frautenberg / logic-analyzer

simple and cheap 16 channel logic analyzer based on Cypress CY7C68013A development board

Logic-Analyzer

simple and cheap 16 channel logic analyzer based on Cypress CY7C68013A development board

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What is the Logic Analyzer

A logic Analyzer can only measure high and low level on a Signal.

With the recommended software Sigrok more than 110 different protocols like I2C, SPI, CAN.. can be recorded and visually decoded.

Time resolutions at ~1 MHz (ΔT: 1µs), perfect for hobby application.

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Initial setup

Required hardware:

• Cypress CY7C68013A development board (~5€)

• Logic-Analyzer Shield (optional, but with better pinout then original)

Required Software:

• Sigrok (Application: Pulseview) used as Open-Source signal analysis software suite
• Zadig (is included in Pulseview) used for configuring Cypress USB controller for Windows

Step 1: Install drivers

• In the application Zadig -> Options -> List all devices: enable

• Select "Cypress FX2LP"

• Select "WinUSB" driver

• Start installing via "Replace Driver"

  

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  Step 2: Open Pulseview

  • Connect the Cypress board and open Pulseview
  • Connect to Device -> choose "fx2lafw" -> USB -> click button "Scan for device" -> select "Cypress FX2"
    • if this fails or no device shows up, jump to Step 3
  • Now everything is setup

  

  Step 3: Install drivers (again)

  • Open Zadig and select the new device "fx2lafw"
  • Also replace their driver with "WinUSB"
  • Retry Step 2

  

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Example

Situation: The Arduino is sending the Serial message (UART) "Hello World" to the computer

Circuit:

• The Arduino and the Logic Analyzer have the same ground potential

• The TX Pin of the Arduino is wired to channel 0 of the Logic Analyzer

​ The signal D0 is shown and decoded with the included UART Decoder to "Hello World"

Logic Analyzer Hat

Troubleshooting

Pulseview doesn't recognize the Cypress Logic Analyzer

• Redo Steps 1 to 3. Windows sometimes forgets the newly installed drivers

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Hardware Maximums

Pulseview offers higher sampling frequency's but the recording time lowers to ~ 300ms. The system is thereby getting unstable