GigaDevice Semiconductor GD32107C-EVAL User manual

GigaDevice Semiconductor Inc.
GD32107C-EVAL
User Guide
V2.2

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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 USART................................................................................................................................. 9
4.6 ADC...................................................................................................................................... 9
4.7 DAC...................................................................................................................................... 9
4.8 I2S...................................................................................................................................... 10
4.9 I2C...................................................................................................................................... 10
4.10 SPI...................................................................................................................................... 10
4.11 CAN.....................................................................................................................................11
4.12 NAND..................................................................................................................................11
4.13 LCD.................................................................................................................................... 12
4.14 ENET.................................................................................................................................. 13
4.15 USBFS ............................................................................................................................... 13
4.16 Extension............................................................................................................................ 14
5Routine use guide ................................................................................................................... 15
5.1 GPIO_Runing_Led............................................................................................................. 15
5.2 GPIO_Key_Polling_mode.................................................................................................. 15
5.3 EXTI_Key_Interrupt_mode ................................................................................................ 16
5.4 USART_Printf..................................................................................................................... 16
5.5 USART_HyperTerminal_Interrupt...................................................................................... 17
5.6 USART_DMA..................................................................................................................... 17
5.7 ADC_Temperature_Vrefint................................................................................................. 18
5.8 ADC0_ADC1_Follow_up_mode ........................................................................................ 19
5.9 ADC0_ADC1_Regular_Parallel_mode.............................................................................. 20
5.10 DAC_Output_Voltage_Value.............................................................................................. 21
5.11 I2C_EEPROM.................................................................................................................... 22
5.12 SPI_SPI_Flash................................................................................................................... 23
5.13 I2S_Audio_Player .............................................................................................................. 24
5.14 EXMC_NandFlash ............................................................................................................. 25
5.15 EXMC_TouchScreen.......................................................................................................... 26
5.16 CAN_Network..................................................................................................................... 27
5.17 RCU_Clock_Out................................................................................................................. 28
5.18 PMU_sleep_wakeup.......................................................................................................... 29

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5.19 RTC_Calendar ................................................................................................................... 29
5.20 TIMER_Breath_LED .......................................................................................................... 30
5.21 ENET.................................................................................................................................. 31
5.22 USB_Device....................................................................................................................... 39
5.23 USB_Host........................................................................................................................... 40
6Revision history....................................................................................................................... 42

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List of Tables
Table 1 Function pin assign........................................................................................................................... 4
Table 2 Revision history............................................................................................................................... 42

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1 Summary
GD32107C-EVAL uses GD32F107VCT6 as the main controller. It uses Mini USB interface or
DC-005 connector to supply 5V power. SWD, Reset, Boot, User button key, LED, CAN, I2C,
I2S, USART, RTC, LCD, SPI, ADC, DAC, EXMC, ENET, USBFS and Extension Pins are also
included. For more details please refer to GD32107C-EVAL-V1.3 schematic.
2 Function Pin Assign
Table 1 Function pin assign
Function
Pin
Description
LED
PC0
LED2
PC2
LED3
PE0
LED4
PE1
LED5
RESET
K1-Reset
KEY
PA0
K2-Wakeup
PC13
K3-Tamper
PB14
K4-User key
USART0
PA9
USART0_TX
PA10
USART0_RX
USART1
PA2
USART1_TX
PA3
USART1_RX
ADC
PC3
ADC012_IN13
DAC
PA4
DAC_OUT0
PA5
DAC_OUT1
I2C
PB6
I2C0_SCL
PB7
I2C0_SDA
SPI
PA5
SPI0_SCK
PA6
SPI0_MISO
PA7
SPI0_MOSI
PE3
SPI0_CS
I2S
PA4
MSEL
PA5
MCLK
PA7
MDIN
PB12
I2S_WS
PB13
I2S_CK
PB15
I2S_DIN
PC6
I2S_MCK
CAN0
PD0
CAN0_RX
PD1
CAN0_TX

