Nook Glowlight 4

Chips • Screen • Backlight • Touch • Buttons • USB • Bluetooth • SD Card • UARTs • PinMux

"Nook Glowlight Plus" 7.8" 2019

Model	BNRV700
Code name	Quill
Board	E70Q50
USB Vid/Pid	2080/000C

Chips

Chip	Function
Freescale MCIMX6L8DVN10AB	iMX6 ARM A9, 1GHz processor, with GPU
Samsung KLM8G1GETF-B041	8GB eMMC
Nanya NT6TL256T32BQ-G0	1GB DRAM
Ricoh RC5T619	power management
BWNBBA	eInk power
Elan eKTH3676CAY	capacitive touch sensor
Realtek ALC5672	audio
Realtek RTL8723DS	802.11bgn 2.4G, Bluetooth 4.0, 4.2

Screen

Model	eInk ED078KC1
Interface	16 bit
Density	300px/in
Width	1404px	4.680"
Height	1872px	6.240"
Diagonal		7.800"
Aspect	3:4

Backlight

There are 10 cool LEDs and 9 warm LEDs that edge light a .014" thick plastic layer.

Touch sensor

The touch sensor is capacitive and has a total of 100 inputs.
The vertical stripes (i.e. horizontal position) are divided between 30 stripes for the upper half of the screen and 30 stripes for the lower half.
The horizontal stripes (i.e. vertical position) number 40.
This yields a raw resolution of 30 x 40 before interpolation.
The driver supports a maximum of two simultaneous touches.
The substrate is .017" thick

PCB	Signal	Con5
TP216	NC	1
TP217	NC	2
TP114	SCL	3
TP113	SDA	4
TP111	Int	5
TP109	Reset	6
	VDD	7
	Gnd	8

The interface is I²C and uses addresses 0x10, 0x78, 0x79.

Buttons

Below are the scan codes and mapped keycodes for the six physical buttons.
The mapping is done by /system/usr/keylayout/imx-keypad.kl

116 Power
191 F10	193 F11
192 F9	194 F12
102 Home

USB

The USB situation with regard to USB host mode is the same as with the other Glowlights.
The Id pin on the USB connector is only brought out to a test point and is dead-ended.
There is no provision for supplying power from the Nook to the peripheral for host mode.
You can switch to host mode by altering the pullup in the pinmux using mmap.
A back-powering USB hub is necessary for operation.

Bluetooth

Using the iRig BlueBoard 4 button footpedal (BLE GATT) with a custom app has worked.
Using a custom hardware footpedal (BT HID) has paired and worked.

SD Card

There are four SD card interfaces:

SD1 – unused
SD2 – available on test points
SD3 – used for WiFi controller
SD4 – used for internal flash

There are test points for a removable SD card as SD2.
An SD card may be wired in as the driver is already configured.
(Although you will have to mount your partitions or change fstab.)
The test point numbers match the physical order of connection on an SD card.
The card detect signal (TP398) must be grounded.

Note that a standard SD has a wacky numbering system.
Counting from the bevelled corner it goes 9-1-2-3-4-5-6-7-8.

PCB	Pad	Signal	Use	µ SD	Std SD
TP390	SD2_DATA2		D2	1	9
TP391	SD2_DATA3		D3	2	1
TP392	SD2_CMD		Cmd	3	2
TP393			VDD	4	4
TP394	SD2_CLK		Clk	5	5
TP395			Gnd	6	6
TP396	SD2_DATA0		D0	7	7
TP397	SD2_DATA1		D1	8	8
TP398	SD2_DATA4	GPIO5_IO02	/CD

UARTs

UART	Location	Pad	Signal	Device
UART1	J1	UART1_TXD	UART1_TX_DATA	ttymxc0
UART1	J1	UART1_RXD	UART1_RX_DATA	ttymxc0
UART2	Bluetooth	LCD_HSYNC	UART2_TX_DATA	ttymxc1
		LCD_ENABLE	UART2_RX_DATA
		LCD_RESET	UART2_CTS_B
		LCD_VSYNC	UART2_RTS_B
UART4	TP199	KEY_ROW6	UART4_TX_DATA	(none)
UART4	TP199	KEY_COL6	UART4_RX_DATA	(none)

