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Hi: Since I do not have any special software ( I work from Linux and GCC and Olimex board ) from board manufacturers, I am unable to understand the mystery of boot process and how it changes the execution from Flash to SRAM with help of MEMMAP: 1. If initially MEMMAP bits are "00", and Vectors are mapped from boot block, how does (during booting) the boot software read the flash memory to undersatnd if there is a valid code there? Does the boot up software switch MEMMAP to "01" so that it could access the flash rom? 2. The Philips AN10254 note shows that we can execute the program from SRAM by giving MEMAP = 0x2; instruction in the main() routine. This code must have been executed from the flash only? If so, should the Flash rom and SRAM have the same image ? What is the state of the PC before, during and after the execution of MEMAP = 0x2; Seems like a "hyper jump" from flash space to SRAM space. What happens to the pipeline at this time? Appreciate any clarification from the group. Thanks - Mathew |
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Re: Help, clarify the boot sequence and MEMMAP
Started by ●July 2, 2004
Reply by ●July 2, 20042004-07-02
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Hi all. I have been monitoring this group for about half a year now waiting for the "right" time to start an LPC project, that time is now! I've made a simple datalogger with an SD card,GPS and GSM modem in a similar design I currently use with an atmel avr, I would appriciate if someone would take a breif look at my schematic and see if I have made any obvious mistakes with the LPC and its bootloader select pin etc. Diagram: http://www.electro-logic.com/diagram.pdf At the same time I would like to ask if anyone has worked with the Keil uVision compiler, as I will probertly be using this compiler or the ARM ADS depending on which is best and easiest to use, any comments ? Best regards and many thanks for having me in this great group ! Lasse Madsen |
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Reply by ●July 2, 20042004-07-02
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welcome to ARM world!! I have made the same project-> GPS -> however I would recommend you to use GPRS modem instead of GSM(of course if u do it for commercial manner). I use the KEIL IDE and in KEIL u can select the ADS compiler as an option. however I prefer the GNU compiler to ADS compiler. --- Lasse Madsen <> wrote: > Hi all. > > I have been monitoring this group for about half a > year now waiting for the > "right" time to start an LPC project, that time is > now! I've made a simple > datalogger with an SD card,GPS and GSM modem in a > similar design I currently > use with an atmel avr, I would appriciate if someone > would take a breif look > at my schematic and see if I have made any obvious > mistakes with the LPC and > its bootloader select pin etc. > > Diagram: > http://www.electro-logic.com/diagram.pdf > > At the same time I would like to ask if anyone has > worked with the Keil > uVision compiler, as I will probertly be using > this compiler or the ARM ADS depending on which is > best and easiest to use, > any comments ? > > Best regards and many thanks for having me in this > great group ! > > Lasse Madsen > > ------------------------ Yahoo! Groups Sponsor > --------------------~--> > Make a clean sweep of pop-up ads. Yahoo! Companion > Toolbar. > Now with Pop-Up Blocker. Get it for free! > http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/dN_tlB/TM > --------------------------------~-> > Yahoo! Groups Links > > ===== Taner Mutlu Elektronik M. GLOBAL Bilgisayar ve Kontrol Sistemleri __________________________________ |
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Reply by ●July 2, 20042004-07-02
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Hi Taner. Thanks for the advice, the modem is already GPRS enabled and i was hoping to find an RTOS with a PPP TCP/IP protocol stack ( I have written my own but its not at all what I would like it to be ! ) I was told that there where problems with SD CARD's using the hardware SPI port !?!?!?!? What is this all about and did someone find a solution ? Best regards Lasse Madsen -----Oprindelig meddelelse----- Fra: Taner Mutlu [mailto:] Sendt: 2. juli 2004 11:34 Til: Emne: Re: [lpc2000] My First LPC design... welcome to ARM world!! I have made the same project-> GPS -> however I would recommend you to use GPRS modem instead of GSM(of course if u do it for commercial manner). I use the KEIL IDE and in KEIL u can select the ADS compiler as an option. however I prefer the GNU compiler to ADS compiler. --- Lasse Madsen <> wrote: > Hi all. > > I have been monitoring this group for about half a > year now waiting for the > "right" time to start an LPC project, that time is > now! I've made a simple > datalogger with an SD card,GPS and GSM modem in a > similar design I currently > use with an atmel avr, I would appriciate if someone > would take a breif look > at my schematic and see if I have made any obvious > mistakes with the LPC and > its bootloader select pin etc. > > Diagram: > http://www.electro-logic.com/diagram.pdf > > At the same time I would like to ask if anyone has > worked with the Keil > uVision compiler, as I will probertly be using > this compiler or the ARM ADS depending on which is > best and easiest to use, > any comments ? > > Best regards and many thanks for having me in this > great group ! > > Lasse Madsen > > ------------------------ Yahoo! Groups Sponsor > > Yahoo! Groups Links > > ===== Taner Mutlu Elektronik M|h. GLOBAL Bilgisayar ve Kontrol Sistemleri __________________________________ Yahoo! Groups Links |
