powerstep01

[Lin SS]

Posted on May 07, 2017 at 12:50

An arm cortex-M0 MCU is adopted to drive the powetstep01.

The initialization of SPI is done including CS, SDO, SDI, CK,BUSY, STBY.

Here is the problem, I want the step motor run, so I write this:

CS=low;//chip select

SPI1_TX0 = param;//param=0xFF50, since the address of the run command is 0101000DIR, and FF represents speed

SPI1_CNTRL |= GO_BUSY;//start the transmit

delay;

CS=high;

The powerstep01 did not work. Is this the right way?

Or what else should be done  before sending commands(SPI has been initialized already)?

Thank you very much!

[Enrico Poli]

Posted on May 12, 2017 at 09:47

Hi,

The speed parameter that should be passed after the Run command is 3 bytes long, so I think you need to send two more bytes to the device in order to make the device execute the command.

Other possible issues:

1. The CS line must be raised at the end of each by transmission. The SPI of the device accept one byte at a time.
2. You are putting two bytes in your SPI interface. In which order are they transmitted (LSB first or MSB first)?