mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
834bb94987
Added explanation for fuse settings. Brown-out when 1.8V is set as system voltage. Power increase in deep sleep when ext. xtal as system clock.
177 lines
7.7 KiB
Plaintext
177 lines
7.7 KiB
Plaintext
/**
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* @defgroup boards_jiminy-mega256rfr2 Jiminy- Mega256rfr2
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* @ingroup boards
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* @brief Support for the Jiminy Mega 256rfr2 board
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# Overview
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The Jiminy board is a development of the
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[Chair of Integrated Analog Circuits and RF Systems](http://www.ias.rwth-aachen.de/cms/~gair/IAS/?lidx=1)
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(IAS) of the [RWTH Aachen University](https://www.rwth-aachen.de/). We started the project by porting
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RIOT OS to the [Pinoccio.io](https://github.com/Pinoccio/hardware-pinoccio) board. As there where severe
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limitations we designed the Jiminy board which has the the
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[ATmega256rfr2](www.atmel.com/Images/Atmel-8393-MCU_Wireless-ATmega256RFR2-ATmega128RFR2-ATmega64RFR2_Datasheet.pdf)
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MCU as common feature.
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It is Arduino like and features USB programming. The [Bootloader](https://github.com/Josar/arduino_stk500v2)
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is a fork of the Arduino Bootloader with added functionality for internal clock calibration and automatic baud
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rate detection.
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The Jiminy is design as a core board featuring a MCU, RF-transceiver, battery charger and power path management
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IC, a fuel gauge, an adjustable power supply between 1.8V to 3.3V (100mV Steps) and an RGB LED. All unused Pins
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are connected to pin headers.
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An USB C connector is used to connect to the computer or the charger. As USB C supports up to 3 ampere the board
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was designed in regard of fast charging and when connected to the grid or usage of big batteries high current
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supply capability for the shield.
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The shields can be powered either directly from the Charger/battery or from the adjustable converter, the
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converter supply pin can be enabled or disabled by the application. By connecting shields to the core Jiminy
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board, a multitude of wireless applications can be created.
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A first shield for temperature, humidity and soil moisture measurement is also developed at the IAS.
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If there is demand for devices please contact the author of this page for more details.
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# Hardware
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## Pinout
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## Board
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The jiminy board has following ICs and features.
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| Features | Details | Datasheet |
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|:------------- |:--------------------- |:------------- |
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| USB2Serial| ATmega16U2, High-performance, low-power AVR 8-Bit Advanced RISC Architecture | [Link](http://www.microchip.com/wwwproducts/en/ATmega16u2) |
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| MCU | ATmega256, AVR 8-Bit Advanced RISC Architecture |[Link](www.atmel.com/Images/Atmel-8393-MCU_Wireless-ATmega256RFR2-ATmega128RFR2-ATmega64RFR2_Datasheet.pdf) |
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| Transceiver | High performance RF-CMOS 2.4 GHz radio transceiver targeted for IEEE802.15.4, ZigBee, IPv6 / 6LoWPAN, RF4CE, SP100, WirelessHART and ISM applications | above |
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| Li-ion Charger and Power Path | bq24298 , 3A Single Cell USB Charger With Power Path Management|[Link](www.ti.com/lit/ds/symlink/bq24298.pdf) |
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| Fuel Gauge| LC709203F, Fuel Gauge for a single lithium ion battery which provides accurate RSOC information even under unstable conditions (e.g. changes of battery temperature, loading, aging and self-discharge) |[Link](www.onsemi.com/pub/Collateral/LC709203F-D.PDF) |
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| AC Converter | TPS6274x, Output voltage selectable within a range from 1.8V to 3.3V in 100mV steps, output currents up to 300mA | [Link](www.ti.com/lit/ds/symlink/tps62740.pdf) |
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| RGB LED | Cree LED, hardware PWM controlled |[Link](www.cree.com/led-components/media/documents/CLVBAFKA.pdf) |
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## MCU Details
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| MCU | ATmega256RFR2 |
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|:------------- |:--------------------- |
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| Family | ATmega |
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| Vendor | Atmel |
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| Package | QFN/MLF |
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| SRAM | 32Kb |
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| Flash | 256Kb |
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| EEPROM | 8K |
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| Core Frequency | 8MHz (16MHz no power save mode) |
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| Oscillators | 32.768 kHz & 16 MHz |
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| Timers | 6 ( 2x8bit & 4x16bit ) |
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|Analog Comparator | 1 |
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| ADCs | 1x 15 channel 6 to 12-bit |
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| USARTs | 2 |
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| SPIs | 3 (1 SPI & 2 USART SPI) |
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| I2Cs | 1 (called TWI) |
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| Vcc | 1.8V - 3.6V |
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| Datasheet / Reference Manual | [Datasheet and Reference Manual](www.atmel.com/Images/Atmel-8393-MCU_Wireless-ATmega256RFR2-ATmega128RFR2-ATmega64RFR2_Datasheet.pdf) |
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| Board Manual | |
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| Pins | |
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# Implementation Status
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Is an ongoing process ...
