MAX32625PICO Programmable Interface Controller
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Table of Contents
Overview¶
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The MAX32625PICO is a multifaceted development tool. Not only is this a compact, full featured CMSIS-DAP debug probe, it is also a very capable development board.
The MAX32625PICO comes preloaded with DAPLink code so that it can be used as a programmer/debugger right out of the box. In addition to the standard DAPLink adapter features, this board includes a few enhancements. Embedded through the same 10 pin Cortex SWD connector, it adds support for a virtual UART and 1-wire board identification. Another differentiating feature is the adaptable signal voltage. The board uses the voltage provided at the VCC pin on the SWD header to set the signal level used by the adapter. This allows the MAX32625PICO to interface to any system with 1.8V to 3.3V signaling.
The board is also very useful as a development board all by itself. The castellated pads along the sides are conveniently arranged in a dual row set at 100mil pitch to be compatible with breadboards, and there are no components on the back side, so it can be surface-mounted as module on another board. This is an easy, compact way to get a useful set of resources from a micro USB connector including: +5V, +3.3V, +1.8V supplies, SPI, I2C, UART and 1-Wire serial interfaces, 14 GPIO and 2 analog inputs.
Wether you are looking for a very capable CMSIS-DAP debugger, or a compact embeddable development platform, the MAX32625PICO is a great multi-tool to have at your disposal.
The pinout diagrams above shows the commonly used interfaces and their locations. Note that all the numbered pins (PX_X) can also be used as DigitalIn and DigitalOut interfaces.
Features¶
- MAX32625 Ultra-Low Power Microcontroller
- High performance ARM® Cortex™-M4F Core
- 96MHz, 160KB SRAM, 512KB Flash
- Ultra-Low Power for Battery Applications
- 106µA/MHz Active Executing from Flash
- 600nA Low Power Mode with RTC Enabled
- 2.56µW Ultra-Low Power Data Retention Mode
- 5µs Fast Wakeup to 96MHz
- Peripherals
- USB 2.0 Full-Speed Device
- SPI, I2C, UART, 1-Wire Serial Interfaces
- RTC, PWM, AES
- Four-Input 10-Bit ADC
- 40 Dual Voltage GPIO
- Tiny 63-Ball 3.07mm X 3.87mm WLP
- MAX14750 Wearable PMIC
- 3.3V Micro Iq Buck-Boost
- 1.8V Micro Iq Buck Regulator
- 1.2V Micro Iq Linear Regulator
- Power Load Switch
- Expansion Connections
- Breadboard compatible headers
- Micro USB Connector
- Integrated Peripherals
- RGB Indicator LED
- User push-button
Firmware Updates¶
Like most DAPLink boards, the MAX32625PICO board comes with a bootloader installed to allow for firmware updates over USB. The same procedure is used wether you are updating the DAPLink code or applying your own custom image. To activate the bootloader, hold down the button while connecting to the computer with the image to be installed. When the bootloader is activated, a drive named 'MAINTENANCE' will appear. Simply drag-n-drop the binary image onto the MAINTENANCE drive to program the image into the board.
See the MAX32625PICO Firmware Update wiki page for more details and links to various firmware images.
Getting Started with mbed¶
1. Connect your microcontroller to a PC¶
Use the USB lead to connect your mbed to a PC. The status light will come on, indicating it has power. After a few seconds of activity, the PC will recognise the mbed Microcontroller as a standard USB drive.
Windows XP example | Mac OS X example |
2. Click the MBED.HTM link to get logged in¶
Go to the new USB Drive, and click MBED.HTM to open it in a web browser.
If you do not have an mbed account, choose 'Signup', and create your mbed Account. Otherwise, log in with your normal username and password.
This will give you access to the website, tools, libraries and documentation.
PC Configuration¶
Your mbed Microcontroller can appear on your computer as a serial port. On Mac and Linux, this will happen by default. For Windows, you need to install a driver:
Windows
See Windows-serial-configuration for full details about setting up Windows for serial communication with your mbed Microcontroller
From a host PC to communicate with mbed you will need a terminal application
. This allows the mbed Microcontroller to print to your PC screen, and for you to send characters back to your mbed.