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CAN1
PB5
CAN1_RX
PB6
CAN1_TX
NAND Flash
PD14
EXMC_D0
PD15
EXMC_D1
PD0
EXMC_D2
PD1
EXMC_D3
PE7
EXMC_D4
PE8
EXMC_D5
PE9
EXMC_D6
PE10
EXMC_D7
PD11
EXMC_A16
PD12
EXMC_A17
PD4
EXMC_NOE
PD5
EXMC_NWE
PD6
EXMC_NWAIT
PD7
EXMC_NCE1
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
ENET
PB11
RMII_TX_EN
PB12
RMII_TXD0
PB13
RMII_TXD1
PC4
RMII_RXD0
PC5
RMII_RXD1
PA7
RMII_CRS_DV

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PC1
RMII_MDC
PA2
RMII_MDIO
PB0
RMII_INT
PA1
RMII_REF_CLK
USBFS
PA9
USB_VBUS
PA11
USB_DM
PA12
USB_DP
PA10
USB_ID
3 Getting started
The EVAL board uses Mini USB connecter or DC-005 connector to get power DC +5V, which
is the hardware system normal work voltage. A J-Link tool 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
U2 LM1117-3.3
E1
16V/10uF,AVX
E2
16V/10uF,AVX
C17
50V/0.1uF
C18
50V/0.1uF
+3V3
LED1
LED0603
R7
470Ω
1
TP1
TP +3V3
+U5V
P1
SMD1210P005TF
5
S2
3
S
2
S1
1
4
SW1
SW-SPDT
1
3
2
CN1
DC-10B
GND
+5V
VCC
+5V
4.2 Boot
R4
10KΩ
1
2
3
JP2
BOOT0
GND
R5
10KΩ
1
2
3
JP3
BOOT1
GND
BOOT0
PB2
+3V3
+3V3
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
PC0
PC2
PE0
PE1
LED2
LED0603
LED3
LED0603
LED4
LED0603
LED5
LED0603
R13
470Ω
R14
470Ω
R15
470Ω
R16
470Ω
LED
LED2
LED3
LED4
LED5
GND
4.4 KEY
KEY1 K2
K-1102B
R17
10KΩ
+3V3
GND
C28
50V/0.1uF
KEY2K3
K-1102B
R18
10KΩ
+3V3
GND
C29
50V/0.1uF
KEY3K4
K-1102B
R19
10KΩ
+3V3
GND
C30
50V/0.1uF
KEY1
KEY2
KEY3
PA0
PC13
PB14
KEY

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4.5 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
U3
MAX3232CSE+
+3V3
GND
C23
50V/0.1uF
C25
50V/0.1uF
C24
50V/0.1uF
C22
50V/0.1uF
C21 50V/0.1uF
GND 1
6
2
7
3
8
4
9
5
J1
COM2
GND
USART1_TX
USART1_TX
USART1_RX
USART0_TX
USART0_RX
USART0_RX
1
6
2
7
3
8
4
9
5
J2
COM1
GND
USART0/USART1
RS232_TX2
RS232_RX2PA3
PA2
1
2
3
JP6
HEADER 3
PA10
USB_ID
Short JP5(2,3),Short JP6(2,3)for USB FS function
RS232_TX1
RS232_RX1
1
2
3
JP4
HEADER 3
RMII_MDIO
Short JP4(2,3)for USART1 function
Short JP5(1,2),Short JP6(1,2)for USART0 function
Short JP4(1,2) for Ethernet function
USART0_TX 1
2
3
JP5
HEADER 3
PA9
USB_VBUS
4.6 ADC
+3V3
GND
ADC
C27
50V/0.1uF
R12
1KΩ
PC3VR1
10K
1
TP2
TP ADin
ADC012_IN13
4.7 DAC
PA4
DAC
DAC_OUT0
DAC_OUT1
PA5 is anAFIO, please refer to SPI Schematic for right config
PA5
1
2
3
JP7
DAC
GND

