Kconfig

choice
	prompt "AVR MCU selection"
	default MCU_T85
	config MCU_T25
		bool "ATtiny25"
	config MCU_T45
		bool "ATtiny45"
	config MCU_T85
		bool "ATtiny85"
endchoice

config F_CPU
	int "MCU clock frequency (Hz)"
	default 16000000

comment "Feature selection"

config FEAT_ANALOG
	bool "Use Analog PCB"
	default y

config FEAT_AUXDET
	bool "Enable AUX input signal detection"
	depends on FEAT_ANALOG
	default y

config FEAT_HS_BTN
	bool "Enable headset button emulation"
	depends on FEAT_ANALOG
	select FEAT_AUXDET
	default y

config FEAT_BT
	bool "Enable Bluetooth module support"
	depends on FEAT_ANALOG
	default y

config FEAT_BT_RADIO_CONTROLS
	bool "Support changing tracks on Bluetooth with radio panel"
	depends on FEAT_BT
	default y

config FEAT_AUX_RADIO_CONTROLS
	bool "Support changing tracks on AUX with radio panel"
	depends on FEAT_ANALOG && FEAT_HS_BTN
	default y

comment "Protocol settings"

menu "UART config"
	config DEBUG
		bool "Enable debugging output"
		default y
		help
			Enable printing various debugging messages to the UART port.
			Will increase flash memory footprint and may confuse the Bluetooth module.

	config UART_RXBUF_SIZE
		int "RX buffer size"
		default 16
		help
			RX buffer size to use for UART messages (bytes).

	config UART_TXBUF_SIZE
		int "TX buffer size"
		default 16
		help
			TX buffer size to use for UART messages (bytes).

	comment "Single-wire UART config"

	choice
		prompt "Port number"
		default SWU_PORTB
		help
			MCU port number for communication.
		config SWU_PORTA
			bool "Port A"
		config SWU_PORTB
			bool "Port B"
		config SWU_PORTC
			bool "Port C"
		config SWU_PORTD
			bool "Port D"
	endchoice

	config SWU_PIN
		int "Pin number"
		range 0 7
		default 4
		help
			Pin number within the port.

	config SWU_WAIT_ONE
		int "WAIT_ONE value"
		range 0 255
		default 26
		help
			Half bit period compare setting. See the [AVR274] application note for calculation of this value. Make sure timer prescaler is set to the intended value.

	choice
		prompt "Prescaler value"
		default SWU_PRESCALER_64
		help
			Prescaler setting. Must be set according to the baud rate setting.
		config SWU_PRESCALER_1
			bool "1"
		config SWU_PRESCALER_8
			bool "8"
		config SWU_PRESCALER_64
			bool "64"
	endchoice

	# choice
	# 	prompt "Prescaler control register"
	# 	default SWU_TCCR0B
	# 	help
	# 		Define the timer control register according to the timer used for the UART.
	# 	config SWU_TCCR0B
	# 		bool "TCCR0B"
	# endchoice

	# choice
	# 	prompt "Timer compare vector"
	# 	default SWU_TIMER0_COMPA
	# 	help
	# 		UART compare interrupt vector.
	# 	config SWU_TIMER0_COMPA
	# 		bool "TIMER0_COMPA_vect"
	# endchoice

	# choice
	# 	prompt "External interrupt vector"
	# 	default SWU_PCINT0
	# 	help
	# 		UART external interrupt vector. Make sure this is in accordance to the defined UART pin.
	# 	config SWU_PCINT0
	# 		bool "PCINT0_vect"
	# endchoice
endmenu

menu "I2C config"
	comment "SDA pin"

	choice
		prompt "I2C SDA port number"
		default I2C_SDA_PORTB
		help
			Port number for I2C SDA line.
		config I2C_SDA_PORTA
			bool "Port A"
		config I2C_SDA_PORTB
			bool "Port B"
		config I2C_SDA_PORTC
			bool "Port C"
		config I2C_SDA_PORTD
			bool "Port D"
	endchoice

	config I2C_SDA_PIN
		int "I2C SDA pin number"
		range 0 7
		default 1
		help
			Pin number within the port.

