I can successfully send data from the pynq to the slave device (MSP430) but I am not sure how to receive data from the MSP430.
What parameter should I put in the second spot of the receive function? It seems like it’s asking me to predict the data that should be coming to it.
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I’m not sure what the data parameter should be there. I know it’s supposed to be a cdata pointer but is that a register on the pynq?
The PYNQ doc is not really specific on the parameter other than that it is is bytes-like. Should it be a buffer, register, RX_FIFO ?
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Figured it out! The data parameter in the receive() function should be a bytes object produced by bytes(size) function.
Example:
test = bytes(1)
should return an bytes object of size 1 byte
type(test)
should return “bytes”
So if I expect to receive a char from a slave device with address 0x30, I would type
test_IIC = lib.AxiIIC(ol.ip_dict["axi_iic_0"])
and test_IIC.receive(0x30,test,1,0)
will output 1.
This site helped me understand as well Python bytes() .