GigaDevice Semiconductor GD32F310C-EVAL User manual

GigaDevice Semiconductor Inc.
GD32F310C-EVAL
Arm®Cortex®-M4 32-bit MCU
User Guide
Revision 1.0
(Mar. 2022)

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Table of Contents
TABLE 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............................................................................................................................... 7
4.4. KEY............................................................................................................................... 7
4.5. USART0........................................................................................................................ 7
4.6. ADC .............................................................................................................................. 8
4.7. I2C................................................................................................................................. 8
4.8. QSPI-FLASH................................................................................................................. 8
4.9. SPI-TFT LCD................................................................................................................. 9
4.10. IFRP........................................................................................................................... 9
4.11. GD-Link................................................................................................................... 10
4.12. Extension................................................................................................................ 10
4.13. MCU......................................................................................................................... 11
5. ROUTINE USE GUIDE............................................................................................ 11
5.1. GPIO_Running_LED.................................................................................................. 11
5.1.1. DEMO purpose......................................................................................................................11
5.1.2. DEMO running result .............................................................................................................11
5.2. GPIO_Key_Polling_mode.......................................................................................... 12
5.2.1. DEMO purpose..................................................................................................................... 12
5.2.2. DEMO running result ............................................................................................................ 12
5.3. EXTI_Key_Interrupt_mode........................................................................................ 12
5.3.1. DEMO purpose..................................................................................................................... 12
5.3.2. DEMO running result ............................................................................................................ 12
5.4. USART_Printf............................................................................................................. 13
5.4.1. DEMO purpose..................................................................................................................... 13
5.4.2. DEMO running result ............................................................................................................ 13
5.5. USART_HyperTerminal_Interrupt............................................................................. 13
5.5.1. DEMO purpose..................................................................................................................... 13
5.5.2. DEMO running result ............................................................................................................ 13

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5.6. USART_DMA.............................................................................................................. 14
5.6.1. DEMO purpose..................................................................................................................... 14
5.6.2. DEMO running result ............................................................................................................ 14
5.7. ADC_conversion_triggered_by_timer...................................................................... 15
5.7.1. DEMO purpose..................................................................................................................... 15
5.7.2. DEMO running result ............................................................................................................ 15
5.8. I2C_EEPROM ............................................................................................................. 15
5.8.1. DEMO purpose..................................................................................................................... 15
5.8.2. DEMO running result ............................................................................................................ 15
5.9. QSPI_FLASH.............................................................................................................. 16
5.9.1. DEMO purpose..................................................................................................................... 16
5.9.2. DEMO running result ............................................................................................................ 16
5.10. SPI_TFT_LCD_Driver ............................................................................................. 17
5.10.1. DEMO purpose..................................................................................................................... 17
5.10.2. DEMO running result ............................................................................................................ 17
5.11. RCU_Clock_Out ..................................................................................................... 18
5.11.1. DEMO purpose..................................................................................................................... 18
5.11.2. DEMO running result ............................................................................................................ 18
5.12. CTC_Calibration..................................................................................................... 19
5.12.1. DEMO purpose..................................................................................................................... 19
5.12.2. DEMO running result ............................................................................................................ 19
5.13. PMU_sleep_wakeup............................................................................................... 19
5.13.1. DEMO purpose..................................................................................................................... 19
5.13.2. DEMO running result ............................................................................................................ 19
5.14. RTC_Calendar ........................................................................................................ 19
5.14.1. DEMO purpose..................................................................................................................... 19
5.14.2. DEMO running result ............................................................................................................ 20
5.15. IRInfrared_Transceiver .......................................................................................... 21
5.15.1. DEMO purpose..................................................................................................................... 21
5.15.2. DEMO running result ............................................................................................................ 21
5.16. TIMER_Breath_LED................................................................................................ 21
5.16.1. DEMO purpose..................................................................................................................... 21
5.16.2. DEMO running result ............................................................................................................ 21
6. REVISION HISTORY...............................................................................................23

