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Fix pin assignments on 8755A device to match the schematic

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Tom Nisbet 2018-12-20 15:38:07 -05:00
parent 00c251a177
commit 4dbabf7630
1 changed files with 115 additions and 115 deletions
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TommyPROM/PromDevice8755A.cpp
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@ -1,115 +1,115 @@
#include "Configure.h" #include "Configure.h"
#if defined(PROM_IS_8755A) #if defined(PROM_IS_8755A)
#define CE1 A0 #define CE2 A0
#define CE2 A1 #define RD A1
#define RD A2 #define CE1 A2
#define AD8 A5 #define AD10 A3
#define AD9 A4 #define AD9 A4
#define AD10 A3 #define AD8 A5
#define ALE 12 #define ALE 10
#define VDDCTL 11 #define VDDCTL 12
PromDevice8755A::PromDevice8755A(unsigned long size) PromDevice8755A::PromDevice8755A(unsigned long size)
: PromDevice(size, 0, 0, false) : PromDevice(size, 0, 0, false)
{ {
} }
void PromDevice8755A::begin() void PromDevice8755A::begin()
{ {
// Define the data bus as input initially so that it does not put out a // Define the data bus as input initially so that it does not put out a
// signal that could collide with output on the data pins of the EEPROM. // signal that could collide with output on the data pins of the EEPROM.
setDataBusMode(INPUT); setDataBusMode(INPUT);
// Define the EEPROM control pins as output, making sure they are all // Define the EEPROM control pins as output, making sure they are all
// in the disabled state. // in the disabled state.
digitalWrite(RD, HIGH); digitalWrite(RD, HIGH);
pinMode(RD, OUTPUT); pinMode(RD, OUTPUT);
digitalWrite(VDDCTL, LOW); digitalWrite(VDDCTL, LOW);
pinMode(VDDCTL, OUTPUT); pinMode(VDDCTL, OUTPUT);
digitalWrite(CE1, LOW); digitalWrite(CE1, LOW);
pinMode(CE1, OUTPUT); pinMode(CE1, OUTPUT);
digitalWrite(CE2, LOW); digitalWrite(CE2, LOW);
pinMode(CE2, OUTPUT); pinMode(CE2, OUTPUT);
digitalWrite(ALE, LOW); digitalWrite(ALE, LOW);
pinMode(ALE, OUTPUT); pinMode(ALE, OUTPUT);
// The address control pins are always outputs. // The address control pins are always outputs.
pinMode(AD8, OUTPUT); pinMode(AD8, OUTPUT);
pinMode(AD9, OUTPUT); pinMode(AD9, OUTPUT);
pinMode(AD10, OUTPUT); pinMode(AD10, OUTPUT);
digitalWrite(AD8, LOW); digitalWrite(AD8, LOW);
digitalWrite(AD9, LOW); digitalWrite(AD9, LOW);
digitalWrite(AD10, LOW); digitalWrite(AD10, LOW);
} }
// BEGIN PRIVATE METHODS // BEGIN PRIVATE METHODS
// //
// Set an 11 bit address using the 8 address/data bus lines and three more dedicated // Set an 11 bit address using the 8 address/data bus lines and three more dedicated
// address lines. The read and burn code will take care of the ALE line // address lines. The read and burn code will take care of the ALE line
void PromDevice8755A::setAddress(word address) void PromDevice8755A::setAddress(word address)
{ {
writeDataBus(byte(address & 0xff)); writeDataBus(byte(address & 0xff));
digitalWrite(AD8, address & 0x100 ? HIGH : LOW); digitalWrite(AD8, address & 0x100 ? HIGH : LOW);
digitalWrite(AD9, address & 0x200 ? HIGH : LOW); digitalWrite(AD9, address & 0x200 ? HIGH : LOW);
digitalWrite(AD10, address & 0x400 ? HIGH : LOW); digitalWrite(AD10, address & 0x400 ? HIGH : LOW);
} }
// Read a byte from a given address // Read a byte from a given address
byte PromDevice8755A::readByte(word address) byte PromDevice8755A::readByte(word address)
{ {
byte data = 0; byte data = 0;
digitalWrite(RD, HIGH); digitalWrite(RD, HIGH);
digitalWrite(CE1, LOW); digitalWrite(CE1, LOW);
// Put the address on the bus and latch it with ALE // Put the address on the bus and latch it with ALE
digitalWrite(CE2, HIGH); digitalWrite(CE2, HIGH);
setDataBusMode(OUTPUT); setDataBusMode(OUTPUT);
setAddress(address); setAddress(address);
digitalWrite(ALE, HIGH); digitalWrite(ALE, HIGH);
digitalWrite(ALE, LOW); digitalWrite(ALE, LOW);
// Read a byte // Read a byte
setDataBusMode(INPUT); setDataBusMode(INPUT);
setAddress(0xff); setAddress(0xff);
digitalWrite(RD, LOW); digitalWrite(RD, LOW);
delayMicroseconds(1); delayMicroseconds(1);
data = readDataBus(); data = readDataBus();
digitalWrite(RD, HIGH); digitalWrite(RD, HIGH);
digitalWrite(CE2, LOW); digitalWrite(CE2, LOW);
return data; return data;
} }
// Burn a byte to the chip and verify that it was written. // Burn a byte to the chip and verify that it was written.
bool PromDevice8755A::burnByte(byte value, word address) bool PromDevice8755A::burnByte(byte value, word address)
{ {
// Latch the address and the CE lines // Latch the address and the CE lines
digitalWrite(ALE, HIGH); digitalWrite(ALE, HIGH);
digitalWrite(CE1, LOW); digitalWrite(CE1, LOW);
digitalWrite(CE2, HIGH); digitalWrite(CE2, HIGH);
setAddress(address); setAddress(address);
digitalWrite(ALE, LOW); digitalWrite(ALE, LOW);
// Burn the byte value by setting CE1 high and then setting VDD to +25V for 50ms. // Burn the byte value by setting CE1 high and then setting VDD to +25V for 50ms.
setDataBusMode(OUTPUT); setDataBusMode(OUTPUT);
writeDataBus(value); writeDataBus(value);
digitalWrite(CE1, HIGH); digitalWrite(CE1, HIGH);
digitalWrite(VDDCTL, HIGH); digitalWrite(VDDCTL, HIGH);
delay(50); delay(50);
digitalWrite(VDDCTL, LOW); digitalWrite(VDDCTL, LOW);
digitalWrite(CE1, LOW); digitalWrite(CE1, LOW);
// Read back the value and return success if it matches // Read back the value and return success if it matches
return readByte(address) == value; return readByte(address) == value;
} }
#endif // #if defined(PROM_IS_8755A) #endif // #if defined(PROM_IS_8755A)