Overview
The LeafLabs Maple is a microcontroller board based on the STM32F103RB microprocessor.
The Maple runs at a maximum of 72 MHz, has 39 digital input/output pins, 16 analog inputs, native full speed USB, 3 USARTs (hardware serial ports), integrated SPI/I2C support, a power jack, and a reset button. Maple is programmable over USB via our provided DFU bootloader, no extra hardware required! Users can also program the onboard program flash via external JTAG interface. Maple offers security support for read/write protected addresses, as well as User and Handler processor modes. It has a real-time sysTick, useful for a real time OS or any timing senstitive applications. Four built-in 16-bit timers will help you here as well. Maple can be powered via USB, a wall adapter, or it can run off of a rechargeable LiPo battery (see below for more info). The Maple is compatible with shields designed for the Arduino Duemilanove or UNO.
Technical Specs
- Microcontroller: STM32 F103RBClock
- Speed: 72 MHzOperating
- Voltage: 3.3V
- Input Voltage (recommended): 3.0V-12V
- Digital I/O Pins: 39
- Analog Input Pins: 16
- Flash Memory: 128 KB
- SRAM: 20KB
- 64 Channel nested vector interrupt handler (including external interrupt on GPIO’s)
- Integrated SPI/I2C and 7 Channels of Direct Memory Access (DMA)
- Supplies up to 800mA @ 3.3v
- Support for low power and sleep modes (<500uA)
- Dimensions: 2.05″x2.1″
Programming
See also Maple Development Environment documentation
Maple can be programmed using an Arduino-style, sketch-based programming environment, which is open-source and can be downloaded online at our website. The Cortex-M3 on Maple comes pre-programmed with a boot-loader – allowing users to upload new code onto it using the USB interface (supported directly by the Cortex-M3), without the need for an external hardware programmer. You can also program the microcontroller directly with an external JTAG interface.