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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 ...................................................................................... 7
Figure 4-4. Schematic diagram of Key function....................................................................................... 7
Figure 4-5. Schematic diagram of USART0 function ............................................................................... 7
Figure 4-6. Schematic diagram of ADC function...................................................................................... 8
Figure 4-7 Schematic diagram of I2C function......................................................................................... 8
Figure 4-8. Schematic diagram of QSPI-FLASH function........................................................................ 8
Figure 4-9. Schematic diagram of SPI-TFT LCD function ....................................................................... 9
Figure 4-10. Schematic diagram of IFRP function ................................................................................... 9
Figure 4-11. Schematic diagram of GD-Link function............................................................................ 10
Figure 4-12. Schematic diagram of Extension Pin................................................................................. 10
Figure 4-13. Schematic diagram of MCU Pin...........................................................................................11

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List of Tables
Table 2-1. Pin assignment........................................................................................................................... 5
Table 4-1. Boot configuration..................................................................................................................... 6
Table 6-1 Revision history ........................................................................................................................ 23

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1. Summary
GD32F310C-EVAL evaluation board uses GD32F310C8T6 as the main controller. As a
complete development platform of GD32F310 powered by Arm®Cortex®-M4 core, the
board supports full range of peripherals. It uses mini-USB interface to supply 5V power.
GD-Link, Reset, Boot, User button key, LED, I2C, USART, TFT-LCD, IFRP LED、IFRP
Transceiver, RTC, SPI,ADC and Extension Pin are also included. This document details
its hardware schematic and the relevant applications.
2. Function Pin Assign
Table 2-1. Pin assignment
Function
Pin
Description
LED
PA8
LED1
PA11
LED2
PA12
LED3
PA15
LED4
RESET
-
K1-Reset
KEY
PA0
K2-Wakeup
PC13
K3-Tamper
IR
PB4
IR_RX
PB9
IR_TX
I2C
PB6
I2C0_SCL
PB7
I2C0_SDA
USART0
PA9
RS232_TX
PA10
RS232_RX
SPI
PB13
SPI1_SCK
PB14
SPI1_MISO
PB15
SPI1_MOSI
PB10
SPI1_IO2
PB11
SPI1_IO3
PB12
SPIFlash_CS
PB0
TFT_CS
PB1
TFT_RESET
ADC
PA2
ADC_IN2
3. Getting started
The EVAL Board uses mini-USB connecter to get power, the hardware system power is
+5.0V. A GD-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 that the

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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. In order to solve the "Device Missing (s)"
problem, you can install GigaDevice.GD32F3x0_DFP.3.0.0.pack.
2. If you use IAR to open the project, install IAR_GD32F3x0_ADDON_3.0.0.exe to load the
associated files.
4. Hardware layout overview
4.1. Power supply
Figure 4-1. Schematic diagram of power supply
G
1
Vout 2
Vin
34
U4 AMS1117-3.3
E5
16V/10uF,AVX
E6
16V/10uF,AVX
GND
+3V3 LEDPWR
LED0603
R32
470Ω
P1
SMD1210P050TF
+5V
+U5V
4.2. Boot option
Figure 4-2. Schematic diagram of boot option
R18
10KΩ
1
2
3
JP4
BOOT0
GND BOOT0
+3V3
Table 4-1. Boot configuration
BOOT1
BOOT0
Boot Mode
Default
2-3
User memory
1-2
System memory
Changed by ISP
1-2
SRAM memory

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4.3. LED
Figure 4-3. Schematic diagram of LED function
PA11
PA12
PA15
PA8LED1
LED0603
LED2
LED0603
LED3
LED0603
LED4
LED0603
LED
GND
R25
470Ω
R26
470Ω
R27
470Ω
R28
470Ω
4.4. KEY
Figure 4-4. Schematic diagram of Key function
PA0
R29
10KΩ
+3V3
GND
PC13
R31
10KΩ
+3V3
GND
C19
50V/0.1uF
KEY
K2
K-1102B
K3
K-1102B
4.5. USART0
Figure 4-5. Schematic diagram of USART0 function
RS232_TX
VBUS 1
DM 2
DP 3
ID 4
GND 5
Shield 6
USB_MiniAB receptacle
CN2
Mini_USB
UD+
1
UD-
2
GND
3
RTS#
4
CTS#
5TNOW 6
VCC 7
TXD 8
RXD 9
V3 10
U5
CH340E
D+
D-
+3V3
+3V3
PA9
PA10
C24
50V/0.01uF
C25
50V/0.1uF
D+
D-
C21
50V/4700pF
R17
1MΩ
USART To USB
RS232_RX

