ST刚刚发布基于STM8系列MCU的电容触摸感应固件库，相信基于STM32的库也很快就会提供。
下载地址：
http://www.st.com/mcu/files/mcu/1234113356.exe
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STM8 TOUCH SENSING LIBRARY
Release Notes
================================================================================
V1.0.0 / 22-JAN-2009
--------------------
- First official release.
- Add clearing of POSCHANGED flag in multichannel.c file.
V0.2.0 / 19-DEC-2008
--------------------
- Second Beta release.
- MCKey I/Os can now be individually mapped on any port/pin.
- Add MCKeys constant tables to support Wheel and Slider with Interleaved or
Normal electrodes layout.
- MCKey "direction change" parameters put in the Configuration.h file.
This feature can now be enabled or disabled.
- Correct bug with DetectionTimeOut on MCKey.
- Add check of rejection counter in all SCKey/MCKey treatment routines.
- Improvement of IO acquisition:
- add rejection counter in the channel structure
- change calculation method of measurements min/max limits
- add driven shield mask
- set "noise" flag if the number of rejected measures is reached
- Improvement of "configuration.h" file:
- NUMBER_OF_SINGLE_CHANNEL_KEYS and NUMBER_OF_SINGLE_CHANNEL_PORTS are removed.
- add MCKEYx_LAYOUT_TYPE to distinguish between Interleaved and Normal electrodes layout.
- add GPIOx_ELECTRODES_MASK (replace SCKEYx_BITS and MCKEYx_BITS definitions).
- add SCKEY_Px and MCKEYx DRIVEN_SHIELD_MASK
- Improvement of "checkconfig.h" file:
- NUMBER_OF_SINGLE_CHANNEL_KEYS and NUMBER_OF_SINGLE_CHANNEL_PORTS are
automatically calculated.
V0.0.9 / 30-OCT-2008
--------------------
- Add an adjustment after the Delta value calculation.
- Add new position offset tables for slider.
- In the io driver, the interruptions are disabled before changing the I/O configuration.
V0.0.8 / 20-OCT-2008
--------------------
- Add new parameter in the configuration file to define the MCkey type (wheel or slider).
- Add a filtering on Delta2 value during MCKey position calculation.
- Change position calculation on slider.
- Add 100ms timer flag to be used by the application layer.
V0.0.7 / 09-OCT-2008
--------------------
- STM8_TSL_RC_CheckConfig.h file added.
- SINGLE_CHANNEL_GROUP_2_USED and SINGLE_CHANNEL_GROUP_3_USED replaced by
NUMBER_OF_SINGLE_CHANNEL_PORTS.
V0.0.6 / 08-OCT-2008
--------------------
- Change all naming SCKEYn by SCKEY_Pn (with n = 1 to 3).
- Add TSLState_T enum typedef.
- Add pragma section TSL_IO_ALCODE for aligning the 3 io driver functions.
- Change the STM8L timers (TIM3 -> TIM4 for generic timebase and TIM2 -> TIM3 for vih/vil)
due to the use of the latest STM8L standard fw library V0.0.2
--> the timers used on STM8L and STM8S are now the same.
- Function TSL_Tick_500us changed by TSL_Tick_Base.
V0.0.5 / 01-OCT-2008
--------------------
- Modifications for MISRA compliancy.
V0.0.4 / 15-SEP-2008
--------------------
- Doxygen documentation format added.
- Astyle software run on all files.
V0.0.3 / 04-SEP-2008
--------------------
- Conditional compilation added on pragma sections.
- type.h and macro.h inclusion removed.
- GPIO_TypeDef used from standard peripherals Library.
V0.0.2 / 23-JUL-2008
--------------------
- Bug correction in timer counter reading.
V0.0.1 / 23-JUL-2008
--------------------
- First Alpha release.
======================== (c) 2008 STMicroelectronics ==========================
外围硬件电路很简单，如下图，支持按键、滑轮。
我最关心的分辩率看ST的手册是
MCKey resolution and direction change parameters
MCKEY_RESOLUTION_DEFAULT
Defines the default resolution for Multi-channels keys.
This parameter can take a value between 1 (1-bit resolution) to 8 (8-bit resolution).
A Low value will result in a low resolution and will be less subject to noise. A High value will result in a high resolution and will be more subject to noise.
Typical value: 4
ST还应该提供一个layout的说明。
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