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PCF8574 output pin initialization parameter

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Ash-4 2025-05-13 12:24:16 -05:00
parent 93a3ea49a2
commit 4f3b7068ca
3 changed files with 19 additions and 4 deletions
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13
IO_PCF8574.h
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@ -1,4 +1,5 @@
/* /*
* © 2025 Herb Morton
* © 2022 Paul M Antoine * © 2022 Paul M Antoine
* © 2021, Neil McKechnie. All rights reserved. * © 2021, Neil McKechnie. All rights reserved.
* *
@ -43,15 +44,21 @@
class PCF8574 : public GPIOBase<uint8_t> { class PCF8574 : public GPIOBase<uint8_t> {
public: public:
static void create(VPIN firstVpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1) { static void create(VPIN firstVpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1, int initPortState=-1) {
if (checkNoOverlap(firstVpin, nPins, i2cAddress)) new PCF8574(firstVpin, nPins, i2cAddress, interruptPin); if (checkNoOverlap(firstVpin, nPins, i2cAddress)) new PCF8574(firstVpin, nPins, i2cAddress, interruptPin, initPortState);
} }
private: private:
PCF8574(VPIN firstVpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1) PCF8574(VPIN firstVpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1, int initPortState=-1)
: GPIOBase<uint8_t>((FSH *)F("PCF8574"), firstVpin, nPins, i2cAddress, interruptPin) : GPIOBase<uint8_t>((FSH *)F("PCF8574"), firstVpin, nPins, i2cAddress, interruptPin)
{ {
requestBlock.setReadParams(_I2CAddress, inputBuffer, 1); requestBlock.setReadParams(_I2CAddress, inputBuffer, 1);
if (initPortState>=0) {
_portMode = 255; // set all pins to output mode
_portInUse = 255; // 8 ports in use
_portOutputState = initPortState; // initialize pins low-high 0-255
I2CManager.write(_I2CAddress, 1, initPortState);
}
} }
// The PCF8574 handles inputs by applying a weak pull-up when output is driven to '1'. // The PCF8574 handles inputs by applying a weak pull-up when output is driven to '1'.

7
myHal.cpp_example.txt
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@ -146,7 +146,14 @@ void halSetup() {
//PCF8574::create(200, 8, 0x23, 40); //PCF8574::create(200, 8, 0x23, 40);
// Alternative form to initialize 8 pins as output
// INT pin -1, when INT is not used
//PCF8574::create(200, 8, 0x23, -1, 255); 8 pins High
//PCF8574::create(200, 8, 0x23, -1, 0); 8 pins Low
//PCF8574::create(200, 8, 0x23, -1, 0b11000010);
// pins listed sequentially from 7 to 0
//======================================================================= //=======================================================================
// The following directive defines a PCF8575 16-port I2C GPIO Extender module. // The following directive defines a PCF8575 16-port I2C GPIO Extender module.
//======================================================================= //=======================================================================

3
version.h
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@ -3,7 +3,8 @@
#include "StringFormatter.h" #include "StringFormatter.h"
#define VERSION "5.5.26" #define VERSION "5.5.27"
// 5.5.27 - PCF8574 output pin initialization parameter
// 5.5.26 - PCA9554 and TCA9554/9534 I2C 8-bit GPIO expander drivers // 5.5.26 - PCA9554 and TCA9554/9534 I2C 8-bit GPIO expander drivers
// 5.2.25 - IO_Bitmap and assicated Exrail macros // 5.2.25 - IO_Bitmap and assicated Exrail macros
// 5.5.24 - SensorCAM in I2C scan and automatically setClock // 5.5.24 - SensorCAM in I2C scan and automatically setClock