GigaDevice Semiconductor GD32103B-EVAL User manual

GigaDevice Semiconductor Inc.
GD32103B-EVAL
User Guide
V2.1

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Table of Contents
Table of Contents.............................................................................................................................. 1
List of Tables..................................................................................................................................... 3
1Summary.................................................................................................................................... 4
2Function Pin Assign.................................................................................................................. 4
3Getting started........................................................................................................................... 6
4Hardware layout overview........................................................................................................ 7
4.1 Power................................................................................................................................... 7
4.2 Boot...................................................................................................................................... 7
4.3 LED....................................................................................................................................... 8
4.4 KEY...................................................................................................................................... 8
4.5 BEEP.................................................................................................................................... 8
4.6 USART................................................................................................................................. 9
4.7 ADC...................................................................................................................................... 9
4.8 I2C...................................................................................................................................... 10
4.9 SPI...................................................................................................................................... 10
4.10 CAN.................................................................................................................................... 10
4.11 SRAM..................................................................................................................................11
4.12 LCD.................................................................................................................................... 12
4.13 USBD ................................................................................................................................. 12
4.14 Extension............................................................................................................................ 13
4.15 GD-Link.............................................................................................................................. 13
5Routine use guide ................................................................................................................... 14
5.1 GPIO_Runing_Led............................................................................................................. 14
5.2 GPIO_Key_Polling_mode.................................................................................................. 14
5.3 EXTI_Key_Interrupt_mode ................................................................................................ 15
5.4 USART_Printf..................................................................................................................... 15
5.5 USART_HyperTerminal_Interrupt...................................................................................... 16
5.6 USART_Hardware_Flow_Control...................................................................................... 16
5.7ADC_Temperature_Vrefint................................................................................................. 17
5.8 ADC0_ADC1_Follow_up_mode ........................................................................................ 18
5.9 ADC0_ADC1_Regular_Parallel_mode.............................................................................. 19
5.10 I2C_EEPROM.................................................................................................................... 20
5.11 SPI_SPI_Flash................................................................................................................... 21
5.12 EXMC_SRAM..................................................................................................................... 22
5.13 EXMC_TouchScreen.......................................................................................................... 23
5.14 CAN_Network..................................................................................................................... 24
5.15 RCU_Clock_Out................................................................................................................. 25
5.16 PMU_sleep_wakeup.......................................................................................................... 25
5.17 RTC_Calendar ................................................................................................................... 26
5.18 TIMER_Breath_LED .......................................................................................................... 27
5.19 USBD_Keyboard................................................................................................................ 27

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5.20 USBD_CDC_ACM ............................................................................................................. 28
6Revision history....................................................................................................................... 30

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List of Tables
Table 1. Function pin assign.......................................................................................................................... 4
Table 2. Revision history.............................................................................................................................. 30

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1 Summary
GD32103B-EVAL uses GD32F103VBT6 as the main controller. It uses Mini USB interface to
supply 5V power. SWD, Reset, Boot, User button key, LED, CAN, I2C, USART, RTC, LCD,
SPI, ADC, EXMC, USBD, GD-Link and Extension Pins are also included. For more details
please refer to GD32103B-EVAL-V1.2 schematic.
2 Function Pin Assign
Table 1. Function pin assign
Function
Pin
Description
LED
PC6
LED2
PC7
LED3
PC8
LED4
PC9
LED5
RESET
K1-Reset
KEY
PA0
K2-Wakeup
PB9
K3-User key
PC13
K4-Tamper
BEEP
PB8
BEEP_CTL
USART0
PA9
USART0_TX
PA10
USART0_RX
USART1
PD5
USART1_TX
PD6
USART1_RX
PD3
USART1_CTS
PD4
USART1_RTS
ADC
PC4
ADC01_IN14
I2C
PB6
I2C0_SCL
PB7
I2C0_SDA
SPI
PA5
SPI0_SCK
PA6
SPI0_MISO
PA7
SPI0_MOSI
PA4
SPI0_CS
CAN
PD0
CAN0_RX
PD1
CAN0_TX
SRAM
PD14
EXMC_D0
PD15
EXMC_D1
PD0
EXMC_D2
PD1
EXMC_D3
PE7
EXMC_D4
PE8
EXMC_D5

