Electrum Examples
From Manuals
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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. | 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 default compiler is 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 | ||
{| border="1" cellpadding="2" cellspacing="2" | {| border="1" cellpadding="2" cellspacing="2" | ||
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|align="center" | [[Image:checkmark.gif]] | |align="center" | [[Image:checkmark.gif]] | ||
|} | |} | ||
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| + | Applications that require full control of timing or preemption should implement device drivers or modules in kernel space. The [http://wiki.micromint.com/index.php/ARM9_Books Linux Device Drivers (LDD) book] covers most concepts required for device driver development. Note that a [http://lwn.net/Kernel/LDD3/ free online version of the LDD book] is available. The [http://wiki.micromint.com/index.php/Electrum_Documentation#Software_Updates kernel source code] also contains device drivers for Atmel processors. | ||
Revision as of 20:14, 3 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 default compiler is 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
| Example | Description | Electrum 100 |
|---|---|---|
| hello | Simple console output | 
|
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.