Version 1.2.0

README.md

@@ -1,3 +1,5 @@
+[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/paypalme/whitelight976)
+
 
 ![ lcd ](https://github.com/gavinlyonsrepo/pic_16F1619_projects/blob/master/images/LCDPCF.jpg)
 
@@ -22,6 +24,7 @@ Overview
 3. Custom character support + print class for numerical data.
 4. Hardware I2C 
 5. Tested on size 16x02 + 20x04 (but may work on other sizes  eg 16X4 but not tested).
+6. Can support both I2C ports on the STM32 see tested section.
 
 * Author: Gavin Lyons
 
@@ -50,12 +53,13 @@ Tested
 
 Tested on following MCUs.
 The example files are setup for an UNO/NANO for the pin connections used 
-by for other MCU testing see extras/doc folder GPIO_MCU_used.txt file.
+by for other MCU testing see extras/doc folder GPIO_MCU_used.MD file.
 
 1. Arduino  UNO & NANO v3
 2. ESP8266 
 3. ESP32 
-4. STM32 "blue pill"
+4. STM32 "blue pill", Can support both I2C ports , In example files comment in #define STM32_BLUE_PILL_SETUP
+and pick which port you want. Added in Version 1.2.0.
 
 Ports
 ------------------------

examples/HelloWorld/HelloWorld.ino

@@ -5,18 +5,30 @@
  * URL: https://github.com/gavinlyonsrepo/HD44780_LCD_PCF8574
  */
 
-// Section: Included library 
+// Section: Included library
 #include "HD44780_LCD_PCF8574.h"
 
+// Section: Defines
+#define DISPLAY_DELAY_INIT 50 // mS
+// **** NOTE ::  Comment in If using STM32 bluepill ****
+//#define STM32_BLUE_PILL_SETUP
+
+
 // Section: Globals
+#ifdef STM32_BLUE_PILL_SETUP // *** STM32 Blue Pill *** 
+// Set-up Choice I2C interface 1 or 2 :: pick one and one only 
+TwoWire Wire2(1,I2C_FAST_MODE); // Use STM32 I2C1 
+//TwoWire Wire2(2,I2C_FAST_MODE); // Use STM32 I2C2 
+HD44780LCD myLCD(2, 16, 0x27, &Wire2); // LCD object.rows ,cols ,PCF8574 I2C addr, Interface)
+#else
 // myLCD(rows , cols , PCF8574 I2C address)
-HD44780LCD myLCD( 2, 16, 0x27); // instantiate a LCD object
+HD44780LCD myLCD( 2, 16, 0x27); // instantiate an object
+#endif
 
 // Section: Setup
 
-void setup() 
-{
-  delay(50);
+void setup() {
+  delay(DISPLAY_DELAY_INIT);
   myLCD.PCF8574_LCDInit(LCDCursorTypeOn);
   myLCD.PCF8574_LCDClearScreen();
   myLCD.PCF8574_LCDBackLightSet(true);
@@ -25,13 +37,11 @@ void setup()
 
 // Section: Main Loop
 
-void loop() 
-{  
+void loop() {
   char testString[] = "Hello World";
   myLCD.PCF8574_LCDSendString(testString);
-  myLCD.PCF8574_LCDSendChar('!'); // Display a single character
-  while(true){};
-
-} 
+  myLCD.PCF8574_LCDSendChar('!');  // Display a single character
+  while (true) {};
+}
 
 // EOF

examples/TestRun/TestRun.ino

@@ -20,10 +20,19 @@
 #define DISPLAY_DELAY_1 1000
 #define DISPLAY_DELAY_2 2000
 #define DISPLAY_DELAY 5000
+// **** NOTE ::  Comment in If using STM32 bluepill ****
+//#define STM32_BLUE_PILL_SETUP
 
