Could not receive data from GPIB system controller (PCI card of NI - 488-2)

Hello

We create a daughter card that will allow our product shipped to communicate via GPIB. This girl GPIB card must be able to receive the SCPI message send by system GPIB controller and reply to the message. In my current configuration, system controller is a card PCI of NOR-488. 2 installed on a PC running Windows XP.

On the side of card GPIB girl, we have NAT7210 with 75160 and 75161 transceiver chips. NAT7210 is connected to the interface of static memory controller (SMC) an Atmel ARM9 embedded Linux OS running. We use the Linux GPIB library on sourceforge - http://linux-gpib.sourceforge.net/ .

For now, chip NAT7210 initialization stage seems to be successful. Using Measurement & Automation Explorer software that comes with the NI GPIB PCI card, it is able to detect the daughter GPIB card; the cushion and the sad values are correct. However, chip NAT7210 has failed to receive the * IDN system controller message.

Here's what I did to initialize the NAT7210:

(1) set 0 x 99 in SPMR register. To make sure that we are 7210.

(2) in AUXMR the value 0 x 02 (chip reset at the controls). To affirm the message local pon.

(3) skip the step that defines the ICR and registered ICR2 because we use the default clock 8 Mhz.

(4) the value 0 x 31 (addressing Dual mode) in the register of the ADMR.

(4) together in ADR 0x01 to register.

(5) contained SPMR 0x40. Initial response of series. I don't know what are reasonable values to settle here.

(6) together to register 0x07 in hidden PPR. Do not participate in the parallel polls.

(7) set TASKS and NTNL bits in the AUXRG register.

(8) the value 0 x 51 (hldi to the order) in the AUXMR register.

(9) to activate the interruptions; IMR0 = 0xC5, IMR1 = 0xBF and IMR2 = 0x4F (no plans for DMA transfers).

(10) the value 0 (command pon) in the AUXMR register. Final step.

The NAT7210 Linux configuration file content:

minor = 0

board_type = "gpib".

name = "gpib0.

PAD = 1

sad = 96

Timeout = T3s

EOS = 0x0a

together-reos = yes

all-bin = no

together-xeos = no

together-eot = yes

base = 0 x 70000000

IRQ = 45

DMA = 0

master = no

Any ideas on what could be the reasons NAT7210 has failed to receive the * IDN system controller message?

Steve, thanks for your comments.

It turns out that the deactivation of functions that print messages in the debug library has solved the problem of reception.

Tags: NI Hardware

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