DesignWare(R) ARC(R) HS4x/HS4xD Development Kit

Overview

The ARC HS4x/HS4xD Development Kit is the next revision of Synopsys HSDK board. It includes a multicore ARC HS4xD-based chip that integrates a wide range of interfaces including Ethernet, HDMI, WiFi, Bluetooth, USB, SDIO, I2C, SPI, UART, I2S, ADC, PWM and GPIO, as well as a Think Silicon GPU.

For details about the board, see: ARC HS4x/HS4xD Development Kit (HSDK4xD)

Hardware

The ARC HSDK4xD has 24 general GPIOs, which divided into 8 groups named from GPIO_SEL_0 to GPIO_SEL_7. Each sel can configured for different functions, such as: GPIO, UART, SPI, I2C and PWM. We can program CREG_GPIO_MUX register to do configuration for each sel. Tables below show the bit definition for CREG_GPIO_MUX register and the details configuration for each pin.

Bit	Name	Access	Reset value	Description
2:0	GPIO_SEL_0	RW	0x0	GPIO mux select for gpio[3:0]
5:3	GPIO_SEL_1	RW	0x0	GPIO mux select for gpio[7:4]
8:6	GPIO_SEL_2	RW	0x0	GPIO mux select for gpio[11:8]
11:9	GPIO_SEL_3	RW	0x0	GPIO mux select for gpio[15:12]
14:12	GPIO_SEL_4	RW	0x0	GPIO mux select for gpio[17:16]
17:15	GPIO_SEL_5	RW	0x0	GPIO mux select for gpio[19:18]
20:18	GPIO_SEL_6	RW	0x0	GPIO mux select for gpio[21:20]
23:21	GPIO_SEL_7	RW	0x0	GPIO mux select for gpio[23:22]

SELS	GPIO PINS	FUN0	FUN1	FUN2	FUN3	FUN4	FUN5	FUN6	FUN7
SEL0	0	gpio[0]	uart0_cts	spi1_cs[0]	gpio[0]	gpio[0]	pwm_ch[6]	pwm_ch[6]	pwm_ch[1]
	1	gpio[1]	uart0_txd	spi1_mosi	gpio[1]	pwm_ch[0]	gpio[1]	pwm_ch[0]	pwm_ch[0]
	2	gpio[2]	uart0_rxd	spi1 _miso	i2c1_scl	gpio[2]	gpio[2]	gpio[2]	gpio[2]
	3	gpio[3]	uart0_rts	spi1_clk	i2c1_sda	gpio[3]	gpio[3]	gpio[3]	gpio[3]
SEL1	4	gpio[4]	uart1_cts	spi2_cs[0]	gpio[4]	gpio[4]	pwm_ch[4]	pwm_ch[4]	pwm_ch[3]
	5	gpio[5]	uart1_txd	spi2_mosi	gpio[5]	pwm_ch[2]	gpio[5]	pwm_ch[2]	pwm_ch[2]
	6	gpio[6]	uart1_rxd	spi2_miso	i2c2_scl	gpio[6]	gpio[6]	gpio[6]	gpio[6]
	7	gpio[7]	uart1_rts	spi2_clk	i2c2_sda	gpio[7]	gpio[7]	gpio[7]	gpio[7]
SEL2	8	gpio[8]	uart2_cts	spi1_cs[1]	gpio[8]	gpio[8]	pwm_ch[2]	pwm_ch[2]	pwm_ch[5]
	9	gpio[9]	uart2_txd	spi1_mosi	gpio[9]	pwm_ch[4]	gpio[9]	pwm_ch[4]	pwm_ch[4]
	10	gpio[10]	uart2_rxd	spi1_miso	i2c1_scl	gpio[10]	gpio[10]	gpio[10]	gpio[10]
	11	gpio[11]	uart2_rts	spi1_clk	i2c1_sda	gpio[11]	gpio[11]	gpio[11]	gpio[11]
SEL3	12	gpio[12]	uart0_cts	spi2_cs[1]	gpio[12]	gpio[12]	pwm_ch[0]	pwm_ch[0]	pwm_ch[7]
	13	gpio[13]	uart0_txd	spi2_mosi	gpio[13]	pwm_ch[6]	gpio[13]	pwm_ch[6]	pwm_ch[6]
	14	gpio[14]	uart0_rxd	spi2_miso	i2c2_scl	gpio[14]	gpio[14]	gpio[14]	gpio[14]
	15	gpio[15]	uart0_rts	spi2_clk	i2c2_sda	gpio[15]	gpio[15]	gpio[15]	gpio[15]
SEL4	16	gpio[16]	uart1_txd	spi1_cs[2]	i2c1_scl	gpio[16]	pwm_fault_0	gpio[16]	pwm_fault_0
	17	gpio[17]	uart1_rxd	spi1_mosi	i2c1_sda	pwm_ch[0]	pwm_ch[0]	pwm_ch[5]	pwm_ch[5]
SEL5	18	gpio[18]	uart2_txd	spi1_miso	i2c2_scl	gpio[18]	gpio[18]	gpio[18]	gpio[18]
	19	gpio[19]	uart2_rxd	spi1_clk	i2c2_sda	gpio[19]	gpio[19]	gpio[19]	gpio[19]
SEL6	20	gpio[20]	uart0_txd	spi2_cs[2]	i2c1_scl	gpio[20]	pwm_fault_1	gpio[20]	pwm_fault_1
	21	gpio[21]	uart0_rxd	spi2_mosi	i2c1_sda	pwm_ch[6]	pwm_ch[6]	pwm_ch[3]	pwm_ch[3]
SEL7	22	gpio[22]	uart2_txd	spi2_miso	i2c2_scl	gpio[22]	gpio[22]	gpio[22]	gpio[22]
	23	gpio[23]	uart2_rxd	spi2_clk	i2c2_sda	gpio[23]	gpio[23]	gpio[23]	gpio[23]

