SPI (Basics): Why do I get a signal at MISO (PB_4) when performing a write without any connection to this pin? I am using STM32F413 Discovery Board with mbed
Hi everyone, I am trying to connect my STM32F413 Discovery Board to a MAX30003 ECG but without any success. So I checked the SPI signals with a scope and discovered that I measure a signal on the MISO line as soon as I use a write command. All pins (...