Move master branch from from mios git repo

AVR/lib/spi/Arduino/SPI/spi.c

@@ -0,0 +1,74 @@
+/* 
+ * Copyright (c) 2009 Andrew Smallbone <andrew@rocketnumbernine.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <spi.h>
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#ifdef __ARDUINO__
+#include <wiring.h>
+#endif
+
+void setup_spi(uint8_t mode, int dord, int interrupt, uint8_t clock)
+{
+  // specify pin directions for SPI pins on port B
+  if (clock == SPI_SLAVE) { // if slave SS and SCK is input
+    DDRB &= ~(1<<SPI_MOSI_PIN); // input
+    DDRB |= (1<<SPI_MISO_PIN); // output
+    DDRB &= ~(1<<SPI_SS_PIN); // input
+    DDRB &= ~(1<<SPI_SCK_PIN);// input
+  } else {
+    DDRB |= (1<<SPI_MOSI_PIN); // output
+    DDRB &= ~(1<<SPI_MISO_PIN); // input
+    DDRB |= (1<<SPI_SCK_PIN);// output
+    DDRB |= (1<<SPI_SS_PIN);// output
+  }
+  SPCR = ((interrupt ? 1 : 0)<<SPIE) // interrupt enabled
+    | (1<<SPE) // enable SPI
+    | (dord<<DORD) // LSB or MSB
+    | (((clock != SPI_SLAVE) ? 1 : 0) <<MSTR) // Slave or Master
+    | (((mode & 0x02) == 2) << CPOL) // clock timing mode CPOL
+    | (((mode & 0x01)) << CPHA) // clock timing mode CPHA
+    | (((clock & 0x02) == 2) << SPR1) // cpu clock divisor SPR1
+    | ((clock & 0x01) << SPR0); // cpu clock divisor SPR0
+  SPSR = (((clock & 0x04) == 4) << SPI2X); // clock divisor SPI2X
+}
+
+void disable_spi()
+{
+  SPCR = 0;
+}
+
+uint8_t send_spi(uint8_t out)
+{
+  SPDR = out;
+  while (!(SPSR & (1<<SPIF)));
+  return SPDR;
+}
+
+uint8_t received_from_spi(uint8_t data)
+{
+  SPDR = data;
+  return SPDR;
+}