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Manage initialization of pin INPUT with HIGH value to set pin mode

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input, so pull-up and pull-down resistor for correct management is
needed now, to restore previous decomment #define
PCF8574_SOFT_INITIALIZATION
This commit is contained in:
Renzo Mischianti 2020-05-26 22:06:42 +02:00
parent b6fa26e50d
commit 858f960d1e
2 changed files with 26 additions and 4 deletions
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27
PCF8574.cpp
View File

@ -200,12 +200,18 @@ void PCF8574::begin(){
DEBUG_PRINT("resetInitial pin ");
#ifdef PCF8574_SOFT_INITIALIZATION
resetInitial = writeModeUp | readModePullUp;
#else
resetInitial = writeModeUp | readMode;
#endif
DEBUG_PRINTLN( resetInitial, BIN);
_wire->beginTransmission(_address);
_wire->write(resetInitial);
byteBuffered = resetInitial;
initialBuffer = writeModeUp | readModePullUp;
byteBuffered = initialBuffer;
writeByteBuffered = writeModeUp;
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");
@ -501,7 +507,11 @@ void PCF8574::readBuffer(bool force){
if ((bit(7) & writeMode)>0) digitalInput.p7 = ((writeByteBuffered & bit(7))>0)?HIGH:LOW;
//if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
// byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
byteBuffered = (initialBuffer & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN);
//}
@ -536,7 +546,8 @@ void PCF8574::readBuffer(bool force){
byte byteRead = byteBuffered | writeByteBuffered;
//if ((byteBuffered & readModePullDown)>0 and (~byteBuffered & readModePullUp)>0){
byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
// byteBuffered = (resetInitial & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
byteBuffered = (initialBuffer & readMode) | (byteBuffered & ~readMode); //~readMode & byteBuffered;
DEBUG_PRINT("Buffer hight value readed set readed ");
DEBUG_PRINTLN(byteBuffered, BIN);
//}
@ -565,7 +576,7 @@ uint8_t PCF8574::digitalRead(uint8_t pin, bool forceReadNow){
// DEBUG_PRINTLN(byteBuffered, BIN);
if (((bit(pin) & (readModePullDown & byteBuffered))>0) or (bit(pin) & (readModePullUp & ~byteBuffered))>0 ){
if ((((bit(pin) & (readModePullDown & byteBuffered))>0) or (bit(pin) & (readModePullUp & ~byteBuffered))>0 )){
DEBUG_PRINTLN(" ...Pin already set");
if ((bit(pin) & byteBuffered)>0){
value = HIGH;
@ -645,10 +656,18 @@ void PCF8574::digitalWrite(uint8_t pin, uint8_t value){
// writeByteBuffered = writeByteBuffered & (~writeMode & byteBuffered);
byteBuffered = (writeByteBuffered & writeMode) | (resetInitial & readMode);
// byteBuffered = (writeByteBuffered & writeMode) | (byteBuffered & readMode);
DEBUG_PRINT(" byteBuffered ");
DEBUG_PRINTLN(byteBuffered, BIN);
DEBUG_PRINT("Going to write data ");
DEBUG_PRINTLN(writeByteBuffered, BIN);
_wire->write(byteBuffered);
byteBuffered = (writeByteBuffered & writeMode) | (initialBuffer & readMode);
// byteBuffered = (writeByteBuffered & writeMode) & (byteBuffered & readMode);
DEBUG_PRINTLN("Start end trasmission if stop here check pullup resistor.");

3
PCF8574.h
View File

@ -55,6 +55,8 @@
// Uncomment for low memory usage this prevent use of complex DigitalInput structure and free 7byte of memory
// #define PCF8574_LOW_LATENCY
//#define PCF8574_SOFT_INITIALIZATION
// Select an algorithm to manage encoder progression
//#define BASIC_ENCODER_ALGORITHM
#define MISCHIANTI_ENCODER_ALGORITHM
@ -186,6 +188,7 @@ private:
byte readModePullDown = B00000000;
byte byteBuffered = B00000000;
byte resetInitial = B00000000;
byte initialBuffer = B00000000;
unsigned long lastReadMillis = 0;
byte writeByteBuffered = B00000000;