Program in external SDRAM and caching

Started by odi in comp.arch.embedded10 years ago 8 replies

hi, I have a simple program for my AT91RM9200 to turn led on and off. When I run it from internal SRAM it works ok, but when I copy it into...

hi, I have a simple program for my AT91RM9200 to turn led on and off. When I run it from internal SRAM it works ok, but when I copy it into external SDRAM and execute from there it jumps to address 0x2000001c (FIQ vector or is it just a coincidence?) instead of 0x2000003c (start code is there). 64MB of SDRAM was tested and looks ok. However when I disable instruction cache, this program works ok ...


ARM controller with integrated DAC

Started by Michael Keith in comp.arch.embedded9 years ago 32 replies

Hi everybody, I am searching for a controller with a fast integrated DAC but haven't been able to find anything suitable. Google led me to TIs...

Hi everybody, I am searching for a controller with a fast integrated DAC but haven't been able to find anything suitable. Google led me to TIs AM3517 but this is absolute overkill. I need processing power but not much in terms of interfaces. Something as simple as an LPC 2103 from NXP (albeit faster) with a DAC would be perfect. An ARM controller would be preferred but if necessary we consi...


I2C port IO chips

Started by Ralph Malph in comp.arch.embedded16 years ago 17 replies

I looked around the web and could not find any sources of I2C port IO chips other than Philips. Seems to get most of their I2C parts, you have...

I looked around the web and could not find any sources of I2C port IO chips other than Philips. Seems to get most of their I2C parts, you have to buy a couple thousand minimum. I am looking for a way to add 8 or 16 IOs. Some chips are port expanders, some are LED drivers; either will work if they come in small packages. So who else makes I2C chips? A google search turned up lots of st...


Macraigor on xp: download problem

Started by jerome in comp.arch.embedded15 years ago 3 replies

Hi, I am using Macraigor tools to try a download into a microcontroller board. I mean I am trying to!!! I type this command under cygwin,...

Hi, I am using Macraigor tools to try a download into a microcontroller board. I mean I am trying to!!! I type this command under cygwin, on XP home: OcdLibRemote -c ARM7 -d WIGGLER and I get the following message: JTAG SDO


What am I doing wrong?

Started by Julian Morrison in comp.arch.embedded14 years ago 23 replies

--nextPart2912043.rat7JAi7FX Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8Bit I'm trying to code a very simple...

--nextPart2912043.rat7JAi7FX Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8Bit I'm trying to code a very simple LED flasher as a starter app, and I can't get the damn thing to work. (This is on PIC16F627 and simulated on MPLAB.) The timer1 rollover never fires. Code follows as attachment. Can someone tell me what I'm doing wrong? --nextPart2912043.rat7JAi7FX ...


at91sam7: garbage on DBGU output

Started by Roman Mashak in comp.arch.embedded11 years ago 2 replies

Hello, MCU - at91sam7s64 toolchain - Yagarto (based on gcc-4.2.1) I have two distinct applications residing in the internal flash. The...

Hello, MCU - at91sam7s64 toolchain - Yagarto (based on gcc-4.2.1) I have two distinct applications residing in the internal flash. The first one located at 0x100000, prints string and transfers control to the second application located at 0x104000, which lights the LED and prints a string. The 1st application is compiled with vectors placed in ROM, while in the 2nd application vect...


Freescale Semiconductor Bought Out by Blackstone for $17.6B

Started by Bill Giovino in comp.arch.embedded13 years ago 3 replies

Freescale Semiconductor has been bought out by a group of investors led by Blackstone: for U.S....

Freescale Semiconductor has been bought out by a group of investors led by Blackstone: for U.S. $17.6B http://microcontroller.com/news/freescale_buyout.asp I'm at the Embedded Systems Conference in Boston and I've had mixed reviews on my analysis. I'm just sayin' what I think... Regards, Bill Giovino Executive Editor http://Microcontroller.com


PI controller algorithm

Started by cerr in comp.arch.embedded8 years ago 12 replies
LED

Hi There, I need to resolve following problem: I have an led panel with an opto transistor on it that measures the light emitted/reflected...

Hi There, I need to resolve following problem: I have an led panel with an opto transistor on it that measures the light emitted/reflected from the target. I want to control the emitted light to be equal to a certain setpoint from what the opto transistor measures. Does that make sense? I'm using an 18F pic to control the whole circuit and I wanted to come up with a PI if not a PID contro...


CS8900 Link Light/LED

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

Hello, I've designed a little board with a Cirrus Logic CS8900A-CQ3 ethernet controller on it, in 16-bit mode. When I connect my board to a...

Hello, I've designed a little board with a Cirrus Logic CS8900A-CQ3 ethernet controller on it, in 16-bit mode. When I connect my board to a hub, I only get a link light on my board, but not on the hub. However, I am able to read 0x630E from the PacketPage 0x0C register as Cirrus says I should be able to do in the AN 205 application note. Furthermore, using an external loopback connection...


What is the field (separated by :) in the file path listing?

Started by Robert Willy in comp.arch.embedded4 years ago 10 replies

Hi, I posted this question on BeagleBone group, but there is no reply to my question. I hope that somebody here can help. I see the...

Hi, I posted this question on BeagleBone group, but there is no reply to my question. I hope that somebody here can help. I see the following message from a link: http://www.element14.com/community/community/designcenter/single-board-computers/next-gen_beagle bone//blog/2013/11/22/beaglebone-web-server--led-blinking root@bbb-deb:~-- $ ls -l /sys/class/leds/beaglebone:*:*/brightnes


Atmega168 and peripheral interrupts

Started by P.Marek in comp.arch.embedded14 years ago 2 replies

I have a problem with an atmega168. On my test board I have a jumper on PB1 and a LED on PD5, using internal 8MHz RC-clock. Given the...

