METHOD FOR PREVENTING PROCESS COLLISION OF MICRO CONTROLLER

• US 20070288928A1
• Filed: 08/03/2006
• Published: 12/13/2007
• Est. Priority Date: 06/08/2006
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Wistron Corporation
• Inventors: Chen, Nung-Kai
• Granted Patent: US 7,954,103 B2
• Time in Patent Office: Days
• US Class Current: 718/102
• CPC Class Codes: G06F 9/4843 by program, e.g. task dispatcher, supervisor, operating system
• CPC Class Codes: G06F 9/4887 involving deadlines, e.g. rate based, periodic

Abstract

A method for preventing process collision of a micro controller is disclosed. The method includes the following steps. At least a first process and a second process are provided, wherein the first process is executed by the micro controller in every first period, the second process is executed by the micro controller in every second period, and the first period is shorter than the second period. When collision of the first process and the second process may happen in the second period, the executing time of the second process is shifted a predetermined time.

Claims

1. A method for preventing process collision of a micro controller, comprising:

providing at least a first process and a second process, wherein the first process is executed by the micro controller in every first period, the second process is executed by the micro controller in every second period, and the first period is shorter than the second period; and

when collision of the first process and the second process could happen in the second period, the executing time of the second process is shifted a predetermined time.

2. The process collision preventing method as claimed in claim 1, wherein the micro controller is used for processing N processes respectively corresponding to N execution periods, the N execution periods have a greatest common divisor, and the K^th execution period is shorter than the (K+1)^th execution period, N and K are natural numbers, 0<

K<

=N.

3. The process collision preventing method as claimed in claim 2, wherein when process collision may happen at the least common multiple time of the N execution periods, the execution of the I^th process is delayed I times of the predetermined time, I is a natural number and 0<

I<

=N.

4. The process collision preventing method as claimed in claim 3, wherein when the J times of the predetermined time delayed to the J^th execution period is equal to the greatest common divisor, the processes after the J^th process are further delayed a predetermined time, J is a natural number and 0<

J<

=N.

5. The process collision preventing method as claimed in claim 4, wherein the predetermined time is a unit time.

6. The process collision preventing method as claimed in claim 5, wherein the unit time is 1 ms.