fix(PR): Moved SPI helper functions from extralib to own project (!827)

Author: UserR00T

examples/spi_slave/spi_slave.c

@@ -1,13 +1,6 @@
 #include "ch32fun.h"
 #include <stdio.h>
 
-#define CH32V003_SPI_SPEED_HZ 1000000
-#define CH32V003_SPI_DIRECTION_2LINE_TXRX
-#define CH32V003_SPI_CLK_MODE_POL0_PHA0
-#define CH32V003_SPI_NSS_SOFTWARE_ANY_MANUAL
-
-#include "../../extralibs/ch32v003_SPI.h"
-
 #define PIN_CS PC1
 // Useful to determine the cycle duration with a scope. Goes high the moment CS goes low, and back to low at the last
 // action within the while loop. Can be removed otherwise.
@@ -36,6 +29,16 @@ void wait_for_state( SpiState desired_state )
 	}
 }
 
+static uint8_t SPI_read_8()
+{
+	return SPI1->DATAR;
+}
+
+static void SPI_write_8( uint8_t data )
+{
+	SPI1->DATAR = data;
+}
+
 void SPI_Configure()
 {
 	// reset control register