For those of you who were asking, the current iteration of the Maple prototype is using an STM32 ARM Cortex-M3 processor with 256KB 128K flash memory, 8KB 20KB of RAM.
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This entry was posted by drews on Wednesday, August 26th, 2009 at 11:46 pm.
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on August 27, 2009 at 11:50 am
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Could this be used to create a timer accurate to nanoseconds?
on August 28, 2009 at 12:54 pm
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well, since the clock on the Cortex runs at 72MHz, the highest resolution you can get is approximately 1/(72MHz), or about 15ns. There might be some fancy tricks you can play to get this down by a factor of two or so, but not down to single nanosecond precision. Keep in mind, this is assuming you do nothing else with the processor but look at the clock
on September 2, 2009 at 2:52 am
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May I ask what you’re thinking about using a timer accurate to nanoseconds for? Sounds yummy.
on August 30, 2009 at 6:37 am
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I assume you mean STM32F107RC, which has 256KB flash and 64K RAM, or do you mean that there is 8KB RAM left once the USB and Ethernet are working?
on August 31, 2009 at 3:22 pm
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Those numbers were typos. The current board equips the stm32f103rbt6, with 128KB flash program memory and 20KB of on die SRAM. We intend to offer all flavors of the stmf103x, which reach 512KB of flash and 64KB SRAM memories. We also have a handful of 105’s around the office which might make an appearance on some flavor of Maple. Thanks for pointing out the error!
on September 6, 2009 at 8:41 am
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Are you using just ports A and C for the Arduino ports (PC0-5 for analog,PCA0-13 + PC6,7 for digital ports. That would maximize the other ports for alternate usage.
The reason I ask is because we are working on something related with stm32x and Arduino backward compatibility, I’m sure we could benefit from co-operation as our project is also OpenSource.
Al
regards
Al