Digilent Pmod

The ARC HSDK4xD features two 12-pin Pmod connectors Pmod_A and Pmod_B and one 6-pin Pmod connector Pmod_C. The functionality of the Pmod connectors is programmable and includes GPIO, UART, SPI, I2C and PWM. The location of the pins on the Pmod connectors is shown in Figure below. Detailed pin descriptions depending on the pin multiplexer settings are provided in the subsequent sections.

Pmod_A Connector

Table below lists the pin assignment of valid protocols that can be multiplexed on the Pmod_A connector. The GPIO column is the default assignment after Reset.

Pin	GPIO	UART	SPI	I2C	PWM_1	PWM_2
A1	gpio[8]	uart2_cts	spi1_cs[1]	gpio[8]	gpio[8]	pwm_ch[2]
A2	gpio[9]	uart2_txd	spi1_mosi	gpio[9]	pwm_ch[4]	gpio[9]
A3	gpio[10]	uart2_rxd	spi1_miso	i2c1_scl	gpio[10]	gpio[10]
A4	gpio[11]	uart2_rts	spi1_clk	i2c1_sda	gpio[11]	gpio[11]
A5	GND	GND	GND	GND	GND	GND
A6	3V3	3V3	3V3	3V3	3V3	3V3
A7	gpio[20]	gpio[20]	gpio[20]	gpio[20]	gpio[20]	gpio[20]
A8	gpio[21]	gpio[21]	gpio[21]	gpio[21]	gpio[21]	gpio[21]
A9	n.c.	n.c.	n.c.	n.c.	n.c.	n.c.
A10	n.c.	n.c.	n.c.	n.c.	n.c.	n.c.
A11	GND	GND	GND	GND	GND	GND
A12	3V3	3V3	3V3	3V3	3V3	3V3

Pmod_B Connector

Table below lists the pin assignment of valid protocols that can be multiplexed on the Pmod_B connector. The GPIO column is the default assignment after Reset.

Pin	GPIO	UART	SPI	I2C	PWM_1	PWM_2
B1	gpio[12]	uart0_cts	spi2_cs[1]	gpio[12]	gpio[12]	pwm_ch[0]
B2	gpio[13]	uart0_txd	spi2_mosi	gpio[13]	pwm_ch[6]	gpio[13]
B3	gpio[14]	uart0_rxd	spi2_miso	i2c2_scl	gpio[14]	gpio[14]
B4	gpio[15]	uart0_rts	spi2_clk	i2c2_sda	gpio[15]	gpio[15]
B5	GND	GND	GND	GND	GND	GND
B6	3V3	3V3	3V3	3V3	3V3	3V3
B7	gpio[22]	gpio[22]	gpio[22]	gpio[22]	gpio[22]	gpio[22]
B8	gpio[23]	gpio[23]	gpio[23]	gpio[23]	gpio[23]	gpio[23]
B9	n.c.	n.c.	n.c.	n.c.	n.c.	n.c.
B10	n.c.	n.c.	n.c.	n.c.	n.c.	n.c.
B11	GND	GND	GND	GND	GND	GND
B12	3V3	3V3	3V3	3V3	3V3	3V3

Pmod_C Connector

Table below lists the pin assignment of valid protocols that can be multiplexed on the Pmod_C connector. The GPIO column is the default assignment after Reset.

