GigaDevice Semiconductor GD32EPRTV-START User manual

GigaDevice Semiconductor Inc.
GD32EPRTV-START
User Guide
V1.0

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Tables of Contents
TABLES OF CONTENTS ................................................................................................1
LIST OF FIGURES ..........................................................................................................3
LIST OF TABLES ............................................................................................................4
1. SUMMARY ................................................................................................................5
2. FUNCTION PIN ASSIGN...........................................................................................5
3. GETTING STARTED .................................................................................................5
4. HARDWARE LAYOUT OVERVIEW..........................................................................6
4.1. Power supply............................................................................................................... 6
4.2. Boot option .................................................................................................................. 6
4.3. LED............................................................................................................................... 6
4.4. KEY............................................................................................................................... 6
4.5. USART.......................................................................................................................... 7
4.6. USB............................................................................................................................... 7
4.7. Extension..................................................................................................................... 7
4.8. GD-Link ........................................................................................................................ 8
4.9. MCU.............................................................................................................................. 9
5. ROUTINE USE GUIDE............................................................................................10
5.1. GPIO_Running_LED.................................................................................................. 10
5.1.1. DEMO purpose..................................................................................................................... 10
5.1.2. DEMO running result ............................................................................................................ 10
5.2. GPIO_Key_Polling_mode.......................................................................................... 10
5.2.1. DEMO purpose..................................................................................................................... 10
5.2.2. DEMO running result ............................................................................................................ 10
5.3. EXTI_Key_Interrupt_mode........................................................................................ 11
5.3.1. DEMO purpose......................................................................................................................11
5.3.2. DEMO running result .............................................................................................................11
5.4. USART_HyperTerminal_Interrupt............................................................................. 11
5.4.1. DEMO purpose......................................................................................................................11
5.4.2. DEMO running result .............................................................................................................11
5.5. TIMER_Key_EXTI....................................................................................................... 12
5.5.1. DEMO purpose..................................................................................................................... 12
5.5.2. DEMO running result ............................................................................................................ 12
5.6. SQPI_PSRAM............................................................................................................. 12
5.6.1. DEMO purpose..................................................................................................................... 12
5.6.2. DEMO running result ............................................................................................................ 13
5.7. USBD_CDC_ACM ...................................................................................................... 13
5.7.1. DEMO purpose..................................................................................................................... 13

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5.7.2. DEMO running result ............................................................................................................ 13
6. REVISION HISTORY...............................................................................................15

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List of Figures
Figure 4-1. Schematic diagram of power supply...................................................................................... 6
Figure 4-2. Schematic diagram of boot option......................................................................................... 6
Figure 4-3. Schematic diagram of LED function ...................................................................................... 6
Figure 4-4. Schematic diagram of Key function....................................................................................... 6
Figure 4-5. Schematic diagram of USART ................................................................................................ 7
Figure 4-6. Schematic diagram of USB ..................................................................................................... 7
Figure 4-7. Schematic diagram of Extension............................................................................................ 7
Figure 4-8. Schematic diagram of GD-Link............................................................................................... 8
Figure 4-10. Schematic diagram of MCU................................................................................................... 9

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List of Tables
Table 2-1. Function pin assignment........................................................................................................... 5
Table 6-1. Revision history ....................................................................................................................... 15

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1. Summary
GD32EPRTV-START uses GD32EPRTVDT6 as the main controller. It uses GD-Link Mini
USB interface to supply 5V power. Reset, Boot, K2-User Key, LED, USB and USART to USB
interface are also included. For more details please refer to GD32EPRTV-START-Rev1.0
schematic.
2. Function Pin Assign
Table 2-1. Function pin assignment
Function
Pin
Description
LED
PC6
LED1
RESET
K1-Reset
KEY
PA0
User Key
USART
PB6
USART0_TX
PB7
USART0_RX
USB
PA11
USB_DM
PA12
USB_DP
PA9
USB Pull-up Control
3. Getting started
The START board uses GD-Link Mini USB connecter to get power DC +5V, which is the
hardware system normal work voltage. AGD-Link on board is necessary in order to download
and debug programs. Select the correct boot mode and then power on, the LEDPWR will turn
on, which indicates the power supply is OK.
There are Keil version and IAR version of all projects. Keil version of the projects are created
based on Keil MDK-ARM 5.26 uVision5. IAR version of the projects are created based on IAR
Embedded Workbench for ARM 8.32.1. During use, the following points should be noted:
1. If you use Keil uVision5 to open the project. In order to solve the "Device Missing (s)"
problem, you can install GigaDevice.GD32EPRT_DFP.1.1.0.pack.
2. If you use IAR to open the project, install IAR_GD32EPRT_ADDON_1.1.0.exe to load the
associated files.

