Re: external reset of timer
2005-01-19 by lpc2100_fan
Friendly amendment, during the capture interrupt service routine disable all other higher priority interrupts while handling the setting of the timer. Read
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Re: LPC2212
2005-01-19 by lpc2100_fan
Hi, after reset no matter whether programmed or not, in general ports are input, I2C ports are open drain. After programming, ports that you define as outputs
Re: [lpc2000] Re: 44Khz 16-bit audio
2005-01-19 by Bruce Paterson
... No, I believe the idea transformed to the extreme with MASH 1 bit converters. Sample fast enough and you only need 1 bit (a single high speed comparator).
Re: EXTMODE/EXTPOLAR & VPBDIV
2005-01-19 by philips_apps
Hi Bruce, There is no shorter way that this could be done. Also, please note, while reading the VPBDIV, it should be read twice. So you would want to do the
Re: [lpc2000] EINT1 and EINT2 problem
2005-01-19 by Bruce Paterson
... Thinking laterally, Have you tried using just one pin, but in the ISR flip the edge polarity bit every time (so you interrupt on both edges) ? If there is
LPC2212
2005-01-19 by scottkelsall
Hi Does anyone know what the default port logic levels are for the LPC2212 when the device is blank and energised ready for programming Also what are the
Re: 44Khz 16-bit audio
2005-01-19 by Owen Mooney
I have dropped into this discussion 1/2 through but felt like contributing Don t forget that the 6dB/bit applies to the A/D or D/A REGARDLESS of sample rate.
Re: EINT1 and EINT2 problem
2005-01-19 by Amit
Simon, Some questions: When you press stop on the debugger where is the PC pointing to ? (After the stall takes place) Is it held up in an exception vector ?
Re: external reset of timer
2005-01-19 by Karl Olsen
... has ... Use a capture pin and enable the capture interrupt. In the capture interrupt handler, remember the captured value as the time where you would have
Re: external reset of timer
2005-01-19 by Karl Olsen
... has ... Use a capture pin and enable the capture interrupt. In the capture interrupt handler, remember the captured value as the time where you would have
Re: 44Khz 16-bit audio
2005-01-19 by dlmassey2000
I ve got a preliminary data sheet from Philips for the LPC213X that states the ADC is capable conversions at 400 Ksamples/sec, 10 bit result. The data sheet
Re: 44Khz 16-bit audio
2005-01-19 by Rick Collins
... Don t assume 60 dB. That number will have to come from the data sheet as well. A theoretical maximum for a DAC is 6 dB per bit, but that level is never
Re: 44Khz 16-bit audio
2005-01-19 by Gus
60db is okay. now, how fast can I update the analog output on LPC chip? I looked on philips website and there is only data sheet with minimum information!!
Re: 44Khz 16-bit audio
2005-01-19 by Rick Collins
... Good vs. bad depends on your application. 60 dB is just a way of describing how much noise the DAC will add to the signal. 20 dB is a factor of 10x in
Re: 44Khz 16-bit audio
2005-01-19 by Gus
... that s built it. What audio frequency can you do with the internal DAC? Can someone explain more what is xxdb s/n? I am assuming s/n means signal/noise! So
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by tsvetanusunov
... this is very unlikely as we have many hundreds of LPC-P2114 and LPC- E2114 in production and never ever experienced latchup behaviour like on the REV.B
EINT1 and EINT2 problem
2005-01-19 by itsjustimpossible
Hi Has anyone had a problem when using both EINT1 and EINT2 on the LPC2294. I have them assigned to VIC0 and VIC1. (I also have a much faster seperate FIQ
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by moostieuk
Lots of decoupling on all the rails. I can t remember what the reset time is, but it s much longer (like 10 times or something - can t tell you as I m not at
Re: [lpc2000] Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by Robert Adsett
... Also what s your decoupling like? Marginal decoupling could give symptoms like this. Robert Freedom has no meaning of itself. There are always
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by Richard
Check your power up reset signal length, it should be at least 10ms (AFTER V18 is stable, check this). If it is shorter than this the processor may enter an
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by moostieuk
It s definately latched up in one way, cycling the reset line doesn t bring the chip out of the mode (which you would expect it to do). Only thing to do is
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by Richard
If you find yourself in an exception handler, probably looping indefinetly because it is not really a handler , then you are not latched up, yoou are
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by lp2000c
When you jump to the reset handler with the debugger, what is MEMMAP set to? I assume you want it set to FLASH Mode. ... jump ... rapidly. ... site: The
Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by moostieuk
We appear to have this problem on the LPC2114. Our prototype board appears to latch into a state sometimes on powerup. If you take the reset line down and
