IOExpander_Example

  ******************** (C) COPYRIGHT 2010 STMicroelectronics *******************
  * @file    I2C/IOExpander/readme.txt 
  * @author  MCD Application Team
  * @version V3.4.0
  * @date    10/15/2010
  * @brief   Description of the I2C and STMPE811 IO Expander communication 
  *          example.
  ******************************************************************************
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  ******************************************************************************
   
Example Description

This firmware provides an example of configuring and using the IO Expander STMPE811 in order to control input Joystick IOs, output IOs and the Touch Screen feature. This example provides the elementary steps to control the following modules and use them in an application: The IO pins are used for:

The input information can be used either in Polling mode (uncomment the define define IOE_POLLING_MODE) or in Interrupt mode (uncomment the define define IOE_INTERRUPT_MODE). These defines are in main.h file.

After configuring the IO Expander modules and Interrupts (if needed), the output IOs are set to their default state. These operations are done by the functions: IOE_Config() and IOE_ITConfig(). If the IO Expander is not operational (or the I2C pins are not in the correct level) the IOE_Config() function returns a value different from 0 and a message is displayed on the LCD screen.

To get the status of an input:

Besides, the examples checks the status of the other Push-Buttons implemented on the board (Key, Tamper and WakeUp push-buttons). They are checked in parallel with the IO Expander IOs and the LCD display and LEDs are updated according to the push buttons state.

Directory contents
Hardware and Software environment

In order to make the program work, you must do the following :

Tip: You can tailor the provided project template to run this example, for more details please refer to "stm32f10x_stdperiph_lib_um.chm" user manual; select "Peripheral Examples" then follow the instructions provided in "How to proceed" section.

Note:
  • Low-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
  • Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
  • Medium-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
  • Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
  • High-density Value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.
  • High-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.
  • XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 512 and 1024 Kbytes.
  • Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.

© COPYRIGHT 2010 STMicroelectronics

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