GigaDevice Semiconductor GD32103C-EVAL User manual

GigaDevice Semiconductor Inc.
GD32103C-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........................................................................................................................... 7
4Hardware layout overview........................................................................................................ 8
4.1 Power................................................................................................................................... 8
4.2 Boot...................................................................................................................................... 8
4.3 LED....................................................................................................................................... 9
4.4 KEY...................................................................................................................................... 9
4.5 USART............................................................................................................................... 10
4.6 ADC.................................................................................................................................... 10
4.7 DAC.................................................................................................................................... 10
4.8 I2S.......................................................................................................................................11
4.9 I2C.......................................................................................................................................11
4.10 SPI...................................................................................................................................... 12
4.11 CAN.................................................................................................................................... 12
4.12 SDIO................................................................................................................................... 12
4.13 NAND................................................................................................................................. 13
4.14 LCD.................................................................................................................................... 14
4.15 USBD ................................................................................................................................. 14
4.16 Extension............................................................................................................................ 15
4.17 GD-Link.............................................................................................................................. 15
5Routine use guide ................................................................................................................... 16
5.1 GPIO_Runing_Led............................................................................................................. 16
5.2 GPIO_Key_Polling_mode.................................................................................................. 16
5.3 EXTI_Key_Interrupt_mode ................................................................................................ 17
5.4 USART_Printf..................................................................................................................... 17
5.5 USART_HyperTerminal_Interrupt...................................................................................... 18
5.6 USART_DMA..................................................................................................................... 18
5.7 ADC_Temperature_Vrefint................................................................................................. 19
5.8 ADC0_ADC1_Follow_up_mode ........................................................................................ 20
5.9 ADC0_ADC1_Regular_Parallel_mode.............................................................................. 21
5.10 DAC_Output_Voltage_Value.............................................................................................. 22
5.11 I2C_EEPROM.................................................................................................................... 23
5.12 SPI_SPI_Flash................................................................................................................... 24
5.13 I2S_Audio_Player .............................................................................................................. 25
5.14 EXMC_NandFlash ............................................................................................................. 26
5.15 EXMC_TouchScreen.......................................................................................................... 28
5.16 SDIO_SDCardTest............................................................................................................. 29
5.17 CAN_Network..................................................................................................................... 30

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5.18 RCU_Clock_Out................................................................................................................. 30
5.19 PMU_sleep_wakeup.......................................................................................................... 31
5.20 RTC_Calendar ................................................................................................................... 31
5.21 TIMER_Breath_LED .......................................................................................................... 32
5.22 USBD_Keyboard................................................................................................................ 33
5.23 USBD_CDC_ACM ............................................................................................................. 34
6Revision history....................................................................................................................... 35

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List of Tables
Table 1. Function pin assign.......................................................................................................................... 4
Table 2. Revision history.............................................................................................................................. 35

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1 Summary
GD32103C-EVAL uses GD32F103VCT6 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, SDIO, USBD, GD-Link and Extension Pins
are also included. For more details please refer to GD32103C-EVAL-V1.2 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
CAN
PD0
CAN0_RX
PD1
CAN0_TX

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SDIO
PD2
SDIO_CMD
PC12
SDIO_CLK
PC8
SDIO_DAT0
PC9
SDIO_DAT1
PC10
SDIO_DAT2
PC11
SDIO_DAT3
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
USBD
PA11
USB_DM
PA12
USB_DP

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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 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
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_RX
USART0_TX
USART0_RX
1
6
2
7
3
8
4
9
5
J2
COM1
GND
USART0/USART1
RS232_TX2
RS232_RX2PA3
PA2
PA9
PA10
RS232_TX1
RS232_RX1
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 an AFIO, please refer to SPI Schematic for rightconfig
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
PB15
I2S_WS
I2S_DIN
I2S_CK
MDIN
MCLK
MSEL
I2S_MCK
I2S_WS
I2S_DIN
I2S_CK
PA4
I2S_MCK
MSEL
MCLK
MDIN
PC6
PA7
PB13
PB12
I2S
SPI0_SCK
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 is anAFIO, please refer to CAN Schematic for right config
PB6

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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
SPIFlash_CS
R21
10KΩ
+3V3 C32
50V/0.1uF
GND
PA6SPI0_MOSIPA7
SPI0_SCK
PA51
2
3
JP12
HEADER 3
DAC_OUT1
Short JP12(1,2) for DACfunction
Short JP12(2,3) for SPI0 function
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
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
Short P2(2,3) for CAN0 function
Short P3(1,2) for EXMC function
Short P3(2,3) for CAN0 function
4.12 SDIO
R48
10KΩ
R47
10KΩ
R46
10KΩ
R45
10KΩ
+3V3
+3V3
E9
16V/10uF,AVX
GND
PD2
PC12
PC8
PC9
PC10
SDIO_DAT3
SDIO_CMD
SDIO_CLK
SDIO_DAT0
SDIO_DAT1
SDIO_DAT2
PC11
SDIO_DAT3
SDIO_CMD
SDIO_CLK
SDIO_DAT0
SDIO_DAT1
SDIO_DAT2D2
1D3
2CMD
3VCC
4CLK
5GND
6D0
7D1
8CD
9JP21
TF_CARD_SOCKET
+3V3
SDIO

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4.13 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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4.14 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
SPI0_MISO
SPI0_MOSI
PA5
TP_INT PE5
R65
10KΩ
+3V3
PA6
RS
PD0
PD1
EXMC_NE0PD7
PA7
1
2
3
JP24
HEADER 3
LCD_CS
Nand_CS
PD0,PD1 are AFIOs, please refer to CANschematic for right config
SPI0_SCK
4.15 USBD
GND
R58 22R
R59 22R
PA11
PA12
R62
1MΩ
C49
50V/4700pF
USB_DM
USB_DP
VBUS
1
DM
2
DP
3
ID
4
GND
5
Shield
6
USB_MiniAB receptacle
CN2
Mini_USB
+U5V
R61 1.5KΩ
PD13

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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
4.17 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
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
HXTAL
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
+U5V

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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
GD32103C-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
GD32103C-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
GD32103C-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_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, 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
Download the program <07_ADC_Temperature_Vrefint> to the GD32103C-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.