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PE9
EXMC_D6
PE10
EXMC_D7
PE11
EXMC_D8
PE12
EXMC_D9
PE13
EXMC_D10
PE14
EXMC_D11
PE15
EXMC_D12
PD8
EXMC_D13
PD9
EXMC_D14
PD10
EXMC_D15
PD11
EXMC_A16
PD12
EXMC_A17
PD13
EXMC_A18
PD4
EXMC_NOE
PD5
EXMC_NWE
PD7
EXMC_NE0
PE0
EXMC_NBL0
PE1
EXMC_NBL1
PB7
EXMC_NADV
LCD
PD14
EXMC_D0
PD15
EXMC_D1
PD0
EXMC_D2
PD1
EXMC_D3
PE7
EXMC_D4
PE8
EXMC_D5
PE9
EXMC_D6
PE10
EXMC_D7
PE11
EXMC_D8
PE12
EXMC_D9
PE13
EXMC_D10
PE14
EXMC_D11
PE15
EXMC_D12
PD8
EXMC_D13
PD9
EXMC_D14
PD10
EXMC_D15
PE2
EXMC_A23
PD4
EXMC_NOE
PD5
EXMC_NWE
PD7
EXMC_NE0
USBD
PA11
USB_DM
PA12
USB_DP

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3 Getting started
The EVAL board uses Mini USB connecter to get power DC +5V, which is the hardware
system normal work voltage. A J-Link tool or GD-Link on board is necessary in order to
download and debug programs. Select the correct boot mode and then power on, the LED1
will turn on, which indicates that 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 4.74 uVision4. IAR version of the projects are created based on IAR
Embedded Workbench for ARM 7.40.2. During use, the following points should be noted:
1. If you use Keil uVision4 to open the project, install the GD32F10x_AddOn.2.0.0.exe to load
the associated files.
2. If you use Keil uVision5 to open the project, there are two ways to solve the "Device Missing
(s)" problem. One is to install GigaDevice.GD32F10x_DFP.2.0.1.pack. In Project menu, select
the Manage sub menu, click on the “Version Migrate 5 Format...” menu, the Keil uVision4
project will be converted to Keil uVision5 project. Then add
“C:\Keil_v5\ARM\Pack\ARM\CMSIS\4.2.0\CMSIS\Include” to C/C++ in Option for Target. The
other is to install Addon directly. Select the installation directory of Keil uVision5 software,
such as C:\Keil_v5, in Destination Folder of Folder Selection. Select the corresponding device
in Device of Option for Target and add
“C:\Keil_v5\ARM\Pack\ARM\CMSIS\4.2.0\CMSIS\Include” to C/C++ in Option for Target.
3. If you use IAR to open the project, install IAR_GD32F10x_ADDON.2.0.0.exe to load the
associated files.

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4 Hardware layout overview
4.1 Power
G
1
Vout 2
Vin
34
U3 AMS1117-3.3
E1
16V/10uF,AVX
E2
16V/10uF,AVX
GND
C12
50V/0.1uF
C13
50V/0.1uF
+3V3
R10
0Ω
GND
VDDA
VSSA
C14
50V/0.1uF
VREF+
VREF-
C15
50V/0.1uF
LED1
LED0603
R9
470Ω
R11
0Ω
GND
+U5V
+3V3+3V3 L2
EBLS1608-3R3K
L1
EBLS1608-3R3K
P1
SMD1210P005TF
4.2 Boot
R6
10KΩ
1
2
3
JP3
BOOT0
GND
R7
10KΩ
1
2
3
JP4
BOOT1
GND
BOOT0
+3V3
+3V3
BOOT1
BOOT1
BOOT0
Boot Mode
Any
2-3
User memory
2-3
1-2
System memory
1-2
1-2
SRAM memory

