zhz

В версии 6.50.5 баг с оптимизацией вроде бы исправили.

Atmel SAM3X/A 8 PWM

К вопросу об углах: http://www.ultracad.com/articles/90deg.pdf " Conclusions: The TDR data do not show any measurable reflections from either 45 or 90 corners in microstrip traces. In theory, there is a change in Zo caused by a corner, but the effect is not sufficient to be resolvable with a 17 ps rise-time pulse. The radiated emission measurements (up to 1.3 GHz.) do not show an increase for 90 corners, compared to 45 corners, that is larger than measurement uncertainty. All of the trace geometries measured produced radiated emissions that were 35-50 dB below the emissions of a 3-cm long monopole antenna and only slightly above those from a straight trace with no corners. For most circuit boards it is expected that discontinuities encountered at IC packages, connectors, and vias will produce much larger reflection or radiation effects than either 45 or 90 corners. "

Andrew N. Sloss, Dominic Symes, Chris Wright ARM System Developer’s Guide. Designing and Optimizing System Software. 7.4 Square Roots 7.4.1 Square Root by Trial Subtraction ... following optimized assembly to implement the preceding algorithm in only 50 cycles including the return. ... 7.4.2 Square Root by Newton-Raphson Iteration ... It uses a table lookup followed by two Newton-Raphson iterations and is accurate to a maximum error of 2**-29. On an ARM9E the code takes 34 cycles including the return....

А Atmel его знает :) Видимо контроллер flash глючит при переходных процессах. Во всяком случае мне помогло. Угу. Только я reset по BOD не включал.

Включи BOD

http://electronix.ru/forum/index.php?showt...mp;#entry471988

версия 10.3 ? Возьми v10.2.1

Вообще-то есть :) http://focus.ti.com/lit/an/spraav1b/spraav1b.pdf page 10-11, 23-24 "the trace width exiting the BGA pad is much too large. In this case the trace acts as a heatsink during reflow" Я не сторонник тонких проводников питания - совсем наоборот :). Но надо знать меру.

Changes between V6.0.5 and V6.1.0 released October 6 2010 + Added xTaskGetTickCountFromISR() function. + Modified vTaskSuspend() to allow tasks that have just been created to be immediately suspended even when the kernel has not been started. This allows them to effectively start in the Suspended state - a feature that has been asked for on numerous occasions to assist with initialisation procedures. + Added ports for the Renesas RX62N using IAR, GCC and Renesas tool suites. + Added a STM32F103 demo application that uses the Rowley tools. + Under specific conditions xFreeBytesRemaining within heap_2.c could end up with an incorrect value. This has been fixed. + xTaskCreateGeneric() has a parameter that can be used to pass the handle of the task just created out to the calling task. The assignment to this parameter has been moved to ensure it is assigned prior to the newly created having any possibility of executing. This takes into account the case where the assignment is made to a global variable that is accessed by the newly created task. + Fixed some build time compiler warnings in various FreeTCPIP (based on uIP) files. + Fixed some build time compiler warnings in Demo/Common/Minimal/IntQueue.c.

Отключить опцию: Route/Autorouters.../Specctra/Command Line.../Quit when done

В книжке "ARM System Developer’s Guide. Designing and Optimizing System Software" есть глава по DSP с примерами и оценкой производительности.

Кстати :) Atmel Opens New Research and Development Center in Taiwan http://www.atmel.com/dyn/corporate/view_de...ng_1-19-10.html

Кстати на сайте Атмела появился апнот: "Signal Integrity and Power Integrity Analysis around the SDRAM Bus Activity Using an AT91SAM9260 Mic Application Note" http://www.atmel.com/dyn/resources/prod_do...nts/doc6386.pdf Там и примеры разводок есть.

Changes between V5.2.0 and V5.3.0 released June 1st 2009 Main changes: + Added new (optional) feature that gathers statistics on the amount of CPU time used by each task. + Added a new demo application for the Atmel AT91SAM3U Cortex-M3 based microcontroller. + Added a new demo application for the NXP LPC1766 Cortex-M3 based microcontroller. + Added a contributed port/demo that allows FreeRTOS to be 'simulated' in a Linux environment. Minor changes: + Updated the Stellaris uIP WEB server demos to include the new run time statistics gathering feature - and include a served WEB page that presents the information in a tabular format. + Added in the lwIP port layer for the Coldfire MCF52259. + Updated the CrossWorks LPC2368 WEB server to include an image in the served content. + Changed some of the timing in the initialisation of the LPC2368 MAC to permit its use on all part revisions. + Minor modifications to the core uIP code to remove some compiler warnings. + Added xTaskGetApplicationTaskTag() function and updated the OpenWatcom demo to make use of the new function. + Added contributed demos for AVR32 AP7000, STM32 Primer 2 and STM32 using Rowley Crossworks. + Heap_1.c and Heap_2.c used to define structures for the purpose of data alignment. These have been converted to unions to save a few bytes of RAM that would otherwise be wasted. + Remove the call to strncpy() used to copy the task name into the TCB when the maximum task name is configured to be 1 byte long.