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Hi,
I'm trying to make multi-master protocol over RS485 ...
I have enought exprience with USB, CAN and RS485 (master-slave), but now I have to make it multi-master...
I think there are 2 scenarios :
1) Good CRC for detecting collisions and discarding then by mandatory ACK scheme...
2) Time...
Hi,
I'm trying to port FreeRTOS on Atmel AT91SAM7X512 to work with KS8993 switch from Micrel using MII interface. The question is how to control switch cause there aren't specific Inputs MDIO and MDC for read/write PHY registers ? Has anyone solution to that problem ?
Thanks!
lpc2378 usb driver
Hi again,
Sorry for delay, hope it's not too late...
Now two use standard CDC PC device driver you must
config your descriptors in proper way... Also there are several standard
device request that USB performs when you attach your device (like...
usb missing audio packets
Hi again SIE - that is Serial Interface Engine ... This is the part of any USB device that handle encoding/decoding including CRC generation and checking... It's Build-in Hardware module within USB function for any microcontroller...
But one thing disturb me... If you...
Re: GSM modems
If you use Wavecom or Telit you don't need external memory... They have huge memory inside...
For other options you will need some external memory to store messages...
If you will use only sms - oany gsm module can suit your requirements...
SimCom is at lowest cost... From...
telit modem bugs
Hi,
There are many GSM/GPRS modems that use depending on your requirements...
You can control them from PIC or some other uC via AT commands via any UART port and/or directly via serial interface (Wavecom & Telit modules only)...
Now you must choose depending on following...
serial interface engine
So, host has enought bandwidth for both devices...
Can you detect (via breakpoint) is the reason is due to CRC errors ? I doubt cause it must be in SIE engine ... However... For Isochronous transfer it is normal to skip some packets due to crc errors... What is your...
usb bulk transfer lost
Hi!
You must provide some more details about that situation...
How exactly your device is missing ? Just missed some packet or is entirely lost from USB bus ?
Are you sure that the USB camera use Bulk ? It's not typical for real video & audio ...
Also if it is Bulk...
free rtos for lpc2378
Hi !
There are several questions you must answer before do anything with USB PC sw...
1) What is your OS for lpc2378 if any ? If you use FreeRTOS there is a nice port of it in yahoo LPC2000 group with source code, manuals etc... I have uploaded there such port with custom...
msp430 os blu
Hi!
Check this one:
https://www.freertos.org/
It's very nice RTOS for embedded apps and it has port for MSP430 and some demo
apps and it is FREE! You can download it from here:
https://sourceforge.net/project/showfiles.php?group_id=111543&package_id=120544
I use it and I...
Re: H.264
Hi!
I think DCT is the most complicated task! Honestly I have no experience with DCT (I have used only FFT without FPU). Try find some open source software model that can help your algorithm.
I also see that xilinx and altera have some DCT related papers and manuals and as I see...
What is max data bytes that can be exchanged b/w FPGA & DDR2 memory for spartan3 device ? I.e. max DATA throughtput Bytes/s that cna be stored into DDR2 memory ?
Does someone knows calculator tool for DDR2 memories i.e. clk vs data throughput ?
Tnx !
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