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4.3 LED
PC6
PC7
PC8
PC9
LED2
LED0603
LED3
LED0603
LED4
LED0603
LED5
LED0603
LED
R28
680Ω
R29
680Ω
R30
680Ω
R31
680Ω
GND
4.4 KEY
PA0
R32
10KΩ
+3V3
GND
C34
50V/0.1uF
PC13
R34
10KΩ
+3V3
GND
C36
50V/0.1uF
PB9
R33
10KΩ
+3V3
GND
C35
50V/0.1uF
KEY
K2
K-1102B
K3
K-1102B
K4
K-1102B
4.5 BEEP
BZ1
BUZZER-5V
+U5V
1
2 3
Q1
8050
GND
R26
1KΩ
R27
10KΩ
PB8

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4.6 USART
C1+
1V+ 2
C1-
3
C2+
4
C2-
5
V- 6
T2OUT 7
R2IN 8
R2OUT
9
T2IN
10 T1IN
11
R1OUT
12 R1IN 13
T1OUT 14
GND
15 VCC 16
U5
MAX3232CSE+
+3V3
GND
C1950V/0.1uF
C2250V/0.1uF
C21
50V/0.1uF
C18
50V/0.1uF C17 50V/0.1uF
GND 1
6
2
7
3
8
4
9
5
J1
COM2
GND
C1+
1V+ 2
C1-
3
C2+
4
C2-
5
V- 6
T2OUT 7
R2IN 8
R2OUT
9
T2IN
10 T1IN
11
R1OUT
12 R1IN 13
T1OUT 14
GND
15 VCC 16
U6
MAX3232CSE+
+3V3
GND
C2550V/0.1uF
C2750V/0.1uF C26
50V/0.1uF
C24 50V/0.1uF C23 50V/0.1uF
GND 1
6
2
7
3
8
4
9
5
J2
COM1
GND
USART1
USART0
PA9
PA10
RS232_TX0
RS232_RX0
USART1_TX
PD6
USART1_RTS
PD3
RS232_TX1
RS232_RX1
RS232_RTS1
RS232_CTS1
4.7 ADC
+3V3
GND
ADC
C33
50V/0.1uF
R25
1KΩ
PC4 VR1
10K
1
TP2
TP ADin

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4.8 I2C
PB6
I2C_SDA
A0
1
A1
2
A2
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U1
AT24C02C-SSHM-T
+3V3
GND
R1
4.7KΩ
R2
4.7KΩ
I2C
C1
50V/0.1uF GND
PB7
4.9 SPI
PA4
PA6PA5
PA7
CS
1
SO
2
WP
3
GND
4SI 5
SCLK 6
HOLD 7
VCC 8
U4
GD25Q16
+3V3
GND
SPI Flash
R12
10KΩ
+3V3 C16
50V/0.1uF
GND
+3V3
4.10 CAN
D
1
GND
2
VCC
3
R
4Vref 5
CANL 6
CANH 7
RS 8
U9
SN65HVD230
CANH
CANL
R23 0Ω
GND
R24
120Ω1
2
JP6
HEADER 2
CAN_TX
CAN_RX GND
+3V3 C32
50V/0.1uF
GND CAN