Pin	GPIO	UART	SPI	I2C	PWM
C1	gpio[16]	uart1_txd	spi1_cs[2]	i2c1_scl	gpio[16]
C2	gpio[17]	uart1_rxd	spi1_mosi	i2c1_sda	pwm_ch[0]
C3	gpio[18]	uart2_txd	spi1_miso	i2c2_scl	gpio[18]
C4	gpio[19]	uart2_rxd	spi1_clk	i2c2_sda	gpio[19]
C5	GND	GND	GND	GND	GND
C6	3V3	3V3	3V3	3V3	3V3

Mikrobus

The ARC HSDK4xD features a set of MikroBUS headers. Figure below shows the relevant function assignments, fully compatible with the MikroBUS standard. Table below shows the pin assignment on the I/O Multiplexer.

Pin	I/O	Pin	I/O
AN	ADC VIN6*	PWM	pwm_ch[0]
RST	GPX_Port0_bit1	INT	gpio[16]
CS	spi2_cs[1]	RX	uart2_rxd
SCK	spi2_clk	TX	uart2_txd
MISO	spi2_miso	SCL	i2c2_scl
MOSI	spi2_mosi	SDA	i2c2_sda

Note

ADC VIN6 is available through the on-board ADC and is read though SPI0 using SPI chip select 1.

Arduino

The ARC HSDK4xD provides an Arduino shield interface. Figure below shows the relevant function assignments. The Arduino shield interface is compatible with the Arduino UNO R3 with the following exceptions: 5 Volt shields are not supported, the IOREF voltage on the ARC HSDK4xD board is fixed to 3V3. Note that the ICSP header is also not available. Most shields do not require this ICSP header as the SPI master interface on this ICSP header is also available on the IO10 to IO13 pins.

Table below shows the pin assignment on the I/O Multiplexer. Multiplexing is controlled by software using the CREG_GPIO_MUX register (see Pinmux ). After a reset, all ports are configured as GPIO inputs.

Pin	I/O-1	I/O-2	I/O-3
AD0	ADC VIN0*	GPX_port0_bit2
AD1	ADC VIN1*	GPX_port0_bit3
AD2	ADC VIN2*	GPX_port0_bit4
AD3	ADC VIN3*	GPX_port0_bit5
AD4	ADC VIN4*	gpio[18]	i2c2_sda
AD5	ADC VIN5*	gpio[19]	i2c2_scl
IO0	gpio[23]	uart2_rxd
IO1	gpio[22]	uart2_txd
IO2	gpio[16]
IO3	gpio[17]	pwm_ch[5]
IO4	gpio[11]
IO5	gpio[9]	pwm_ch[4]
IO6	gpio[21]	pwm_ch[3]
IO7	gpio[20]
IO8	gpio[10]
IO9	gpio[8]	pwm_ch[2]
IO10	gpio[12]	pwm_ch[0]	spi2_cs[1]
IO11	gpio[13]	pwm_ch[6]	spi2_mosi
IO12	gpio[14]		spi2_miso
IO13	gpio[15]		spi2_clk

I/O expander

The ARC HSDK4xD board includes a CY8C9520A I/O expander from Cypress CY8C9520A. The I/O expander offers additional GPIO signals and board control signals and can be accessed through the on-board I2C bus, we have implemented a basic driver for it. Tables below shows an overview of relevant I/O signals.

Pins	Usage
port0_bit0	RS9113 Bluetooth I2S RX enable (active low)
port0_bit1	mikroBUS Reset (active low)
port0_bit2	GPIO for Arduino AD0
port0_bit3	GPIO for Arduino AD1
port0_bit4	GPIO for Arduino AD2
port0_bit5	GPIO for Arduino AD3
port1_bit4	On-board user LED0
port1_bit5	On-board user LED1
port1_bit6	On-board user LED2
port1_bit7	On-board user LED3

On-board user LEDS

The ARC HSDK4xD includes 4 user LEDs(active high), which can be controlled through the I/O expander pins.

