Writing data to a sector of MMC card

Started by Pelo...@ Home in comp.arch.embedded13 years ago 4 replies

Hi, I'm collecting and saving small amount of data (about 64 bytes) once per 5 minutes on MMC sector. I put my data into increment pointer in...

Hi, I'm collecting and saving small amount of data (about 64 bytes) once per 5 minutes on MMC sector. I put my data into increment pointer in SRAM memory, but I can't wait to fill 512B buffer. I have to save my data (512B buffer) on each collected data due to power lost. If I fill 512B SRAM buffer - I use next MMC sector. I use SPI mode and sector data is set to 512 bytes. I need to inv...


CodeVision AVR

Started by TC in comp.arch.embedded15 years ago 1 reply

Is there a possibility to place constants within the flash to an explicite address (similar to the @ directive, which places variables to an...

Is there a possibility to place constants within the flash to an explicite address (similar to the @ directive, which places variables to an address in SRAM)?


8 Bit up With Lots Of RAM

Started by David Sidlauskas in comp.arch.embedded15 years ago 11 replies

Does anyone know of an 8 bit microprocessor with at least 32K of SRAM and 32K of Flash? Or any number of bits if it's cheap (

Does anyone know of an 8 bit microprocessor with at least 32K of SRAM and 32K of Flash? Or any number of bits if it's cheap (


Yo Ulf S: How about a lds and a sts inst on the AVR?

Started by BobG in comp.arch.embedded10 years ago 4 replies

A loadword and storeword instruction from sram, maybe 3 cycle and atomic operation, would really shrink a lot of AVR programs. Faster. Smaller...

A loadword and storeword instruction from sram, maybe 3 cycle and atomic operation, would really shrink a lot of AVR programs. Faster. Smaller Cheaper. Whats the chance of this happening? See thread on avrfreaks.


simple flash file system

Started by Mastupristi in comp.arch.embedded15 years ago 9 replies

where can I find some infos or internet resource about writing a simple flash filesyestem? We don't need something complex (like jffs), since we...

where can I find some infos or internet resource about writing a simple flash filesyestem? We don't need something complex (like jffs), since we have 1MB flash and few Kbytes sram. thanks -- Mastupristi?


LH7A400 Evaluation Board

Started by Heiner Karlin in comp.arch.embedded13 years ago 1 reply

Hello, Does anybody know an evaluation board for the LH7A400 Controller, except the Logic PD Zoom card engine kits? I am looking for a...

Hello, Does anybody know an evaluation board for the LH7A400 Controller, except the Logic PD Zoom card engine kits? I am looking for a board with SRAM instead of SDRam, to test to which level power consumption can be brought. Thanks for all hints. H. Karlin


external SRAM interface to upsd3354

Started by pinkesh in comp.arch.embedded10 years ago

Hello, I am using upsd3354D. I want to interface external RAM of 32K on address bus of upsd3354D. How can I connect ? Please help me. thank...

Hello, I am using upsd3354D. I want to interface external RAM of 32K on address bus of upsd3354D. How can I connect ? Please help me. thank you. --------------------------------------- This message was sent using the comp.arch.embedded web interface on http://www.EmbeddedRelated.com


MCUs other than ARMs

Started by rickman in comp.arch.embedded13 years ago 23 replies

I am very familiar with the various ARM MCU offerings. But I have a need for an MCU with 3 or more SPI ports which is not so easy to find in an...

I am very familiar with the various ARM MCU offerings. But I have a need for an MCU with 3 or more SPI ports which is not so easy to find in an ARM. There are a few, but they have higher power consumptions and that makes them poor choices for a battery powered app. I don't have hard requirements yet, but I think 128 kB of Flash will do the job along with 16 kB of SRAM. I may need an I2C ...


CPLD + SRAM == Cheap BiDir FIFO (albiet... slow)

Started by jyaron in comp.arch.embedded14 years ago 1 reply

Does anybody have a link to VHDL code to transform say... XC9572 & CY7C1399 into a 'slow' Dual 16Kx8 FIFO (for about $3.65 in Qty 100) IDT's...

Does anybody have a link to VHDL code to transform say... XC9572 & CY7C1399 into a 'slow' Dual 16Kx8 FIFO (for about $3.65 in Qty 100) IDT's stuff is too $$$$ and I don't really need the 'instantaneous' simultaneous access from "both sides"... handshaking with ready/done deal is good enough.


DMA On LPC2468

Started by SwapnaliKambli in comp.arch.embedded10 years ago 1 reply

Hi, I am trying to configure DMA controller on LPC2468 .I got the sample code on NXP website. It is transfering data from memory to memory...

Hi, I am trying to configure DMA controller on LPC2468 .I got the sample code on NXP website. It is transfering data from memory to memory .This memory is internal USB SRAM. But not work on simulator of keil software Evaluation Version 3.23. Any one can help me in this regards. Swapnali


Where do you order IC parts from?

Started by ghazanhaider in comp.arch.embedded13 years ago 4 replies

I have been trying to get a simple SRAM chip at 8mbit. It seems that there are 20 manufacturers who make them, and nowhere to buy or get a few...

I have been trying to get a simple SRAM chip at 8mbit. It seems that there are 20 manufacturers who make them, and nowhere to buy or get a few samples. Digikey is where I started, but everythings out of stock except cyprus parts. Those parts are a bit more complex and high powered than I wanted. The Toshiba parts look great but theyre out of stock. I've tried mouser, arrownac, and took o...