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4.11 SRAM
EXMC_A18
EXMC_A17
EXMC_A16
EXMC_A15
EXMC_A14
EXMC_A13
EXMC_A12
EXMC_A11
EXMC_A10
EXMC_A9
EXMC_A8
EXMC_A7
EXMC_A6
EXMC_A5
EXMC_A4
EXMC_A3
EXMC_A2
EXMC_A1
EXMC_A0
EXMC_NE0_SRAM
EXMC_NWE
EXMC_NOE
EXMC_NBL0
EXMC_NBL1
C37
50V/0.1uF
C38
50V/0.1uF
+3V3
GND
R35
10KΩ
+3V3
A18
28
A17
44
A16
43
A15
42
A14
27
A13
26
A12
25
A11
24
A10
23
A9
22
A8
21
A7
20
A6
19
A5
18
A4
5
A3
4
A2
3
A1
2
A0
1
CE
6
WE
17
OE
41
LB
39
UB
40 VSS2 34
VSS1 12
VDD2 33
VDD1 11
IO15 38
IO14 37
IO13 36
IO12 35
IO11 32
IO10 31
IO9 30
IO8 29
IO7 16
IO6 15
IO5 14
IO4 13
IO3 10
IO2 9
IO1 8
IO0 7
U11
IS61LV51216
EXMC_AD15
EXMC_AD14
EXMC_AD13
EXMC_AD12
EXMC_AD11
EXMC_AD10
EXMC_AD9
EXMC_AD8
EXMC_AD7
EXMC_AD6
EXMC_AD5
EXMC_AD4
EXMC_AD3
EXMC_AD2
EXMC_AD1
EXMC_AD0
SRAM
CRL
1
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
98D
8
G
10
Enable 11
8Q 12
7Q 13
6Q 14
5Q 16
4Q 15
3Q 17
2Q 18
VCC 20
1Q 19
U13
MM74HC573N
CRL
1
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
98D
8
G
10
Enable 11
8Q 12
7Q 13
6Q 14
5Q 16
4Q 15
3Q 17
2Q 18
VCC 20
1Q 19
U12
MM74HC573N
GND
+3V3 +3V3
GND
+3V3
GND
EXMC_NADV
EXMC_AD0
EXMC_AD1
EXMC_AD2
EXMC_AD3
EXMC_AD4
EXMC_AD5
EXMC_AD6
EXMC_AD7
EXMC_AD8
EXMC_AD9
EXMC_AD10
EXMC_AD11
EXMC_AD12
EXMC_AD13
EXMC_AD14
EXMC_AD15
EXMC_A0
EXMC_A1
EXMC_A2
EXMC_A3
EXMC_A4
EXMC_A5
EXMC_A6
EXMC_A7
EXMC_A8
EXMC_A9
EXMC_A10
EXMC_A11
EXMC_A12
EXMC_A13
EXMC_A14
EXMC_A15
GND GND
Enable Enable
Enable
+3V3
C41
50V/0.1uF
GND
C42
50V/0.1uF
C43
50V/0.1uF
PD7
EXMC_NE0_SRAM
EXMC_NE0_LCD
EXMC_AD0
EXMC_AD1
EXMC_AD2 EXMC_AD3
EXMC_AD4
EXMC_AD5
EXMC_AD6
EXMC_AD7
EXMC_AD8
EXMC_AD9
EXMC_AD10
EXMC_AD11
EXMC_AD12
EXMC_AD13
EXMC_AD14
EXMC_AD15
EXMC_A18
EXMC_A17
EXMC_A16
EXMC_NWEEXMC_NOE
EXMC_NBL0
EXMC_NBL1
PD14
PD15
PD0 PD1
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
PD8
PD9
PD10
PD11
PD12
PD13
PD4 PD5
PE0
PE1
3 5
2 4
U14
SN74AHC1G04DCK
1
2
3
JP12
HEADER 3
1
2
3
JP13
HEADER 3
USART1_TXUSART1_RTS
1
2
3
JP11
HEADER 3
1
2
3
JP15
HEADER 3
1
2
3
JP14
HEADER 3
CAN_RX CAN_TX PB7
1
2
3
JP10
HEADER 3
EXMC_NADV
I2C_SDA