PinMux

Pad	Function	Ohm	MHz	PU/D	MuxCtl	PadCtl
AUD_MCLK	AUDIO_CLK_OUT	40	100	100D	00000000	000130B0
AUD_RXC	GPIO1_IO01	40	100	100D	00000005	000110B0
AUD_RXD	AUD3_RXD	40	100	100D	00000000	000130B0
AUD_RXFS	GPIO1_IO00	40	100	100D	00000005	000110B0
AUD_TXC	AUD3_TXC	40	100	100D	00000000	000130B0
AUD_TXD	AUD3_TXD	40	100	100D	00000000	000130B0
AUD_TXFS	AUD3_TXFS	40	100	100D	00000000	000130B0
ECSPI1_MISO	GPIO4_IO10	40	100		00000005	000100B1
ECSPI1_MOSI	GPIO4_IO09	40	100		00000005	000100B1
ECSPI1_SCLK	GPIO4_IO08	40	100		00000005	000100B1
ECSPI1_SS0	GPIO4_IO11	40	100		00000005	000100B1
ECSPI2_MISO	GPIO4_IO14	40	100	100D	00000005	000110B0
ECSPI2_MOSI	GPIO4_IO13	40	100	100D	00000005	000110B0
ECSPI2_SCLK	GPIO4_IO12	40	100	100D	00000005	000110B0
ECSPI2_SS0	GPIO4_IO15	40	100	100D	00000005	000110B0
EPDC_BDR0	EPDC_BDR0	40	100	100D	00000000	000110B0
EPDC_BDR1	GPIO2_IO06	40	100	100D	00000005	000110B0
EPDC_DATA00	EPDC_DATA00	40	100	100D	00000000	000110B0
EPDC_DATA01	EPDC_DATA01	40	100	100D	00000000	000110B0
EPDC_DATA10	EPDC_DATA10	40	100	100D	00000000	000110B0
EPDC_DATA11	EPDC_DATA11	40	100	100D	00000000	000110B0
EPDC_DATA12	EPDC_DATA12	40	100	100D	00000000	000110B0
EPDC_DATA13	EPDC_DATA13	40	100	100D	00000000	000110B0
EPDC_DATA14	EPDC_DATA14	40	100	100D	00000000	000110B0
EPDC_DATA15	EPDC_DATA15	40	100	100D	00000000	000110B0
EPDC_DATA02	EPDC_DATA02	40	100	100D	00000000	000110B0
EPDC_DATA03	EPDC_DATA03	40	100	100D	00000000	000110B0
EPDC_DATA04	EPDC_DATA04	40	100	100D	00000000	000110B0
EPDC_DATA05	EPDC_DATA05	40	100	100D	00000000	000110B0
EPDC_DATA06	EPDC_DATA06	40	100	100D	00000000	000110B0
EPDC_DATA07	EPDC_DATA07	40	100	100D	00000000	000110B0
EPDC_DATA08	EPDC_DATA08	40	100	100D	00000000	000110B0
EPDC_DATA09	EPDC_DATA09	40	100	100D	00000000	000110B0
EPDC_GDCLK	EPDC_GDCLK	40	100	100D	00000000	000110B0
EPDC_GDOE	EPDC_GDOE	40	100	100D	00000000	000110B0
EPDC_GDRL	EPDC_GDRL	40	100	100D	00000000	000110B0
EPDC_GDSP	EPDC_GDSP	40	100	100D	00000000	000110B0
EPDC_PWR_COM	USB_OTG1_ID	40	100	100U	00000004	0001B0B1
EPDC_PWR_CTRL0	GPIO2_IO07	40	100	100D	00000005	000110B0
EPDC_PWR_CTRL1	GPIO2_IO08	40	100	100D	00000005	000110B0
EPDC_PWR_CTRL2	GPIO2_IO09	40	100	100D	00000005	000110B0
EPDC_PWR_CTRL3	GPIO2_IO10	40	100	100D	00000005	000110B0
EPDC_PWR_IRQ	GPIO2_IO12	40	100	100D	00000005	000110B0
EPDC_PWR_STAT	GPIO2_IO13	HiZ	0	100U	00000005	0000B000
EPDC_PWR_WAKE	GPIO2_IO14	40	100	100D	00000005	000110B0
EPDC_SDCE0	EPDC_SDCE0	40	100	100D	00000000	000110B0
EPDC_SDCE1	EPDC_SDCE1	40	100	100D	00000000	000110B0
EPDC_SDCE2	GPIO1_IO29	40	100	100D	00000005	000110B0
EPDC_SDCE3	GPIO1_IO30	40	100	100D	00000005	000110B0
EPDC_SDCLK	EPDC_SDCLK_P	40	100	100D	00000000	000110B0