- Terminals - Using Terminal applications to communicate between the Host PC and the mbed Micrcontroller
Some terminal programs (e.g. TeraTerm) list the available serial ports by name. However, if you do need to know the identity of the serial port so that you can attach a terminal or an application to it:
Windows | Mac | Linux |
Find the identity of the COM port by opening 'Device Manager'. To do this navigate 'Start -> Control Panel -> System -> Hardware -> Device Manager'. | To find the device name under Mac OS X, use the command 'ls /dev/tty.usbmodem*' | To find the device name under Linux, use the command 'ls /dev/ttyACM*' |
Downloading A program¶
1. Save a program binary (.bin) to the Platform¶
Hold down the button while connecting the board to your computers USB port. A drive named 'MAINTENANCE' will appear.
Download the DAPLink binary image:
Save the program binary file to your MAINTENANCE Microcontroller Disk, just like you would with a normal USB disk. The Status LED will flash as the PC writes the file to the Microcontroller disk. The file is now consumed.
2. Disconnect and reconnect the board¶
After the board has been disconnected and reconnected, the board will appear as a drive named 'DAPLINK', and is now ready to use for programming or debugging another board.
Example Programs¶
PICO_board_demo
Demo for MAX32625PICO board library
Last commit 22 Aug 2018 by
PICO_USB_I2C_SPI
I2C/SPI/GPIO example for MAX32625PICO board
Last commit 22 Aug 2018 by
Where Next¶
Follow the guide to creating your own programs using the online compiler
Technical Reference¶
Information
Like most DAPLink boards, the MAX32625PICO board comes with a bootloader installed to allow for firmware updates over USB. The same procedure is used wether you are updating the DAPLink code or applying your own custom image. To activate the bootloader, hold down the button while connecting to the computer with the image to be installed. When the bootloader is activated, a drive named 'MAINTENANCE' will appear. Simply drag-n-drop the binary image onto the MAINTENANCE drive to program the image into the board.
Craps lay bet strategy. See the MAX32625PICO Firmware Update wiki page for more details and links to various firmware images.
Power¶
- USB powered or 2.5v - 5.5v on 5V pin
- Current (active): < 10 mA
- Current (sleep): < 0.01 mA
- 3.3v & 1.8V regulated outputs to power peripherals
- 5.0v from USB available on 5V (only available when USB is connected)
Product Pages¶
PCB CAD Files¶
Updating and Restoring the DAPLink Image¶
- See the MAX32625PICO Firmware Update wiki page for more details and links to various firmware images.
Information
The factory bootloader image can be reloaded or replaced with the use of an appropriate SWD debugger setup. For example a second MAX32625PICO fitted with a Tag-Connect TC2050-IDC-NL-050-ALL cable. The factory bootloader occupies 64KiB of flash from address 0x00000000 through 0x0000FFFF.
Known issues¶
Debugging and running Greentea tests¶
By default, the MAX32625PICO board runs a bootloader to receive a binary over USB, hence it can't be used straight away with Greentea (see issue #14492)
To test the MAX32625PICO you need two boards and a Tag-Connect cable. Here is an explanation from MAX32625PICO datasheet.
In addition to the preinstalled bootloader, the SWD signals are available at surface pads on the back side of the board, allowing the board to be programmed or debugged with the TC2050 series of cable adapters from Tag-Connect (such as the TC2050-IDC-NL-050-ALL). The surface pads are hidden if the board is permanently mounted to another board. The suggested footprints provided for using the MAX3265PICO as a module include two options for exposing the SWD signals when mounted:
- Connect to the SWD signals with the edge pads provided.
- Add the specified cutout to the board to expose the tag-connect TC2050 footprint
Please follow these steps after completing connections;
- Download max32625pico_max32625pico.bin file from firmware updates page
- Load it to your DAPLink MAX32625PICO board
- And power up your DUT over USB
Greentea Test Binaries
Default linker script has bootloader aligned memory map for MAX32625PICO. So before running Greentea test command, please update MAX32625PICO
field in mbed-ostargetstargets.json file as shown below.
