Monthly Archives: April 2013

Rehosting ARMCC for the mbed with CMSIS-DAP

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

In this posting I will look at porting the C standard library output (e.g. puts / printf ) to use a UART rather than the default ARM/Keil semihosting.

In my last post, I looked at getting basic user I/O out from a native-mbed via UART0 to a terminal emulator (e.g. Tera Term). This was driven by the fact that, currently, neither printf (via semihosting) or ITM_SendChar do not function on the mbed. Unfortunately, my solution uses a propriety API, such as init_serial0 and putchar0, […]

Posted in ARM, C/C++ Programming, CMSIS, Cortex | 3 Comments

User I/O from mbed with CMSIS-DAP

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

Following on from my last posting regarding using native C/C++ on the mbed I have found that I currently cannot get output via the standard CMSIS ITM_SendChar function as used in the Cortex-M hard fault handler (I am currently in dialog with the guys at ARM trying to resolve this).

In the standard mbed environment, the mbed can communicate with a host PC through a “USB Virtual Serial Port” over the same USB cable that is used for programming using printf(), e.g.

#include “mbed.h”
int […]

Posted in ARM, C/C++ Programming, CMSIS, Cortex | 3 Comments

Native C/C++ Application development for the mbed using CMSIS-DAP

Niall Cooling

Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.

If you have been following the Feabhas blog for some time, you may remember that in April of last year I posted about my experiences of using the MQTT protocol. The demonstration code was ran the ARM Cortex-M3 based mbed platform.

For those that are not familiar with the mbed, it is an “Arduino-like” development platform for small microcontroller embedded systems. The variant I’m using is built using an NXP LPC1768 Cortex-M3 device, which offers a plethora of connection options, ranging […]

Posted in ARM, C/C++ Programming, CMSIS, Cortex | Tagged , , , , , , , | 2 Comments