	comment "SCL pin"

	choice
		prompt "I2C SCL port number"
		default I2C_SCL_PORTB
		help
			Port number for I2C SCL line.
		config I2C_SCL_PORTA
			bool "Port A"
		config I2C_SCL_PORTB
			bool "Port B"
		config I2C_SCL_PORTC
			bool "Port C"
		config I2C_SCL_PORTD
			bool "Port D"
	endchoice

	config I2C_SCL_PIN
		int "I2C SCL pin number"
		range 0 7
		default 3
		help
			Pin number within the port.
endmenu

menu "SPI config"
	comment "Options for tinySPI"

	choice
		prompt "SPI port number"
		default SPI_PORTB
		help
			Port number for all SPI lines.
		config SPI_PORTA
			bool "Port A"
		config SPI_PORTB
			bool "Port B"
		config SPI_PORTC
			bool "Port C"
		config SPI_PORTD
			bool "Port D"
	endchoice

	config SPI_SCK_PIN
		int "SCK pin number"
		range 0 7
		default 2
		help
			Pin number within the port.

	config SPI_DO_PIN
		int "DO/MOSI pin number"
		range 0 7
		default 1
		help
			Pin number within the port.

	config SPI_DI_PIN
		int "DI/MISO pin number"
		range 0 7
		default 0
		help
			Pin number within the port.
endmenu

menu "CAN config"
	choice
		prompt "Bus speed"
		default MCP_125K
		config MCP_5K
			bool "5 kbps"
			depends on !MCP_20M
		config MCP_10K
			bool "10 kbps"
			depends on !MCP_20M
		config MCP_20K
			bool "20 kbps"
			depends on !MCP_20M
		config MCP_31K25
			bool "31.25 kbps"
			depends on MCP_8M
		config MCP_33K
			bool "33 kbps"
		config MCP_40K
			bool "40 kbps"
		config MCP_50K
			bool "50 kbps"
		config MCP_80K
			bool "80 kbps"
		config MCP_83K3
			bool "83.3 kbps"
			depends on !MCP_8M
		config MCP_100K
			bool "100 kbps"
		config MCP_125K
			bool "125 kbps"
		config MCP_200K
			bool "200 kbps"
		config MCP_250K
			bool "250 kbps"
		config MCP_500K
			bool "500 kbps"
		config MCP_1000K
			bool "1000 kbps"
	endchoice

	choice
		prompt "MCP2515 clock frequency"
		default MCP_8M
		config MCP_8M
			bool "8 MHz"
		config MCP_16M
			bool "16 MHz"
		config MCP_20M
			bool "20 MHz"
	endchoice

	choice
		prompt "MCP2515 CS port number"
		default MCP_CS_PORTB
		help
			Port number for MCP2515 chip select.
		config MCP_CS_PORTA
			bool "Port A"
		config MCP_CS_PORTB
			bool "Port B"
		config MCP_CS_PORTC
			bool "Port C"
		config MCP_CS_PORTD
			bool "Port D"
	endchoice

	config MCP_CS_PIN
		int "MCP2515 CS pin number"
		range 0 7
		default 3
		help
			Pin number within the port.
endmenu

comment "Feature settings"

menu "GPIO config"
	comment "PCF8574 options"

	config PCF_SCAN
		bool "Auto scan for PCF8574 on I2C bus"
		help
			Auto scan the I2C bus to detect whether the I/O expander is a PCF8574 or a PCF8574A.
			Will increase flash memory footprint.

	config PCF_ADDR
		hex "PCF8574 address on I2C bus"
		depends on !PCF_SCAN
		default 0x22

	comment "Pin assignments"

	config PIN_LED_RED
		int "Red LED pin"
		default 6
		help
			LED for signalling ignition and radio status.

	config PIN_LED_GREEN
		int "Green LED pin"
		default 5
		help
			LED for signalling audio signal playback status.

	config PIN_LED_BLUE
		int "Blue LED pin"
		default 4
		help
			LED for signalling Bluetooth connection/playback status.