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This document provides instructions for using the Unix text editor Pico, a command-based text editor, on the ITS Login Service (login.itd.umich.edu).
Opening Pico
Connect to the ITS Login Service (login.itd.umich.edu) using a secure system.
Windows: Use PuTTY software. For information about obtaining and using PuTTY, see Use PuTTY to Connect to Host Computers [Windows] .
Mac OS X: Mac OS X comes with SSH software called Terminal. Open the Applications folder, then the Utilities folder to find it. Open Terminal and type this command:
ssh login.itd.umich.eduLog in with your uniqname and UMICH password.
At the % prompt, type pico and press ENTER, or RETURN.
Pico opens a buffer (temporary storage for any text you type). https://torrent-central.mystrikingly.com/blog/survive-or-die-mac-os. Start typing text or use any of Pico's commands.
Commands Use the Control Key
You issue most commands in Pico by holding down CONTROL and typing a letter. A caret (^) is used to indicate the Control key. To issue the Get Help command (^G), for example, hold down CONTROL and type g.
Marking, Cutting, and Pasting
The mouse is not used to select text in Pico. Mark the text to cut instead. The command for marking text is ^^. The first ^ indicates that you should hold down CONTROL. The second ^ means to type a caret (Shift-6).
The mark feature (^^) allows you to mark any segment of text, cut it out (^K), move the cursor, and paste the text (^U) in the new location.
Commands That Move Your Cursor
Command | What the Command Lets You Do |
---|---|
Arrow keys | Move cursor up, down, to the right, and to the left. |
Delete/ Backspace key | Move cursor back one space. |
^A | Move cursor to beginning of line. |
^B | Move cursor back one character. |
^E | Move cursor to end of line. |
^F | Move cursor forward one character. |
^N | Move cursor to next line. |
^P | Move cursor to previous line. |
^V | Move cursor forward a page of text. |
^Y | Move cursor backward a page of text. |
^-space | Move cursor to next word. |
Other Commands
Nair Pico Mac Os X
Command | What the Command Lets You Do |
---|---|
^C | Report current cursor position. |
^D | Delete the character at the cursor position. |
^G | Display the Pico help file. |
^H | Delete previous character. |
^I | Insert a tab at the current cursor position. |
^J | Reformat the text in the paragraph the cursor is on so that it is left-justified and the right margin is ragged (a paragraph is separated by one blank line). Useful when you are editing a paragraph and the lines become uneven. |
^K | Cut marked text or current line. |
^L | Redraw screen. |
^O | Output current buffer to file, saving it. |
^R | Insert text from an existing file. Pico prompts you for the name of a file in your IFS home directory. You can then type ^T to see a list of files in your home directory. Use the arrow keys to navigate to the file you want, and then press Return to read in the selected file. |
^T | Check the spelling in the file you are composing. You will be prompted at the bottom of the screen with each misspelled word. You can correct the word, then press Return to change it in the text. If you don't want to change the spelling of a word flagged by the spell checker, press Return to continue the spell check. If a word is misspelled more than once, you will be prompted to confirm the correction of each occurrence. |
^U | Undelete the last line, series of lines, or marked block you deleted. Using Mark (^^), Cut (^K), and Undelete (^U) is a convenient way to move text to a new location in your file. Also, ^U can be used to 'unjustify' the last justification. |
^W | Search the file for a string of characters. The cursor stops right before the first occurrence of the string. The search will wrap to the beginning of the file when it no longer finds matching strings. To search for the same string a second time, press ^W to begin search and then press Return to accept the previous search string shown in square brackets instead of entering a new one. |
^X | Exit Pico. You'll be prompted whether to save the buffer (your changes). |
^^ | Mark cursor position at the beginning of the selected text. Used to set a mark and then perform a delete/move operation on a block of text. |
Exiting Pico
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Use the Exit command (^X) to exit Pico. You'll be prompted to indicate whether you want to save your changes.
At the % prompt, type logout and press ENTER or RETURN to log out of the ITS Login Service.
Quit or Exit your secure connection software.