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4.8 I2S
LRCK
1
DATA
2
BCK
3
PD
4
AGND
5
HGND
6
Vcom
7
HoutR
8
SCKI 16
HoutL 9
AIN 10
Vhp 11
VCC 12
MD 13
MC 14
MS 15
U10
PCM1770 PM
NRST
GND
+3V3
E6
16V/10uF,AVX
5
4
3
2
1
J3
HeadPhone
E7
10V/220uF,AVX
E8
10V/220uF,AVX
R43
16RR44
16R
C45
50V/0.22uF
C46
50V/0.22uF
GND
C43
50V/0.1uF
E416V/10uF,AVX
GND
GND
PB12
PB15
PB13
I2S_WS
I2S_DIN
I2S_CK
MDIN
MCLK
MSEL
I2S_WS
I2S_DIN
I2S_CK
PA4
I2S_MCK
MSEL
MCLK
MDIN
1
2
3
JP18
HEADER 3
1
2
3
JP19
HEADER 3
RMII_TXD0 RMII_TXD1
Short JP18(1,2) and JP19(1,2) for Etherner function
SPI0_MOSIPA7
Short JP18(2,3) and JP19(2,3) for I2S function
I2S_MCKPC6
SPI0_SCK
C44
50V/0.1uF
E516V/10uF,AVX
4.9 I2C
A0
1
A1
2
A2
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U4
AT24C02C-SSHM-T
+3V3
GND
R10
4.7KΩ
R11
4.7KΩI2C0_SCL
I2C0_SDA
I2C
C26
50V/0.1uF GND
PB7
PB6
PB6 is anAFIO, please refer to CANSchematic for right config
4.10 SPI
CS
1
SO
2
WP
3
GND
4SI 5
SCLK 6
HOLD 7
VCC 8
U5
GD25Q16
+3V3
GND
SPI0_SCK
SPI0_MOSI
SPI0_MISO
SPIFlash_CS
SPI Flash
PE3SPI0_MISO
SPI0_SCK SPI0_MOSI
SPIFlash_CS
R21
10KΩ
+3V3 C32
50V/0.1uF
GND
PA5
PA6
PA7
1
2
3
JP12
HEADER 3
Short JP12(1,2) for DACfunction
1
2
3
JP13
HEADER 3
RMII_CRS_DVDAC_OUT1
Short JP12(2,3) for SPI0 function Short JP13(1,2) for Ethernetfunction
Short JP12(2,3) for SPI0 function

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4.11 CAN
D
1
GND
2
VCC
3
R
4Vref 5
CANL 6
CANH 7
RS 8
U6
SN65HVD230
CAN0H
CAN0L
R22 0Ω
GND
R23
120Ω1
2
JP14
HEADER 2
CAN0_TX
CAN0_RX
PD1
PD0
GND
+3V3 C33
50V/0.1uF
GND
CAN
D
1
GND
2
VCC
3
R
4Vref 5
CANL 6
CANH 7
RS 8
U7
SN65HVD230
CAN1H
CAN1L
R24 0Ω
GND
R25
120Ω1
2
JP15
HEADER 2
CAN1_TX
CAN1_RX
GND
+3V3 C34
50V/0.1uF
GND
PB5
1
2
3
P2
MHDR1X3
1
2
3
P3
MHDR1X3
CAN0_TX
CAN0_RX
Short P2(1,2) for EXMC function
EXMC_D2
EXMC_D3
1
2
3
P4
MHDR1X3
CAN1_TX
PB6
I2C0_SCL
Short P2(2,3) for CAN0 function
Short P3(1,2) for EXMC function
Short P3(2,3) for CAN0 function
Short P4(2,3) for CAN1 function
Short P4(1,2) for I2C0 function
4.12 NAND
CL
16
AL
17
W
18
R
8
E
9
VSS2 36
VSS1 13
VDD237
VDD112 IO7
44
IO6
43
IO5
42
IO4
41
IO3
32
IO2
31
IO1
30
IO0
29
WP 19
RB 7
U11
HY27UF081G2A
EXMC_A16
EXMC_A17
EXMC_NWE
EXMC_NOE
Nand_CS
R64
10KΩ
+3V3 R63 10KΩ+3V3
R66
10KΩ+3V3
EXMC_NWAIT
GND
+3V3
Nand Flash
EXMC_D7
EXMC_D6
EXMC_D5
EXMC_D4
EXMC_D3
EXMC_D2
EXMC_D1
EXMC_D0
C50
50V/0.1uF
C51
50V/0.1uF
+3V3
GND
EXMC_D0
EXMC_D1
EXMC_D2
EXMC_D3
EXMC_D4
EXMC_D5
EXMC_D6
EXMC_D7
EXMC_NWE
EXMC_NOE
PD14
PD15
PE7
PE8
PE9
PE10
PD4
PD5
PD0
PD1
EXMC_A17
EXMC_A16
EXMC_NWAIT
EXMC_NE0
PD11
PD12
PD6
PD71
2
3
JP24
HEADER 3
LCD_CS
Nand_CS
PD0,PD1 are AFIOs, please refer to CANschematic for right config

