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IBM v1 outline
We use the Bus Pirate to interface a brand new chip with out writing code or designing a PCB. in line with your remarks, and their experience the usage of the long-established Bus Pirate to demonstrate numerous constituents, they up-to-date the design with new points and more cost-effective accessories.
There’s also a firmware update for each Bus Pirate hardware types, with malicious program fixes, and a pc AT keyboard decoder. take a look at the brand new Hack a Day Bus Pirate page, and browse the Bus Pirate source code in their Google code SVN repository.
We cowl the design updates and interface a digital to analog converter under.
The Bus Pirate begun as a collection of code fragments they used to look at various new chips without infinite collect-software-run construction cycles. They launched it in a how-to and used it to reveal a bunch of serial interface ICs in their elements posts. this text introduces an updated design with new points and a bunch of advancements.
click for a full dimension schematic graphic (PNG). The circuit and PCB are designed the use of the freeware version of Cadsoft Eagle. the entire information for this undertaking are protected in the challenge archive linked on the conclusion of the article.
We used a Microchip PIC24FJ64GA002 28pin SOIC microcontroller (IC1) during this project. The power pins have 0.1uF pass capacitors to floor (C1,2). the 2.5volt inside regulator requires a 10uF tantalum capacitor (C20). The chip is programmed through a five pin header (ICSP). A 2K pull-up resistor (R1) is required for the MCLR characteristic on pin 1. study more about this chip in their PIC24F introduction.
a reasonable MAX3232CSE RS232 transceiver (IC2) interfaces the PIC to a computer serial port. This chip replaces the costly through-hole MAX3223EEPP+ used in the old edition of the Bus Pirate. The serial interface will work with a USB->serial adapter.
Bus pull-up resistors
The normal Bus Pirate has three.3volt pull-up resistors on 2 pins, however most of their tests required additional exterior resistors. The up-to-date design has pull-up resistors (R20-23) on the three leading bus alerts (facts in, facts out, clock) and the chip select (CS) pin.
A row of jumpers (SV5) connects each resistor to an external voltage offered in the course of the Vext terminal (X4). via-hole resistors are used like jumper-wires to make the PCB more straightforward to etch at domestic.
We couldn’t find an elegant option to control an arbitrary voltage pull-up resistor array from a 3.3volt microcontroller. if you have any ideas, please share them within the comments.
VR1 is a three.3volt supply for the microcontroller and RS232 transceiver. VR2 is a 5volt give. each require two 0.1uF pass capacitors (C3-C6). J1 is an influence deliver jack for a standard 2.1mm DC barrel plug. 7-10volts DC is doubtless the most appropriate vigor deliver range.
The normal Bus Pirate had dual energy supplies, 3.3volts and 5volts, so most ICs could be interfaced without an additional energy give. an immense annoyance become the lack of an influence reset for linked chips. If a misconfigured IC needed to be vigor-cycled, they needed to disconnect a wire. They received so tired of this events that they brought a utility controlled reset to the up-to-date design.
VR3 (three.3volts) and VR4 (5volts) are TI TPS796XX voltage regulators with an permit switch. A high degree on pin 1 allows for the regulator. A pull-down resistor (R13,R12) ensures that the regulators are off when the PIC isn’t actively using the road, corresponding to all over power-up initialization. The datasheet specifies a hefty capacitor on the input (C23, C21) and output (C24, C22) pins, they used the identical 10uF tantalum they use all over the place. An extra, optional, 0.1uF capacitor (C12,C11) can enrich legislation.
The switchable regulators are powered by means of VR2, a 5volt deliver. They did this because the maximum input for VR3 and VR4 is 6volts, leaving the equipment with a narrow 5.2-6volt power deliver latitude. VR2 will work neatly above 10volts, and provides an sufficient supply for the other regulators.
VR3 (three.3volts) has plenty of headroom to function from a 5volt give. VR4 (5volts) will lose about 0.2volts, however four.8volts continues to be neatly inside the appropriate range for most 5volt chips. In observe, and under mild loads, they see lower than 0.1volts drop-out from VR4.
Voltage monitoring is a brand new characteristic we’re basically enthusiastic about. Has your assignment ever mysteriously stopped responding on account of an accidental short circuit? The Bus Pirate’s vigor supplies are equipped with voltage monitoring that can detect a metamorphosis in power tiers.
each monitored signal is linked to an analog to digital converter (ADC) through a resistor voltage divider. Two 10K resistors (R10,R11 above) divide the input voltage in half, making it feasible to measure up to six.6volts with the three.3volt PIC microcontroller.
The Bus Pirate has four voltage displays. The 3.3volt and 5volt vigor components are monitored, as is the external voltage fed to the pull-up resistors. A fourth video display is related to pin 9 of the output header to make a voltage probe.
click for a full size placement diagram (PNG). The board is a quasi single-sided design, they etched ours in the lab on a single-sided image-withstand PCB. on the precise, close C13, two jumper wires meet at a single via; they soldered one jumper wire to the other on the back of the board.
part recordcomponentValue 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 ten thousand ohm resistor (0805) R20-23 2.2K–10K ohm resistor (through-hole) LED1,2 LED (0805) J1 2.1mm vigour jack X2,X4 screw clamp (2 terminals) *untested X3 db9 female serial port connector *untested ICSP 0.1″ pin header, immediatelySV4 0.1″ pin header or shrouded header SV5 0.1″ pin header, straight
The firmware is written in C using the free demonstration edition of the PIC C30 compiler. gain knowledge of all about working with this PIC in their introduction to the PIC 24F series.
The latest firmware is posted on the Hack a Day Bus Pirate page. The latest supply is in their Google Code SVN repository.
the usage of it
The diagram above suggests the Bus Pirate pinout.
