Hi Eric.
Thank you very much for you quick response.
I guess I need to dig up. I'm using defaults...
Anyway, I assume the default configurations you refer to are not set to
about 20 times lower than max possible.
20 is the factor of improvement I'm looking for (at least!).
I hope I'm not chasing pavements here...
On Tue, Jan 1, 2013 at 5:32 AM, Eric Decker <cire...@gmail.com> wrote:
>
> How fast are you clocking the 1611 cpu?
>
> How fast are you clocking the SPI feeding the SD card?
>
> That will tell you the max theoretical rate you can transfer data.
>
> The high data rates to the SD assume the parallel 4 bit wide SD protocol
> rather than the SPI single bit stream that is probably used on the Shimmer
> or on my cards.
>
>
> On Mon, Dec 31, 2012 at 2:55 PM, Avishay Meron <
> avishay.me...@mail.huji.ac.il> wrote:
>
>> Hi all.
>> Searching google and the mailing list, I haven't found an explicit answer
>> to my problem. Here goes:
>> I'm trying to test SD logging max write speed on a shimmer2r. I've tried
>> using the FatFS but got unsatisfying results.
>> So, I decided to write directly to the SD. Using a simple application
>> (see code below), I found that the max rate of SD writing is about 20kB/s.
>> Is that it? is this the maximum rate possible? I was hoping to get at least
>> 0.5 or 1 MB/s. Any suggestions?
>>
>> Happy new year to you all...
>>
>> Here is my test code...
>>
>> -----------------TestSDP.nc-------------------
>> #include "TestSD.h"
>>
>> module TestSDP{
>> uses{
>> interface Leds;
>> interface Boot;
>> interface SD;
>> interface StdControl as SDStdControl;
>> }
>> }
>>
>> implementation{
>>
>> uint8_t resetData[SECTOR_SIZE], dummyData[SECTOR_SIZE];
>> int8_t data=0xff;
>> uint32_t beginSector=1000000, numOfIt=20000, currSector;
>>
>> //Using numOfIt=20000, it took the application 17 min and 47 sec to
>> run,
>> //from which 8 min and 51 sec to write dummyData.
>> //The rest of the time the application Formated the sectors.
>> //This means writing at about 20kB/s
>>
>> event void Boot.booted(){
>> call Leds.led2Toggle();
>> call SDStdControl.start();
>> memset(resetData, 0, SECTOR_SIZE);
>> memset(dummyData, data, SECTOR_SIZE);
>> call Leds.led2Toggle();
>> }
>>
>> void FormatSectors()
>> {
>> uint32_t i=0;
>> currSector=beginSector;
>> for (i=0; i<numOfIt; i++, currSector++)
>> {
>> call SD.writeBlock(currSector, resetData);
>> }
>> }
>>
>> void WriteDummyData()
>> {
>> uint32_t i=0;
>> currSector=beginSector;
>> for (i=0; i<numOfIt; i++, currSector++)
>> {
>> call SD.writeBlock(currSector, dummyData);
>> }
>> }
>>
>> async event void SD.available(){
>> call Leds.led0Toggle();
>> FormatSectors();
>> call Leds.led0Toggle();
>> call Leds.led1Toggle();
>> WriteDummyData();
>> call Leds.led1Toggle();
>> call Leds.led2Toggle();
>> }
>>
>> async event void SD.unavailable(){
>> }
>> }
>>
>> -----------------TestSDC.nc-------------------
>>
>> configuration TestSDC{
>> }
>> implementation{
>> components MainC, LedsC, SDC, TestSDP as app;
>> app.Boot -> MainC.Boot;
>> app.Leds -> LedsC;
>> app.SD -> SDC;
>> app.SDStdControl -> SDC;
>> }
>>
>> -----------------TestSD.h-------------------
>> #ifndef TEST_SD_H
>> #define TEST_SD_H
>> #define SECTOR_SIZE 512
>> #endif /* TEST_SD_H */
>>
>>
>> Best
>> Avishay
>>
>> _______________________________________________
>> Tinyos-help mailing list
>> Tinyos-help@millennium.berkeley.edu
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>
>
>
> --
> Eric B. Decker
> Senior (over 50 :-) Researcher
>
>
--
Best
Avishay
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