Support for the Microduino CoreRF board. More...
Support for the Microduino CoreRF board.
The board is just a breakout for the ATmega128RFA1 MCU.
|Core Frequency||8MHz (16MHz no power save mode)|
|Oscillators||32.768 kHz & 16 MHz|
|Timer||6 ( 2x8bit & 4x16bit )|
|ADCs||1x 15 channel 6 to 12-bit|
|SPIs||3 (1 SPI & 2 USART SPI)|
|I2Cs||1 (called TWI)|
|Vcc||1.8V - 3.6V|
|Datasheet / Reference Manual||Datasheet and Reference Manual|
|Board Manual||Wiki Page|
The MCU comes with a 2.4 GHz IEEE 802.15.4 radio that is compatible with the Atmel AT86RF23x line of transceivers with the only difference being that it is not being accessed over an SPI bus, but instead the radio registers are directly mapped into memory.
According to the wiki, SPI and I2C pins are the following:
|SPI||Original Pin Name||Map Pin Name|
|I2C||Original Pin Name||Map Pin Name|
Flashing RIOT on the CoreRF is done using the SPI method. Using a cheap FT232H breakout board, connect the board as follows:
Now you can simply type
make flash BOARD=microduino-corerf
This should take care of everything!
You will need a separate adapter for UART:
When the external crystal oscillator is used as system clock and the device is put into deep sleep mode it seems that the clocks for all peripherals are enabled and set to the smallest divider (highest frequency). This leads to a higher power consumption. When the device should be put into deep sleep it is recommended to use the internal RC oscillator as system clock source.
More pins can be used for hardware interrupts using the Pin Change Interrupt feature. See ATmega common for details.
The ATmega128RFR1 supports JTAG debugging. To use the JTAG debugging an external JTAG debugger is required. There are several options for this MCU/board:
AVR JTAGICE mkII JTAGICE3 AVR Dragon
Hint: The AVR Dragon is the
cheapest least expensive debugger and also is compatible with almost every AVR MCU.
AVR_DEBUGDEVICEenvironment variable to the required flag to pass to AVaRICE, e.g. when using the Atmel-ICE you have to export
AVR_DEBUGDEVICE=--edbg. If the debug device is not connected via USB, you also need to export
AVR_DEBUGINTERFACEto the correct value.
|Pin||Pin Label||Signal||AVR Dragon Pin|
Be aware that changing the fuse settings can "brick" your MCU, e.g. if you select a different clock setting that is not available on your board. Or if you disable all options for programming the MCU.
You can always de-brick your MCU using high voltage programming mode, which can also be done using the AVR Dragon. But being careful to not brick your MCU in the first place is clearly the better option ;-)
In the following it is assumed that you connect the Dragon ISP header to the Microduino CoreRF for ISP programming.
The default fuse settings of the Microduino CoreRF are:
E:F5, H:DA, L:FF. These settings can be restored via from the OCD settings via:
If you touched other fuse settings, you can restore the fuse settings using:
To enable on-chip debugging, the
JTAGEN (enable JTAG) and the
OCDEN (enable on-chip debugging) bits should be set:
E:F5, H:1A, L:FF. This can be done (when starting with the default settings) via:
|Board specific definitions for the Microduino CoreRF board. |
|Peripheral MCU configuration for the Microduino CoreRF board. |