	config PIN_ANALOG_PWR
		int "Analog PCB power pin"
		depends on FEAT_ANALOG
		default 0

	config PIN_AUXDET
		int "Audio signal detection pin"
		depends on FEAT_AUXDET
		default 1

	config PIN_BTN1
		int "Headset button 1 pin"
		depends on FEAT_HS_BTN
		default 3

	config PIN_BTN2
		int "Headset button 2 pin"
		depends on FEAT_HS_BTN
		default 7
endmenu

menu "Bluetooth module AT commands"
	depends on FEAT_BT

	comment "AT commands"

	config BT_AT_PAIR_ON
		string "Enter pairing mode"
		default "AT+CA"
	config BT_AT_PAIR_OFF
		string "Exit pairing mode"
		default "AT+CB"
	config BT_AT_CONNECT
		string "Connect to last remembered device"
		default "AT+CC"
	config BT_AT_DISCONNECT
		string "Disconnect"
		default "AT+CD"
	config BT_AT_SHUTDOWN
        string "Shutdown"
        default "AT+CP"
	config BT_AT_PLAY
		string "Play/pause music playback"
		default "AT+MA"
	config BT_AT_STOP
		string "Stop music playback"
		default "AT+MC"
	config BT_AT_NEXT
		string "Play next track"
		default "AT+MD"
	config BT_AT_PREV
		string "Play previous track"
		default "AT+ME"
	config BT_AT_FF
		string "Seek forward"
		default "AT+MF"
	config BT_AT_REW
		string "Seek backward"
		default "AT+MH"
	config BT_AT_CONN_STATUS
		string "Read connection status"
		default "AT+MO"
	config BT_AT_PLAY_STATUS
		string "Read playback status"
		default "AT+MV"

	comment "Response commands"

	config BT_AT_CONN_START
		string "Event: connection started"
		default "II"
	config BT_AT_CONN_END
		string "Event: connection ended"
		default "IA"
	config BT_AT_PLAY_START
		string "Event: playback started"
		default "MB"
	config BT_AT_PLAY_END
		string "Event: playback ended"
		default "MA"
	config BT_AT_CONN_YES
		string "Status: connection established"
		default "C1"
	config BT_AT_CONN_NO
		string "Status: no connection"
		default "C0"
	config BT_AT_PLAY_YES
		string "Status: playback"
		default "MB"
	config BT_AT_PLAY_NO
		string "Status: no playback, connected"
		default "MA"
	config BT_AT_PLAY_DISCONN
		string "Status: no playback, disconnected"
		default "M0"
endmenu

menu "Events & actions"
	depends on FEAT_ANALOG

	comment "BSI Ignition enabled"

	config BSI_ON_ANALOG_PWR
		bool "Power on Analog PCB"
		select RADIO_ON_ANALOG_PWR

	config BSI_ON_BT_PAIRING
		bool "Enable pairing mode"
		depends on FEAT_BT && BSI_ON_ANALOG_PWR

	config BSI_ON_BT_CONNECT
		bool "Connect to last Bluetooth device"
		depends on FEAT_BT && BSI_ON_ANALOG_PWR

	comment "Radio enabled"

	config RADIO_ON_ANALOG_PWR
		bool "Power on Analog PCB"
		select RADIO_PLAY_ANALOG_PWR

	config RADIO_ON_BT_PAIRING
		bool "Enable pairing mode"
		depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR)

	config RADIO_ON_BT_CONNECT
		bool "Connect to last Bluetooth device"
		depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR) && !BSI_ON_BT_CONNECT

	# config RADIO_ON_BT_PLAY
	# 	bool "Play Bluetooth music (if connected)"
	# 	depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR)

	config RADIO_ON_AUX_PLAY
		bool "Play AUX music"
		depends on (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR) && FEAT_HS_BTN

	comment "Radio playing (source changed to CDC)"

	config RADIO_PLAY_ANALOG_PWR
		bool "Power on Analog PCB"

	config RADIO_PLAY_BT_PAIRING
		bool "Enable pairing mode"
		depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR || RADIO_PLAY_ANALOG_PWR)

	config RADIO_PLAY_BT_CONNECT
		bool "Connect to last Bluetooth device"
		depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR || RADIO_PLAY_ANALOG_PWR) && !BSI_ON_BT_CONNECT && !RADIO_ON_BT_CONNECT

