Embedded
in [Hardware]
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speed of writing file is fixed when changing the CLK of SD/MMC Hello All, I met a strange problem : the speed of writing file is fixed to a same value (about 50KB/s) whatever the SD/MMC CLK (from 600KHz to 12MHz), my platform is LPC2478, SD card is 2GB, filesystem is FatFs; I have tried 600KHz, 1MHz, 2MHz, 3MHz, 6MHz, 12MHz, but the Write speed seams fixed to 50KB/s, a... 9 Feb 2010 03:59
Good uController book (or web site)? On Fri, 05 Feb 2010 13:31:30 +0000, Tim Watts <tw(a)dionic.net> wrote: Hi, I can hack my way around AVRs OK - but I realise my limitations... I normally program in perl on larger computers, so wasting cycles has never been something I've worried about(!). Nor do I normally do timing sensitive stuff wher... 7 Feb 2010 09:45
LPc2478 external Sdram initialization Help Needed Hi all, Am using lpc2478 for 6.5 TFT LCD development in that am using 256Mb(K4S561632E-FROM SAMSUNG) SDRAM for LCD FRAME BUFFER. can anyone help me to solve the sdram initialization problem, i have attached the sdram init coding can anyone suggest me to solve the sdram initalizing problem. void sdramInit(voi... 13 Feb 2010 04:56
how to enable prink message on EP9307(linux 2.6.8.1) Hi Guys, Can some one please show how to enable printk KERNEL_INFO messages to appear on serial terminal. I am trying to change the lcd device driver ep93xxfb.c So i have add some printk messages in the exsisting driver to see the current configuration of the lcd. The existing ep93xxfb.c has printk command but no... 5 Feb 2010 11:38
OVM7690-R20A how to wire it Hi, I have a OVM7690-R20A CameraCube image sensor from OmniVision, the device is very small I need to wire it with a protoboard. Does anyone know how this device can be wired ?? Thanks in advance --------------------------------------- Posted through http://www.EmbeddedRelated.com ... 5 Feb 2010 13:55
atmega48 adc at faster than best clock speeds comp.arch.embedded atmega48 adc at faster than best clock speeds Atmel's atmega48 manual states the adc clock should run between 100 kcs & 200 kcs for best, most accurate conversions. They also state that higher clock rates can be used, presumably when a higher sampling rate is to greater advantage than best... 5 Feb 2010 12:47
Suitable Integer Square Root Algorithm for 32-64-Bit Integers on Inexpensive Microcontroller? Hi, I have the need in a microcontroller application to calculate floor(sqrt(x)) where x is approximately in the range of 2^32 - 2^64. What are the algorithms I should look at? These small microcontrollers are characterized by having a 8-bit times 8-bit to give 16-bit result integer unsigned multiply instr... 17 Feb 2010 00:01
LPc2478 external Sdram initialization Help Needed Hi all, Am using lpc2478 for 6.5 TFT LCD development in that am using 256Mb(K4S561632E-FROM SAMSUNG) SDRAM for LCD FRAME BUFFER. can anyone help me to solve the sdram initialization problem, i have attached the sdram init coding can anyone suggest me to solve the sdram initalizing problem. void sdramInit(voi... 4 Feb 2010 09:57
How to check USB performance Hi, have configured my omap USB OTG controller as a peripheral with ECM and ACM configuration. How do I measure just the usb/ecm device performance in this configuration. Please let me few pointers or test tools which can do so. (for ex: IPERF - standard UDP / TCP - bandwidth check ) Regards, Sandeep ... 4 Feb 2010 00:06
USB transfer for DE2 board hi, I'm modifying the coding from DE2 board CD -> DE2_demonstrations -> DE2_NIOS_DEVICE_LED. For the firmware of device controller for ISP1362 chip, there got six related coding: MAINLOOP.C, CHAP_9.C, D13BUS.C, HAL4SYS.C, HAL4D13.C AND ISR.C. Where HAL4SYS.C and HAL4D13.C is hardware abstraction layer; ISR.C... 3 Feb 2010 19:39 |