Knowing that, and knowing the different pins on whatever controller, including Arduino, you get the pin mapping I provided above.
Both i2c and spi arduino how to#
The datasheet clearly explains how to wire it up for either SPI 4-wire, SPI 3-wire, or I2C. However, they do know whatever pins they need for communication, just like any controller also knows it's own pins for whatever bus. True, no device knows about an Arduino, or RPi, or MS430. So, help anyone? Schematic? Parts (if any)? Much like there are some devices out there that have a jumper on them to switch between 3.3V or 5V operations. I can probably do this with a mechanical switch, but I'm hoping for a simpler (for the end-user) method, just using a jumper to switch things around. If pin 7 is tied to VCC, the device will be in I2C mode, and if it's tied to SS, it'll work in SPI (4-wire) mode. Notice how in both setups, pins 7, 13, and 14 are used. So is there some way to do this? Some way to switch how it communicates?įor SPI communications (4-wire), the pins are wired as follows:įor I2C communications, the pins are wired as follows: It's meant to be configured prior to turning the whole unit on and programming it. Note, this is not meant to be a running change. For example, if the user wants to use the accelerometer as an I2C device they set a jumper or if they want to use it as an SPI device, they don't set the jumper (or move it between three pins, so that when pin 1 and 2 are shorted it's in one mode and when pins 2 and 3 are shorted, it's in the other.)
What I'm trying to figure out is if there is a way to make that selectable by the end-user, perhaps by means of setting a jumper. It's able to work either through I2C or SPI.
I'm working on a design that incorporates an ADX元45 accelerometer.
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