Programming

Here you will find the details needed for develop your own firmware for the device
If you are interested in writing firmware for the VALTRACK-V4-VTS device, you will need to know where is each pin of MCU is connected to.
Since the schematics of the device is not yet openly available, We are providing the MCU pin connection details, which should be able to help you in determining how is the whole architecture laid out. Watching our device intro video would also help to get an overall idea on the hardware present on board.
MCU Pinout Details
Pin Number
Pin Name
Net Name
Connected to
2, 3, 11, 17, 18, 31, 32
VDD3P3, VDD3P3_RTC, VDD3P3_CPU, VDD_SPI,         VDDA
3V3DC
3.3VDC output of LDO
19, 20, 21, 22, 23, 24
SPIHD, SPIWP, SPICS0, SPICLK, SPID, SPIQ
CLK_IN
32.768 KHz crystal
1
LNA_IN
RF_ANTENNA
Bluetooth / WiFi Chip antenna via matching network
4
GPIO0
LPUART1_TX
Cellular module RXD input pin through level translator.
5
GPIO1
LPUART1_RX
Cellular module TXD output pin through level translator.
6
GPIO2
ANALOG_IN
VCHG input through voltage divider resistor network.
R22,R33 govern the voltage at this pin.
Default values : R22 = 100K, R33 = 3.3K
7
CHIP_PU
CHIP_PU
CHIP_PU line 
9
GPIO4
TPS_ENABLE
Enable input of switching regulator TPS54240
Making this pin high powers the system via VCHG connector.
This  will cause system into reset loop if no alternate backup battery power available 
Do no activate this pin without connecting a 3,7V battery to avoid Race around condition
10
GPIO5
IIC_DATA
I2C data of LIS3DH Accelerometer 
12
GPIO6
IIC_CLK
I2C clock of LIS3DH Accelerometer 
13
GPIO7
SIM_PWRKEY_3V3
Cellular module PWRKEY pin through N channel MOSFET.
Making this pin HIGH pulls PWRKEY pin to GND
14
GPIO8
LED_SIGNAL
WS2812B battery LED input
15
GPIO9
GPIO9
Tactile switch input
Pulled up, filtered and Active LOW
16
GPIO10
GSM_ENABLE
Enable input of power gating MOSFET for Cellular module
Making this pin high provides ~4VDC to Cellular module
25
GPIO18
USB_DN
USB DP line
27
GPIO20
U0RXD
Drawn to test points
28
GPIO21
U0TXD
Drawn to test points
29
XTAL_N
OSC_OUT
40 MHz crystal
30
XTAL_P
OSC_IN
40 MHz crystal
26
GPIO19
USB_DP
USB DN line
33
GND
GND POWER PAD
GND
J62 - VCHG Connector [SMT pads] - Pinout Details
Pin Number
Pin Name
Connected to
1
VCHG
VCHG input of system through FUSE and diode
12VDC to 42VDC input
2
GND
System Ground
J41 - VBAT Connector [SMT pads] - Pinout Details
Pin Number
Pin Name
Connected to
1
VBAT
VBAT input of system or Backup battery input
3.7V to 4.2V battery input
2
GND
System Ground

Configuration

Schematics

Last modified 8mo ago

Pin Number	Pin Name	Net Name	Connected to
2, 3, 11, 17, 18, 31, 32	VDD3P3, VDD3P3_RTC, VDD3P3_CPU, VDD_SPI, VDDA	3V3DC	3.3VDC output of LDO
19, 20, 21, 22, 23, 24	SPIHD, SPIWP, SPICS0, SPICLK, SPID, SPIQ	CLK_IN	32.768 KHz crystal
1	LNA_IN	RF_ANTENNA	Bluetooth / WiFi Chip antenna via matching network
4	GPIO0	LPUART1_TX	Cellular module RXD input pin through level translator.
5	GPIO1	LPUART1_RX	Cellular module TXD output pin through level translator.
6	GPIO2	ANALOG_IN	VCHG input through voltage divider resistor network. R22,R33 govern the voltage at this pin. Default values : R22 = 100K, R33 = 3.3K
7	CHIP_PU	CHIP_PU	CHIP_PU line
9	GPIO4	TPS_ENABLE	Enable input of switching regulator TPS54240 Making this pin high powers the system via VCHG connector. This will cause system into reset loop if no alternate backup battery power available Do no activate this pin without connecting a 3,7V battery to avoid Race around condition
10	GPIO5	IIC_DATA	I2C data of LIS3DH Accelerometer
12	GPIO6	IIC_CLK	I2C clock of LIS3DH Accelerometer
13	GPIO7	SIM_PWRKEY_3V3	Cellular module PWRKEY pin through N channel MOSFET. Making this pin HIGH pulls PWRKEY pin to GND
14	GPIO8	LED_SIGNAL	WS2812B battery LED input
15	GPIO9	GPIO9	Tactile switch input Pulled up, filtered and Active LOW
16	GPIO10	GSM_ENABLE	Enable input of power gating MOSFET for Cellular module Making this pin high provides ~4VDC to Cellular module
25	GPIO18	USB_DN	USB DP line
27	GPIO20	U0RXD	Drawn to test points
28	GPIO21	U0TXD	Drawn to test points
29	XTAL_N	OSC_OUT	40 MHz crystal
30	XTAL_P	OSC_IN	40 MHz crystal
26	GPIO19	USB_DP	USB DN line
33	GND	GND POWER PAD	GND