Michael (XIAO Xufeng) 86bcd56109 spi: fix the bug of connecting SPI peripheral to read-only pins
The requirements of pin capabilites is different for spi master and
slave.  The master needs CS, SCLK, MOSI to be output-able, while slave
needs MISO to be output-able.

Previous code is for master only.

This commit allows to place other 3 pins than MISO on input-only pins
for slaves. Refactoring for spi_common is also included.

Resolves https://github.com/espressif/esp-idf/issues/2455
2019-02-16 20:03:14 +08:00
..
2018-07-24 10:33:58 +08:00