We made a cable with alligator clips on the end, and added labels to every wire so they don’t must consult with this table every time they interface a new chip.
if you recognize 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 practically a programmable voltage divider. They’re advantageous for recreating waveforms, similar to audio alerts. An 8bit DAC has 255 even intervals between 0 and the reference voltage, the L part they used has an internal 2.5volt reference.
The LTC2640 most effective comes in a small SOT223-eight kit, so they made a breadboard adapter within the profile of a DIP-8 chip. Their LTC2640 footprint is blanketed within the task archive connected at the end of this article.
The schematic above suggests their check circuit for the LTC2640. It requires a 2.7-5volt vigor provide, they used the Bus Pirate’s 3.3volt give. C1 is a skip capacitor between the vigour pin and floor. Pin eight is an energetic-low reset pin, tie it excessive for common operation. Pin 7 is the DAC output, join the Bus Pirate voltage measurement probe (ADC) right here.Bus Pirate LTC2640 (pin #) MOSI SDI (3) CLOCK SCK (2) CS CS/LD (1) ADC VOUT (7) +three.3volts CLR (eight ) +three.3volts VDD (5) GND GND (four)
We related the Bus Pirate to the LTC2640 as proven within the desk. The LTC2640 doesn’t have a data output pin, this SPI connection remains unused.
The Bus Pirate’s hardware SPI library and software RAW3WIRE library are compatible with the LTC2640’s SPI interface. They used the SPI library; if you use the RAW3WIRE library be sure to opt for typical pin output.
HiZ>m<–choose mode 1. HiZ 2. 1-cord3. UART four. I2C 5. SPI 6. JTAG 7. RAW2WIRE 8. RAW3WIRE 9. computer AT KEYBOARD MODE>5<–SPI or RAW3WIRE 900 MODE SET Set pace: 1. 30KHz 2. 125KHz 3. 250KHz 4. 1MHz pace>1 <–check at low speed … 102 SPI able 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 alternate options for all of them. After SPI mode is in a position they deserve to configure the power give.
SPI>p<–vigor supply setup W/w toggles 3.3volt supply? 1. NO 2. certainMODE>2<–use 3.3volt give W/w toggles 5volt deliver? 1. NO 2. convincedMODE>1<–don’t use 5volt supply 9xx deliver CONFIGURED, USE W/w TO TOGGLE 9xx VOLTAGE display screen: 5V: 0.0 | three.3V: 0.0 | VPULLUP: 0.0 | SPI>
p opens the Bus Pirate energy deliver menu. They use the 3.3volt provide however no longer the 5volt deliver. The voltage computer screen verifies that the energy supplies are off.
SPI>W<–capital W (foolish CSS) enables power deliver 9xx 3.3VOLT deliver ON SPI>v<–voltage computer screen 9xx VOLTAGE display screen: 5V: 0.0 | 3.3V: 3.3 | VPULLUP: 0.0 | SPI>
Capital ‘W’ enables any vigor resources selected within the previous menu, a small ‘w’ disables them. V displays the deliver voltage monitor, which now shows 3.3volts output from the 3.3volt supply.
Now that configuration is finished, they are able to send instructions 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 accessible in eight,10, and 12bit versions; the 8bit version makes use of the first byte to set the DAC cost, and ignores the second byte.
SPI>[0b00110000 255 0]<–set DAC to fulla hundred and ten SPI CS ENABLED 120 SPI WRITE: 0x30<–write DAC command a hundred and twenty SPI WRITE: 0xFF<–DAC cost one hundred twenty SPI WRITE: 0x00<–don’t care 140 CS DISABLED SPI>
each SPI command begins through enabling the chip choose 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 will 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 dimension. The DAC output voltage is one hundred% (255/255) of the inner reference, 2.5volts.
SPI>[0b00110000 0 0] d 110 SPI CS ENABLED 120 SPI WRITE: 0x30<–write DAC command 120 SPI WRITE: 0x00<–DAC price one hundred twenty SPI WRITE: 0x00<–don’t care a hundred and forty CS DISABLED 9xx VOLTAGE PROBE: 0.0VOLTS<–DAC output SPI>
The equal command with a DAC cost of 0 outputs 0% (0/255) of two.5volts; 0volts.
SPI>[0b00110000 128 0] d 110 SPI CS ENABLED one hundred twenty SPI WRITE: 0x30<–write DAC command a hundred and twenty SPI WRITE: 0x80<–DAC price one hundred twenty SPI WRITE: 0x00<–don’t care one hundred forty CS DISABLED 9xx VOLTAGE PROBE: 1.2VOLTS<–DAC output SPI>
A DAC cost of 128 is ready 50% (128/255) of the reference voltage, 1.2volts.
SPI>[0b01000000 0 0] d 110 SPI CS ENABLED 120 SPI WRITE: 0x40<–energy down command a hundred and twenty SPI WRITE: 0x00<–don’t care one hundred twenty SPI WRITE: 0x00<–don’t care 140 CS DISABLED 9xx VOLTAGE PROBE: 0.0VOLTS<–DAC off SPI>
The LTC2640 has a low energy mode, caused by using the command 0b01000000 and two bytes which are not noted. After the energy down command they will determine that there’s output from the DAC. Write any DAC cost to exit low vigor mode.
Taking it extra
What’s the next step for the Bus Pirate? We’ll ultimately make a last replace to the design that includes USB on a professionally made, double-sided PCB. vigor provide indicator LEDs had been slated for this version, but didn’t get covered. it might also be effortless to have an AT keyboard connector for debugging with out a laptop. check out the roadmap and wishlists on the Hack a Day Bus Pirate web page.
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