Move master branch from from mios git repo

2014-01-23 00:23:15 +01:00
commit 609d9e5be9
352 changed files with 53418 additions and 0 deletions
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+/* 
+ * 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 <avr/io.h>
+#include <util/delay.h>
+#include <spi.h>
+
+#define SELECT_ADC PORTB &= ~(1<<PB4)
+#define DESELECT_ADC PORTB |= (1<<PB4)
+
+unsigned short read_adc(void)
+{
+  // select ADC wait 100 microseconds then read two bytes
+  SELECT_ADC;
+  _delay_us(100);
+  unsigned char one = send_spi(0xFF);
+  _delay_us(100);
+  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);
+}
+
+int main(void)
+{
+  DDRB |= (1<<PB4); // chip select for ADC
+  // use port D for leds
+  DDRD = 0xFF;
+  PORTD = 0x00;
+
+  // make sure ADC is unselected and setup spi
+  SELECT_ADC;
+  setup_spi(SPI_MODE_0, SPI_MSB, SPI_NO_INTERRUPT, SPI_MSTR_CLK16);
+
+  while (1) {
+    unsigned int num = read_adc();
+    PORTD = (1<< (num >> 9)); // use the top 3 bytes to turn on LED
+    _delay_ms(1);
+  }  
+}
+