Electrum Examples

From Manuals

Revision as of 19:59, 4 January 2011

These code examples will help you get started with your user space applications on the Micromint Electrum. Our support staff (support@micromint.com) can assist you with questions on specific functions.

Since Linux implements virtual memory, there is no direct access to processor registers. One popular alternative to access processor registers in user space is to open a handle to /dev/mem and then use mmap() to map a virtual memory address to a physical memory address. These examples use this approach to access processor registers. The peripheral code is adapted from the Atmel AT91 Softpack library.

The default compiler is the EmDebian cross-compiler. To choose another compiler set the COMPILER variable on the Makefile.

#   On-board gcc       COMPILER=gcc
#   EmDebian (default) COMPILER=emdebian
#   Sourcery G++ Lite  COMPILER=sourcerygxx

Electrum Examples

Example	Description	Electrum 100
adc	Test processor ADCs
blinky	Blinks user LED
button	Uses button to set LED
dac_spi	Test SPI DACs (requires I/O option)
hello	Simple console output
littlec	Little C interpreter
minibasic	Simple BASIC interpreter

Interrupt handlers and other applications that require full control of timing or preemption should implement device drivers or modules in kernel space. The Linux Device Drivers (LDD) book covers most concepts required for device driver development. Note that a free online version of the LDD book is available. The kernel source code also contains device drivers for Atmel processors.