adriendesp opened a new pull request, #13292:
URL: https://github.com/apache/nuttx/pull/13292
## Summary
The input stage DX0 is used for MISO signal. The register DX0CR select the
pinmux input signal (DX0A, DX0B, ..., DX0G).
Currently only one input signal was possible for all active SPI channel due
to global BOARD_SPI_DX define.
I added the suport for individual BOARD_SPIx_DX for each SPI channel.
`/* USIC1 CH0 is used as SPI2
*
* MOSI - P0.5
* MISO - P0.4
* SCLK - P0.11
*/
#define BOARD_SPI2_DX USIC_DXA
#define GPIO_SPI2_MOSI (GPIO_U1C0_DOUT0_2 | GPIO_PADA2_STRONGMEDIUM |
GPIO_OUTPUT_CLEAR)
#define GPIO_SPI2_MISO (GPIO_U1C0_DX0A)
#define GPIO_SPI2_SCLK (GPIO_U1C0_SCLKOUT_1 | GPIO_PADA2_STRONGMEDIUM)
`
## Impact
It is retro-compatible with previous BOARD_SPI_DX define, so old code won't
break.
## Testing
Tested on custom XMC4800 board.
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