Touch controls implemented using the STMTouch firmware library occupy a low memory footprint and require minimal use of STM8 peripherals, allowing developers to consolidate user-interface and application tasks in a single device.
“Customers have already achieved some notable product and commercial successes using our first-generation firmware, including Bluetooth headset, PC and printer products,” said Jean-Philippe Dumas, Product Line Marketing Manager, Microcontroller Division, STMicroelectronics. “Our latest enhancements to the STM8 touch sensing firmware library will improve performance and drive further integration of touch-enabled user interfaces in products such as kitchen appliances, mobile devices, multimedia products and professional equipment.”
To complement the enhanced second-generation firmware, the STMTouch development platform adds a new evaluation board supporting the ultra-low-power STM8L family and also features STM Studio software enabling developers to tune touch-sensing parameters. STM Studio is a PC-based tool offering an easy-to-use GUI that provides visual indication of sensor responses. The development platform also features an STM8S evaluation board, as well as the API description, application notes, code examples, and layout recommendations for production boards. C-compiler support has also been expanded, as the latest release is compatible with Cosmic, IAR and Raisonance compilers.
Major features of the STM8 touch sensing firmware library:
* Complete library with acquisition, post processing and API layers
* C source code provided
* Up to 24 keys and two wheels/sliders supported
* Support for both charge-transfer and RC-timing touch detection
* Enhanced processing features for optimized sensitivity and immunity
* Active shield feature
* Automatic calibration software
* Built-in compensation of environmental fluctuations