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Reply by ●July 2, 20042004-07-02
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in the following address I think u can find some tcp/ip stacks and links but I think u will need to port to ARM I havent tried them. http://www.unusualresearch.com/tinytcp/tinytcp.htm I havent used SD Flash Cards sorry I cant help u about that.(but I will have to anyway) --- Lasse Madsen <> wrote: > Hi Taner. > > Thanks for the advice, the modem is already GPRS > enabled and i was hoping to > find an RTOS with a PPP TCP/IP > protocol stack ( I have written my own but its not > at all what I would like > it to be ! ) > I was told that there where problems with SD CARD's > using the hardware SPI > port !?!?!?!? > What is this all about and did someone find a > solution ? > > Best regards > Lasse Madsen > > -----Oprindelig meddelelse----- > Fra: Taner Mutlu [mailto:] > Sendt: 2. juli 2004 11:34 > Til: > Emne: Re: [lpc2000] My First LPC design... > welcome to ARM world!! > I have made the same project-> GPS -> however I > would recommend you to use GPRS modem instead of > GSM(of course if u do it for commercial manner). > > I use the KEIL IDE and in KEIL u can select the ADS > compiler as an option. however I prefer the GNU > compiler to ADS compiler. > > --- Lasse Madsen <> wrote: > > Hi all. > > > > I have been monitoring this group for about half a > > year now waiting for the > > "right" time to start an LPC project, that time is > > now! I've made a simple > > datalogger with an SD card,GPS and GSM modem in a > > similar design I currently > > use with an atmel avr, I would appriciate if > someone > > would take a breif look > > at my schematic and see if I have made any obvious > > mistakes with the LPC and > > its bootloader select pin etc. > > > > Diagram: > > http://www.electro-logic.com/diagram.pdf > > > > At the same time I would like to ask if anyone has > > worked with the Keil > > uVision compiler, as I will probertly be using > > this compiler or the ARM ADS depending on which is > > best and easiest to use, > > any comments ? > > > > Best regards and many thanks for having me in this > > great group ! > > > > Lasse Madsen > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ===== > Taner Mutlu > Elektronik M|h. > GLOBAL Bilgisayar ve Kontrol Sistemleri > __________________________________ > > > Yahoo! Groups Links > ------------------------ Yahoo! Groups Sponsor > --------------------~--> > Yahoo! Domains - Claim yours for only $14.70 > http://us.click.yahoo.com/Z1wmxD/DREIAA/yQLSAA/dN_tlB/TM > --------------------------------~-> > Yahoo! Groups Links > > ===== Taner Mutlu Elektronik M. GLOBAL Bilgisayar ve Kontrol Sistemleri __________________________________ |
Reply by ●July 2, 20042004-07-02
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--- In , "Lasse Madsen" <lm@h...> wrote: > Hi all. > > I have been monitoring this group for about half a year now waiting for the > "right" time to start an LPC project, that time is now! I've made a simple > datalogger with an SD card,GPS and GSM modem in a similar design I currently > use with an atmel avr, I would appriciate if someone would take a breif look > at my schematic and see if I have made any obvious mistakes with the LPC and > its bootloader select pin etc. > > Diagram: > http://www.electro-logic.com/diagram.pdf > > At the same time I would like to ask if anyone has worked with the Keil > uVision compiler, as I will probertly be using > this compiler or the ARM ADS depending on which is best and easiest to use, > any comments ? > > Best regards and many thanks for having me in this great group ! > > Lasse Madsen Hi Lasse, take a closer look at the SPI Interface to the Memory Card. If the LPC is working as a SPI Master you must set a 1 to the SSEL input. Also the CS at the SD/MMC is an input (active low). Andreas |
Reply by ●July 2, 20042004-07-02
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At 09:21 AM 7/2/04 +0200, you wrote: >"right" time to start an LPC project, that time is now! I've made a simple >datalogger with an SD card,GPS and GSM modem in a similar design I currently >use with an atmel avr, I would appriciate if someone would take a breif look >at my schematic and see if I have made any obvious mistakes with the LPC and >its bootloader select pin etc. A couple of suggestions. - Add some sort of power monitor/power on reset chip. For an evaluation board not necessary. - Add on a standard ISP header http://www.open-research.org.uk/ARMuC/index.cgi?Standard_ISP_Header for serial port connection and programming. One question. Are you sure that there is no condition under which Data Carrier from U4 will not be high after a reset? IF it is ever low or floating after a reset you will run into problems. On a related note. I believe the LPC starts with its pins as inputs. That means that any you are using as outputs will float during the period from reset until initialization. I noticed couple of lines being used as outputs that appeared not to have the appropriate pull-up or pull-down resistors. Robert |
Reply by ●July 2, 20042004-07-02