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4. Hardware layout overview
4.1. Power supply
Figure 4-1. Schematic diagram of power supply
G
1
Vout 2
Vin
34
U2 AMS1117-3.3
E1
16V/10uF,AVX
E2
16V/10uF,AVX
GND
C11
50V/0.1uF
+3V3 LEDPWR
LED0603
R7
470Ω
P1
SMD1210P050F
+U5V +5V
4.2. Boot option
Figure 4-2. Schematic diagram of boot option
R4
10KΩ
1
2
3
JP3
BOOT0
GND
R5
10KΩ
1
2
3
JP4
BOOT1
GND
BOOT0
+3V3
+3V3
BOOT1
4.3. LED
Figure 4-3. Schematic diagram of LED function
PC6LED1
LED0603
LED
R10
470ΩGND
4.4. KEY
Figure 4-4. Schematic diagram of Key function
PA0
R11
10KΩ
+3V3
GND
C14
50V/0.1uF
KEY
K2
K-1102B

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4.5. USART
Figure 4-5. Schematic diagram of USART
VBUS 1
DM 2
DP 3
ID 4
GND 5
Shield 6
USB_MiniAB receptacle
CN3
Mini_USB
UD+
1
UD-
2
GND
3
RTS#
4
CTS#
5TNOW 6
VCC 7
TXD 8
RXD 9
V3 10
U3
CH340E
D+
D-
+3V3
+3V3
UART_TX
UART_RX PB6 PB7
C19
50V/0.01uF
C20
50V/0.1uF
D+
D-
C21
50V/4700pF
R17
1MΩ
USART To USB
4.6. USB
Figure 4-6. Schematic diagram of USB
USB
GND
R14 1.5KΩ
R12 22Ω
R13 22Ω
PA11
PA12
R15
1MΩ
C16
50V/4700pF
USB_DM
USB_DP
VBUS
1
DM
2
DP
3
ID
4
GND
5
Shield
6
USB_MiniAB receptacle
CN2
Mini_USB
PA9
4.7. Extension
Figure 4-7. Schematic diagram of Extension

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Extension Pin
PA4
PA5PA6
PA7
PB12 PB13
PB14 PB15
PB10 PB11
PA1
PB1PB0
PA3PA2
PE14
PC5
PD8
PD10 PD11
PD12
PE15
PE9PE8PE11PE10
PE12 PE13
PC1
PC2PC3
PD13
PD14
PC4
PD15
PE7PB5
PB6PB7
PA10
PB8PB9
PA15
PB3
PA13 PA14
PB4
PA8
PE0
PD0
PD1
PD3PD4
PD5PD6
PC10 PC11
PC12
PC7PC8PC9
PD2
PE1
PE2PE3
PE4PE5
PE6
PD7
+3V3 GND
PC0PC13
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
JP5
HEADER 20X2
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
JP6
HEADER 20X2
+3V3 GND+5V
PD9
4.8. GD-Link
Figure 4-8. Schematic diagram of GD-Link
L_USB_Ctr
C100
50V/20pF
C102
50V/20pF
Y101
49S-8MHz
GND L_NRST
+3V3
GND
R102
10KΩ
C103
50V/0.1uF
R104
10KΩ
GND
C105
50V/0.1uF
C106
50V/0.1uF
C107
50V/0.1uF
C108
50V/0.1uF
R101
1MΩ
L_OSC_IN
L_OSC_OUT
L_OSC_IN
L_OSC_OUT L_NRST
GND
+3V3
GND
1
2
3
4
JP100
4×1P2.54
+3V3
GND
MCU SWD
Reset
L_TMS/IO
L_TDI
L_TDO/SWO
L_TCK/CLK
L_USB_DP
L_SWDIO
L_SWDCK
L_SWDIO
L_SWDCK
+3V3
L_USB_DM
BOOT0
44
NRST
7
OSC_IN/PD0
5
OSC_OUT/PD1
6
PA0-WKUP
10
PA1
11
PA2
12
PA3
13
PA4
14
PA5
15
PA6
16
PA7
17
PA8
29
PA9
30
PA10
31
PA11
32
PA12
33
PA13/JTMS/SWDIO
34
PA14/JTCK/SWCLK
37
PA15/JTDI
38
PB018
PB119
PB2/BOOT1 20
PB3/JTDO 39
PB4/JNTRST 40
PB541
PB642
PB743
PB845
PB946
PB10 21
PB11 22
PB12 25
PB13 26
PB14 27
PB15 28
PC13-TAMPER-RTC 2
PC14-OSC32_IN 3
PC15-OSC32_OUT 4
VBAT
1
VDD_1
24
VDD_2
36
VDD_3
48
VDDA
9
VSS_1 23
VSS_2 35
VSS_3 47
VSSA 8
U0
GD32F103C8T6
L_TReset
R103
10KΩGND
GND
R105 22Ω
R106 22Ω
R108
1MΩC104
50V/4700pF
L_USB_DM
L_USB_DP
GND
R107 1.5KΩL_USB_Ctr
VCC 1
D- 2
D+ 3
ID 4
GND 5
SHELL 6
CN100
Mini_USB
+U5V
L_LED1
L_LED2
L_LED1
LED0603
L_LED2
LED0603
R109 470Ω
R110 470Ω
GND

