avr: added brightness sensor

avr/modules/0BUILD

@@ -37,6 +37,7 @@
     valsched
     xram
     heap
+    brightness
   </subdirs>
 
 </gwbuild>

avr/modules/brightness/0BUILD

@@ -0,0 +1,12 @@
+<?xml?>
+
+<gwbuild>
+
+  <extradist>
+    main.asm
+    send.asm
+  </extradist>
+
+</gwbuild>
+
+

avr/modules/brightness/main.asm

@@ -0,0 +1,130 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+
+
+.equ BRIGHTNESS_INTERVAL          = 97
+
+.equ BRIGHTNESS_FLAGS_VALID_BIT   = 7
+
+
+; ***************************************************************************
+; data
+
+.dseg
+
+brightnessDataBegin:
+  brightnessTimer:        .byte 1
+  brightnessFlags:        .byte 1
+  brightnessLastValue:    .byte 1
+brightnessDataEnd:
+
+
+
+
+; ***************************************************************************
+; code
+
+.cseg
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Brightness_Init
+;
+; Init module.
+;
+; @return CFLAG always set
+
+Brightness_Init:
+  ; preset SRAM data area
+  ldi xh, HIGH(brightnessDataBegin)
+  ldi xl, LOW(brightnessDataBegin)
+  clr r16
+  ldi r17, (brightnessDataEnd-brightnessDataBegin)
+  rcall Utils_FillSram
+
+  ; setup pins
+  cbi BRIGHTNESS_ADC_PORT, BRIGHTNESS_ADC_PIN                ; disable internal pullup for ADC
+  cbi BRIGHTNESS_ADC_DDR, BRIGHTNESS_ADC_PIN                 ; set ADC port as input
+
+  ldi r16, BRIGHTNESS_ADC_MUX                                ; select input pin, use Vcc as reference voltage
+  out ADMUX, r16
+  ldi r16, (1 << ADLAR)
+  out ADCSRB, r16
+  ldi r16, (1 << ADEN) | (1 << ADPS1) | (1 << ADPS0)         ; enable, prescaler 8
+  out ADCSRA, r16
+  
+  ldi r16, BRIGHTNESS_INTERVAL
+  sts brightnessTimer, r16
+  
+  sec
+  ret
+
+
+
+Brightness_Fini:
+  sec
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Brightness_Every100ms @global
+;
+
+Brightness_Every100ms:
+  lds r16, brightnessTimer
+  dec r16
+  breq Brightness_Every100ms_readValue
+  sts brightnessTimer, r16
+  cpi r16, 1
+  breq Brightness_Every100ms_startMeasure
+  ret
+Brightness_Every100ms_startMeasure:
+  sbi ADCSRA, ADSC                     ; start conversion
+  ret
+Brightness_Every100ms_readValue:
+  sbic ADCSRA, ADSC
+    ret ; return if bit still set, leave brightnessTimer at "1"
+  ; conversion complete, read value
+  ldi r16, BRIGHTNESS_INTERVAL                 ; restart timer
+  sts brightnessTimer, r16
+  in r16, ADCH                                 ; read value from ADC
+  sts brightnessLastValue, r16
+  ; convert to 1/0
+  lds r17, brightnessFlags
+  sbr r17, (1<<BRIGHTNESS_FLAGS_VALID_BIT)     ; set valid bit
+  sts brightnessFlags, r17
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Brightness_GetValue @global
+;
+; @return CFLAG set if there is a value, cleared otherwise (standard api)
+; @return R16 value
+; @clobbers R16
+
+Brightness_GetValue:
+  lds r16, brightnessFlags
+  sbrs r16, BRIGHTNESS_FLAGS_VALID_BIT
+    rjmp Brightness_GetValue_retNc
+  lds r16, brightnessLastValue
+  sec
+  ret
+Brightness_GetValue_retNc:
+  clc
+  ret
+; @end
+
+
+

avr/modules/brightness/send.asm

@@ -0,0 +1,31 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+.cseg
+
+
+; ---------------------------------------------------------------------------
+; @routine Brightness_Send
+
+Brightness_Send:
+  rcall Brightness_GetValue
+  brcc Brightness_Send_end
+  mov r18, r16
+  clr r19
+  ldi r20, 1
+  clr r21
+  ldi r17, VALUE_ID_BRIGHTNESS        ; VALUE ID
+  ldi r22, AQHOME_VALUETYPE_LIGHT     ; VALUE TYPE
+  rcall Main_SendValueReport
+Brightness_Send_end:
+  ret
+; @end
+
+
+