Device and method for converting a diagnostic interface to spi standard

• US 20040139369A1
• Filed: 11/12/2003
• Published: 07/15/2004
• Est. Priority Date: 06/13/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kirschner, Manfred
• Granted Patent: US 7,188,010 B2
• Time in Patent Office: Days
• US Class Current: 714/25
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue
• CPC Class Codes: F02D 41/28 Interface circuits

Abstract

The device described is used to convert a diagnostic interface to standard SPI and includes:

an electronic unit (10), having a data input (14), a data output (17), a synchronization input (15), a clock input (16) and a register (13) and

a buffer unit (12), having a signal input (19), a signal output (20) and an activation input (21).

The data input (14) and the data output (17) of the electronic unit (10) are connected to each other by a first data line (18). The data output (17) for the electronic unit (10) is connected to the signal input (19) on the buffer unit (12) by a second data line (22).

Claims

1. A device for converting a diagnostic interface to standard SPI, comprising:

an electronic unit (10), having a data input (14), a data output (17), a synchronization input (15), a clock input (16) and a register (13), and

a buffer unit (12), having a signal input (19), a signal output (20) and an activation input (21),

the data input (14) and the data output (17) of the electronic unit (10) being interconnected via a first data line (18), and the data output (17) of the electronic unit (10) being connected to the signal input (19) of the buffer unit (12) via a second data line (22).

2. The device as recited in claim 1,

wherein the synchronization input (15) of the electronic unit (10) and the activation input (21) of the buffer unit (12) are interconnected via a third data line (23).

3. The device as recited in claim 1 or 2,

wherein a pullup resistor (11) is connected at the data output (17) of the electronic unit (10).

4. The device as recited in one of claims 1 through 3,

wherein it is cascadable using devices of the same type.

5. A method for converting a diagnostic interface to standard SPI using a device as recited in one of claims 1 through 4 and a microprocessor,

in which the microprocessor first sets the synchronization input (15) of the electronic unit (10) and the activation input (21) of the buffer unit (12), feeds a clock signal to the clock input (16) of the electronic unit (10) and subsequently reads out, via the signal output (20) of the buffer unit (12), a number of data bits which were stored in the register (13) of the electronic unit (10), a first data bit being supplied from the data output (17) to the data input (14) via the first data line (18) and thus being sent at the end, and the microprocessor analyzing the read-out data bits accordingly.

6. The method as recited in claim 5,

wherein the baud rate is switched over.

7. A computer program comprising program code means in order to execute all steps of claim 5 when the computer program is run on a computer or a corresponding central processing unit, a microprocessor in particular.

8. A computer program product comprising program code means that are stored on a computer-readable data medium in order to execute the method according to claim 5 when the computer program is run on a computer or a corresponding central processing unit, a microprocessor in particular.