rpi4-osdev/part15-tcpip/include/spi.h

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void spi_init();
void spi_send_recv(unsigned char *sbuffer, unsigned char *rbuffer, unsigned int size);
void spi_send(unsigned char *data, unsigned int size);
void spi_recv(unsigned char *data, unsigned int size);
void spi_send_no_selection(unsigned char command);
void spi_chip_select(unsigned char chip_select);