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## Jimini Core
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| Driver | Status | Comment |
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|:------------- |:--------------------- |:--------------------- |
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| GPIO (LED) | OK | |
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| Timers | OK | |
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| UART | OK | |
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| TWI, I2C | OK | |
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| PWM | OK | only PWM_left implemented yet |
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| Comparator | OK | |
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| Module | Status | Comment |
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|:------------- |:--------------------- |:--------------------- |
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| Stdio| OK | Output to USB Bridge, used as Terminal |
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| xTimer | OK | |
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| PWM LED | OK | |
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| RTC| OK | |
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| Power Path | OK | |
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| Fuel Gauge| OK | |
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| RF core | Work in progress | |
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| CoAP | Status | Comment |
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|:------------- |:--------------------- |:--------------------- |
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|Device| | |
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|LED| | |
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| Battery | ok | only RSOC so far |
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## Jimini Plant Sensor Shield
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| Module | Status | Comment |
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|:------------- |:--------------------- |:--------------------- |
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| SHT21 | OK | |
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| Soil moisture | OK | |
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| CoAP | Status | Comment |
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|:------------- |:--------------------- |:--------------------- |
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| Temperature | ok | |
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| Humidity | ok | |
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| Soil moisture | ok | when requested the first time the returned value is wrong, after that the correct value is returned |
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# Flashing RIOT
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Flashing RIOT on the Jiminy is quite straight forward, just connect your Jiminy using the USB port
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to your host computer and type:
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`make flash BOARD=jiminy-mega256rfr2`
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This should take care of everything!
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RIOT's Makefile are configured to flash the jiminy using AVRDUDE. The bootloader automatically matches
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to the configured baud rate which is set for AVRDUDE. Rates of up to 500kBaud can be used.
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# Fuse Settings
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Reading out the fuses can be done with
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`avrdude -c wiring -p m256rfr2 -P /dev/ttyACM0 -b 0010005 -v`
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The last line should read
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`avrdude: safemode: Fuses OK (E:FE, H:D0, L:E2)`
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Which describes the fuses as follows:
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E: extended fuse = FE
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H: high fuse = D0
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L: low fuse = E2
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To program the fuses an JTAG programer (Atmel-ICE, Dragon) is needed, they can not be set with the bootloader.
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Connect the programmer JTAG pins with the board pins F4 JTAG TCK, F5 JTAG TMS, F6 JTAG TDO, F7 JTAG TDI,
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GND and VDD with V+ m256rfr2. Alternatively use a pogo pin connector ( e.g. SparkFun ISP Pogo Adapter)
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on the backside of the board.
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To program the fuses default setting execute following line
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`avrdude -c atmelice -p m256rfr2 -U lfuse:w:0xe2:m -U hfuse:w:0xd0:m -U efuse:w:0xfe:m`
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Attention: the default setting above has brown-out detection enabled,
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see troubleshooting when using the board with 1.8V supply.
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# Troubleshooting
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## Using 1.8V as board Voltage
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Setting the TPS6274x output voltage to 1.8V may lead to an undervoltage and thus triggers the brown-out reset.
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Disabling the brown-out detection by setting the extended fuse bit is recommended when a 1.8V supply is used.
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`avrdude -c atmelice -p m256rfr2 -U efuse:w:0xff:m`
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## Using the external crystal oscillator (Transceiver Crystal Oscillator) and deep sleep
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When the external crystal oscillator is used as system clock and the device is put into deep sleep mode it seems that
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the clocks for all peripherals are enabled and set to the smallest divider (highest frequency). This leads to a higher
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power consumption. When the device should be put into deep sleep it is recommended to use the internal RC oscillator
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as system clock source.
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*/
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