I have a problem with an atmega168. On my test board I have a jumper on PB1 and a LED on PD5, using internal 8MHz RC-clock. Given the following program: #include #include #include INTERRUPT(SIG_PCINT0) { unsigned short i; char j; for(j=0; j


Constant Current Regulators ('diodes') are back

Started by -jg in comp.arch.embedded10 years ago 2 replies

On Semi have released some low cost, constant current regulators that target LED drive, but have many more...

On Semi have released some low cost, constant current regulators that target LED drive, but have many more applications http://www.onsemi.com/PowerSolutions/newsItem.do?article=2094 Starting at $0.0545/10K, these are not the usual 'niche price nonsense' seen on other current regulator 2 terminal devices 'diodes'. Right now in 20/25/30mA, hopefully they can do 5/10/15mA too, soon... ...


GPIO on ATmega168 on pins PB6 (TOSC1) and PB7 (TOSC2)

Started by P.Marek in comp.arch.embedded14 years ago 2 replies

Hello everybody! I have a problem with ATmega168 (will later be an mega88) and PB6/PB7. I'm trying to use these as output pins, ie. drive...

Hello everybody! I have a problem with ATmega168 (will later be an mega88) and PB6/PB7. I'm trying to use these as output pins, ie. drive low-current LEDs by connecting PB6/PB7 via resistor and LED to +5V. That worked very good when I used PD5; but I need the PWM now and wanted to use PB6/PB7. I'm using the internal RC oscillator; timer 2 is currently unused, and if I need it later ...


Best microcontroller with Linux development tools

Started by Bob11 in comp.arch.embedded11 years ago 15 replies

Does anyone have any experience, or know of any vendors, of small microcontroller development tools than run natively on Linux? I'm looking at...

Does anyone have any experience, or know of any vendors, of small microcontroller development tools than run natively on Linux? I'm looking at processors in the 8051/AVR/Z8 etc class. I'm not looking for embedded Linux--I'm looking for a C compiler/IDE package that allows me to develop for that processor on my Linux workstation. I need the processor in my design for simple switch-scanning LED-ligh...


CY7C63801 port accessing

Started by Nicholas Kinar in comp.arch.embedded13 years ago

To Whom It May Concern: I have been trying to work with the enCoRe II line of USB microcontrollers from Cypress Semiconductor. Samples have...

To Whom It May Concern: I have been trying to work with the enCoRe II line of USB microcontrollers from Cypress Semiconductor. Samples have also been ordered of the enCoRe III line, which extends the offering to high-speed USB communications. To test the enCoRe II line of microcontrollers, I have been trying to turn a port pin on so that I might be able to supply current to an LED. ...


SMT Microscopes (Mantis Origional/Compact)

Started by Anonymous in comp.arch.embedded12 years ago
LED

We have an origional Mantis microscope at work and it is just awesome. I do a fair bit of SMT work at home and was contemplating the purchase...

We have an origional Mantis microscope at work and it is just awesome. I do a fair bit of SMT work at home and was contemplating the purchase of a mantis compact (About 2/3 the price). Has anyone on this group used both models? I like the concept of the Fanless LED light, but I worry that the cheaper model will not be as good as the origional. Paul


trouble understanding RETI instruction

Started by jack_e in comp.arch.embedded9 years ago 19 replies

Hi I am having trouble understanding RETI instruction. Being a novice at MSP430 architecture, have begun exploring by writing simple snippets....

Hi I am having trouble understanding RETI instruction. Being a novice at MSP430 architecture, have begun exploring by writing simple snippets. I am trying to blink a LED using a timer. I want to control the dutycycle of the flashing. My query is that after exiting the ISR on RETI, which instruction does the control flow go to. Have tried debugging via different methods but its still unclear. ...


Using AVR-GCC toolchain on Mac OS X

Started by J.A. Legris in comp.arch.embedded9 years ago 12 replies

Has anyone here taken the leap to a Mac based AVR development system? I'm attempting to use AVRdude with an AVRISP mkII programmer and...

Has anyone here taken the leap to a Mac based AVR development system? I'm attempting to use AVRdude with an AVRISP mkII programmer and it's showing signs of life, but it doesn't seem to be happy when the ISP cable is not connected to a target system. Specifically, the red/green status LED on the AVRISP doesn't light up at all, when I was expecting it to at least indicate the connection is bad...


Newbie Tech: Hex to BCD conversion

Started by Jim Knight in comp.arch.embedded16 years ago 5 replies
LED

Having an old 8 bit ASM converted to newer (ST7) 8-bit ASM. ST does not have a BCD mode (which the older processor did), so I need to...

Having an old 8 bit ASM converted to newer (ST7) 8-bit ASM. ST does not have a BCD mode (which the older processor did), so I need to convert arithmetic (mostly adds with carry) from hex to BCD, and back. The BCD uses a 4 bit nibble that does not exceed 10 decimal. In this application, the BCD is primarily used for 7 segment LED displays (to keep from trying to have an A-F put out to the ...


Brightest Bang for the Buck White HI LED

Started by tporter in comp.arch.embedded8 years ago 1 reply
LED

Curently using the Luxeon Rebel ES - LXML-PWN2 http://www.luxeonstar.com/Neutral-White-Lambertian-Rebel-230-lm-p/lxml-pwn2.htm Making a...

Curently using the Luxeon Rebel ES - LXML-PWN2 http://www.luxeonstar.com/Neutral-White-Lambertian-Rebel-230-lm-p/lxml-pwn2.htm Making a bicycle light w/ a driver made up of discrete parts. Any opinions on what the brightest white LEDs are for the lowest price? Thanks Tom