nodemcu-firmware/app/include/driver/spi.h

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#ifndef SPI_APP_H
#define SPI_APP_H
#include "spi_register.h"
#include "ets_sys.h"
#include "osapi.h"
#include "uart.h"
#include "os_type.h"
/*SPI number define*/
#define SPI 0
#define HSPI 1
//lcd drive function
void spi_lcd_mode_init(uint8 spi_no);
void spi_lcd_9bit_write(uint8 spi_no,uint8 high_bit,uint8 low_8bit);
//spi master init funtion
void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock_div);
//use spi send 8bit data
void spi_mast_byte_write(uint8 spi_no,uint8 *data);
//transmit data to esp8266 slave buffer,which needs 16bit transmission ,
//first byte is master command 0x04, second byte is master data
void spi_byte_write_espslave(uint8 spi_no,uint8 data);
//read data from esp8266 slave buffer,which needs 16bit transmission ,
//first byte is master command 0x06, second byte is to read slave data
void spi_byte_read_espslave(uint8 spi_no,uint8 *data);
//esp8266 slave mode initial
void spi_slave_init(uint8 spi_no);
//esp8266 slave isr handle funtion,tiggered when any transmission is finished.
//the function is registered in spi_slave_init.
void spi_slave_isr_handler(void *para);
//hspi test function, used to test esp8266 spi slave
void hspi_master_readwrite_repeat(void);
void ICACHE_FLASH_ATTR
spi_test_init(void);
#endif