Difference between revisions of "BeagleBone Black RFID Adaptor Cape"
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== Description == | == Description == | ||
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The RFID adaptor cape is an interface between the Beaglebone Black (BBB) and Texas Instrument's TRF7970ATB, (Multi-Protocol Fully Integrated 13.56-MHz RFID and NFC Transceiver) It allows users to have fully functional RFID and NFC capabilities on the BBB. The adaptor board also features four additional LEDs and a push button. | The RFID adaptor cape is an interface between the Beaglebone Black (BBB) and Texas Instrument's TRF7970ATB, (Multi-Protocol Fully Integrated 13.56-MHz RFID and NFC Transceiver) It allows users to have fully functional RFID and NFC capabilities on the BBB. The adaptor board also features four additional LEDs and a push button. | ||
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== Schematic == | == Schematic == | ||
− | [[File:RFID Cape Schematic.png|thumb|400px| | + | [[File:RFID Cape Schematic.png|thumb|400px|left|RFID Adaptor Cape Schematic]] |
− | [[File:RFID Cape Layout.png|thumb| | + | [[File:RFID Cape Layout.png|thumb|500px|center|RFID Adaptor Cape Layout]] |
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== Sample Code == | == Sample Code == |
Revision as of 20:56, 23 July 2013
Contents
Description
The RFID adaptor cape is an interface between the Beaglebone Black (BBB) and Texas Instrument's TRF7970ATB, (Multi-Protocol Fully Integrated 13.56-MHz RFID and NFC Transceiver) It allows users to have fully functional RFID and NFC capabilities on the BBB. The adaptor board also features four additional LEDs and a push button.
The communication between the BBB and the TB is via SPI. Since SPI pins are not automatically enabled on BBB, a device tree overlay is used to configure the pins properly for SPI use.
Schematic
Sample Code
SPI Device Tree Overlay Setup
NOTE: You CAN NOT use SPI1 on the BeagleBone Black WITHOUT disabling the HDMI interface
Create a file called BB-SPI1-01-00A0.dts and copy-paste the following code into the file
/dts-v1/; /plugin/; / { compatible = "ti,beaglebone", "ti,beaglebone-black"; /* identification */ part-number = "spi1mux"; fragment@0 { target = <&am33xx_pinmux>; __overlay__ { spi1_pins_s0: spi1_pins_s0 { pinctrl-single,pins = < 0x190 0x33 /* mcasp0_aclkx.spi1_sclk, INPUT_PULLUP | MODE3 */ 0x194 0x23 /* mcasp0_fsx.spi1_d0, INPUT_PULLDOWN | MODE3 */ 0x198 0x03 /* mcasp0_axr0.spi1_d1, OUTPUT_PULLDOWN | MODE3 */ 0x19c 0x13 /* mcasp0_ahclkr.spi1_cs0, OUTPUT_PULLUP | MODE3 */ >; }; }; }; fragment@1 { target = <&spi1>; __overlay__ { #address-cells = <1>; #size-cells = <0>; status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&spi1_pins_s0>; cs-gpios = <&gpio4 17 0>; spidev@0 { spi-max-frequency = <16000000>; reg = <0>; /* Use 0 if you want CS0 */ compatible = "linux,spidev"; spi-cpha; }; }; }; };
Compile the dtc:
dtc -O dtb -o BB-SPI1-01-00A0.dtbo -b 0 -@ BB-SPI1-01-00A0.dts
Then, copy the file into /lib/firmware/:
cp BB-SPI1-01-00A0.dtbo /lib/firmware/
Then enable the device tree overlay:
echo BB-SPI1-01 > /sys/devices/bone_capemgr.*/slots
Plug in your BBB to a host computer using the mini usb data cable.
Go to My Computer>BeagleBone Getting Started> and open uEnv.txt Copy and paste this command into the .txt file. Make sure to save your changes. (Ctrl+s)
optargs=quiet drm.debug=7 capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN capemgr.enable_partno=BB-SPI1-01
after you save the changes, reboot your beaglebone black
Make sure it is enabled
You should now have two spidev-files in the folder /dev/
ls -al /dev/spidev1.*