X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=common%2Fadc.c;fp=common%2Fadc.c;h=7c71c3d5b4b3605e5f8a3bfeab8749cf1e7b21ba;hb=3c070b8fc92fe0506e29d0c0491038be241f7107;hp=0000000000000000000000000000000000000000;hpb=912c9026215483f1755c2291370208f43e1a7b2c;p=model-railway-devices.git

diff --git a/common/adc.c b/common/adc.c
new file mode 100644
index 0000000..7c71c3d
--- /dev/null
+++ b/common/adc.c
@@ -0,0 +1,18 @@
+#include "adc.h"
+
+#define BIT(n) (1<<(n))
+
+void adc_init()
+{
+	// TODO Adjust ADPS bits according to F_CPU
+	ADMUX = BIT(REFS0);
+	ADCSRA = BIT(ADEN) | BIT(ADIE) | BIT(ADPS2) | BIT(ADPS1) | BIT(ADPS0);
+	ADCSRB = 0;
+	DIDR0 = 0x3F;
+}
+
+void adc_read_async(uint8_t chan)
+{
+	ADMUX = (ADMUX&0xF0) | (chan&0x0F);
+	ADCSRA |= BIT(ADSC);
+}