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4.6. ADC
Figure 4-6. Schematic diagram of ADC function
+3V3
GND
ADC
C1
50V/0.1uF
R1
1KΩ
PA2VR1
10K
ADC_IN2
4.7. I2C
Figure 4-7 Schematic diagram of I2C function
PB6
PB7
A0
1
A1
2
A2
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U1
AT24C02C-SSHM-T
+3V3
GND
R5
4.7KΩ
R6
4.7KΩ
C3
50V/0.1uF GND
I2C
I2C0-SCL
I2C0-SDA
4.8. QSPI-FLASH
Figure 4-8. Schematic diagram of QSPI-FLASH function
CS
1
SO
2
WP
3
GND
4SI 5
SCLK 6
HOLD 7
VCC 8
U6
GD25Q16
+3V3
GND
SPI1_SCK
SPI1_MOSI
SPI1_MISO
SPIFlash_CS
SPI Flash
PB15 SPI1_MISO
SPIFlash_CS
R21
10KΩ
+3V3 C32
50V/0.1uF
GND
PB14
PB13
SPI1_MOSI
SPI1_SCK
PB12 SPI1_IO2SPI1_IO3
PB11
PB10 SPI1_IO2
SPI1_IO3

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4.9. SPI-TFT LCD
Figure 4-9. Schematic diagram of SPI-TFT LCD function
VCC
1
GND
2
TFT_CS
3
RESET
4
D/C
5
SDI(MOSI)
6
SCK
7
LED
8
SDO(MISO)
9
CN1
SPI_LCD_Interface
GND
PB0
PB1
R42
10KΩ
+3V3
C30
50V/0.1uF
+3V3
+3V3
R45
10KΩ
SPI1_MOSI
SPI1_SCK
SPI1_MISO
SPILCD_CS
SPI LCD
PB2
4.10. IFRP
Figure 4-10. Schematic diagram of IFRP function
+3V3
1
23
Q2
8050
GND
R10
1KΩ
R9
100Ω
PB9
LED5
IR333C-A 1
2
3
JP2
IRM-3638T
GND
GND
PB4
R11
10KΩ
C2
10V/4.7uF
R46
100Ω
+3V3
IR_OUT
TIMER_CH0

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4.11. GD-Link
Figure 4-11. Schematic diagram of GD-Link function
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
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_LED1LED0603
L_LED2LED0603
R109 470Ω
R110 470ΩGND
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
4.12. Extension
Figure 4-12. Schematic diagram of Extension Pin
EXTENTION
PA14PA15 PB3PB4PB5PB6PB7BOOT0 PB8PB9
GND
PA0PA1PA2
PF7PF6
PA13 PA12
PA11 PA10
PA9PA8
PB15
PB14 PB13
PB12 PB11
PB10 PB2
PB1PB0
PA7PA6
PA5PA4
PA3
+3V3
+3V3
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
JP6
10×2P2.54
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
JP8
10×2P2.54
GND