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4.9. MCU
Figure 4-9. Schematic diagram of MCU
BOOT0
94
NC
73
NRST
14
OSC_IN
12
OSC_OUT
13
PA0-WKUP
23
PA1
24
PA2
25
PA3
26
PA4
29
PA5
30
PA6
31
PA7
32
PA8
67
PA9
68
PA10
69
PA11
70
PA12
71
PA13/JTMS/SWDIO
72
PA14/JTCK/SWCLK
76
PA15/JTDI
77
PB0
35
PB1
36
PB2/BOOT1
37
PB3/JTDO
89
PB4/JNTRST
90
PB5
91
PB6
92
PB7
93
PB8
95
PB9
96
PB10
47
PB11
48
PB12
51
PB13
52
PB14
53
PB15
54
PC015
PC116
PC217
PC318
PC433
PC534
PC663
PC764
PC865
PC966
PC10 78
PC11 79
PC12 80
PC13-TAMPER-RTC 7
PC14-OSC32_IN 8
PC15-OSC32_OUT 9
PD081
PD182
PD283
PD384
PD485
PD586
PD687
PD788
PD855
PD956
PD10 57
PD11 58
PD12 59
PD13 60
PD14 61
PD15 62
PE097
PE198
PE21
PE32
PE43
PE54
PE65
PE738
PE839
PE940
PE10 41
PE11 42
PE12 43
PE13 44
PE14 45
PE15 46
VDD_1
50
VDD_2
75
VDD_3
100
VDD_4
28
VDD_5
11
VDDA
22
VREF-
20
VREF+
21
VSS_1 49
VSS_2 74
VSS_3 99
VSS_4 27
VSS_5 10
VSSA 19
VBAT
6
U1
GD32EPRTVDT6
PA4
PA5
PA6
PA7
PA0
PA1
PA3
PA2
PA11
PA12
PA9
PA10
PA8
PB5
PB6
PB7
PB1
BOOT1
PB0
PB12
PB13
PB14
PB15
PB10
PB11
PB8
PB9
PC4
PC5
PC6
PC7
PC0
PC1
PC3
PC2
PC12
PC13
PC8
PC9
PC11
PC10
PD0
PD1
PD3
PD4
PD5
PD6
PD2
PD7
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE14
PE15
PE9
PE8
PE11
PE10
PE12
PE13
C8
50V/20pF
C9
50V/20pF
Y2
49S-8MHz
GND
NRST
K1
K-1102B
+3V3
GND
R6
10KΩ
C10
50V/0.1uF
BOOT0
GND
C6
50V/10pF
C7
50V/10pF
Y1
32.768KHz
C1
50V/0.1uF
C2
50V/0.1uF
C3
50V/0.1uF
C4
50V/0.1uF
C5
50V/0.1uF
R3
1MΩ
JTMS/SWDIO
JTCK/SWDCLK
OSC32_IN
OSC32_OUT
OSC_IN
OSC_OUT
NC
GND
GND
+3V3
+3V3
NRST
JTMS/SWDIO
JTCK/SWDCLK
PA13
PA14 PA15
PB2PB3
PB4
L_TMS/IO
L_TCK/CLK
L_TReset
GDLink
NRST
SWD
C12
50V/0.1uF
C13
50V/0.1uF
+3V3+3V3
C15
50V/0.01uF C17
50V/0.01uF
+3V3
1
2
3
4
JP1
4×1P2.54
+3V3
GND
SWD

