X-Git-Url: http://git.kpe.io/?p=avr_bc100.git;a=blobdiff_plain;f=BaseMegaFirmware%2FGCC%2Fspi.c;fp=BaseMegaFirmware%2FGCC%2Fspi.c;h=a69e4e7f182c6ecdebf45e6553414827e283bd2e;hp=0000000000000000000000000000000000000000;hb=89173ec9cd6f33843bf27c45be0f2f9be3f5f0ce;hpb=7997f136b12114035265bd082c854bff95fd73dc

diff --git a/BaseMegaFirmware/GCC/spi.c b/BaseMegaFirmware/GCC/spi.c
new file mode 100644
index 0000000..a69e4e7
--- /dev/null
+++ b/BaseMegaFirmware/GCC/spi.c
@@ -0,0 +1,43 @@
+// Martin Thomas 3/2008
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+#include "spi.h"
+
+void SPI_init( void )
+{
+	SPI_PORT |= (1<<SPI_MISO_BIT) | ( 1<<SPI_SS_BIT); // enable pull-up input and SS default high
+	SPI_PORT &= ~( (1<<SPI_SCK_BIT) | (1<<SPI_MOSI_BIT) ); // output-inits
+	SPI_DDR  &= ~(1<<SPI_MISO_BIT);
+	SPI_DDR  |= (1<<SPI_MOSI_BIT) | (1<<SPI_SCK_BIT) | (1<<SPI_SS_BIT);		//Set MOSI, SCK AND SS as outputs
+	// SPSR = (1<<SPI2X);
+	SPCR = (1<<SPE) | (1<<MSTR) | ( 1<<SPR1) | ( 1<<SPR0 );
+}
+
+void SPI_release( void )
+{
+	SPCR = 0;
+	SPI_DDR  &= ~( (1<<SPI_MOSI_BIT) | (1<<SPI_SCK_BIT) | (1<<SPI_SS_BIT ) );
+	SPI_PORT &= ~( (1<<SPI_MISO_BIT) | ( 1<<SPI_SS_BIT) );
+}
+
+uint8_t SPI_rw( uint8_t out )
+{
+	uint8_t in;
+
+	_delay_ms(1); // slow down to give slave time to process
+
+#if defined(SPDR0)
+	SPDR0 = out;
+	while( !(SPSR0 & (1<<SPIF0)) ) { ; }
+	in = SPDR0;
+#else
+	SPDR = out;
+	while( !(SPSR & (1<<SPIF)) ) { ; }
+	in = SPDR;
+#endif
+	return in;
+}
+