We have got a “Bad Memory, contact GHI” message on start up of a G120 Module…
But the bug is now found:
- The G120 EEPROM is attacked to SPI2… which is on PIN19, 20 and 21.
- We attached a ADC LTC1864 to the SPI2.
- The LTC1864 has no chip select - and it pulls MOSI pin 21 down.
- On start up of the G120 the SPI communication to the on board EEPROM is therefore blocked.
So,… bad memory!
SPI chips with out chip select should therefore use SPI1 instead.