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5. Routine use guide
5.1. GPIO_Running_LED
5.1.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED
Learn to use SysTick to generate 1ms delay
GD32EPRTV-START-V1.0 board has 2 keys and 1 LED. The keys are User Key and Reset
Key. The LED is controlled by GPIO.
This demo will show how to light the LED.
5.1.2. DEMO running result
Download the program < 01_GPIO_Running_LED > to the START board, LED can light
cycles.
5.2. GPIO_Key_Polling_mode
5.2.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use SysTick to generate 1ms delay
GD32EPRTV-START-V1.0 board has 2 keys and 1 LED. The keys are User Key and Reset
Key. The LED are controlled by GPIO.
This demo will show how to use the User Key to control the LED1. When press down the User
Key, it will check the input value of the IO port. If the value is 0 and will wait for 100ms. Check
the input value of the IO port again. If the value still is 0, it indicates that the button is pressed
successfully and toggle LED1.
5.2.2. DEMO running result
Download the program < 02_GPIO_Key_Polling_mode > to the START board, press down
the User Key, LED1 will be turned on. Press down the User Key again, LED1 will be turned
off.

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5.3. EXTI_Key_Interrupt_mode
5.3.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use EXTI to generate external interrupt
GD32EPRTV-START-V1.0 board has 2 keys and 1 LED. The keys are User Key and Reset
Key. The LED is controlled by GPIO.
This demo will show how to use the EXTI interrupt line to control the LED1. When press down
the User Key, it will produce an interrupt. In the interrupt service function, the demo will toggle
LED1.
5.3.2. DEMO running result
Download the program < 03_EXTI_Key_Interrupt_mode > to the START board, LED1 is
turned on and off for test. When press down the User Key, LED1 will be turned on. Press
down the User Key again, LED1 will be turned off.
5.4. USART_HyperTerminal_Interrupt
5.4.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use the USART transmit and receive interrupts to communicate with the
HyperTerminal.
5.4.2. DEMO running result
Download the program <04_USART_HyperTerminal_Interrupt> to the START board, connect
serial cable to USART. Firstly, the LED1 flash 2 times for test. Then, the USART sends the
tx_buffer array (from 0x00 to 0xFF) to the hyperterminal and waits for receiving data from the
hyperterminal that you must send. The string that you have sent is stored in the rx_buffer
array. The receive buffer have a BUFFER_SIZE bytes as maximum. After that, compare
tx_buffer with rx_buffer. If tx_buffer is same with rx_buffer, LED1 flash. Otherwise, LED1 on.
The output information via the HyperTerminal is as following:

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5.5. TIMER_Key_EXTI
5.5.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use EXTI to generate external interrupt
Learn to use TIMER to generate PWM
GD32EPRTV-START-V1.0 board has 2 keys and 1 LED. The keys are User Key and Reset
Key. The LED is controlled by GPIO.
This demo will show how to use the TIMER PWM to trigger EXTI interrupt to toggle the state
of LED1 and EXTI interrupt line to control the LED1. When press down the User Key, it will
produce an interrupt. In the interrupt service function, the demo will toggle LED1.
5.5.2. DEMO running result
Download the program < 05_TIMER_Key_EXTI > to the START board, the LED1 is flashed
once for test, press down the User Key, LED1 will be turned on. Press down the User Key
again, LED1 will be turned off. Connect PA6 (TIMER2_CH0) and PA4 with DuPont line. The
LED1 will be toggled every 500ms.
5.6. SQPI_PSRAM
5.6.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use the SQPI unit to read and write PSRAM with the SQPI interface

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5.6.2. DEMO running result
The computer serial port line connected to the USART port of START board, set the baud rate
of HyperTerminal software to 115200, 8 bits data bit, 1 bit stop bit.
Download the program <06_SQPI_PSRAM> to the START board, the HyperTerminal
software can observe the operation condition, 256 bytes data which are written to and read
from PSRAM. Compare the data that were written to the PSRAM and the data that were read
from the PSRAM. If they are the same, the serial port will output “SQPI read and write
operation success”, otherwise, the serial port will output “SQPI read and write operation error”.
5.7. USBD_CDC_ACM
5.7.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn how to use the USBD peripheral
Learn how to implement USB CDC device
GD32EPRTV-START-V1.0 board has one USBD interface. In this demo, the GD32EPRTV-
START-V1.0 board is enumerated as an USB virtual COM port, which was shown in device
manager of PC as below. This demo makes the USB device look like a serial port, and loops
back the contents of a text file over USB port. To run the demo, input a message using the
PC's keyboard. Any data that shows in HyperTerminal is received from the device.
5.7.2. DEMO running result
Download the program <07_USBD_CDC_ACM> to the board and run. When you input
message through computer keyboard, the HyperTerminal will receive and shown the message.
For example, when you input “GigaDevice MCU”, the HyperTerminal will get and show it as
below.

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6. Revision history
Table 6-1. Revision history
Revision No.
Description
Date
1.0
Initial Release
Sep.4, 2020

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