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4.13 LCD
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
JP23
LCD
+3V3 GND
EXMC_D0 EXMC_D1
EXMC_D2
EXMC_D4
EXMC_D6
EXMC_D8
EXMC_D10
EXMC_D12
EXMC_D3
EXMC_D5
EXMC_D7
EXMC_D9
EXMC_D11
EXMC_D13
EXMC_D15
EXMC_A23
EXMC_NOE
EXMC_D14
LCD_CS
EXMC_NWE
NRST
LCD
+3V3
EXMC_D0
EXMC_D1
EXMC_D2
EXMC_D3
EXMC_D4
EXMC_D5
EXMC_D6
EXMC_D7
EXMC_D8
EXMC_D9
EXMC_D10
EXMC_D11
EXMC_D12
EXMC_D13
EXMC_D14
EXMC_D15
EXMC_A23
EXMC_NWE
EXMC_NOE
PD14
PD15
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
PD8
PD9
PD10
PE2
PD4
PD5
BackLight
PE4
SPI1_MISO TP_INT PE5
R65
10KΩ
+3V3
PA6
RS
PD0
PD1
EXMC_A17
EXMC_A16
EXMC_NE0
PD11
PD12
PD71
2
3
JP24
HEADER 3
LCD_CS
Nand_CS
PD0,PD1 are AFIOs, please refer to CANschematic for rightconfig
SPI1_MOSIPA7
PA5SPI1_SCK

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4.14 ENET
TX_CLK
1
TX_EN
2
TXD_0
3
TXD_1
4
TXD_2
5
TXD_3/SNI_MODE
6
PWR_DOWN/INT
7
NC 8
NC 9
NC 10
NC 11
NC 12
RD-13
RD+14
AGND 15
TD-16
TD+17
PFBIN1
18
AGND 19
NC 20
NC 21
AVDD33 22
PFBOUT
23
RBIAS
24
25MHz_OUT
25
LED_ACT/COL/AN_EN 26
LED_SPEED/AN127
LED_LINK/AN028
RESET_N
29
MDIO
30 MDC
31
IOVDD33 32
X2
33
X1
34
IOGND 35
DGND 36
PFBIN2
37
RX_CLK
38 RX_DV/MII_MODE
39
CRS/CRS_DV/LED_CFG
40
RX_ER/MDIX_EN
41
COL/PHYAD0
42
RXD_0/PHYAD1
43
RXD_1/PHYAD2
44
RXD_2/PHYAD3
45
RXD_3/PHYAD4
46
IOGND 47
IOVDD33 48
U8
DP83848CVV
+3V3 R32
2.2KΩRMII MODE
R33
1.5K
+3V3
NRST
R40
2.2KΩ
+3V3
R41 4.87K
GND
E3
16V/10uF,AVX
C37
50V/0.1uF
C38
50V/0.1uF
C39
50V/0.1uF
GND
GND
+3V3
R38 2.2KΩ
R39 2.2KΩ
+3V3
R34
2.2KΩ
R35
2.2KΩ
R36
2.2KΩ
+3V3
TD+
1
4
TD-
2
RD+
3
5
RD-
6
L+
9
L-
10
R+
12
R-
11
GND113
GND214
JP16
HR911105A
GND
+3V3
R26
49.9Ω
R27
49.9ΩR28
49.9Ω
R29
49.9Ω
C36
50V/0.1uF
C35 50V/0.1uF
GND GND
R30
240Ω
R31
240Ω
C40
50V/0.1uF
C41
50V/0.1uF
C42
50V/0.1uF
+3V3
GND
PB11
PC4
PC5
PA1
PA8MCO
RMII_TX_EN
RMII_TXD0
RMII_TXD1
RMII_RXD0
RMII_RXD1
RMII_CRS_DV
RMII_MDC
RMII_MDIO
RMII_INT
RMII_REF_CLK
RMII_TX_EN
RMII_TXD0
RMII_TXD1
RMII_RXD0
RMII_RXD1
PC1
PB0
RMII_MDC
RMII_MDIO
RMII_INT
RMII_REF_CLK
RMII_CRS_DV
RP2
33R
RP3
33R
PB12 and PB13 are AFIOs，refer to I2S schematic for right config
PB12
PB13
PA2
PA7
PA2 is anAFIO, refer to USART schematic for right config
PA7 is anAFIO, refer to SPI schematic for right config
4.15 USBFS
GND
R54
10KΩ
R55
470R
R58 22R
R59 22R
PD13
E10
16V/10uF,AVX C48
50V/0.1uF
GND
PA11
PA12
1
2
3
Q1
S8550
R62
1MΩ
C49
50V/4700pF
+5V
USB_VBUS
USB_DM
USB_DP
VBUS
1
DM
2
DP
3
ID
4
GND
5
Shield
6
USB_MiniAB receptacle
CN2
Mini_USB
+U5V
PA9
PA9,PA10 are AFIOs, please refer to USARTschematic for right config
R60 0RUSB_IDPA10
R57 0R
R56
0R