	# config RADIO_PLAY_BT_PLAY
	# 	bool "Play Bluetooth music (if connected)"
	# 	depends on FEAT_BT && (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR || RADIO_PLAY_ANALOG_PWR)

	config RADIO_PLAY_AUX_PLAY
		bool "Play AUX music"
		depends on (BSI_ON_ANALOG_PWR || RADIO_ON_ANALOG_PWR || RADIO_PLAY_ANALOG_PWR) && FEAT_HS_BTN

	comment "Bluetooth device connected"

	config BT_CONN_RADIO_EN_PLAY
		bool "Play music if radio enabled"
		depends on FEAT_BT

	config BT_CONN_RADIO_SRC_PLAY
		bool "Play music if radio playing"
		depends on FEAT_BT

	comment "Bluetooth device disconnected"

	config BT_DISCONN_PAIRING
		bool "Enable pairing mode"
		depends on FEAT_BT

	comment "Bluetooth music playing"

	config BT_PLAY_AUX_PAUSE
		bool "Pause AUX music"
		depends on FEAT_BT && FEAT_HS_BTN

	comment "AUX music playing"

	config AUX_PLAY_BT_PAUSE
		bool "Pause Bluetooth music"
		depends on FEAT_BT && FEAT_AUXDET

	comment "Radio paused (source changed to FM/CD)"

	config RADIO_PAUSE_BT_PAUSE
		bool "Pause Bluetooth music"
		depends on FEAT_BT

	config RADIO_PAUSE_AUX_PAUSE
		bool "Pause AUX music"
		depends on FEAT_HS_BTN

	config RADIO_PAUSE_BT_DISCONNECT
		bool "Disconnect Bluetooth device"
		depends on FEAT_BT

	config RADIO_PAUSE_BT_PAIRING_OFF
		bool "Disable pairing mode"
		depends on FEAT_BT

	config RADIO_PAUSE_ANALOG_PWR
		bool "Power off Analog PCB"
		select RADIO_OFF_ANALOG_PWR

	comment "Radio disabled"

	config RADIO_OFF_BT_PAUSE
		bool "Pause Bluetooth music"
		depends on FEAT_BT

	config RADIO_OFF_AUX_PAUSE
		bool "Pause AUX music"
		depends on FEAT_HS_BTN

	config RADIO_OFF_BT_DISCONNECT
		bool "Disconnect Bluetooth device"
		depends on FEAT_BT

	config RADIO_OFF_BT_PAIRING_OFF
		bool "Disable pairing mode"
		depends on FEAT_BT

	config RADIO_OFF_ANALOG_PWR
		bool "Power off Analog PCB"
		select BSI_OFF_ANALOG_PWR

	comment "BSI Ignition disabled"

	config BSI_OFF_ANALOG_PWR
		bool "Power off Analog PCB"
endmenu

comment "Bluetooth connection (intervals in seconds; 0 to disable)"

config BT_POLL_CONN_STATE
	int "Connection state polling interval"
	default 10

config BT_POLL_PLAY_STATE
	int "Playback state polling interval"
	default 10

config BT_RECONNECT_INTERVAL
	int "Automatic reconnection interval"
	default 20

config BT_RECONNECT_AUX_WAIT
	int "Wait for Bluetooth reconnection when using AUX"
	depends on FEAT_BT && FEAT_AUXDET && (BSI_ON_BT_CONNECT || RADIO_ON_BT_CONNECT || RADIO_PLAY_BT_CONNECT)
	default 10
	help
		When playing music on AUX, delay automatic Bluetooth reconnection.

		If disabled, even a 1-second silence in AUX input can cause a BT reconnection attempt, which
		will probably play "pairing mode" sound, which may be undesired.

comment "Miscellaneous options"

config GPIO_TICK_MS
	int "Headset emulation & AUX detection base interval (ms)"
	depends on FEAT_AUXDET || FEAT_HS_BTN
	default 200
	help
		Base interval for a GPIO tick.

		Headset buttons will be pressed for this period.

		AUX signal detection will be performed every 5th tick.