AN2667 Application note

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1 Application note STM8A GPIO application examples Introduction This document is intended to provide two practical application examples of the GPIO peripheral use in the STM8A device. The examples are: Toggling and reading I/Os in polling mode Toggling and reading I/Os in interrupt mode For further information on the STM8A family features, pinout, electrical characteristics, mechanical data and ordering information, please refer to the STM8AF61xx, STM8AF51xx datasheet. This application note, its associated firmware, and other such application notes are written to accompany the STM8 firmware library. Please contact STMicroelectronics for information on the STM8 firmware library. April 2008 Rev 1 1/6

2 Contents AN2667 Contents 1 Example 1: Toggling and reading I/Os in polling mode Overview Hardware description Firmware description Example 2: Toggling and reading I/Os in interrupt mode Overview Hardware description Firmware description Revision history /6

3 Example 1: Toggling and reading I/Os in polling mode 1 Example 1: Toggling and reading I/Os in polling mode 1.1 Overview This example describes how to use the GPIO library functions to toggle and read different I/Os of the STM8A device in polling mode. 1.2 Hardware description Figure 1 shows the main hardware connections needed to toggle and read different I/Os. Figure 1. Toggling and reading different I/Os of the STM8A device +5V V 4.7K LED1 KEY Key 100 Ω 100nF nf PCO PC0 PH3 PH2 LED2 LED1 LED3 LED2 PH1 LED4 LED3 STM8A STM8S PH0 LED4 1.3 Firmware description The firmware library includes the GPIO driver that supports all GPIO features through a set of functions. Examples for most of these features have been created to illustrate their use, and they are provided together with the STM8 firmware library. The current example is provided as GPIO example 1 in the STM8 firmware library. The firmware does the following: It initializes four GPIOs in output push-pull mode to drive four LEDs (LED1, LED2, LED3 and LED4). It initializes one GPIO in input mode with pull-up and no interrupt to read the key button. If the STM8/128-EVAL evaluation board is used, the PC0 pin is connected to the key button and pins PH0 to PH3 are connected to LEDs 4, 3, 2 and 1 respectively. 3/6

4 Example 2: Toggling and reading I/Os in interrupt mode AN2667 The STM8A device does the following: After reset, LED1 and LED4 blink and LED2 and LED3 are switched off. If the key button is pressed continuously, LED2 and LED3 blink and LED1 and LED4 are switched off. When the key button is released, LED1 and LED4 blink and LED2 and LED3 are switched off. The last two states are executed in an infinite loop inside the main routine. 2 Example 2: Toggling and reading I/Os in interrupt mode 2.1 Overview This example describes how to use the GPIO library functions to toggle and read different I/Os of the STM8A device in interrupt mode. 2.2 Hardware description The main hardware connections are shown in Figure Firmware description The current example is provided as GPIO example 2 in the STM8 firmware library. The firmware does the following: It initializes four GPIOs in output push-pull mode to drive four LEDs (LED1, LED2, LED3 and LED4). It initializes one GPIO in input mode with pull-up and interrupt to read the key button. The external interrupt sensitivity is set to falling edge only. If the STM8/128-EVAL evaluation board is used, the PC0 pin is connected to the key button and pins PH0 to PH3 are connected to LEDs 4, 3, 2 and 1 respectively. The STM8A device does the following: After reset, LED1 and LED4 blink and LED2 and LED3 are switched off. If the key button is pressed, LED2 and LED3 blink and LED1 and LED4 are switched off. If the key button is pressed again, LED1 and LED4 blink and LED2 and LED3 are switched off. Every time the key button is pressed, toggling between the three states above is induced. The last three states are executed in an infinite loop inside the main routine. 4/6

5 Revision history 3 Revision history Table 1. Document revision history Date Revision Changes 07-Apr Initial release 5/6

6 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 6/6

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