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4.16 Extension
Extension Pin
PE2
PE4
PE6
PC13
PC15
PIN12
PIN14
PE3
PE5
VBAT
PC14
PIN13
PC0
PC1PC2
PC3PA0
PA1PA2
PA3
PA5
PA7
PC5
PB1
PE8
PA4
PA6
PC4
PB0
PB2
PE9
PE7
PE10 PE11
PE12
PB11
PE13
PE15PE14
PB10
GND +3.3V
PB12
PB14
PD8
PD10
PD12
PA11
PC7
PB13
PB15
PD9
PD11
PD13
PA10
PD14 PD15
PC8
PC9PA8
PA9PA12
PA13 GND
PA14
PC10
PC12
PD1
PD3
PD5
PD7
PB8
PB3
PA15
PC11
PD0
PD2
PD4
BOOT0
PD6
PB4
PB5PB6
PB7
PE1
PB9
PE0
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
JP8
15×2P2.54
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
JP9
15×2P2.54
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
JP10
15×2P2.54
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
JP11
15×2P2.54
PC6
GNDGND GND GND
+3.3V
+3.3V
+3.3V
+3.3V

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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
GD32107C-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
GD32107C-EVAL board has four keys and four LEDs. The five keys are Reset key, Tamper
key, Wakeup key, 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 LED3. 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 LED3.
5.2.2 DEMO Running Result
Download the program <02_GPIO_Key_Polling_mode> to the EVAL board, press down the
Tamper Key, LED3 will be turned on. Press down the Tamper Key again, LED3 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
GD32107C-EVAL board has four keys and four LEDs. The five keys are Reset key, Tamper
key, Wakeup key, 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 LED3.When press down
the Tamper Key, it will produce an interrupt. In the interrupt service function, the demo will
toggle LED3.
5.3.2 DEMO Running Result
Download the program <03_EXTI_Key_Interrupt_mode> to the EVAL board, Press down the
Tamper Key, LED3 will be turned on. Press down the Tamper Key again, LED3 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, jump the JP5 to USART
with the jumper cap and 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, jump
the JP5 to USART with the jumper cap and 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 have
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_DMA
5.6.1 DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn to use the USART transmit and receive data using DMA

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5.6.2 DEMO Running Result
Download the program < 06_USART_DMA > to the EVAL board, jump the JP5 to USART
with the jumper cap and 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
same bytes as tx_buffer from the serial terminal. The data MCU have 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.
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
Jump the JP5 to USART with the jumper cap, and then download the program
<07_ADC_Temperature_Vrefint> to the GD32107C-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
Jump the JP5 to USART0 with the jumper cap, and then download the program
<08_ADC0_ADC1_Follow_up_mode> to the GD32107C-EVAL board. Connect serial cable
to EVAL_COM0, open the HyperTerminal. PC3 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 PC3
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