drivers/spi/spi.c
1 2 3 4 5 6 7 8 9 | spi_write_then_read __spi_sync spi_transfer_one_message spi_set_cs stm32_spi_transfer_one rspi_dma_transfer rspi_pio_transfer |
SPI: Serial Peripheral Interface
CS(SS): Chip Select
SCLK: Serial Clock
PTP: Precise Time Protocol
refer to:
https://blog.csdn.net/faihung/article/details/81839825