mbed

It would be nice to make it possible to download all documentation in a set of pdf-files at this page

This is a good idea.

Christian, sorry for the delay in responding. I want to use the USB interface directly on the LPC1768 ic. Refered to in the data sheet (Rev. 6 — 25 August 2010) for the LPC1768 in chapter 7.12. The pins are brought out on pins 31 & 32 of the 40 pin header.

My aim is to use the mbed platform for applications using the LPC1768 or similar devices without the support peripherals on the mbed pcb. I believe that the USB interface on the mbed is realised using the serial port and an external RS232 to USB converter.

I just need to know if this interface has library support, if not will it be supported in the near future?

I appreciate your assistance.

Les Cronin

Les: Search for BlueUSB and you shall find. :-)

Hi,can anyone please tell me how can I register a mbed using different user name and password which has been registered before and details is not known to me.

Compiler and standard library documentation

Hi, while working with RFID tags I needed some information:
1. What is the size of "long" and "long long"? This information is usually stored in macros LONG_MAX and LONG_LONG_MAX in C standard header limits.h
2. Details of C standard library functions strtol() and strtoll()? Particularly error reporting, like the use of "errno" which it seems is NOT available in the mbed system.

In *nix systems either man pages (for standard functions) or examining the header file sources (/usr/include/...) gets me the answers. With locally installed compilers/tool-chain this information is available locally, most probably installed with the compiler and/or development system (binutils).

Is this information available in this environment? i.e. On this web site?
How are standard libraries "included" into program units?
How is this different from the familiar gcc/g++?

The link to ARM RVDS from the /handbook/mbed-Compiler page is just Marketing/Sales info from arm.com. What is really needed is online free (as in beer) access to the User Guides etc. Also, information regarding the output from the compiler that depends upon installation details and any runtime options passed to to the compiler executing on your web site would also be needed to complete the picture.

This type of information is only infrequently needed, but when it is, it is extremely frustrating not to be able to find it.

(And, I do this type of work for a living. So, I guess I have high expectations).

Rick, if you want discussion, you should use the forum. That said, check these links.

ARM® Compiler toolchain Compiler Reference Version 4.1

Basic data types

Are the LPC1768's SSP0 and SSP1 functions (and the associated interrupt and DMA access) formalized anywhere in the mBed site's libraries? Are the device-specific constants and functions (e.g. myled, led(LED1) of the example program) listed anywhere? Thank you.

Hi Whit,

The SSP0/1 are what drive the SPI library interfaces (although they don't use DMA), and LED1-4 are pin enumerations for the onboard LEDs, available to both DigitalOut and PwmOut

Dear Simon, Thank you for your message.

Is there any way to access the additional underlying LPC1768 SPP0 and SPP1 functionality via the existing mBed libraries? Or if not, is there anything stopping me from writing from a C program to the underlying registers to access the SPP functionality? My goal is to capture data from some high speed ADCs.

Is there any central documentation location which illustrates definitions or availability of functions and constants such as led(), myled, LED1? I apologize for asking if I am overlooking some fundamental documentation source.

Hi everyone,

I am new to Mbed NXP LPC1768 and need to design basic develop pcb to house the mbed module in order to provide simple input/output features,(switches, LEDs, LCD.

Can anyone please help on this.

It really seems like the type/object PinName should be documented here in the Library Reference Section, as it's used by almost every other documented object('s constructor).

Hi everyone, Please can someone help me to read data from A/D converter TC72 using MBED. I used following code which did not work.

cs=0; spi.write(0x8F); int temp = spi.write(0x00); pc.printf("TEMP = 0x%X\n",temp); cs=1

I hve another compiler but its question dat how can I changing the files from *.c to the *.bin ? If you answering to mee you helped to mee becaus I can not connecting to the Internet every time . farbodjam@gmail.com

Hi there! I am quit new to this kind of development. Just been trying to read a rotary encoder, but when loading the demo program it complains at compile-time that the QEI.h file cannot be found. How and where can I find it?

Regards, Willem Braat

Sorry... sorry... Found it! Importing the library makes life a lot easier... :-))

regards, Willem

My MBED is now wiped clean. A long story. In the end, the button push would not make the last compile active. Has been working perfectly for a couple of weeks. Only one program was involved. I worked on it for hours. Then in frustration I did a dumb thing: format, thinking I would find a way to restore all, at least the communication stack. Of course now, nothing works. Help! Don

Try the steps from this page.

Thanks, Igor The page you referenced is great to know about. Somehow this morning, mbed came back to life. I didn't any of the steps. Maybe because I tried the new beta of mbed.org and then returned back. I will bookmark the help page for any future problems. Don

Can multiple device classes be used at the same time.. I.e. USBJoystick and HID ?

[17:59] <arslan> hi [17:59] <arslan> i am a very new user of mbed [17:59] <arslan> i wanted to use pwm function [18:02] <arslan> so, i cant really figure out how to set the pwm to be 21Mhz (86us). And for testing, how to use the read function to check the value of the pwm being outputted. The problem is that i do not know the command to print it on the terminal