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Altera_Forum
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11 years ago

Having trouble with the alt_spi_is_ready() function

Hi, I've been trying to control a simple SPI LED driver IC using the SPIM0 unit in my cyclone V HPS. The problem is that the alt_spi_is_ready() function doesn't do what I expect it to do. ...
Altera_Forum's avatar
Altera_Forum
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11 years ago

Hi Alrdridge,

I looked at the MAX6966AE data sheet and it expects Mode 0. The issue is that the slave select signal is toggled between frames when SCPH=0 (see figure 19-7 in the CV data book). This behavior can cause a problem with some peripherals. Try mode 3 with your device.

Regards,

Sue