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PortIn in NUCLEO?
How to map PortIn method pins on NUCLEO 411re?
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Last updated: 20 Apr 2021
Affordable and flexible platform to ease prototyping using a STM32F411RET6 microcontroller.
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Answer found: referring to a pinout with hardware port names is enough for building a bitmask. I will use an 8-bit port for the OV7670 parallel camera; I'll take pins on Port C to grab the incoming byte: MSB LSB D7,D6,D5,D4,D3,D2,D1,D0 -> PC12,PC13,PC14,PC15,PC2,PC3,PC1,PC0 (This is an arbitrary assignment of the pins! I referred to https://jpralves.net/img/mcb/nucleo_pinout_13.png) Basically the Pin number is coded in the POSITION of a "1" in the bitmask applied to the port: if I want to read just one pin of the port, say PC0, I'll write: data(Port C,0x1); If I want PC0, PC2 and PC13 it' ll become data(Port C,0x0x2005); And the pin values will be stored in "data". Obviously I will have to shift the bits around to make the whole byte.
posted by angelo mottolese 04 Oct 2017