 // Section: Globals
+#ifdef STM32_BLUE_PILL_SETUP // *** STM32 Blue Pill *** 
+// Set-up Choice I2C interface 1 or 2 :: pick one and one only 
+TwoWire Wire2(1,I2C_FAST_MODE); // Use STM32 I2C1 
+//TwoWire Wire2(2,I2C_FAST_MODE); // Use STM32 I2C2 
+HD44780LCD myLCD(2, 16, 0x27, &Wire2); // LCD object.rows ,cols ,PCF8574 I2C addr, Interface)
+#else
 // myLCD(rows , cols , PCF8574 I2C address)
 HD44780LCD myLCD( 2, 16, 0x27); // instantiate an object
+#endif
 
 // Section: Function Prototypes
 

examples/TestRun20X04/TestRun20X04.ino

@@ -20,10 +20,19 @@
 #define DISPLAY_DELAY_1 1000
 #define DISPLAY_DELAY_2 2000
 #define DISPLAY_DELAY 5000
+// **** NOTE ::  Comment in If using STM32 bluepill ****
+//#define STM32_BLUE_PILL_SETUP
 
 // Section: Globals
+#ifdef STM32_BLUE_PILL_SETUP // *** STM32 Blue Pill *** 
+// Set-up Choice I2C interface 1 or 2 :: pick one and one only 
+TwoWire Wire2(1,I2C_FAST_MODE); // Use STM32 I2C1 
+//TwoWire Wire2(2,I2C_FAST_MODE); // Use STM32 I2C2 
+HD44780LCD myLCD(4, 20, 0x27, &Wire2); // LCD object.rows ,cols ,PCF8574 I2C addr, Interface)
+#else
 // myLCD(rows , cols , PCF8574 I2C address)
 HD44780LCD myLCD( 4, 20, 0x27); // instantiate an object
+#endif
 
 // Section: Function Prototypes
 

extras/doc/CHANGELOG.md

@@ -5,4 +5,5 @@
 * version 1.1.0 April 2022
 	* Tested on 20x04 for first time and github issue 1 closed off.
 	* Example file added for 20x04 
-
+* version 1.2.0 September 2022
+	* Option added for User to pick I2C port for STM32 bluepill, github issue 2.

extras/doc/GPIO_MCU_used.md

@@ -0,0 +1,28 @@
+GPIO used in testing for I2C
+--------------------------------------
+
+UNO/NANO I2C
+
+1. A4 SDA
+2. A5 SCLK
+
+ESP8266 HARDWARE I2C
+
+3. D1 GPIO5 20 SCK
+4. D2 GPIO4 19 SDA
+
+ESP32 HARDWARE I2C
+
+5. D22 GPIO22 SCK
+6. D21 GPIO21 SDA
+
+STM32 STM32F103C8T6  "blue pill" I2C
+
+|  Pin Name | Pin | Arduino Pin | PCB Label   | Func | I2C Channel |
+|  -- | -- | -- | --   |  --  | -- |
+| PB6 | 42 | 22 | B6 | SCK | I2C1 |
+| PB7 | 43 | 23 | B7 | SDA | I2C1 |
+| PB10 | 21 | 26 | B10 | SCK | I2C2 |
+| PB11 | 22 | 27 | B11 | SDA | I2C2 |
+
+

library.properties

@@ -1,5 +1,5 @@
 name=HD44780_LCD_PCF8574
-version=1.1.0
+version=1.2.0
 author=Gavin Lyons <[email protected]>
 maintainer=Gavin Lyons <[email protected]>
 sentence=Library to Support the HD44780 LCD I2C driven by the PCF8574 controller

src/HD44780_LCD_PCF8574.cpp

@@ -4,13 +4,15 @@
 
 // Section : constructor
 
-HD44780LCD  :: HD44780LCD(uint8_t NumRow, uint8_t NumCol, uint8_t I2Caddress)
+HD44780LCD  :: HD44780LCD(uint8_t NumRow, uint8_t NumCol, uint8_t I2Caddress,TwoWire *twi)
 {
 	_NumRowsLCD = NumRow;
 	_NumColsLCD = NumCol;
 	_LCDSlaveAddresI2C  = I2Caddress;
+	  wire = twi;
 }
 
