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authordufourj2006-05-23 17:22:34 +0000
committerdufourj2006-05-23 17:22:34 +0000
commit4e8836e7ae1b5e69d90a7887ad924dd31269da29 (patch)
tree0816e65ef72a70ba25966af28082760946b74435 /n/avr/modules
parent4d1bbfbad04a9af0436fc1709ac301f19fea9260 (diff)
ADC :
- import de l'ADC de l'année dernière.
Diffstat (limited to 'n/avr/modules')
-rw-r--r--n/avr/modules/adc/adc.c67
-rw-r--r--n/avr/modules/adc/adc.h51
2 files changed, 118 insertions, 0 deletions
diff --git a/n/avr/modules/adc/adc.c b/n/avr/modules/adc/adc.c
new file mode 100644
index 0000000..8bb3daf
--- /dev/null
+++ b/n/avr/modules/adc/adc.c
@@ -0,0 +1,67 @@
+/* adc.c */
+/* n.avr.adc - AVR ADC Module. {{{
+ *
+ * Copyright (C) 2005 Thomas Burg
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Contact :
+ * Email: <burg@efrei.fr>
+ * }}} */
+#include "adc.h"
+
+#include "io.h"
+#include "modules/utils/utils.h"
+
+/* Tested AVR check. */
+#if defined (__AVR_ATmega8__)
+#elif defined (__AVR_ATmega8535__)
+#elif defined (__AVR_ATmega128__)
+#elif defined (__AVR_ATmega64__)
+#else
+# warning "adc: not tested on this chip."
+#endif
+
+/* ADC configuration. */
+/* REFS = 01: AVCC with external capacitor at AREF pin.
+ * 11: Internal 2.56V Voltage Reference with external capacitor
+ * at AREF pin. */
+#define ADMUX_CFG (regv (REFS1, REFS0, ADLAR, MUX4, MUX3, MUX2, MUX1, MUX0, \
+ 1, 1, 0, 0, 0, 0, 0, 0))
+#define ADCSR_CFG (regv (ADEN, ADSC, ADATE, ADIF, ADIE, ADPS2, ADPS1, ADPS0, \
+ 1, 0, 0, 1, 0, 0, 0, 0))
+#define ADCSR_CFG_115200 7
+
+/* +AutoDec */
+/* -AutoDec */
+
+/** Initialise adc. */
+void
+adc_init (void)
+{
+ /* Low freq. */
+ ADCSR = ADCSR_CFG | ADCSR_CFG_115200;
+}
+
+/** Choose and start mesure on adc line. */
+void
+adc_start (uint8_t c)
+{
+ /* Choose adc. */
+ ADMUX = ADMUX_CFG | (c & 0x07);
+ /* Start mesure. */
+ ADCSR |= _BV (ADSC);
+}
+
diff --git a/n/avr/modules/adc/adc.h b/n/avr/modules/adc/adc.h
new file mode 100644
index 0000000..3026bb7
--- /dev/null
+++ b/n/avr/modules/adc/adc.h
@@ -0,0 +1,51 @@
+#ifndef adc_h
+#define adc_h
+/* adc.h */
+/* n.avr.adc - AVR ADC Module. {{{
+ *
+ * Copyright (C) 2005 Thomas Burg
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Contact :
+ * Email: <burg@efrei.fr>
+ * }}} */
+
+#include "common.h"
+/* Different name on ATmega8535. */
+
+#if defined (__AVR_ATmega8535__)
+#define ADCSR ADCSRA
+#endif
+
+/* +AutoDec */
+
+/** Initialise adc. */
+void
+adc_init (void);
+
+/** Choose and start mesure on adc line. */
+void
+adc_start (uint8_t c);
+
+/* -AutoDec */
+
+/** check on finish mesure */
+#define adc_checkf() bit_is_set (ADCSR, ADIF)
+
+/** read mesure */
+#define adc_read() ADCW
+
+#endif /* adc_h */