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PicoMite - MMBasic

How to use a Raspberry Pi Pico Running the MMBasic Interpreter
The PicoMite firmware is totally free to download and use.
Link to PicoMite  https://geoffg.net/picomite.html
Link to User Manual: https://geoffg.net/Downloads/picomite/PicoMite_User_Manual.pdf


Microsoft BASIC compatible implementation of the BASIC language with a built in program editor. 
Supports floating point, integer and string variables, arrays, long variable names. 

Using MMBasic with the PICO can control the I/O pins and detect digital inputs and drive output pins low or high.
Use communications protocols such as I2C or SPI to get data from a variety of sensors.

Loading the Firmware

Loading the PicoMite Firmware to the Raspberry Pi Pico board.
The Raspberry Pi Pico comes with its own built in firmware loader that is easy to use. 
Just follow these steps:
1. Download the PicoMite firmware from http://geoffg.net/picomite.html and unzip the file. 
2. Identify the firmware which should be named something like “PicoMiteV5.xx.xx.uf2”.
3. Using a USB cable plug the Raspberry Pi Pico into your computer (Windows, Linux or Mac) while
holding down the white BOOTSEL button on the Raspberry Pi Pico.
4. The Raspberry Pi Pico should connect to your computer and create a virtual drive (the same as if you had
plugged in a USB memory stick) called “RPI-RP2”. 
This drive will contain two files which you can ignore.
5. Copy the firmware file (with the extension .uf2) to this virtual drive.
6. When the copy has completed the Raspberry Pi Pico will restart and create a virtual serial port on your computer. 
The LED on the Raspberry Pi Pico will blink slowly indicating that the PicoMite firmware with MMBasic is now running

Set up Virtual Serial Port for Terminal Emulator

In Windows start Device Manager and check the "Ports (COM & LPT)" entry for a new COM port.
The terminal emulator that you use should support VT100 emulation as that is what the editor built into the PicoMite expects.   
If you are using Tera Term do not set a delay between character.
Using Putty set the backspace key to generate the backspace character.
The PicoMite ignores the baud rate setting so it can be set to any speed 
(other than 1200 baud which puts the Pico into firmware upgrade mode)
I used the following settings with Putty
Comm Port9 - Connection Serial  - Baud rate 38400 - 8 bits - No parity - Backspace Key = (CTRL H) 

Color Coded Editor Display

To Turn on.  Type at the command prompt: OPTION COLOURCODE ON 
To turn off. Type at the command prompt: OPTION COLOURCODE OFF

User Commands and Program Input

ESC         This will cause the editor to abandon all changes and return to the command prompt with the program memory unchanged. 
F1: SAVE    This will save the program to program memory and return to the command prompt.
F2: RUN     This will save the program to program memory and immediately run it.
F3: FIND    This will prompt for the text that you want to search for. When you press enter the cursor will
            be placed at the start of the first entry found. 
F4: CUT     Will copy the marked text to the clipboard and remove it from the program.
F5: COPY    Will just copy the marked text to the clipboard.
DELETE      Will delete the marked text leaving the clipboard unchanged.

Writing a basic Program

At the command prompt type EDIT followed by the ENTER key.
The editor should start up and you can enter this line: PRINT "Hello World"
Press the F1 key in your terminal emulator (or CTRL-Q which will do the same thing). This tells the
editor to save your program and exit to the command prompt.
At the command prompt type RUN followed by the ENTER key.
You should see the message: Hello World

Set date and time

Setting the date June 8 2022
Setting time 2:30 PM 
At the command prompt type the following:
time$ = "14:30:00"
date$ = "06/08/2022"
print date$ " - " time$

First Program

At the command prompt type EDIT followed by the ENTER key.
Enter the following:
10 For a = 1 To 5
20 Print "Microrusty.com"
30 Next a

At the command prompt type RUN followed by the ENTER key or use F2 key.

Sample program

Print " Rusty Cain Microrusty 2022    "
Print " "
Print "------ System Info -----------"
Print "     "
Print "Pico Board ID# " MM.Info(ID)            'System Board information
Print "Pico CPU Speed " MM.Info(cpuspeed)      'Read CPU Speed
celsius =Pin(temp)                             'Read CPU Temp
Ctemp = Cint(celsius)                          'Round up Celsius number 
fahrenheit = celsius * 1.8 + 32                'Convert Celsius to Fahrenheit
Ftemp =Cint(fahrenheit)                        'Round up Fahrenheit number 
Print "Pico CPU Temp " Ctemp " Celsius" Ftemp " Fahrenheit"
Print "PicoMite Version" MM.Info(version)      'PicoMite Version
Print " "
Print "------ System Memory ---------"
Memory                                         'Show Memory
Print "------------------------------"
Print " "
Print "      Time          Date   "
Print "  ---------------------------"
Print "  | "  Time$ "  |  " Date$" |"
Print "  ---------------------------"
Print "                           "

Store Program in Flash

To manage these numbered locations in flash you can use the following commands 
(note that in the following n  is a number from 1 to 7):
FLASH SAVE n        Save the program in RAM to the flash location n.
FLASH LOAD n        Load a program from flash location n into RAM.
FLASH RUN n         Run a program from flash location n, clears all variables but does not erase
                          or change the program held in the main program memory.
FLASH LIST          Display a list of all flash locations including the first line of the program.
FLASH LIST n [,all] Lists the program held in location n. Use FLASH LIST n,ALL to list without page breaks
FLASH ERASE n       Erase flash location n.
FLASH ERASE ALL     Erase all flash locations.
FLASH CHAIN n       Load and run a program from flash location n, leaving all variables intact.
FLASH OVERWRITE n   Erase flash location n and then save the program in RAM to that location.

At the command prompt type : flash save 2
At the command prompt type : flash list

 Slot 1 in use: "Microrusty"
 Slot 2 in use: "System-Info"
 Slot 3 available
 Slot 4 available
 Slot 5 available
 Slot 6 available
 Slot 7 available

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