Please see all COVID-19 updates here as some shipments may be delayed due to CDC safety and staffing guidelines. If you have an order or shipping question please refer to our Customer Support page. For technical questions please check out our Forums. Thank you for your continued support.

Member #15030

Member Since: February 10, 2007

Country: United States

  • Has anyone tried to interact with this breakout board via a bus pirate in SPI mode? I have connected the bus pirate to the ADXL345 breakout board and also connected a Saleae Logic Analyzer (e.g. I can see bus pirate driving SPI reasonably). The problem is I see no response from the ADXL345. The odd thing is when I toggle the power (bus pirate "W" and "w" command), the voltage varies between 3.3 and 2.5volts respectively. In other words, there appears to be some back current. I have tired this on two different ADXL345 breakout boards with the same results.

    While I see lots of code using this device in I2C mode, I find very little on using in via SPI. Anybody have any insights into what is happening,...why the odd back current on Vcc when powered off?

    BTW I am able to successfully interact with a LIS3DH accelerometer in SPI mode just fine with this same bus pirate.

    Some details about my Bus Pirate Bus Pirate v3.a Firmware v6.1 r1676 Bootloader v4.1 DEVID:0x0447 REVID:0x3043 (xxxxxxxxxxxxx) http://dangerousprototypes.com

    The Bus Pirate command sequence use for testing: setup and read DEVID register (0x00)

    HiZ>m 1. HiZ 2. 1-WIRE 3. UART 4. I2C 5. SPI 6. 2WIRE 7. 3WIRE 8. LCD x. exit(without change)

    (1)>5 Set speed: 1. 30KHz 2. 125KHz 3. 250KHz 4. 1MHz

    (1)>4 Clock polarity: 1. Idle low *default 2. Idle high

    (1)>2 Output clock edge: 1. Idle to active 2. Active to idle *default

    (2)>2 Input sample phase: 1. Middle *default 2. End

    (1)> CS: 1. CS 2. /CS *default

    (2)> Select output type: 1. Open drain (H=Hi-Z, L=GND) 2. Normal (H=3.3V, L=GND)


No public wish lists :(