performance versus prettiness, but the overall result is much faster programming. Some of these performance changes are the result of what I discovered when I upgraded my AVR compiler. I discovered that it is smarter at looking at 32-bit variables when I use a union instead of bitwise operations. I also shaved off more CPU cycles by carefully making a few small tweaks. I added a bypass for the "program only some chips" mask, because it was adding unnecessary CPU cycles for a feature that is rarely used. I removed the verification feature from the write routine, because we can always verify the data after the write chunk is complete, which is more efficient. I also added assumptions about the initial/final state of the CS/OE/WE pins, which allowed me to remove more valuable CPU cycles from the read/write cycle routines. There are also a few enormous performance optimizations I should have done a long time ago: 1) The code was only handling one received byte per main loop iteration. Reading every byte available cut nearly a minute off of the 8 MB programming time. 2) The code wasn't taking advantage of the faster programming command available in the chips used on the 8 MB SIMM. The end result of all of these optimizations is I have programming time of the 8 MB SIMM down to 3:31 (it used to be 8:43). Another minor issue I fixed: the Micron SIMM chip identification wasn't working properly. It was outputting the manufacturer ID again instead of the device ID.
2020-11-18 05:03:32 +00:00
/** Initializes the LED and turns it off
*
*/
static inline void LED_Init(void)
{
GPIOPin ledPin = Board_LEDPin();
GPIO_SetDirection(ledPin, true);
GPIO_SetOff(ledPin);
}
/** Turns the LED on
*
*/
static inline void LED_On(void)
{
GPIO_SetOn(Board_LEDPin());
}
/** Turns the LED off
*
*/
static inline void LED_Off(void)
{
GPIO_SetOff(Board_LEDPin());
}
/** Toggles the LED
*
*/
static inline void LED_Toggle(void)
{
GPIO_Toggle(Board_LEDPin());
}
Added LED toggle to write/read modes. Read is so fast that you can't even see the blinking, but oh well. I also added an "led.h" header file that I should have done long ago.
2012-05-27 22:41:16 +00:00
#endif /* LED_H_ */