X-Git-Url: http://git.kpe.io/?p=avr_bc100.git;a=blobdiff_plain;f=BaseMegaFirmware%2FGCC%2Fkey_io.h;fp=BaseMegaFirmware%2FGCC%2Fkey_io.h;h=8c0891f6c70eeba0026a865ff85ae350b74ec576;hp=0000000000000000000000000000000000000000;hb=89173ec9cd6f33843bf27c45be0f2f9be3f5f0ce;hpb=7997f136b12114035265bd082c854bff95fd73dc

diff --git a/BaseMegaFirmware/GCC/key_io.h b/BaseMegaFirmware/GCC/key_io.h
new file mode 100644
index 0000000..8c0891f
--- /dev/null
+++ b/BaseMegaFirmware/GCC/key_io.h
@@ -0,0 +1,101 @@
+/* Copyright (c)2007, 2008 Martin Thomas, BSD license */
+
+#ifndef KEY_IO_H_
+#define KEY_IO_H_
+
+#include <stdint.h>
+#include <avr/io.h>
+
+#include "timebase.h" /* for TIMEBASE_DELTAT_MS */
+
+#define KEY_IO_KEYSA_DDR     DDRC
+#define KEY_IO_KEYSA_PORT    PORTC
+#define KEY_IO_KEYSA_PIN     PINC
+#define KEY_IO_KEYA1_BIT     PC0 /* SW0 */
+#define KEY_IO_KEYA2_BIT     PC1 /* SW1 */
+#define KEY_IO_KEYA3_BIT     PC6 /* SW2 */
+#define KEY_IO_KEYA4_BIT     PC7 /* SW3 */
+#define KEY_IO_KEYSB_DDR     DDRD
+#define KEY_IO_KEYSB_PORT    PORTD
+#define KEY_IO_KEYSB_PIN     PIND
+#define KEY_IO_KEYB1_BIT     PD5 /* Power button */
+
+#define KEY_IO_KEY_SW0      (1<<0)
+#define KEY_IO_KEY_SW1      (1<<1)
+#define KEY_IO_KEY_SW2      (1<<2)
+#define KEY_IO_KEY_SW3      (1<<3)
+#define KEY_IO_KEY_POWER    (1<<4)
+#define KEY_IO_KEY_ALL \
+	( KEY_IO_KEY_SW0    | \
+	  KEY_IO_KEY_SW1    | \
+	  KEY_IO_KEY_SW2    | \
+	  KEY_IO_KEY_SW3    | \
+	  KEY_IO_KEY_POWER )
+
+
+static inline uint8_t key_io_state_hardware(void)
+{
+	uint8_t tmp1, tmp2, tmp3;
+	tmp1 = KEY_IO_KEYSA_PIN & (	(1<<KEY_IO_KEYA1_BIT) | (1<<KEY_IO_KEYA2_BIT) );
+	tmp2 = KEY_IO_KEYSA_PIN & (	(1<<KEY_IO_KEYA3_BIT) | (1<<KEY_IO_KEYA4_BIT) );
+	tmp2 >>= 4;
+	tmp3 = KEY_IO_KEYSB_PIN & (1<<KEY_IO_KEYB1_BIT);
+	tmp3 >>= 1;
+	return ( tmp1 | tmp2 | tmp3 );
+}
+
+/* debounce/repeat code based on an example from Peter Dannegger,
+   modified for better integration and volatiles added */
+
+//#define KEY_IO_REPEAT_MASK   ( KEY_IO_KEY_DOWN | KEY_IO_KEY_UP )
+#define KEY_IO_REPEAT_MASK   ( KEY_IO_KEY_ALL )
+#define KEY_IO_REPEAT_START  ( 500/*ms*/ / TIMEBASE_DELTAT_MS )
+#define KEY_IO_REPEAT_NEXT   ( 100/*ms*/ / TIMEBASE_DELTAT_MS )
+
+// debounced and inverted key state, bit = 1: key pressed
+extern volatile uint8_t key_io_state;		
+// key press detect
+extern volatile uint8_t key_io_press;
+// key long press and repeat
+extern volatile uint8_t key_io_rpt;
+
+/* The following callback-function has to be 
+   called frequently from timer-ISR. Implemented 
+   in this header-file as static inline to 
+   indicate to the compiler that the function 
+   should be inlined into the ISR-code. Tested with 
+   avr-gcc 4.2.1: inlined - o.k. */
+static inline void key_io_callback(void)
+{
+	static uint8_t ct0, ct1, rpt;
+	uint8_t i, mystate;
+
+	mystate = key_io_state;
+
+	i = mystate ^ ~( key_io_state_hardware() );	// keys changed ?
+	ct0 = ~(ct0 & i);			// reset or count ct0
+	ct1 = ct0 ^ (ct1 & i);		// reset or count ct1
+	i &= ct0 & ct1;				// count until roll over ?
+	mystate ^= i;	// then toggle debounced state
+	key_io_press |= mystate & i;	// 0->1: key press detect
+
+	if( (mystate & KEY_IO_REPEAT_MASK) == 0 ) {	// check repeat function
+		rpt = KEY_IO_REPEAT_START;				// start delay
+	}
+	if( --rpt == 0 ) {
+		rpt = KEY_IO_REPEAT_NEXT;	// repeat delay
+		key_io_rpt |= mystate & KEY_IO_REPEAT_MASK;
+	}
+
+	key_io_state = mystate;
+}
+
+void key_io_init(void);
+
+uint8_t key_io_get_press( uint8_t key_mask );
+uint8_t key_io_get_rpt( uint8_t key_mask );
+uint8_t key_io_get_longpress( uint8_t key_mask );
+/* only returns "true" after key has been released: */
+uint8_t key_io_get_was_short( uint8_t key_mask );
+
+#endif