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How-to: Bus Pirate V1, more suitable widespread Serial Interface | 00M-657 test Questions and real questions
We use the Bus Pirate to interface a brand new chip with out writing code or designing a PCB. in response to your feedback, and their adventure using the common Bus Pirate to demonstrate various materials, they up to date the design with new aspects and cheaper add-ons.
There’s also a firmware update for each Bus Pirate hardware versions, with bug fixes, and a laptop AT keyboard decoder. take a look at the new Hack a Day Bus Pirate web page, and browse the Bus Pirate source code in their Google code SVN repository.
We cover the design updates and interface a digital to analog converter beneath.
The Bus Pirate all started as a collection of code fragments they used to check new chips devoid of countless bring together-program-run construction cycles. They released it in a how-to and used it to show a bunch of serial interface ICs in their components posts. this article introduces an up-to-date design with new facets and a bunch of advancements.
click on for a full measurement schematic image (PNG). The circuit and PCB are designed using the freeware version of Cadsoft Eagle. all the files for this challenge are covered in the assignment archive linked on the conclusion of the article.
We used a Microchip PIC24FJ64GA002 28pin SOIC microcontroller (IC1) in this undertaking. The power pins have 0.1uF pass capacitors to floor (C1,2). the two.5volt interior regulator requires a 10uF tantalum capacitor (C20). The chip is programmed via a five pin header (ICSP). A 2K pull-up resistor (R1) is required for the MCLR characteristic on pin 1. read extra about this chip in their PIC24F introduction.
an inexpensive MAX3232CSE RS232 transceiver (IC2) interfaces the PIC to a computer serial port. This chip replaces the costly via-gap MAX3223EEPP+ used within the previous version of the Bus Pirate. The serial interface will work with a USB->serial adapter.
Bus pull-up resistors
The usual Bus Pirate has three.3volt pull-up resistors on 2 pins, however most of their exams required further exterior resistors. The up-to-date design has pull-up resistors (R20-23) on the three leading bus signals (information in, records out, clock) and the chip opt for (CS) pin.
A row of jumpers (SV5) connects each and every resistor to an exterior voltage presented throughout the Vext terminal (X4). via-hole resistors are used like jumper-wires to make the PCB less demanding to etch at home.
We couldn’t discover an elegant technique to control an arbitrary voltage pull-up resistor array from a three.3volt microcontroller. if in case you have any concepts, please share them in the feedback.
VR1 is a 3.3volt supply for the microcontroller and RS232 transceiver. VR2 is a 5volt supply. each require two 0.1uF bypass capacitors (C3-C6). J1 is a power deliver jack for a typical 2.1mm DC barrel plug. 7-10volts DC is likely the top-rated vigour deliver latitude.
The common Bus Pirate had twin vigor resources, three.3volts and 5volts, so most ICs can be interfaced with out an extra energy provide. an enormous annoyance changed into the shortcoming of an influence reset for linked chips. If a misconfigured IC necessary to be energy-cycled, they had to disconnect a wire. They obtained so uninterested in this activities that they added a application managed reset to the up to date design.
VR3 (3.3volts) and VR4 (5volts) are TI TPS796XX voltage regulators with an enable switch. A excessive degree on pin 1 permits the regulator. A pull-down resistor (R13,R12) ensures that the regulators are off when the PIC isn’t actively driving the line, corresponding to during power-up initialization. The datasheet specifies a hefty capacitor on the input (C23, C21) and output (C24, C22) pins, they used the equal 10uF tantalum they use all over the place. An extra, non-compulsory, 0.1uF capacitor (C12,C11) can enhance legislation.
The switchable regulators are powered by using VR2, a 5volt supply. They did this since the highest enter for VR3 and VR4 is 6volts, leaving the gadget with a slim 5.2-6volt power provide latitude. VR2 will work well above 10volts, and offers an enough deliver for the different regulators.
VR3 (3.3volts) has lots of headroom to function from a 5volt supply. VR4 (5volts) will lose about 0.2volts, but 4.8volts remains well within the suitable range for most 5volt chips. In practice, and under easy masses, they see under 0.1volts drop-out from VR4.
