ARM Development Kit Suggestions

Started by Dave Boland in comp.arch.embedded9 years ago 6 replies

I'm near the end of a project and would like to learn more about ARM processors for embedded use. I have experience with 8052, 386, HC11, and...

I'm near the end of a project and would like to learn more about ARM processors for embedded use. I have experience with 8052, 386, HC11, and 6800 derivatives, but nothing with the ARM. Since this is a learning exercise (for now), the requirements are minimal: * Documentation: complete and reasonable well done. * Form factor: don't much care, but easy interface with peripherials nice. ...


Generate DTMF

Started by cell in comp.arch.embedded11 years ago 3 replies

I used a 8052 MCU (24MHz crystal) and a 8 bits R-2R DAC to generate DTMF tones.The sampling frequency is 5kHz. The output is then input to a 2nd...

I used a 8052 MCU (24MHz crystal) and a 8 bits R-2R DAC to generate DTMF tones.The sampling frequency is 5kHz. The output is then input to a 2nd order LP filter. The telephone line seems to not recognize my tone. Is the order of filter enough or not? Thanks!


SPI controlled registers in peripheral chips question.

Started by Martin Griffith in comp.arch.embedded11 years ago 2 replies

Just been handed a possible job that requires a encoder IC to be set up via SPI, about 20 r/w 8 bit registers. I'm going to use a 8052 with a ...

Just been handed a possible job that requires a encoder IC to be set up via SPI, about 20 r/w 8 bit registers. I'm going to use a 8052 with a 2 line LCD that's memory mapped, just because I have a couple of boards lying around I'll add a few buttons, but I was wondering if there is any neat way of organising the code (in C ) to play around with the registers while prototyping ( mucking...


CAN J1939 Help

Started by Neil in comp.arch.embedded13 years ago 15 replies

Hi I will be doing a J1939 project soon. I need to : 1.pick a micro. 2.write or buy the stack. 3.figure out which doc I need to Buy from...

Hi I will be doing a J1939 project soon. I need to : 1.pick a micro. 2.write or buy the stack. 3.figure out which doc I need to Buy from SAE. 4.Maybe get a Book? On the micro I found PICs 8052s AVRs Ulf tell me why I should go with Atmel (really!!) Does Atmel have any appnotes or contracts in the U.S. I have 8052 experience no AVR. I have search the web. too much general ...


Extra addr. lines needed

Started by John Tan in comp.arch.embedded15 years ago 6 replies

Hi, I'm using an 8052 that has 12 addr lines ~ 4KB of addressable space. But i need to access additional 512KB of ROM ~ 19 address...

Hi, I'm using an 8052 that has 12 addr lines ~ 4KB of addressable space. But i need to access additional 512KB of ROM ~ 19 address lines required! How do i extend the addr. to 19 lines. Can i do this: 1) get firmware engineer to extend it using GPIO pins ? Is this a good method ? 2) some kind of paging access ? how exactly, i not too sure in terms of HW wiring ? Thanks.


signature failure with AT89S52 on micromaster

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

Hi I've been trying to program an AT89S52 PLC44 flash chip (8052) using an IceTech Micromaster LV48 programmer and it won't accept the...

Hi I've been trying to program an AT89S52 PLC44 flash chip (8052) using an IceTech Micromaster LV48 programmer and it won't accept the signature of the device. It gives an error message suggesting several possibilities - including "Secure". I can read an OTP device ok and its signature is ok. We use a PLCC to DIP adapter from micromaster - AD-44PL-44DIP. Anyone had problems wit...


8051-variant dev board recommendations

Started by Philipp Klaus Krause in comp.arch.embedded3 years ago 4 replies

I'm looking for dev / eval boards for 8051-variants. Can anyone recommend good/cheap boards that fit the following criteria: * Enough XRAM. I'd...

I'm looking for dev / eval boards for 8051-variants. Can anyone recommend good/cheap boards that fit the following criteria: * Enough XRAM. I'd need at least 2KB, but 5KB would be better. * There should be free tools to get the program onto the MCU. Ideally, I'd like to have boards for these 8051-variants: * Intel 8052-like * AMD 80C521-style dual dptr (DPL1 at 0x84, DPH1 at 0x85, DPS at 0...


zero out bitvars area in cstartup

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

Hi there, I'm trying to zero out the bitvars area in a 8052 cpu in the 'cstartup' file. My compiler (IAR) has two "assembler operators"...

Hi there, I'm trying to zero out the bitvars area in a 8052 cpu in the 'cstartup' file. My compiler (IAR) has two "assembler operators" SFB(..) and SFE(..) that gives me the start and end of the "bit addresses" that needs to be cleared. MOV R0,#SFB(BITVARS) SJMP CLEAR_BITVAR_2 CLEAR_BITVAR: CLR R0 INC R0 CLEAR_BITVAR_2: CJNE R0,#SFE(BITVARS),CLEAR_BITVAR Th...