MCU FIFO Is Never Empty

System Development
1

Hi,

I am working on a custom board using the LMS7002M and a Zynq SoC and I am currently having trouble programming the MCU. I am using the code pasted below which I believe matches the description here.

However the status register always returns 0x89 indicating that the FIFO is not empty. I can perform a read and the status changes to 0x81 which clears the data ready flag but the empty flag remains not asserted. Does anyone have any pointers to what I could be doing wrong?

Thanks in advance!

Code used:

// reset - toggle reset pin
XGpioPs_WritePin(&mio_emio, RESET_EMIO, 0);
XGpioPs_WritePin(&mio_emio, RESET_EMIO, 1);

// reset - set reset register
data_tx = 0x80020000;
spi_transact(data_tx, &data_rx, 4);

// write 1 to 0x0002 - SRAM write
data_tx = 0x80020002;
spi_transact(data_tx, &data_rx, 4);

// write the data to the device
for(int i=0; i<16384; i=i+32) {

	// wait until the programming buffer is empty
	data_tx = 0x00030000;

	do {
		spi_transact(data_tx, &data_rx, 4);
	}
	while(data_rx & 0x00000001);
}
2

I have just found this post:
https://discourse.myriadrf.org/t/custom-lms7002m-board-debugging/1746/6

Which points out there is an error in the MCU programming instructions linked above and 1 in bit 0 indicates that the buffer is empty. So there appears to be no problem.

It would be great if that documentation could be updated as we know there have been at least two people caught out by that typo.

3

Thanks for spotting this. @Zack, could we get the documentation updated?