LEDs	PINs
LED0	GPX_port1_bit4
LED1	GPX_port1_bit5
LED2	GPX_port1_bit6
LED3	GPX_port1_bit7

For hardware feature details, refer to : Designware HS4x/HS4xD Development Kit website.

Programming and Debugging

Required Hardware and Software

To use Zephyr RTOS applications on the HS4x/HS4xD Development Kit board, a few additional pieces of hardware are required.

• A micro USB cable provides USB-JTAG debug and USB-UART communication to the board

• A universal switching power adaptor (110-240V AC to 12V DC), provided in the package, provides power to the board.

• The Zephyr SDK

• Terminal emulator software for use with the USB-UART. Suggestion: Putty Website.

• (optional) A collection of Pmods, Arduino modules, or Mikro modules. See Digilent Pmod Modules or develop your custom interfaces to attach to the Pmod connector.

Set up the ARC HS4x/HS4xD Development Kit

To run Zephyr application on ARC HS4x/HS4xD Development Kit, you need to set up the board correctly.

• Connect the digilent USB cable from your host to the board.

• Connect the 12V DC power supply to your board

Set up Zephyr Software

Building Sample Applications

You can try many of the sample applications and demos. We’ll use Hello World, found in samples/hello_world as an example.

Configuring

You may need to write a prj.conf file if the sample doesn’t have one. Next, you can use the menuconfig rule to configure the target. By specifying hsdk4xd as the board configuration, you can select the ARC HS4x/HS4xD Development Kit board support for Zephyr.

# From the root of the zephyr repository
west build -b hsdk4xd samples/hello_world
west build -t menuconfig

Building

You can build an application in the usual way. Refer to Building an Application for more details. Here is an example for Hello World.

# From the root of the zephyr repository
west build -b hsdk4xd samples/hello_world

Connecting Serial Output

In the default configuration, Zephyr’s HS4x/HS4xD Development Kit images support serial output via the USB-UART on the board. To enable serial output:

• Open a serial port emulator (i.e. on Linux minicom, putty, screen, etc)

• Specify the tty driver name, for example, on Linux this may be /dev/ttyUSB0

• Set the communication settings to:

Parameter	Value
Baud:	115200
Data:	8 bits
Parity:	None
Stopbits:	1

Debugging

Using the latest version of Zephyr SDK(>=0.15.2), you can debug and flash (run) HS4x/HS4xD Development Kit directly.

One option is to build and debug the application using the usual Zephyr build system commands.

west build -b hsdk4xd <my app>
west debug

At this point you can do your normal debug session. Set breakpoints and then c to continue into the program.

The other option is to launch a debug server, as follows.

west build -b hsdk4xd <my app>
west debugserver

Then connect to the debug server at the HS4x/HS4xD Development Kit from a second console, from the build directory containing the output zephyr.elf.

$ cd <my app>
$ $ZEPHYR_SDK_INSTALL_DIR/arc-zephyr-elf/arc-zephyr-elf-gdb zephyr.elf
(gdb) target remote localhost:3333
(gdb) load
(gdb) b main
(gdb) c

Flashing

If you just want to download the application to the HS4x/HS4xD Development Kit’s DDR and run, you can do so in the usual way.

west build -b hsdk4xd <my app>
west flash

This command still uses openocd and gdb to load the application elf file to HS4x/HS4xD Development Kit, but it will load the application and immediately run. If power is removed, the application will be lost since it wasn’t written to flash.

Most of the time you will not be flashing your program but will instead debug it using openocd and gdb. The program can be download via the USB cable into the code and data memories.

The HS4x/HS4xD Development Kit also supports flashing the Zephyr application with the U-Boot bootloader, a powerful and flexible tool for loading an executable from different sources and running it on the target platform.

The U-Boot implementation for the HS4x/HS4xD Development Kit was further extended with additional functionality that allows users to better manage the broad configurability of the HS4x/HS4xD Development Kit

When you are ready to deploy the program so that it boots up automatically on reset or power-up, you can follow the steps to place the program on SD card.

For details, see: Uboot-HS4x/HS4xD-Command-Reference

Supported peripheral

The following list indicates the state of HS4x/HS4xD Development Kit peripherals’ support

Peripheral	Support
ADC	No
Bluetooth	No
Ethernet	No
GPIO	No
GPU	No
HDMI	No
I2C	No
I2S	No
PWM	No
SDIO	No
SPI	No
UART	Yes
USB	No
WiFi	No

References