new files (SPI)

src/fpga_spi.c

@@ -0,0 +1,52 @@
+// insert cool lengthy disclaimer here
+/*
+	fpga_spi.c: SPI functions for SRAM interfacing and mapper config
+
+	SPI commands
+
+	cmd		param		function	
+   =============================================
+	00		bb[hh[ll]]	set address to 0xbbhhll
+	2s		-			set SRAM size to s
+	3m		-			set mapper to m
+						0=HiROM, 1=LoROM
+	80		-			read with increment
+	81		-			read w/o increment
+	90		{xx}*		write xx with increment
+	91		{xx}*		write xx w/o increment
+	
+*/
+
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "avrcompat.h"
+#include "fpga.h"
+#include "config.h"
+#include "uart.h"
+#include "spi.h"
+#include "fpga_spi.h"
+
+void spi_fpga(void) {
+	SPI_SS_HIGH();
+	FPGA_SS_LOW();
+}
+
+void spi_sd(void) {
+	FPGA_SS_HIGH();
+	SPI_SS_LOW();
+}
+
+void fpga_spi_init(void) {
+	DDRC = _BV(PC7);
+	FPGA_SS_HIGH();
+}
+
+void set_avr_addr(uint32_t address) {
+	spi_fpga();
+	spiTransferByte(0x00);
+	spiTransferByte((address>>16)&0xff);
+	spiTransferByte((address>>8)&0xff);
+	spiTransferByte((address)&0xff);
+	spi_sd();
+}
+

src/fpga_spi.h

@@ -0,0 +1,10 @@
+// insert cool lengthy disclaimer here
+
+#define FPGA_SS_HIGH()	do {PORTC |= _BV(PC7);} while (0)
+#define FPGA_SS_LOW()	do {PORTC &= ~_BV(PC7);} while (0)
+
+void fpga_spi_init(void);
+void fpga_spi_test(void);
+void spi_fpga(void);
+void spi_sd(void);
+void set_avr_addr(uint32_t);