EPDC_SDLE	EPDC_SDLE	40	100	100D	00000000	000110B0
EPDC_SDOE	EPDC_SDOE	40	100	100D	00000000	000110B0
EPDC_SDSHR	EPDC_SDSHR	40	100	100D	00000000	000110B0
EPDC_VCOM0	GPIO2_IO03	40	100	100D	00000005	000110B0
EPDC_VCOM1	GPIO2_IO04	40	100	100D	00000005	000110B0
FEC_CRS_DV	SD4_DATA1	40	50	22U	00000001	0001F071
FEC_MDC	SD4_DATA4	40	50	22U	00000001	0001F071
FEC_MDIO	SD4_CLK	40	50	22U	00000001	0001F071
FEC_REF_CLK	GPIO4_IO26	HiZ	0		00000005	00004000
FEC_RX_ER	SD4_DATA0	40	50	22U	00000001	0001F071
FEC_RX_DATA0	SD4_DATA5	40	50	22U	00000001	0001F071
FEC_RX_DATA1	SD4_DATA2	40	50	22U	00000001	0001F071
FEC_TX_CLK	SD4_CMD	40	50	22U	00000001	0001F071
FEC_TX_EN	SD4_DATA6	40	50	22U	00000001	0001F071
FEC_TX_DATA0	SD4_DATA3	40	50	22U	00000001	0001F071
FEC_TX_DATA1	SD4_DATA7	40	50	22U	00000001	0001F071
USB_H_DATA	GPIO3_IO19	40	0	100D	00000005	00013030
USB_H_STROBE	GPIO3_IO20	40	0	100D	00000005	00013030
I2C1_SCL	I2C1_SCL	40	100	22U	00000010	0001F8B1
I2C1_SDA	I2C1_SDA	40	100	22U	00000010	0001F8B1
I2C2_SCL	I2C2_SCL	40	100	22U	00000010	0001F8B1
I2C2_SDA	I2C2_SDA	40	100	22U	00000010	0001F8B1
KEY_COL0	GPIO3_IO24	120	0	100U	00000005	0001B010
KEY_COL1	GPIO3_IO26	40	100	100U	00000005	0001B0B1
KEY_COL2	GPIO3_IO28	120	0	100U	00000005	0001B010
KEY_COL3	GPIO3_IO30	40	100	100D	00000005	000110B0
KEY_COL4	GPIO4_IO00	120	0	22U	00000005	0001F010
KEY_COL5	GPIO4_IO02	120	0	22U	00000005	0001F010
KEY_COL6	GPIO4_IO04	HiZ	0		00000005	00000000
KEY_COL7	GPIO4_IO06	HiZ	0		00000005	00000000
KEY_ROW0	GPIO3_IO25	40	0	100D	00000005	00011030
KEY_ROW1	GPIO3_IO27	40	0	100D	00000005	00011030
KEY_ROW2	GPIO3_IO29	40	100	100U	00000005	0001B0B1
KEY_ROW3	GPIO3_IO31	40	100	100U	00000005	0001B0B1
KEY_ROW4	GPIO4_IO01	40	100	100U	00000005	0001B0B1
KEY_ROW5	GPIO4_IO03	40	100	100U	00000005	0001B0B1
KEY_ROW6	GPIO4_IO05	HiZ	0		00000005	00000000
KEY_ROW7	GPIO4_IO07	HiZ	0		00000005	00000000
LCD_CLK	GPIO2_IO15	40	100	100D	00000005	000110B0
LCD_DATA00	GPIO2_IO20	40	100	100D	00000005	000110B0
LCD_DATA01	GPIO2_IO21	40	100	100D	00000005	000110B0
LCD_DATA10	GPIO2_IO30	40	100	100D	00000005	000110B0
LCD_DATA11	GPIO2_IO31	40	100	100D	00000005	000110B0
LCD_DATA12	GPIO3_IO00	40	100	100D	00000005	000110B0
LCD_DATA13	GPIO3_IO01	40	100	100D	00000005	000110B0
LCD_DATA14	GPIO3_IO02	40	100	100D	00000005	000110B0
LCD_DATA15	GPIO3_IO03	40	100	100D	00000005	000110B0
LCD_DATA16	GPIO3_IO04	40	100	100D	00000005	000110B0
LCD_DATA17	GPIO3_IO05	40	100	100D	00000005	000110B0
LCD_DATA18	GPIO3_IO06	40	100	100D	00000005	000110B0
LCD_DATA19	GPIO3_IO07	40	100	100D	00000005	000110B0
LCD_DATA02	GPIO2_IO22	40	100	100D	00000005	000110B0
LCD_DATA20	GPIO3_IO08	40	100	100D	00000005	000110B0