+
 // Section : Functions
 
 //  Func Desc: Send data byte to  LCD via I2C
@@ -27,9 +29,9 @@ void HD44780LCD::PCF8574_LCDSendData(unsigned char data) {
 	dataI2C[2] = dataLower | (LCD_DATA_BYTE_ON & _LCDBackLight); //enable=1 and rs =1 1101  YYYY-X-en-X-rs
 	dataI2C[3] = dataLower | (LCD_DATA_BYTE_OFF &  _LCDBackLight); //enable=0 and rs =1 1001 YYYY-X-en-X-rs
 
-	Wire.beginTransmission(_LCDSlaveAddresI2C);
-	Wire.write(dataI2C, 4) ;
-	TransmissionCode  = Wire.endTransmission();
+	wire->beginTransmission(_LCDSlaveAddresI2C);
+	wire->write(dataI2C, 4) ;
+	TransmissionCode  = wire->endTransmission();
 	if (TransmissionCode!= 0)
 	{
 		#ifdef LCD_SERIAL_DEBUG
@@ -58,9 +60,9 @@ void HD44780LCD::PCF8574_LCDSendCmd(unsigned char cmd) {
 	cmdI2C[2] = cmdLower | (LCD_CMD_BYTE_ON & _LCDBackLight); // YYYY-1100 YYYY-led-en-rw-rs ,enable=1 and rs =0
 	cmdI2C[3] = cmdLower | (LCD_CMD_BYTE_OFF & _LCDBackLight); // YYYY-1000 YYYY-led-en-rw-rs ,enable=0 and rs =0
 
-	Wire.beginTransmission(_LCDSlaveAddresI2C);
-	Wire.write(cmdI2C, 4) ;
-	TransmissionCode  = Wire.endTransmission();
+	wire->beginTransmission(_LCDSlaveAddresI2C);
+	wire->write(cmdI2C, 4) ;
+	TransmissionCode  = wire->endTransmission();
 	if (TransmissionCode!= 0)
 	{
 		#ifdef LCD_SERIAL_DEBUG
@@ -283,10 +285,11 @@ void HD44780LCD::PCF8574_LCDBackLightSet(bool OnOff)
 bool HD44780LCD::PCF8574_LCD_I2C_ON()
 {
 	uint8_t TransmissionCode = 0;
-	Wire.begin();
-	Wire.setClock(100000UL);  
-	Wire.beginTransmission(_LCDSlaveAddresI2C);
-	TransmissionCode  = Wire.endTransmission();
+
+	wire->begin();
+	//Wire.setClock(100000UL); // V 1.2.0
+	wire->beginTransmission(_LCDSlaveAddresI2C);
+	TransmissionCode  = wire->endTransmission();
 	if (TransmissionCode!= 0)
 		{
 			#ifdef LCD_SERIAL_DEBUG

src/HD44780_LCD_PCF8574.h

@@ -16,7 +16,8 @@
 #endif
 
 #include "Wire.h"
-
+
+
 #ifndef LCD_HD44780_H
 #define LCD_HD44780_H
 
@@ -92,7 +93,7 @@ typedef enum {
 
 class HD44780LCD : public Print{ 
   public:
-	HD44780LCD(uint8_t NumRow, uint8_t NumCol, uint8_t I2Caddress);
+	HD44780LCD(uint8_t NumRow, uint8_t NumCol, uint8_t I2Caddress, TwoWire *twi = &Wire);
 	~HD44780LCD(){};
 
 	void PCF8574_LCDInit (LCDCursorType_e);
@@ -130,7 +131,7 @@ class HD44780LCD : public Print{
 	uint8_t _LCDSlaveAddresI2C = 0x27 ;
 	uint8_t _NumRowsLCD = 2;
 	uint8_t _NumColsLCD = 16;
-		
+	TwoWire *wire;   
   }; // end of HD44780LCD class
 
 #endif // guard header ending