The cyhal_spi_send api was changed to read and discard a byte on every
send operation (at the protocol level all SPI transfers are bidirectional).
This means that to achieve a truly bidirectional transfer, the
cyhal_spi_transfer API must be called (as opposed to a write followed
by a read).
- Fix assert when spi_master_block_write called with 0 size
- Fix assert when spi_format called before spi_frequency
- Simplify implementation of spi_master_write
- Simplify pointer arithmetic expressions in cyhal_spi_transfer and
cyhal_spi_transfer_async
- Fix I2C driver not honoring the frequency specified during init.
Shuopeng Deng
Kyle Kearney
Volodymyr Medvid