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V33B: Updated 27C322 timings

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The first 10 words still do not get written though, not sure if I need something like a setup delay or if my eprom is broken.   
Too enable the eprom menu for testing 27C322 flashing change the following lines in Flash.ino:     
  // create menu with title and 3 options to choose from     
  unsigned char flashSlot;      
  // Copy menuOptions out of progmem      
  convertPgm(menuOptionsFlash, 3);      
  flashSlot = question_box("Select flashrom slot", menuOptions, 3, 0);
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sanni 2018-04-21 17:14:11 +02:00 committed by GitHub
parent 72a1a6d7c8
commit f9c89d4666
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2 changed files with 19 additions and 10 deletions
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4
Cart_Reader/Cart_Reader.ino
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@ -3,7 +3,7 @@
Author: sanni
Date: 04-21-2018
Version: V33A
Version: V33B
SD lib: https://github.com/greiman/SdFat
LCD lib: https://github.com/adafruit/Adafruit_SSD1306
@ -35,7 +35,7 @@
infinest - help with GB Memory cart
**********************************************************************************/
char ver[5] = "V33A";
char ver[5] = "V33B";
/******************************************
Define Starting Point

25
Cart_Reader/FLASH.ino
View File

@ -1643,24 +1643,33 @@ void writeWord_Eprom(unsigned long myAddress, word myData) {
PORTA = (myData >> 8) & 0xFF;
// Arduino running at 16Mhz -> one nop = 62.5ns
// Wait till output is stable
__asm__("nop\n\t");
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Switch VPP/OE(PH5) to HIGH
PORTH |= (1 << 5);
// Wait 1us for VPP High to Chip Enable Low
delayMicroseconds(1);
// Setting CE(PH6) LOW
PORTH &= ~(1 << 6);
// Leave VPP HIGH for a 50us programming pulse
delayMicroseconds(50);
// Leave VPP HIGH for 50us Chip Enable Program Pulse Width
delayMicroseconds(55);
// Setting CE(PH6) HIGH
PORTH |= (1 << 6);
// Wait 2us for Chip Enable High to VPP Transition
delayMicroseconds(2);
// Switch VPP/OE(PH5) to LOW
PORTH &= ~(1 << 5);
// Leave VPP LOW for a little bit
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Leave CE High for 1us for VPP Low to Chip Enable Low
delayMicroseconds(1);
// Setting CE(PH6) LOW
PORTH &= ~(1 << 6);
// Wait 1us for Chip Enable Low to Output Valid while program verify
delayMicroseconds(1);
}
word readWord_Eprom(unsigned long myAddress) {
@ -1673,11 +1682,12 @@ word readWord_Eprom(unsigned long myAddress) {
PORTL = (myAddress >> 16) & 0xFF;
// Arduino running at 16Mhz -> one nop = 62.5ns
__asm__("nop\n\t");
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Setting CE(PH6) LOW
PORTH &= ~(1 << 6);
// Delay for at least 100ns for read
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Read
@ -1693,7 +1703,6 @@ word readWord_Eprom(unsigned long myAddress) {
}
void blankcheck_Eprom() {
println_Msg(F("Please wait..."));
display_Update();