LCD_DATA21	GPIO3_IO09	40	100	100D	00000005	000110B0
LCD_DATA22	GPIO3_IO10	40	100	100D	00000005	000110B0
LCD_DATA23	GPIO3_IO11	40	100	100D	00000005	000110B0
LCD_DATA03	GPIO2_IO23	40	100	100D	00000005	000110B0
LCD_DATA04	GPIO2_IO24	40	100	100D	00000005	000110B0
LCD_DATA05	GPIO2_IO25	40	100	100D	00000005	000110B0
LCD_DATA06	GPIO2_IO26	40	100	100D	00000005	000110B0
LCD_DATA07	GPIO2_IO27	40	100	100D	00000005	000110B0
LCD_DATA08	GPIO2_IO28	40	100	100D	00000005	000110B0
LCD_DATA09	GPIO2_IO29	40	100	100D	00000005	000110B0
LCD_ENABLE	UART2_RX_DATA	40	100	100U	00000004	0001B0B1
LCD_HSYNC	UART2_TX_DATA	40	100	100U	00000004	0001B0B1
LCD_RESET	UART2_CTS_B	80	50	100D	00000004	00003059
LCD_VSYNC	UART2_RTS_B	40	100	100U	00000004	0001B0B1
PWM1	PWM1_OUT	40	100	100D	00000000	000110B0
REF_CLK_24M	I2C3_SCL	40	100	22U	00000011	0001F8B1
REF_CLK_32K	I2C3_SDA	40	100	22U	00000011	0001F8B1
SD1_CLK	GPIO5_IO15	HiZ	0	47U	00000005	00017000
SD1_CMD	GPIO5_IO14	40	100	100D	00000005	000110B0
SD1_DATA0	GPIO5_IO11	HiZ	0	47U	00000005	00017000
SD1_DATA1	GPIO5_IO08	40	100	100D	00000005	000110B0
SD1_DATA2	GPIO5_IO13	40	100	100D	00000005	000110B0
SD1_DATA3	GPIO5_IO06	40	100	100D	00000005	000110B0
SD1_DATA4	GPIO5_IO12	40	100	100D	00000005	000110B0
SD1_DATA5	GPIO5_IO09	40	100	100D	00000005	000110B0
SD1_DATA6	GPIO5_IO07	40	100	100U	00000005	0001B0B1
SD1_DATA7	GPIO5_IO10	40	100	100D	00000005	000110B0
SD2_CLK	SD2_CLK	40	50	22U	00000000	0001F071
SD2_CMD	SD2_CMD	40	50	22U	00000000	0001F071
SD2_DATA0	SD2_DATA0	40	50	22U	00000000	0001F071
SD2_DATA1	SD2_DATA1	40	50	22U	00000000	0001F071
SD2_DATA2	SD2_DATA2	40	50	22U	00000000	0001F071
SD2_DATA3	SD2_DATA3	40	50	22U	00000000	0001F071
SD2_DATA4	GPIO5_IO02	40	100	100U	00000005	0001B0B1
SD2_DATA5	GPIO4_IO31	HiZ	0		00000005	00000000
SD2_DATA6	GPIO4_IO29	40	100	100U	00000005	0001B0B1
SD2_DATA7	GPIO5_IO00	40	100	100D	00000005	000110B0
SD2_RESET	GPIO4_IO27	40	100	100D	00000005	000110B0
SD3_CLK	SD3_CLK	40	50	22U	00000000	0001F071
SD3_CMD	SD3_CMD	40	50	22U	00000000	0001F071
SD3_DATA0	SD3_DATA0	40	50	22U	00000000	0001F071
SD3_DATA1	SD3_DATA1	40	50	22U	00000000	0001F071
SD3_DATA2	SD3_DATA2	40	50	22U	00000000	0001F071
SD3_DATA3	SD3_DATA3	40	50	22U	00000000	0001F071
UART1_RXD	UART1_RX_DATA	40	100	100U	00000000	0001B0B1
UART1_TXD	UART1_TX_DATA	40	100	100U	00000000	0001B0B1
WDOG_B	GPIO3_IO18	40	100	100D	00000005	000110B0

Note: EPDC pads are only in EPDC mode when actually updating display, otherwise they are in GPIO mode.
SD3 pads are only in SD3 mode when WiFi is enabled, otherwise they are in GPIO mode.
UART2 pads are only in UART2 mode when Bluetooth is enabled, otherwise they are in GPIO mode.