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4.12 LCD
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
JP9
LCD
+3V3 GND
EXMC_AD0 EXMC_AD1
EXMC_AD2
EXMC_AD4
EXMC_AD6
EXMC_AD8
EXMC_AD10
EXMC_AD12
EXMC_AD3
EXMC_AD5
EXMC_AD7
EXMC_AD9
EXMC_AD11
EXMC_AD13
EXMC_AD15
EXMC_A23
EXMC_NOE
EXMC_AD14
EXMC_NE0_LCD
EXMC_NWE
NRST
LCD
+3V3
CRL
1
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
98D
8
G
10
Enable 11
8Q 12
7Q 13
6Q 14
5Q 16
4Q 15
3Q 17
2Q 18
VCC 20
1Q 19
U13
MM74HC573N
CRL
1
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
98D
8
G
10
Enable 11
8Q 12
7Q 13
6Q 14
5Q 16
4Q 15
3Q 17
2Q 18
VCC 20
1Q 19
U12
MM74HC573N
GND
+3V3 +3V3
GND
+3V3
GND
EXMC_NADV
EXMC_AD0
EXMC_AD1
EXMC_AD2
EXMC_AD3
EXMC_AD4
EXMC_AD5
EXMC_AD6
EXMC_AD7
EXMC_AD8
EXMC_AD9
EXMC_AD10
EXMC_AD11
EXMC_AD12
EXMC_AD13
EXMC_AD14
EXMC_AD15
EXMC_A0
EXMC_A1
EXMC_A2
EXMC_A3
EXMC_A4
EXMC_A5
EXMC_A6
EXMC_A7
EXMC_A8
EXMC_A9
EXMC_A10
EXMC_A11
EXMC_A12
EXMC_A13
EXMC_A14
EXMC_A15
GND GND
Enable Enable
Enable
+3V3
C41
50V/0.1uF
GND
C42
50V/0.1uF
C43
50V/0.1uF
PD7
EXMC_NE0_SRAM
EXMC_NE0_LCD
EXMC_AD0
EXMC_AD1
EXMC_AD2 EXMC_AD3
EXMC_AD4
EXMC_AD5
EXMC_AD6
EXMC_AD7
EXMC_AD8
EXMC_AD9
EXMC_AD10
EXMC_AD11
EXMC_AD12
EXMC_AD13
EXMC_AD14
EXMC_AD15
EXMC_A23
EXMC_NWEEXMC_NOE
PD14
PD15
PD0 PD1
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
PD8
PD9
PD10
PE2
PD4 PD5
BackLight
3 5
2 4
U14
SN74AHC1G04DCK
PA6
PA7
PA5
PC5
SPI1_MISO
SPI1_MOSI
SPI_SCK
TP_CS
TP_INT
R40
10KΩ
+3V3
PB0
1
2
3
JP12
HEADER 3
1
2
3
JP13
HEADER 3
USART1_TXUSART1_RTS
1
2
3
JP11
HEADER 3
1
2
3
JP15
HEADER 3
1
2
3
JP14
HEADER 3
CAN_RX CAN_TX PB7
1
2
3
JP10
HEADER 3
EXMC_NADV
I2C_SDA
4.13 USBD
+U5V PA11
PA12
USB
R19 22Ω
R20 22Ω
USB_DM
USB_DP
R21 1.5KΩ
R22 1MΩ
C31
50V/4700pF
PC0
VBUS 1
DM 2
DP 3
ID 4
GND 5
Shield 6
USB_MiniAB receptacle
CN3
Mini_USB
GND