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4.13. MCU
Figure 4-13. Schematic diagram of MCU Pin
C15
50V/20pF
C16
50V/20pF
Y2
HC-49S-8MHz
R19
1MΩ
GND
OSC_IN
OSC_OUT OSC_OUT
OSC_IN
NRST
K1
K-1102B
+3V3
GND
R20
10KΩ
C12
50V/0.1uF
NRST
R18
10KΩ
1
2
3
JP4
BOOT0
GND BOOT0
+3V3
BOOT0
+3V3
C10
50V/0.1uF
C11
50V/0.1uF
GND
+3V3 GND
VDDA
PB11
PB10
PA3
PB8
PB9
PC13
PC14
PC15
PF7
PF6
PB15
PB14
PB13
PB12
SWDAT
SWCLK
NRST
L_TMS/IO
L_TCK/CLK
L_TReset
GDLinkSWD
GND C14
50V/10pF
C13
50V/10pF Y1
32.768KHz
PC14
PC15
PA0
PA1
PA2
PA7
PA6
PA5
PA4
PA13
PA12
PA11
PA10
PA9
PA8
PA14
PA15
PB2
PB1
PB0
PB6
PB7
PB3
PB4
PB5
GND
VDDA
C23
50V/0.1uF
+3V3 L1
BLM18BB220SN1D
GND
SWDAT
SWCLK
BOOT0
44
NRST
7
OSC_IN/PF0
5
OSC_OUT/PF1
6
PA0
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/SWDAT
34
PA14/SWCLK
37
PA15
38
PB018
PB119
PB220
PB339
PB440
PB541
PB642
PB743
PB845
PB946
PB10 21
PB11 22
PB12 25
PB13 26
PB14 27
PB15 28
PC13 2
PC14-OSC32_IN 3
PC15-OSC32_OUT 4
VDD
1
VDD_1
24
PF736
VDD_2
48
VDDA
9
VSS_1 23
PF635
VSS_2 47
VSSA 8
U3
GD32F310C8T6
1
2
3
4
JP1
4×1P2.54
SWDAT
SWCLK
GND
+3V3
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 for controlling the LED.
Learn to use SysTick to generate 1ms delay.
GD32F310C-EVAL board has four LEDs. The LED1, LED2, LED3 and LED4 are controlled
by GPIO. This demo will show how to light the LEDs.
5.1.2. DEMO running result
Download the program <01_GPIO_Running_LED> to the EVAL board, four LEDs will turn on
one by one from LED1 to LED4 every 200ms, and then turn off together. 200ms later, the
four LEDs work like previous again.

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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.
GD32F310C-EVAL board has three keys and four LEDs. The three keys are Reset key,
Tamper key and Wakeup key. The LED1, LED2, LED3 and LED4 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, wait for 50ms. Then
check the input value of the IO port again. If the value is still 0, indicates that the button is
pressed down successfully, and light the four LED2.
5.2.2. DEMO running result
Download the program <02_GPIO_Key_Polling_mode> to the EVAL board, When press
down the Tamper Key, LED2 will be turned on. Press down the Tamper Key again, LED2 will
be turned 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 to control the LED and the KEY
Learn to use EXTI to generate external interrupt
GD32F310C-EVAL board has three keys and four LEDs. The three keys are Reset key,
Wakeup key and Tamper key. The LED1, LED2, LED3 and LED4 are controlled by
GPIO.
This demo will show how to use 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, when
press down the Tamper Key, LED2 will be turned on. Press down the Tamper Key again,
LED2 will be turned off.

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5.4. USART_Printf
5.4.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
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 and run. And connect the
serial line to COM of EVAL board. This implementation outputs “USART printf example:
please press the Tamper Key” on the hyperterminal using COM. Press the Tamper key, serial
port will output “USART Printf Example”. The information via a serial port output as following.
5.5. USART_HyperTerminal_Interrupt
5.5.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use the EVAL_COM transmit and receive interrupts to communicate with
the hyperterminal
5.5.2. DEMO running result
Download the program <05_USART_HyperTerminal_Interrupt> to the EVAL board and run.
And connect the serial line to COM of EVAL board. Firstly, all the LEDs are turned on and off
for test. Then, the COM 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 and LED2 are turned on, LED3 and LED4 are turned off. Otherwise, LED1 and LED2
are turned off, LED3 and LED4 are turned on.
The information via a serial port output as following:

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5.6. USART_DMA
5.6.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use the COM transmit and receive using DMA
5.6.2. DEMO running result
Download the program <06_USART_DMA> to the EVAL board and run. And connect the
serial line to COM of EVAL board. Firstly, all the LEDs are turned on and off for test. Then,
the COM sends the tx_buffer array 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 and LED2 are turned on,
LED3 and LED4 are turned off. Otherwise, LED1 and LED2 are turned off, LED3 and LED4
are turned on.
The information via a serial port output as following:

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5.7. ADC_conversion_triggered_by_timer
5.7.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use ADC to convert analog to digital
Learn to use TIMER to generate a channel compare event
Learn to use LCD to show theADC converted result
TIMER0 CH0 event triggers ADC conversion, the value displayed on the LCD
corresponds to the ADC analog input, and changes with it. The converted data are
moved to SRAM through DMA continuously.
5.7.2. DEMO running result
Download the program <07_ADC_conversion_triggered_by_timer> to the
GD32F310C-EVAL board, adjust the adjustable potentiometer knob to change the
analog input. The ADC, which is triggered by TIMER0 CH0 event, will convert the analog
input, and you will see the result, a voltage curve, on the LCD. The curve adjusts with
the analog input.
5.8. I2C_EEPROM
5.8.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn how to use the master transmitting mode of the I2C module
Learn how to use the master receiving mode of the I2C module
Learn to read and write the EEPROM with the I2C interface
5.8.2. DEMO running result
Download the program <08_I2C_EEPROM> to the EVAL board and run. Connect serial
cable to COM, and open the HyperTerminal to show the print message.
Firstly, the data of 256 bytes will be written to the EEPROM from the address 0x00 and
printed by the serial port. Then, reading the EEPROM from address 0x00 for 256 bytes
and the result will be printed. Finally, compare the data that were written to the EEPROM
and the data that were read from the EEPROM. If they are the same, the serial port will
output "I2C-AT24C02 test passed!" and the four LEDs lights flashing, otherwise the
serial port will output "Err: data read and write aren't matching." and all the four LEDs
light.

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The output information via the serial port is as following.
5.9. QSPI_FLASH
5.9.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use the Quad-SPI mode of SPI unit to read and write NOR Flash with the
SPI interface
5.9.2. DEMO running result
The computer serial port line connected to the COM port of development board, set the
baud rate of HyperTerminal software to 115200, 8 bits data bit, 1 bit stop bit.
Download the program <09_QSPI_FLASH> to the EVAL board, the HyperTerminal
software can observe the operation condition and will display the ID of the flash, 256
bytes data which are written to and read from flash. Compare the data that were written
to the flash and the data that were read from the flash. If they are the same, the serial
port will output “SPI-GD25Q16 Test Passed!”, otherwise, the serial port will output “Err:

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Data Read and Write aren't Matching.”. At last, turn on and off the LEDs one by one. The
following is the experimental results.
5.10. SPI_TFT_LCD_Driver
5.10.1. DEMO purpose
This Demo includes the following function of GD32 MCU:
Learn how to use SPI to drive TFT LCD screen and display
GD32F310C-EVAL board has a TFT LCD screen which supports SPI interface. In this
demo, tests of font, number, draw and color are displayed on the LCD screen
respectively.
5.10.2. DEMO running result
Download the program <10_SPI_TFT_LCD_Driver> to the EVALboard. All the LEDs are

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turned on and then turned off for test.After that, the LCD screen on the board will display
the GUI tests in infinite loop.
5.11. RCU_Clock_Out
5.11.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED
Learn to use EXTI to generate external interrupt
Learn to use the clock output function of RCU
Learn to communicate with PC by USART
5.11.2. DEMO running result
Download the program <11_RCU_Clock_Out> to the EVAL board and run. Connect
serial cable to EVAL_COM, open the HyperTerminal. When the program is running,
HyperTerminal will display the initial information. Then user can choose the type of the
output clock by pressing the Tamper button.After pressing, the LED will be lit in turn and
HyperTerminal will display which mode be selected. The frequency of the output clock
can be observed through the oscilloscope by PA8 pin.
Information via a serial port output as following:

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5.12. CTC_Calibration
5.12.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use external low speed crystal oscillator (LXTAL) to implement the CTC
calibration function
Learn to use clock trim controller (CTC) to trim internal 48MHz RC oscillator (IRC48M)
clock
The CTC unit trim the frequency of the IRC48M based on an external accurate reference
signal source. It can automaticly adjust the trim value to provide a precise IRC48M clock.
5.12.2. DEMO running result
Download the program <12_CTC_Calibration> to the EVAL board and run. The LED1 will
turn on if the internal 48MHz RC oscillator (IRC48M) clock trim is OK.
5.13. PMU_sleep_wakeup
5.13.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use the USART receive interrupt to wake up the PMU from sleep mode
5.13.2. DEMO running result
Download the program <13_PMU_sleep_wakeup> to the EVAL board, connect serial
cable to EVAL_COM. After power-on, all the LEDs are off. The MCU will enter sleep
mode and the software stop running. When the USART0 receives a byte of data from
the HyperTerminal, the MCU will wake up from a receive interrupt. And all the LEDs will
flash together.
5.14. RTC_Calendar
5.14.1. DEMO purpose
This Demo includes the following functions of GD32 MCU:
Learn to use RTC module to implement calendar function
Learn to use USART module to implement time display