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- #Pbp3 set location of hex file how to#
- #Pbp3 set location of hex file pro#
- #Pbp3 set location of hex file code#
Darrel had some GREAT techniques but he must have been distracted because theĭATA portion of the 4 bits is on the UPPER side of the nibble and the COMMAND On the actual module and thus the I2C address is indeed $4E.Ģ. The schematic shows the A0,A1,A2 lines being tied to ground. Was handy to be able to test certain portions, and delete others.
#Pbp3 set location of hex file code#
Because Darrel's code is so well documented, it I haven't been ignoring you all, it actually took me this long to get
![pbp3 set location of hex file pbp3 set location of hex file](https://files.rcsb.org/pub/pdb/validation_reports/pb/3pbs/3pbs_multipercentile_validation.png)
#Pbp3 set location of hex file how to#
Taking the time to show me how to do this. Overall, WOW! Some very kool techniques in there that I haven't tried yet GOTO MainOh, and you mentioned that you are using PBP 3.0.5.1. (Jumping Jacks)-ĪRRAYWRITE LCD_Buff,:LCD_WriteBuff ' #0ĪRRAYWRITE LCD_Buff,:LCD_WriteBuff ' #1ĪRRAYWRITE LCD_Buff,:LCD_WriteBuff ' #2ĬustChar = LoopCount//3 Jumping Jacks Sequence INCLUDE "LCD_PCF8574.pbp" Include LCD module for PCF8574ĪRRAYWRITE LCD_Buff, : LCD_WriteBuff LCD_Addr CON $40 A0, A1, A2 tied to ground _config _CONFIG2, _WRT_OFF & _PLLEN_ON & _STVREN_ON & _BORV_19 & _LVP_OFF _config _CONFIG1, _FOSC_INTOSC & _WDTE_ON & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF Description : Uses PCF8574 Port expander to interface with HD44780 LCD
#Pbp3 set location of hex file pro#
Compiler : PicBasic Pro 3.0.6.x or higher The include is not processor specific, so all you need to change is the test program for a different chip. I actually didn't notice you posted your code before I wrote mine today.
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Put the include file in your PBP3 folder (the one with PBPX.exe in it). The heart of the program is contained in the include file " LCD_PCF8574.pbp" (attached below). There's also an example of using Custom Characters (stick man doing jumping jacks). So the test program below (Test_LCD_PCF8574.pbp) shows how to use the ARRAYWRITE command to compose data derived from a combination of text and any of the DEC, HEX, BIN etc. Sending one byte at a time can be difficult, if not extremely annoying. The HD44780 clocks in the data on the Falling edge of the E clk.Įxcept during the initialization, where only one nibble is used at a time until the mode is set to 4-bit. The E line then goes low the second time, nothing else changes the second time. The E line goes HIGH when sending the nibble the first time. There is no optional address for the PCF8574. It will only be $4E if you have connected the PCF8574's A0,A1 and A2 to VDD. With the schematic you supplied, the slave address (control byte) is $40. It's a circuit that can be used with any microcontroller, there's nothing specific to that language.īut to use the circuit, you need to have the proper sequence. Geez, those Arduino people think the world revolves around them. I2cwrite SDA,SCL,LCDAddr,LCDNibble + LCDE ' toggle enable to 1? I2cwrite SDA,SCL,LCDAddr,LCDNibble ' enable is 0 Should I send the %0100 first or the %0001 first? In other words: In 4-bit mode, let's say I want to sent the letter "A" which is $41. I am confused about the optional address parameter and I am probably getting the command vs data mode messed up when talking to the LCD Panel. I am not using the I2C Write command properly. Now whether or not I am sending a zero when I should be sending a one is a point of confusion.Ĭonfig: PIC16F886, pickit2, winxp, pbp 3.0.5.1, 20x4 LCD module, PCF8574 I seem to be sending the right pattern of commands. I have connected the PCF8574 to simple LEDs (cathode connection to PCF, other side to 220 resistors thence to +5V. Contrast has been varied to verify I am not missing the text. I2C lines are pulled up with 4k7 resistors.
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I have the right I2C address which is $4E). I can successfully turn on and off the backlight using the PCF8574 which means that I am able to talk to the module (i.e. The LCD panel works because I can write to it successfully using your normal LCD routines with 7 wires. The PCF module utilizes the 4bit mode on the LCD which further complicates things. I just can't seem to initialize the LCD nor send data to it. I can successfully turn on and off the backlight which means that I am able to talk to the module successfully. My project is going to eventually have a keypad, leds a piezo etc and pins are at a premium. These are neat little modules that sell for under $2 and turn an LCD into an I2C LCD. I am trying to send data to a 20x4 LCD using the I2C protocol and a PCF8574 module (schematic attached). PBP3 has wonderful LCD routines but I need to utilize the I2C protocol to save pins.