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4.14 Extension
Extension Pin
PA4 PA5
PA6 PA7
PB12PB13 PB14PB15
PB10 PB11
PA0
PA1
PB1
PB2
PB0
PA3 PA2
PE14
PC5
PD8
PD9 PD10
PD11 PD12
PE15
PE9 PE8
PE11 PE10
PE12
PE13
PC1 PC2
PC3
PD13 PD14
PC4
PD15
PE7
+3V3
PB5
PB6PB7
PA11PA12 PA9PA10
PB8PB9
PA15
PB3
PA13
PA14
PB4
PA8
PE0
PD0
PD1
PD3
PD4 PD5
PD6
PC10 PC11
PC12
PC6 PC7PC8 PC9
PD2
PE1 PE2
PE3PE4 PE5PE6
PD7
PC13
+3V3
+3V3
1 2
3 4
5 6
7 8
9 10
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
41
43
45
47
49
42
44
46
48
50
JP7
25x2P2.54
1 2
3 4
5 6
7 8
9 10
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
41
43
45
47
49
42
44
46
48
50
JP8
25x2P2.54
GND
GND
GND
GND
GND
GND GND
GND
GNDGND
GND
GND
GND
PC0
GND
GND GND
4.15 GD-Link
L_USB_Ctr
C100
50V/20pF
C102
50V/20pF
Y101
HC-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
C109
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
L_LED1
L_LED2
L_LED1 LED0603
L_LED2 LED0603
R103
10KΩGND
R109 1KΩ
R110 1KΩGND
GND
R105 22R
R106 22R
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

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5 Routine use guide
5.1 GPIO_Runing_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
GD32103B-EVAL board has four LEDs. The LED2, LED3, LED4 and LED5 are controlled by
GPIO. This demo will show how to light the LEDs.
5.1.2 DEMO Running Result
Download the program <01_GPIO_Runing_Led> to the EVAL board, LED2, LED3, LED4,
LED5 will turn on in sequence with interval of 200ms, and turn off together, 200ms later, repeat
the process.
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
GD32103B-EVAL board has four keys and four LEDs. The four keys are Reset key, Tamper
key, Wakeup key and User key. The LED2, LED3, LED4 and LED5 are controlled by GPIO.
This demo will show how to use the Tamper key to control the LED2. When press down the
Tamper 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 LED2.
5.2.2 DEMO Running Result
Download the program <02_GPIO_Key_Polling_mode> to the EVAL board, press down the
Tamper Key, LED2 will be turned on. Press down the Tamper Key again, LED2 will be turned

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off.
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
GD32103B-EVAL board has four keys and four LEDs. The four keys are Reset key, Tamper
key, Wakeup key and User key. The LED2, LED3, LED4 and LED5 are controlled by GPIO.
This demo will show how to use the EXTI interrupt line to control the LED2.When press down
the Tamper Key, it will produce an interrupt. In the interrupt service function, the demo will
toggle LED2.
5.3.2 DEMO Running Result
Download the program <03_EXTI_Key_Interrupt_mode> to the EVAL board, Press down the
Tamper Key, LED2 will be turned on. Press down the Tamper Key again, LED2 will be turned
off.
5.4 USART_Printf
5.4.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED
Learn to retarget the C library printf function to the USART
5.4.2 DEMO Running Result
Download the program < 04_USART_Printf > to the EVAL board, connect serial cable to
EVAL_COM0. This implementation outputs “USART printf example: please press the Tamper
key” on the HyperTerminal using EVAL_COM0. Press the Tamper key, serial port will output
“USART printf example”.
The output information via the serial port is as following.

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5.5 USART_HyperTerminal_Interrupt
5.5.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the USART transmit and receive interrupts to communicate with the serial
terminal tool
5.5.2 DEMO Running Result
Download the program < 05_USART_HyperTerminal_Interrupt > to the EVAL board, connect
serial cable to EVAL_COM0. Firstly, all the LEDs are turned on and off for test. Then, the
EVAL_COM0 sends the tx_buffer array (from 0x00 to 0xFF) to the serial terminal tool
supporting hex format communication and waits for receiving data of BUFFER_SIZE bytes
from the serial terminal. The data MCU has received is stored in the rx_buffer array. After that,
compare tx_buffer with rx_buffer. If tx_buffer is same with rx_buffer, LED2, LED3, LED4,
LED5 flash by turns. Otherwise, LED2, LED3, LED4, LED5 toggle together.
The output information via the serial port is as following.
5.6 USART_Hardware_Flow_Control
5.6.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the USART transmit and receive data using hardware flow control