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Greetings, CMX offers an RTOS and a TCP/IP stack with PPP, AT Modem commands, etc., for the LPC platform. The software supports the ARM, IAR, or KEIL compilers for these processors. The url is www.cmx.com Best Regards, JR Rodrigues CMX Systems, Inc. --- In , "Lasse Madsen" <lm@h...> wrote: > Hi Taner. > > Thanks for the advice, the modem is already GPRS enabled and i was hoping to > find an RTOS with a PPP TCP/IP > protocol stack ( I have written my own but its not at all what I would like > it to be ! ) > I was told that there where problems with SD CARD's using the hardware SPI > port !?!?!?!? > What is this all about and did someone find a solution ? > > Best regards > Lasse Madsen > > -----Oprindelig meddelelse----- > Fra: Taner Mutlu [mailto:tanermutlunun@y...] > Sendt: 2. juli 2004 11:34 > Til: > Emne: Re: [lpc2000] My First LPC design... > welcome to ARM world!! > I have made the same project-> GPS -> however I > would recommend you to use GPRS modem instead of > GSM(of course if u do it for commercial manner). > > I use the KEIL IDE and in KEIL u can select the ADS > compiler as an option. however I prefer the GNU > compiler to ADS compiler. > > --- Lasse Madsen <lm@h...> wrote: > > Hi all. > > > > I have been monitoring this group for about half a > > year now waiting for the > > "right" time to start an LPC project, that time is > > now! I've made a simple > > datalogger with an SD card,GPS and GSM modem in a > > similar design I currently > > use with an atmel avr, I would appriciate if someone > > would take a breif look > > at my schematic and see if I have made any obvious > > mistakes with the LPC and > > its bootloader select pin etc. > > > > Diagram: > > http://www.electro-logic.com/diagram.pdf > > > > At the same time I would like to ask if anyone has > > worked with the Keil > > uVision compiler, as I will probertly be using > > this compiler or the ARM ADS depending on which is > > best and easiest to use, > > any comments ? > > > > Best regards and many thanks for having me in this > > great group ! > > > > Lasse Madsen > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > ===== > Taner Mutlu > Elektronik M|h. > GLOBAL Bilgisayar ve Kontrol Sistemleri > taner@g... > > > __________________________________ > > > Yahoo! Groups Links |
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Reply by ●July 3, 20042004-07-03
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Hi Lasse, If you are interested in a Free, yet reliable RTOS check ucos-ii.com & my port for ARM7s/9s is free & is up in the following link, it also includes BSP for LPC (RTOS+BSP for LPC takes only 4KB of code space). http://geocities.com/michaelanburaj/uCOS/index.html You can run LwIP TCP/IP stack on top of uCOS-II & I have port for this also at the same link. As far as tool chains: ADS is by far the BEST (it has to be). GCC is quiet good... I have done lots of porting work ADS->GCC & worked on very complex huge images.. with all the experience I say this. I have not idea about KEIL or other ARM tools. Cheers & Good-luck, -Mike. --- jrcmx1234 <> wrote: > Greetings, > > CMX offers an RTOS and a TCP/IP stack with PPP, AT > Modem commands, > etc., for the LPC platform. The software supports > the ARM, IAR, or > KEIL compilers for these processors. The url is > www.cmx.com > > Best Regards, > > JR Rodrigues > CMX Systems, Inc. > > --- In , "Lasse Madsen" > <lm@h...> wrote: > > Hi Taner. > > > > Thanks for the advice, the modem is already GPRS > enabled and i was > hoping to > > find an RTOS with a PPP TCP/IP > > protocol stack ( I have written my own but its not > at all what I > would like > > it to be ! ) > > > > > > I was told that there where problems with SD > CARD's using the > hardware SPI > > port !?!?!?!? > > What is this all about and did someone find a > solution ? > > > > Best regards > > Lasse Madsen > > > > -----Oprindelig meddelelse----- > > Fra: Taner Mutlu [mailto:tanermutlunun@y...] > > Sendt: 2. juli 2004 11:34 > > Til: > > Emne: Re: [lpc2000] My First LPC design... > > > > > > welcome to ARM world!! > > I have made the same project-> GPS -> however I > > would recommend you to use GPRS modem instead of > > GSM(of course if u do it for commercial manner). > > > > I use the KEIL IDE and in KEIL u can select the > ADS > > compiler as an option. however I prefer the GNU > > compiler to ADS compiler. > > > > --- Lasse Madsen <lm@h...> wrote: > > > Hi all. > > > > > > I have been monitoring this group for about half > a > > > year now waiting for the > > > "right" time to start an LPC project, that time > is > > > now! I've made a simple > > > datalogger with an SD card,GPS and GSM modem in > a > > > similar design I currently > > > use with an atmel avr, I would appriciate if > someone > > > would take a breif look > > > at my schematic and see if I have made any > obvious > > > mistakes with the LPC and > > > its bootloader select pin etc. > > > > > > Diagram: > > > http://www.electro-logic.com/diagram.pdf > > > > > > At the same time I would like to ask if anyone > has > > > worked with the Keil > > > uVision compiler, as I will probertly be using > > > this compiler or the ARM ADS depending on which > is > > > best and easiest to use, > > > any comments ? > > > > > > Best regards and many thanks for having me in > this > > > great group ! > > > > > > Lasse Madsen > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > ===== > > Taner Mutlu > > Elektronik M|h. > > GLOBAL Bilgisayar ve Kontrol Sistemleri > > taner@g... > > > > > > > > > > __________________________________ > > > > > > > > > > Yahoo! Groups Links __________________________________ |
