PDC w/ USART

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

Hello All, I am implementing hardware handshaking with USART on AT91RM9200 board (24.6.3.12 in data sheet). I need to make RTS signal...

Hello All, I am implementing hardware handshaking with USART on AT91RM9200 board (24.6.3.12 in data sheet). I need to make RTS signal orignating from CP drop to allow the remote device with which the CPU is communicating t transmit information to the CPU. The data sheet states that the USAR needs requires the use of the PDC (peripheral DMA controller) fo reception when using hardware han...


Recommendations for ARM compilers

Started by Jack Klein in comp.arch.embedded14 years ago 39 replies

We've just released a product with an ARM920T (Atmel's AT91RM9200). We are not happy with the tools and tool vendor we used. The vendor is an...

We've just released a product with an ARM920T (Atmel's AT91RM9200). We are not happy with the tools and tool vendor we used. The vendor is an ARM reseller, and the package we have includes the ADS 1.1 compiler/linker and the vendor's own debugger. We have found that ADS 1.1 is buggy, and the vendor's debugger is really poor. ADS 1.2 did not fix these bugs. Now that we've released the f...


why is a bootloader required?

Started by funkymunky in comp.arch.embedded14 years ago 13 replies

Hi, Im new to the arm family and embedded systems in general,till now iv worked a bit on the 89c51. Ive been puzzled by the following: why...

Hi, Im new to the arm family and embedded systems in general,till now iv worked a bit on the 89c51. Ive been puzzled by the following: why is a bootloader required in controllers like the at91rm9200 im using right now? how come no bootloader is required in a controller like the 89c51? Iv read a bit on the need for a bootloader in a PC..but why would it be required on a controller? Al...


Binaries compiled with ADS 1,2 not working..but the GNU versions are working fine!!

Started by Mayank Kaushik in comp.arch.embedded14 years ago 3 replies

Hi, Im working on the AT91rm9200. I had compiled a few programs using the ADS 1.2 package. But ive found that all of a sudden, these binaries...

Hi, Im working on the AT91rm9200. I had compiled a few programs using the ADS 1.2 package. But ive found that all of a sudden, these binaries are not executing on the microcontroller anymore! as soon as i load the program onto the controller using HyperTerminal, the controller resets..ive verified that this is a logical problem, all the hardware has been tested using scopes etc for electri...


atmel at91rm9200: serial comms and loading u-boot

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

Hi, I'm having issues getting serial comms working with my board; I have traced clean data pulses from the PC serial port to the Atmel CPU,...

Hi, I'm having issues getting serial comms working with my board; I have traced clean data pulses from the PC serial port to the Atmel CPU, and put the CPU into debug mode after a power down cycle plus jumper setting. So I know the wires are connected :-) Need to load u-boot onto the board and so on ... any insights that could be shared? Thanks, Manu


alternative to DM9161E ( Ethernet physical layer transceiver)??

Started by Mayank Kaushik in comp.arch.embedded14 years ago 3 replies

hi all, Im using an AT91RM9200 chip nowadays and im starting to look at building an ethernet interface . the chip needs to be used with...

hi all, Im using an AT91RM9200 chip nowadays and im starting to look at building an ethernet interface . the chip needs to be used with a physical layer transceiver . The AT91DK uses DM9161E , i cant seem to get hold of that chip . is there any cheap , easily avaliable and easy to use alternative .....by the way im in Delhi , India. THanks Mayank


HOT SWAP COMPACT FLASH

Started by jtyler in comp.arch.embedded14 years ago 2 replies

I am confused, the AT91RM9200 comes with a compact flash interface. I would like to be able to hot swap the cf while the system is running. How...

I am confused, the AT91RM9200 comes with a compact flash interface. I would like to be able to hot swap the cf while the system is running. How do I make the interface hot-swappable. Do I need PCMCIA interface. Or is there another way to hot swap. I really thank you for any reply john This message was sent using the comp.arch.embedded web interface o www.EmbeddedRelated.com


Help needed in ATMEL ARM9 microcontroller

Started by bbaskaran in comp.arch.embedded13 years ago 2 replies

Dear All, I am using ARM9 based ATMEL AT91RM9200 microcontoller for a communication project. I am using a custom designed PCB. Problem is...

Dear All, I am using ARM9 based ATMEL AT91RM9200 microcontoller for a communication project. I am using a custom designed PCB. Problem is when i am receiving data via serial port, some times the controller got hang up. Need to restart every time. I am using RS485 communication and receive data via ttyS3 port. Presently i am receiving data in non-cannonical mode. controller have ...


Multiplexed signals on PIO controllers-AT91RM9200

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

Hello! Can we use the multplexed signals on PIO controllers simultaneously to different peripherals? For example, the I/O line PB19(PIO...

Hello! Can we use the multplexed signals on PIO controllers simultaneously to different peripherals? For example, the I/O line PB19(PIO controller B)is multplexed with DTR1(on peripheral A )and ERXCK (on peripheral B). I want to use DTR1 for an RS-232 transciver and ERXCK for Ethernet Transciever, simultaneously.How can I achieve this? Please suggest. Best regards, S Mahesh.


BGA soldering and ground plane

Started by sjon...@scannex.co.uk in comp.arch.embedded11 years ago 19 replies

I have designed a 6 layer board using a 256 ball Atmel BGA chip (AT91RM9200). It consists of two internal power layers, 2 internal signal layers...

I have designed a 6 layer board using a 256 ball Atmel BGA chip (AT91RM9200). It consists of two internal power layers, 2 internal signal layers and two heavily copper filled outer layers with virtually no tracks. The stackup has the Toplayer, Signal layer then Power layers very close together with a 1mm core. I am seeing a high level of failures due to the BGA chip solder balls not melting ...


BGA reflow soldering profile

Started by sjon...@scannex.co.uk in comp.arch.embedded11 years ago 1 reply

I am having problems soldering a Rohs compliant BGA ATMEL AT91RM9200 (rohs compliant board) This device recommends a soldering profile...

I am having problems soldering a Rohs compliant BGA ATMEL AT91RM9200 (rohs compliant board) This device recommends a soldering profile from J-STD-20 and a minimum peak package temperature of 250 centigrade, peak 260. However a lot of the other components on the board have lower peak reflow temps, such as sanyo poscaps (240), watch crystals and littlefuse fuses (245). These components are very...


SPI DataFlash vs parallel Flash for running Linux on an ARM board

Started by Mayank Kaushik in comp.arch.embedded14 years ago 1 reply

Hi, Ive been developing a board based on the AT91rm9200 (arm920t). I have added 16 MB ram to this board, and am looking to add some...

Hi, Ive been developing a board based on the AT91rm9200 (arm920t). I have added 16 MB ram to this board, and am looking to add some flash. I want Linux installed on this board. (this is basically an educational project) My question is, do i HAVE to add a parallel flash? will such a system be capable of running Linux if i just add an 8MB SPI dataflash? As far as i know, a parallel flas...