Vaaman GPIO Description

Vicharak Vaaman board features a 40-pin GPIO (General-Purpose Input/Output) header that provides flexible options for connecting and controlling external devices. Through software settings, you can configure these pins as either input or output, making them adaptable for various applications.

Out of the 40 pins on the header, 27 are dedicated GPIO pins. These GPIO pins can also be repurposed for SPI (Serial Peripheral Interface), UART (Universal Asynchronous Receiver-Transmitter), and I2C (Inter-Integrated Circuit) functions.

This versatility opens up a wide array of possibilities for interfacing with different components and facilitating communication with other devices.

Tip

What? you want more GPIOs?

Fear not, we have a solution for you. Vaaman board has additional 40-FPGA GPIOs available to the user.
These GPIOs are accessible from the FPGA and can be configured to be used inside your project and applications

GPIO Voltage Level

RK3399 SoC has three multiple GPIO voltage levels. Below table shows the voltage level of vaaman GPIOs.

GPIO	Voltage Level	Tolerance
ADC_IN0	1.8V	~1.98V
GPIO3_C0 (Pin 32)	3.3V	~3.46V
Other GPIOs	3.0V	~3.15V

Available GPIOs on Vaaman

Vicharak Vaaman board has total 80 GPIOs available for user. 40 GPIOs are accessible on 40 pin header and 40 GPIOs are accessible from FPGA. Below table shows the GPIOs available on Vaaman board.

Warning

Not all functions can be used at the same time. Only one function can be used or assigned to a GPIO at a time.

SoC GPIOs Header

GPIO number	Function2	Function1	GPIO	Pin#	Pin#	GPIO	Function1	GPIO number
		+3.3V		1	2		+5.0V
		I2C7_SDA		3	4		+5.0V
		I2C7_SCL		5	6		GND
75		SPI2_CLK	GPIO2_B3	7	8	GPIO4_C4	UART2_TXD	148
		GND		9	10	GPIO4_C3	UART2_RXD	147
146		PWM0	GPIO4_C2	11	12	GPIO4_A3	I2S1_SCLK	131
150		PWM1	GPIO4_C6	13	14		GND
149		SPDIF_TX	GPIO4_C5	15	16	GPIO4_D2		154
		+3.3V		17	18	GPIO4_D4		156
		+5V		19	20		GND
		GND		21	22	GPIO4_D5		157
		+5V		23	24		GND
		GND		25	26		ADC_IN0
64		I2C2_SDA	GPIO2_A0	27	28	GPIO2_A1	I2C2_CLK	65
74	I2C6_SCL	SPI2_TXD	GPIO2_B2	29	30		GND
73	I2C6_SDA	SPI2_RXD	GPIO2_B1	31	32	GPIO3_C0	SPDIF_TX	112
76		SPI2_CSn	GPIO2_B4	33	34		GND
133		I2S1_LRCK_TX	GPIO4_A5	35	36	GPIO4_A4	I2S1_LRCK_RX	132
158			GPIO4_D6	37	38	GPIO4_A6	I2S1_SDI	134
		GND		39	40	GPIO4_A7	I2S1_SDO	135

Note

• The default function of pins marked in orange are specific to this board. For example, Pins 3 and 5 cannot be used as GPIOs because they are connected to the I2C bus and are already in use.

• All pins, except those for power supply, are directly connected to the System-on-Chip (SoC).

• Pin 7 is directly connected to the MIPI CSI pin on the board. Instructions to use UART2 as serial console can be found in Serial Console, and to disable it, refer to Vicharak Config Device tree overlays section.

• Both UART2 and UART4 support a wide range of baud rates, including 115200bps, 500000bps, 1500000bps, and more.

FGPA Header

Function	GPIO	Pin#	Pin#	GPIO	Function
+5.0V		1	2		+3.3V
+5.0V		3	4		+3.3V
LVDS/GPIO	GPIOT_RX28_P	5	6	GPIOT_RX28_N	LVDS/GPIO
GPIO	GPIO_73	7	8	GPIO_75	GPIO
GPIO	GPIO_173	9	10	GPIO_72	GPIO
GPIO	GPIO_174	11	12	GPIO_178	GPIO
LED	USER_LEDS3	13	14	GPIO_183	GPIO
LED	USER_LEDS2	15	16	USER_LED0	LED
GPIO	GPIO_63	17	18	USER_LED1	LED
GND		19	20		GND
GND		21	22		GND
LVDS/GPIO	RX29_CLK2_N	23	24	RX29_CLK2_P	LVDS/GPIO
CDI	CDI6	25	26		GND
GND		27	28		GND
GPIO	GPIO_168	29	30	GPIO_187	GPIO
GPIO	GPIO_17	31	32	CDI7	CDI
CDI	CDI5	33	34	GPIO_66	GPIO
CDI	CDI4	35	36	GPIO_62	GPIO
GND		37	38		GND
+3.3V		39	40		+3.3V

::{note}

• The default function of pins marked in orange is specific to this board. For example, pin 13, 15, 16 and 16 are used as LEDs and they cannot be used as GPIOs.

• The pins layout from 29 to 40 follows the standard PMOD pinout. Check the PMOD page for more information.

• LVDS/GPIO pins can either be used as GPIOs or as LVDS pins. To use them as GPIOs, refer to Vicharak FPGA LVDS. section.

• CDI can be normally used as GPIOs.

GPIO Numbers translation

GPIO0	Number		GPIO1	Number		GPIO2	Number		GPIO3	Number		GPIO4	Number
A0	0		A0	32		A0	64		A0	96		A0	128
A1	1		A1	33		A1	65		A1	97		A1	129
A2	2		A2	34		A2	66		A2	98		A2	130
A3	3		A3	35		A3	67		A3	99		A3	131
A4	4		A4	36		A4	68		A4	100		A4	132
A5	5		A5	37		A5	69		A5	101		A5	133
A6	6		A6	38		A6	70		A6	102		A6	134
A7	7		A7	39		A7	71		A7	103		A7	135
B0	8		B0	40		B0	72		B0	104		B0	136
B1	9		B1	41		B1	73		B1	105		B1	137
B2	10		B2	42		B2	74		B2	106		B2	138
B3	11		B3	43		B3	75		B3	107		B3	139
B4	12		B4	44		B4	76		B4	108		B4	140
B5	13		B5	45		B5	77		B5	109		B5	141
B6	14		B6	46		B6	78		B6	110		B6	142
B7	15		B7	47		B7	79		B7	111		B7	143
C0	16		C0	48		C0	80		C0	112		C0	144
C1	17		C1	49		C1	81		C1	113		C1	145
C2	18		C2	50		C2	82		C2	114		C2	146
C3	19		C3	51		C3	83		C3	115		C3	147
C4	20		C4	52		C4	84		C4	116		C4	148
C5	21		C5	53		C5	85		C5	117		C5	149
C6	22		C6	54		C6	86		C6	118		C6	150
C7	23		C7	55		C7	87		C7	119		C7	151
D0	24		D0	56		D0	88		D0	120		D0	152
D1	25		D1	57		D1	89		D1	121		D1	153
D2	26		D2	58		D2	90		D2	122		D2	154
D3	27		D3	59		D3	91		D3	123		D3	155
D4	28		D4	60		D4	92		D4	124		D4	156
D5	29		D5	61		D5	93		D5	125		D5	157
D6	30		D6	62		D6	94		D6	126		D6	158
D7	31		D7	63		D7	95		D7	127		D7	159

See also

Configure 40-Pin header using vicharak-config utility