Move master branch from from mios git repo

AVR/lib/spi/Arduino/SPI/examples/MCP3201_ADC/MCP3201_ADC.pde

@@ -0,0 +1,32 @@
+#include <spi.h>
+
+#define SELECT_ADC digitalWrite(8, LOW);
+#define DESELECT_ADC  digitalWrite(8, HIGH);
+
+unsigned short read_adc(void)
+{
+  // select ADC wait 100microseconds then read two bytes
+  SELECT_ADC;
+  unsigned char one = send_spi(0xFF);
+  unsigned char two = send_spi(0xFF);
+  DESELECT_ADC;
+  // 12 bits of ADC value is bottom 5 bits of first
+  // byte and top 7 bits of second, move into 16 bit int
+  return ((0x1F & one) << 7) | (two >> 1);
+}
+
+void setup()
+{
+  pinMode(8, OUTPUT);
+  Serial.begin(19200);
+  // make sure ADC is not selected and setup spi
+  DESELECT_ADC;
+  setup_spi(SPI_MODE_0, SPI_MSB, SPI_NO_INTERRUPT, SPI_MSTR_CLK16);
+}
+
+void loop()
+{
+  unsigned short num = read_adc();
+  Serial.println(num);
+  delay(1000);
+}