support for new hardware: IBM Host keyboard

bootloader/Makefile

@@ -25,6 +25,7 @@ CC = avr-gcc
 DEFINES = -DMODELIBMMODELM
 #DEFINES = -DMODELMAYHEM
 #DEFINES = -DMODELSUNTYPE5
+#DEFINES = -DMODELIBMHOST
 
 CFLAGS = -Wall -Os -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) $(DEFINES)
 LDFLAGS = -Wl,--section-start=.text=$(BOOTLOADER_ADDRESS)

bootloader/bootloaderconfig.h

@@ -194,6 +194,20 @@ static inline void bootLoaderInit(void) {
     SRSTROBEON; SRSTROBEOFF;
 }
 #endif
+#ifdef MODELIBMHOST
+static inline void bootLoaderInit(void) {
+    // choose matrix position for hotkey. we use KEY_D, so we set row 13
+    DDRA  = 0x00;
+    PORTA = 0xff;
+    DDRC  = (1 << DDC2);
+    PORTC = ~(1 << PINC2);
+    DDRD  &= ~((1 << PIND4) | (1 << PIND5) | (1 << PIND6) | (1 << PIND7));
+    PORTD |= ((1 << PIND4) | (1 << PIND5) | (1 << PIND6) | (1 << PIND7));
+    // and later look for column 6
+    DDRB  &= ~(1 << PB6);
+    PORTB |= (1 << PB6);
+}
+#endif
 
 /**
  * Clean up after boot loader action. In this case: switch off all LEDs.
@@ -216,6 +230,11 @@ static inline void bootLoaderExit(void) {
     PORTB |= (1 << PB4) | (1 << PB5) | (1 << PB6) | (1 << PB7);
 }
 #endif
+#ifdef MODELIBMHOST
+static inline void bootLoaderExit(void) {
+    // do nothing
+}
+#endif
 
 /**
  * Check if conditions for boot loader are met. This function is called in an
@@ -307,6 +326,18 @@ static inline uint8_t bootLoaderCondition() {
     }
 }
 #endif
+#ifdef MODELIBMHOST
+static inline uint8_t bootLoaderCondition() {
+    // look for pin 6
+    if (!(PINB & (1 << PINB6))) {
+        // boot loader active
+        return 1;
+    } else {
+        // no boot loader
+        return 0;
+    }
+}
+#endif
 
 #endif /* __ASSEMBLER__ */