Hi,
I have problem with SPI data transfer. Spi is used with external ads1271.
ADC data ready voltage level seems OK ~1,8 V (Vdd) but the MISO line shows only about half of this ~0,9 V. This seems to be too low for data transfer. MISO line is direct line to CPU.
CPU provides master clock at 27MHz and SPIclk is 27 MHz from same source. MOSI is not in use.
Are there any ideas that could explain this behaviour?