Voltage monitoring is a brand new characteristic we’re truly excited about. Has your venture ever mysteriously stopped responding as a result of an accidental short circuit? The Bus Pirate’s energy elements are outfitted with voltage monitoring that may realize a transformation in vigour tiers.
every monitored sign is connected to an analog to digital converter (ADC) via a resistor voltage divider. Two 10K resistors (R10,R11 above) divide the enter voltage in half, making it possible to measure up to six.6volts with the three.3volt PIC microcontroller.
The Bus Pirate has 4 voltage displays. The three.3volt and 5volt energy resources are monitored, as is the external voltage fed to the pull-up resistors. A fourth display screen is linked to pin 9 of the output header to make a voltage probe.
click for a full dimension placement diagram (PNG). The board is a quasi single-sided design, they etched ours in the lab on a single-sided picture-withstand PCB. on the suitable, close C13, two jumper wires meet at a single by the use of; they soldered one jumper wire to the different on the back of the board.
part recordpartValue IC1 PIC24FJ64GA002 (SOIC) IC2 MAX3232CSE (SOIC-N) VR1 LD1117S33 3.3volt regulator (SOT223) VR2 LD1117s50 5volt regulator (SOT223) VR3 TPS79633 three.3volt regulator (SOT223-6) VR4 TPS79650 5volt regulator (SOT223-6) C1-13 0.1uF capacitor (0805) C20-24 10uF tantalum capacitor (SMC A) R1 2000 ohm resistor (0805) R2,3 390 ohm resistor (0805) R4-13 10000 ohm resistor (0805) R20-23 2.2K–10K ohm resistor (through-hole) LED1,2 LED (0805) J1 2.1mm power jack X2,X4 screw clamp (2 terminals) *untested X3 db9 feminine serial port connector *untested ICSP 0.1″ pin header, instantlySV4 0.1″ pin header or shrouded header SV5 0.1″ pin header, straight
The firmware is written in C the usage of the free demonstration edition of the PIC C30 compiler. learn all about working with this PIC in their introduction to the PIC 24F collection.
The existing firmware is posted on the Hack a Day Bus Pirate page. The existing supply is in their Google Code SVN repository.
the usage of it
The diagram above indicates the Bus Pirate pinout.
We made a cable with alligator clips on the end, and added labels to every wire so they don’t ought to refer to this table every time they interface a brand new chip.
in case you know of any cool connectors or cables, please link to them in the comments.
LTC2640 SPI digital to analog voltage converter
The Linear technology LTC2640-LZ8 is an 8bit digital to analog converter (DAC) programmed over SPI. A DAC is essentially a programmable voltage divider. They’re helpful for recreating waveforms, akin to audio indicators. An 8bit DAC has 255 even intervals between 0 and the reference voltage, the L half they used has an inner 2.5volt reference.
The LTC2640 handiest comes in a small SOT223-eight kit, so they made a breadboard adapter in the profile of a DIP-8 chip. Their LTC2640 footprint is covered in the mission archive attached at the end of this article.
The schematic above indicates their look at various circuit for the LTC2640. It requires a 2.7-5volt vigour give, they used the Bus Pirate’s three.3volt deliver. C1 is a skip capacitor between the vigor pin and floor. Pin eight is an active-low reset pin, tie it excessive for normal operation. Pin 7 is the DAC output, connect the Bus Pirate voltage dimension probe (ADC) right here.Bus Pirate LTC2640 (pin #) MOSI SDI (three) CLOCK SCK (2) CS CS/LD (1) ADC VOUT (7) +three.3volts CLR (8 ) +3.3volts VDD (5) GND GND (four)
We linked the Bus Pirate to the LTC2640 as proven in the desk. The LTC2640 doesn’t have an information output pin, this SPI connection remains unused.
The Bus Pirate’s hardware SPI library and utility RAW3WIRE library are appropriate with the LTC2640’s SPI interface. They used the SPI library; in case you use the RAW3WIRE library be sure to opt for typical pin output.
HiZ>m<–opt for mode 1. HiZ 2. 1-cordthree. UART 4. I2C 5. SPI 6. JTAG 7. RAW2WIRE 8. RAW3WIRE 9. computing device AT KEYBOARD MODE>5<–SPI or RAW3WIRE 900 MODE SET Set velocity: 1. 30KHz 2. 125KHz three. 250KHz 4. 1MHz speed>1 <–check at low speed … 102 SPI ready SPI>
Press M for the Bus Pirate mode menu, opt for 5 for SPI mode. There are a bunch of configuration alternatives for the SPI module, use the default options for all of them. After SPI mode is ready they need to configure the vigour provide.