Re: [lpc2000] header files
2005-01-19 by Thomas Patrick
Hello Raj, which compiler are you using ?? gsudershanraj wrote: Guys, Can anyone send me the header files for LPC2138. Thanks in advance, Raj
external reset of timer
2005-01-19 by itsjustimpossible
Hi I need to use an external pulse to reset one of the timers of an LPC2294. The latency of the FIQ from an external interrupt is too long, so I wondered if
Resolving missed capture interrupts on T0/T1
2005-01-19 by Kerem Or
Hi All, For those who need to implement multiple capture functionality on the same timer, can use the sample interrupt service function that I uploaded to the
Re: [lpc2000] Re: LPC22XX usage
2005-01-19 by Kerem Or
I m using 16 bit wide Toshiba s SRAM (currently 1Mx16 - pcb supports upto 16MB) and Toshiba s Flash (1Mx16 - pcb supports upto 16MB). They have different
Re: 44Khz 16-bit audio
2005-01-19 by Rick Collins
... Codec is short for coder/decoder which means ADC and DAC. These days you can get a sigma-delta stereo Codec for under $5. So unless you are really trying
Re: [lpc2000] LPC22XX usage
2005-01-19 by Kerem Or
No. I am using LPC2214. What is it you would like to know ? Kerem ... From: RW Concepts - enquiries To:
Re: LPC22XX usage
2005-01-19 by acetoel
Hello... which SRAM and Flash Chips are you using? I m searching for something in a easy to solder package... Thanks Ezequiel ... using ... memory ... which
Re: [lpc2000] EXTMODE/EXTPOLAR & VPBDIV
2005-01-19 by Bruce Paterson
Question below: ... If I want to program both EXTMODE and EXTPOLAR, do I have to do this in two passes: old=VPBDIV, VPBDIV=0, EXTMODE=n, VPBDIV=n, VPBDIV=0,
Description : Software SPI Mode 3 driver, includes Atmel Dataflash Driver
2005-01-19 by Owen Mooney
Bugger ! I ve just written one of these !!!! :-) Owen
Re: Deeper Details on ADC LPC2114 2124 LPC2138
2005-01-19 by lp2000c
Does this also apply to pins which can be used for A/D, even if they are used for a different function? The 213x User Manual says that analog inputs are
EXTMODE/EXTPOLAR & VPBDIV
2005-01-19 by philips_apps
Hi Kerem, This is actually a bug which is related to the EXTINT.1 bug (present in the Errata sheet). Problem: Incorrect setting of EXTMODE and/or EXTPOLAR
Re: Deeper Details on ADC LPC2114 2124 LPC2138
2005-01-19 by lp2000c
Robert: Is that 20-40K biased toward a specific voltage? M ... servicing ... of
Compressed Audio on LPC21xx
2005-01-18 by jdw07675
Has anybody here worked with MP3 or other audio decoders on the LPC21xx? - jeff
Re: 44Khz 16-bit audio
2005-01-18 by jdw07675
I suppose I d first ask how good does the audio actually have to be? Full CD quality 44khz 16bit is extreme overkill if it s just going to drive a small
RE: [lpc2000] LPC22XX usage
2005-01-18 by Mark Crow
I (we) have been developing on a 2214 for many months now...and are using external SRAM, FLASH and a CPLD on the address/data bus. Works well... ... From: RW
Re: [lpc2000] Re: LPC22XX usage
2005-01-18 by Bill Knight
We have an LPC2214/2292 board at http://www.theARMPatch.com which has 12ns static RAM, a CS8900, and a CompactFlash interface on its external data bus. The
Re: [lpc2000] RTOS for LPC family
2005-01-18 by Michael Anburaj
Didier, You could try uC/OS-II! The ARM port for the same is free (which includes LPC210x HAL) & can be downloaded from my site. Currently it supports gcc &
44Khz 16-bit audio
2005-01-18 by Gus
Hello, For the analog and audio smarts out there I have some questions. I need to generate a good quality audio using LPC chips. The audio will be a 44.1Khz
Re: LPC22XX usage
2005-01-18 by Gus
I have ben using LPC21 for a while and now thinking about using LPC22 for a new project. Same as you, I would like to know if people haveing issues with it. -
LPC22XX usage
2005-01-18 by RW Concepts - enquiries
I ve been looking at using an LPC22XX device as I want an external memory bus. The thing is I ve never seen any postings about this range which leads me to
Re: Deeper Details on ADC LPC2114 2124 LPC2138
2005-01-18 by philips_apps
Hi Joe, ADC input impedance between 20kOhm and 40 kOhm Input capacitance 1 pF There is no Fifo. Using one of the continuous modes requires servicing through
RTOS for LPC family
2005-01-18 by didier_edna
Hello, I m quite new to actually using any RTOS and the ARM familly, but the LPC2k series look wonderfull, concerning speed and capabillities. I was wondering,
SPI delay
2005-01-18 by teunvandeberg
Hello all, I have written a SPI driver for use with FreeRTOS (www.freertos.org). I am using a LPC2292. Using this driver I have observed some strange behavior.
newbie starting project
2005-01-18 by ivo_deschepper
Hi all, I m programming for over ten years in assembler on the 8051, 68hc11 and atmels avr series. Now I should start a project with the LPC2138, I would like
Deeper Detials on ADC LPC2114 2124 LPC2138
2005-01-18 by phlpcmicro
Hi All, I am looking for block diagrams and operation and suggested usage detials on the LPC ADCs? Both the UM and DS are a little light on for detials. What
New file uploaded to lpc2000
2005-01-18 by lpc2000@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the lpc2000 group. File :