Q:Help with Microcontroller selction

Started by Andreas Schweiger in comp.arch.embedded12 years ago 18 replies

Hi All, i am looking for a new Micro for a private project: Needed Features: - Performance of a 12MHz 80C535 is enough - 2 serial...

Hi All, i am looking for a new Micro for a private project: Needed Features: - Performance of a 12MHz 80C535 is enough - 2 serial Ports - 128kB Flash - Battery bufferd SRAM on board (16k and more) - RTC - 4 8 or 16bit Timers - GPIO's for Key's (8), LCD (Standart 4 bit and control) and LED (8) - SD card interface Most cruical is that a free compiler is available since I dont want...


Newbie with questions on AT91RM9200

Started by jtyler in comp.arch.embedded14 years ago 4 replies

Hi All, I have a few questions on implementation: P.S. I have read the manual closely. 1. How does the real time clock keep time during power...

Hi All, I have a few questions on implementation: P.S. I have read the manual closely. 1. How does the real time clock keep time during power cycles ? 2.I want to run my code in flash, i think these days it is fast enough, know it is only 16 bit and must use thumb mode on compiler. What othe problems will i not like ? 3. My RAM memory will be SRAM which again is only 16 bit and must b ba...


MCF5270 versus MCF5208

Started by okalex in comp.arch.embedded13 years ago 1 reply

Hello all, I'm trying to choose a microprocessor for a new design and would like to get input from members of the community who have used...

Hello all, I'm trying to choose a microprocessor for a new design and would like to get input from members of the community who have used these processors. The requirements are an Ethernet MAC (PHY would be nice, but haven't found a chip which meets this plus the other requirements), I2C, external memory bus to access 4MB SRAM (or SDRAM) buffer, hobbyist-friendly packaging (not BGA, prefe...


Looking for memory manufacturers

Started by Bob in comp.arch.embedded14 years ago 1 reply

We're having trouble hunting down sources for the particular flash/sram parts we need. Rather than providing a full spec of the parts...

We're having trouble hunting down sources for the particular flash/sram parts we need. Rather than providing a full spec of the parts needed (and expect someone here to find a perfect match :p), I was wondering if anyone knows of any other semiconductor companies not on my list that are manufacturers of memory [of any sort] and I'll go check them out. AKM, Alliance, Atmel (Temic), Aved, B...


QVGA display panel

Started by suresh shenoy in comp.arch.embedded12 years ago 4 replies

I am currently working with a QVGA and interfacing it with a display controller which has 256kbytes of SRAM (display buffer). The QVGA is 18...

I am currently working with a QVGA and interfacing it with a display controller which has 256kbytes of SRAM (display buffer). The QVGA is 18 bit (R,G,B - 6bit each.) I would like to calculate the address range for each line, so that I can fill the buffer appropriately. Any leads would be really helpful. Suresh M. Shenoy


FRAM FM3808 interfacing

Started by Glenn in comp.arch.embedded16 years ago 1 reply

I'm trying to design a circuit with Ramtron's non-volatile parallel FRAM with built-in RTC - the FM3808. The datasheet states that the FRAM...

I'm trying to design a circuit with Ramtron's non-volatile parallel FRAM with built-in RTC - the FM3808. The datasheet states that the FRAM works differently than SRAM, in that it needs the chip enable CE/ to toggle between each access and not stay low. This is because it is needed for the necessary precharge period. I'm using an Atmel ATmega128's external memory bus, and will be ...


Recommended Ethernet MAC/PHY?

Started by Randall Nortman in comp.arch.embedded14 years ago 14 replies

Thanks to all who responded to the previous thread I started regarding AVR+Nut/OS vs. ARM+Linux. I have decided to go with an AVR...

Thanks to all who responded to the previous thread I started regarding AVR+Nut/OS vs. ARM+Linux. I have decided to go with an AVR (Mega128) with external SRAM (32kB or 64kB, probably) and an external ethernet MAC. (I would still consider the AT91SAM7X, except that it doesn't seem to be generally available yet. If anybody knows where I can get it, I'll give it a shot.) For the OS and, more...


ARM LPC22xx development tools

Started by okalex in comp.arch.embedded13 years ago 16 replies

Hi folks, Instead of using a Coldfire core (as I wrote in a previous post), I've decided to use the NXP (Philips) LPC2210, as it's cheap and...

Hi folks, Instead of using a Coldfire core (as I wrote in a previous post), I've decided to use the NXP (Philips) LPC2210, as it's cheap and has a large enough memory bus to handle the 4MB SRAM we're going to use. I now need to decide upon a development kit and software tools. The dev. board has to have Ethernet capabilities, preferably using an RTL8019AS, though a CS8900A would be okay,...


How to add some SDRAM to a FPGA board ?

Started by whygee in comp.arch.embedded11 years ago 25 replies

Hello, I thought that I could ask for advices on this group since most high-end embedded CPU have the same constraints. I would like to add...

Hello, I thought that I could ask for advices on this group since most high-end embedded CPU have the same constraints. I would like to add a good RAM capacity to existing evaluation/development boards equiped with 2.54mm pins. Ideally that would mean 32 or 64MB with a 16-bit datapath (32-bit would be too wide, too many wires...). SRAM are not possible, the largest I have are 36Mbits in...