SPI>p<–energy supply setup W/w toggles three.3volt supply? 1. NO 2. certainMODE>2<–use 3.3volt deliver W/w toggles 5volt supply? 1. NO 2. certainMODE>1<–don’t use 5volt give 9xx deliver CONFIGURED, USE W/w TO TOGGLE 9xx VOLTAGE monitor: 5V: 0.0 | 3.3V: 0.0 | VPULLUP: 0.0 | SPI>
p opens the Bus Pirate power deliver menu. They use the 3.3volt deliver however no longer the 5volt deliver. The voltage monitor verifies that the vigour supplies are off.
SPI>W<–capital W (foolish CSS) makes it possible for energy supply 9xx 3.3VOLT provide ON SPI>v<–voltage display screen 9xx VOLTAGE monitor: 5V: 0.0 | three.3V: three.3 | VPULLUP: 0.0 | SPI>
Capital ‘W’ allows any energy components selected within the outdated menu, a small ‘w’ disables them. V shows the provide voltage monitor, which now indicates three.3volts output from the 3.3volt deliver.
Now that configuration is complete, they are able to ship commands to the LTC2640 over the SPI bus. The LTC2640 has a 24bit (3byte) interface protocol. the first byte is a command, adopted via two statistics bytes. The LTC2640 is obtainable in 8,10, and 12bit models; the 8bit edition makes use of the primary byte to set the DAC cost, and ignores the 2d byte.
SPI>[0b00110000 255 0]<–set DAC to full110 SPI CS ENABLED a hundred and twenty SPI WRITE: 0x30<–write DAC command 120 SPI WRITE: 0xFF<–DAC price a hundred and twenty SPI WRITE: 0x00<–don’t care 140 CS DISABLED SPI>
every SPI command starts off by means of enabling the chip opt for pin ([). The first byte is the command to update the DAC (0b00110000), followed by the value to output (255), and a third byte that’s ignored (0). The command ends by disabling chip select (]).
We used an 8bit DAC with 255 even voltage steps, output set to 255 is a hundred%. they can use the Bus Pirate voltage probe to measure the output.
SPI>d<–measure voltage 9xx VOLTAGE PROBE: 2.5VOLTS<–DAC output SPI>
D triggers a voltage size. The DAC output voltage is one hundred% (255/255) of the inner reference, 2.5volts.
SPI>[0b00110000 0 0] d a hundred and ten SPI CS ENABLED 120 SPI WRITE: 0x30<–write DAC command one hundred twenty SPI WRITE: 0x00<–DAC value a hundred and twenty SPI WRITE: 0x00<–don’t care a hundred and forty CS DISABLED 9xx VOLTAGE PROBE: 0.0VOLTS<–DAC output SPI>
The identical command with a DAC cost of 0 outputs 0% (0/255) of 2.5volts; 0volts.
SPI>[0b00110000 128 0] d one hundred ten SPI CS ENABLED 120 SPI WRITE: 0x30<–write DAC command one hundred twenty SPI WRITE: 0x80<–DAC value a hundred and twenty SPI WRITE: 0x00<–don’t care 140 CS DISABLED 9xx VOLTAGE PROBE: 1.2VOLTS<–DAC output SPI>
A DAC cost of 128 is about 50% (128/255) of the reference voltage, 1.2volts.
SPI>[0b01000000 0 0] d a hundred and ten SPI CS ENABLED 120 SPI WRITE: 0x40<–energy down command a hundred and twenty SPI WRITE: 0x00<–don’t care 120 SPI WRITE: 0x00<–don’t care 140 CS DISABLED 9xx VOLTAGE PROBE: 0.0VOLTS<–DAC off SPI>
The LTC2640 has a low power mode, brought on by means of the command 0b01000000 and two bytes which are ignored. After the vigor down command they can verify that there’s output from the DAC. Write any DAC cost to exit low vigour mode.
Taking it additional
What’s the next step for the Bus Pirate? We’ll finally make a remaining update to the design that includes USB on a professionally made, double-sided PCB. vigour supply indicator LEDs had been slated for this edition, however didn’t get included. it might even be easy to have an AT keyboard connector for debugging with out a laptop. take a look at the roadmap and wishlists on the Hack a Day Bus Pirate web page.
down load: buspirate.v1a.zip
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