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5.6.2 DEMO Running Result
Download the program < 06_USART_HardwareFlowControl > to the EVAL board, connect
serial cable to EVAL_COM2. Firstly, all the LEDs are turned on and off for test. Then, the
EVAL_COM2 sends the string “USART Hyperterminal Hardware Flow Control Example:
USART- Hyperterminal communication using hardware flow control” to the serial terminal tool
which supporting string format communication and opening CTS and RTS function. Then the
MCU waits for receiving data from the serial terminal. The data can be any string ended with
carriage return. After that, MCU sends the received string back to the serial terminal and prints
it.
The output information via the serial port is as following.
5.7 ADC_Temperature_Vrefint
5.7.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the ADC to convert analog signal to digital data
Learn to get the value of inner channel 16(temperature sensor channel) and channel 17
(VREFINT channel)
5.7.2 DEMO Running Result
Download the program <07_ADC_Temperature_Vrefint> to the GD32103B-EVAL board.
Connect serial cable to EVAL_COM0, open the HyperTerminal.
When the program is running, HyperTerminal display the value of temperature and internal
voltage reference (VREFINT).
Notice: because there is an offset, when inner temperature sensor is used to detect accurate
temperature, an external temperature sensor part should be used to calibrate the offset error.

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5.8 ADC0_ADC1_Follow_up_mode
5.8.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the ADC to convert analog signal to digital data
Learn to use ADC0 and ADC1 follow-up mode
5.8.2 DEMO Running Result
Download the program <08_ADC0_ADC1_Follow_up_mode> to the GD32103B-EVAL board.
Connect serial cable to EVAL_COM0, open the HyperTerminal. PC4 and PC5 pin voltage
access by external voltage.
TIMER0_CH0 is the trigger source of ADC0 and ADC1. When the rising edge of
TIMER0_CH0 coming, ADC0 starts immediately and ADC1 starts after a delay of several
ADC clock cycles. The values of ADC0 and ADC1 are transmitted to array adc_value[0] and
adc_value[1] by DMA.
When the first rising edge of TIMER0_CH0 coming, the value of the ADC0 conversion of PC4
pin is stored into the low half word of adc_value[0], and after a delay of several ADC clock
cycles the value of the ADC1 conversion of PC5 pin is stored into the high half word of
adc_value[0]. When the second rising edge of TIMER0_CH0 coming, the value of the ADC0
conversion of PC5 pin is stored into the low half word of adc_value[1], and after a delay of
several ADC clock cycles the value of the ADC1 conversion of PC4 pin is stored into the high
half word of adc_value[1].
When the program is running, HyperTerminal display the regular value of ADC0 and ADC1
by adc_value[0] and adc_value[1].

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5.9 ADC0_ADC1_Regular_Parallel_mode
5.9.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the ADC to convert analog signal to digital data
Learn to use ADC0 and ADC1 regular parallel mode
5.9.2 DEMO Running Result
Download the program <09_ADC0_ADC1_Regular_Parallel_mode> to the GD32103B-EVAL
board. Connect serial cable to EVAL_COM0, open the HyperTerminal. PC4 and PC5 pin
connect to external voltage input.
TIMER0_CH0 is the trigger source of ADC0 and ADC1. When the rising edge of
TIMER0_CH0 coming, ADC0 and ADC1 convert the regular channel group parallelly. The
values of ADC0 and ADC1 are transmitted to array adc_value[0] and adc_value[1] by DMA.
When the first rising edge of TIMER0_CH0 coming, the value of the ADC0 conversion of PC4
pin is stored into the low half word of adc_value[0], the value of the ADC1 conversion of PC5
pin is stored into the high half word of adc_value[0]. When the second rising edge of
TIMER0_CH0 coming, the value of theADC0 conversion of PC5 pin is stored into the low half
word of adc_value[1], the value of the ADC1 conversion of PC4 pin is stored into the high half
word of adc_value[1].
When the program is running, HyperTerminal displays the regular value of ADC0 and ADC1