Added more objects to BDK port, and connected AI to ADC7, and BI0..BI4 to PINB0..PINB4. Fixed up some other objects and object API (header files).

2009-06-18 03:58:54 +00:00
parent 6e6cdf2bc0
commit e70dd3c7ba
18 changed files with 814 additions and 29 deletions
@@ -0,0 +1,94 @@
+/**************************************************************************
+*
+* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
+*
+* 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 <stdbool.h>
+#include <stdint.h>
+#include "hardware.h"
+
+/* prescale select bits */
+#if   (F_CPU >> 1) < 1000000
+  #define ADPS_8BIT    (1)
+  #define ADPS_10BIT   (3)
+#elif (F_CPU >> 2) < 1000000
+  #define ADPS_8BIT    (2)
+  #define ADPS_10BIT   (4)
+#elif (F_CPU >> 3) < 1000000
+  #define ADPS_8BIT    (3)
+  #define ADPS_10BIT   (5)
+#elif (F_CPU >> 4) < 1000000
+  #define ADPS_8BIT    (4)
+  #define ADPS_10BIT   (6)
+#elif (F_CPU >> 5) < 1000000
+  #define ADPS_8BIT    (5)
+  #define ADPS_10BIT   (7)
+#else
+  #error  "ADC: F_CPU too large for accuracy."
+#endif
+
+/* we could have array of ADC results */
+static volatile uint8_t Sample_Result;
+
+ISR(ADC_vect)
+{
+    /* since we configured as ADLAR=1, get value from ADCH */
+    Sample_Result = ADCH;
+}
+
+uint8_t adc_result(
+    uint8_t channel) /* 0..7 = ADC0..ADC7, respectively */
+{
+    return Sample_Result;
+}
+
+void adc_init(void)
+{
+    /*  set prescaler */
+    ADCSRA |= ADPS_8BIT;
+    /* Initial channel selection */
+    /* ADLAR = Left Adjust Result
+       REFSx = hardware setup: cap on AREF
+    */
+    ADMUX = 7 /* channel */ | (1 << ADLAR) | (0 << REFS1) | (1 << REFS0); 
+    /*  ADEN = Enable
+        ADSC = Start conversion
+        ADIF = Interrupt Flag
+        ADIE = Interrupt Enable    
+        ADATE = Auto Trigger Enable    
+    */
+    ADCSRA |= (1 << ADEN) | (1 << ADIE) | (1 << ADIF) | (1 << ADATE);
+    /* trigger selection bits
+    0 0 0 Free Running mode
+    0 0 1 Analog Comparator
+    0 1 0 External Interrupt Request 0
+    0 1 1 Timer/Counter0 Compare Match
+    1 0 0 Timer/Counter0 Overflow
+    1 0 1 Timer/Counter1 Compare Match B
+    1 1 0 Timer/Counter1 Overflow
+    1 1 1 Timer/Counter1 Capture Event        
+    */
+    ADCSRB |= (0 << ADTS2) | (0 << ADTS1) | (0 << ADTS0);
+    /* start the conversions */
+    ADCSRA |= (1 << ADSC);
+    /* Clear the Power Reduction bit */
+    BIT_CLEAR(PRR, PRADC);
+}