SPI_SWAP_DATA_TX macro

Transform unsigned integer of length <= 32 bits to the format which can be sent by the SPI driver directly. E.g. to send 9 bits of data, you can: uint16_t data = SPI_SWAP_DATA_TX(0x145, 9); Then points tx_buffer to ``&data``.

Syntax

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Declaration

from spi_common.h:39

#define SPI_SWAP_DATA_TX(DATA, LEN) __builtin_bswap32((uint32_t)(DATA)<<(32-(LEN)))

Arguments

Argument

Description

DATA

Data to be sent, can be uint8_t, uint16_t or uint32_t.

LEN

Length of data to be sent, since the SPI peripheral sends from the MSB, this helps to shift the data to the MSB.

Examples

References

from examples

SPI_SWAP_DATA_TX macro

Syntax

Arguments

Examples

References

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