GigaDevice Semiconductor GD32L233C-START User manual

GigaDevice Semiconductor Inc.
GD32L233C-START
Arm® Cortex®-M23 32-bit MCU
User Guide
Revision 1.0
(Nov. 2021)

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Table of Contents
Table of Contents.................................................................................................................1
List of Figures ......................................................................................................................2
List of Tables ........................................................................................................................3
1. Summary.........................................................................................................................4
2. Function Pin Assign......................................................................................................5
3. Getting started...............................................................................................................6
4. Hardware layout overview ...........................................................................................7
4.1. Power supply.............................................................................................................7
4.2. Boot option................................................................................................................7
4.3. LED............................................................................................................................7
4.4. KEY............................................................................................................................8
4.5. USART.......................................................................................................................8
4.6. USB............................................................................................................................8
4.7. GD-Link......................................................................................................................9
4.8. Arduino......................................................................................................................9
4.9. MCU.........................................................................................................................10
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........................................................................................ 11
5.2.1. DEMO purpose......................................................................................................11
5.2.2. DEMO running result..............................................................................................11
5.3. EXTI_Key_Interrupt_mode......................................................................................12
5.3.1. DEMO purpose......................................................................................................12
5.3.2. DEMO running result..............................................................................................12
5.4. USART_HyperTerminal_Interrupt...........................................................................12
5.4.1. DEMO purpose......................................................................................................12
5.4.2. DEMO running result..............................................................................................12
5.5. TIMER_Key_EXTI ....................................................................................................13
5.5.1. DEMO purpose......................................................................................................13
5.5.2. DEMO running result..............................................................................................13
5.6. USBD_CDC_ACM....................................................................................................13
5.6.1. DEMO Purpose .....................................................................................................13
5.6.2. DEMO Running Result............................................................................................14
6. Revision history ..........................................................................................................15

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

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

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1. Summary
GD32L233C-START uses GD32L233CCT6 as the main controller. It uses GD-Link Mini USB
interface to supply 5V power. Reset, Boot, Button key, LED, USB and USART to USB interface
are also included. For more details, please refer to GD32L233C-START_Rev1.0 schematic.

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2. Function Pin Assign
Table 2-1. Function pinassignment
Function
Pin
Description
LED
PA7
LED1
PA8
LED2
PC6
LED3
PC7
LED4
RESET
Reset
KEY
PA0
K2(Wakeup key)
USART
PA 9
USART0_TX
PA 10
USART0_RX
USB
PA11
USB_DM
PA12
USB_DP

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3. Getting started
The EVAL board uses GD-Link Mini USB connecter to get power DC +5V, which is the
hardware system normal work voltage. 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 the power supply is OK.
There are Keil version and IAR version of all projects. Keil version of the projects are created
based on Keil MDK-ARM 5.26 uVision5. IAR version of the projects are created based on IAR
Embedded Workbench for ARM 8.32.1. During use, the following points should be noted:
1. If you use Keil uVision5 to open the project. In order to solve the "Device Missing (s)"
problem, you can install GigaDevice.GD32L23x_DFP_1.0.0.
2. If you use IAR to open the project, install IAR_GD32L23x_ADDON_1.0.0.exe to load the
associated files.

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4. Hardware layout overview
4.1. Powersupply
Figure 4-1. Schematic diagramof 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 diagramof boot option
R18
10KΩ
1
2
3
JP4
BOOT0
GND BOOT0
+3V3
R1
10KΩ
1
2
3
JP1
BOOT1
GND PB2
+3V3
4.3. LED
Figure 4-3. Schematic diagram of LED function
PA7LED1
LED0603
LED
R25
470ΩGND
R3
470Ω
PA8LED2
LED0603
R4
470Ω
LED3
LED0603
R5
470Ω
LED4
LED0603
PC6
PC7

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4.4. KEY
Figure 4-4. Schematic diagram ofKey function
PA0
R29
10KΩ
+3V3
GND
KEY
K2
K-1102B
C2
50V/0.01uF
4.5. USART
Figure 4-5. Schematic diagramof USART
UD+
1
UD-
2
GND
3
RTS#
4
CTS#
5TNOW 6
VCC 7
TXD 8
RXD 9
V3 10
U1
CH340E
D+
D-
+3V3
+3V3
USART_TX
USART_RX
C3
50V/0.01uF
C4
50V/0.1uF
D+
D-
C5
50V/4700pF
R2
1MΩ
USART To USB
VCC 1
D- 2
D+ 3
ID 4
GND 5
SHELL 6
CN1
Mini_USB
PA9-Tx
PA10-Rx
4.6. USB
Figure 4-6. Schematic diagramof USB
GND
R27 22Ω
R28 22Ω
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

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4.7. GD-Link
Figure 4-7. Schematic diagramof GD-Link
L_USB_Ctr
C100
50V/20pF
C102
50V/20pF
Y101
HC-49SMD-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_LED1 LED0603
L_LED2 LED0603
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
4.8. Arduino
Figure 4-8. Schematic diagram of Arduino
Ardunio
1
2
3
4
5
6
JP7
HEADER 6
1
2
3
4
5
6
7
8
JP6
HEADER 8
1
2
3
4
5
6
7
8
JP9
HEADER 8
1
2
3
4
5
6
7
8
9
10
JP8
HEADER 10
+5V
+5V
+3V3
+3V3
NRST
A6
A1
A2
A3
A4
A5 D0-Rx D1-Tx
D2
D4
D3~
D5
D6
D7
D8
D9~
D10
D13
D12
D11~
D14-SDA1
D15-SCL1
PA9-Tx
PA10-Rx
PB10
PB11
PA1
PA2
PA3
PA4
PA5
PA6
PB13
PB14
PB15
PB12
PB0
PB1
PB8
PB4
PB5
PB6
PB7
PB9

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4.9. MCU
Figure 4-9. Schematic diagram of MCU
C15
50V/20pF
C16
50V/20pF
Y2
HC-49SMD-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
BOOT0
+3V3
C10
50V/0.1uF
C11
50V/1uF
GND
+3V3
PB11
PB10
PA3
PB8
PB9
PC13
PC14
PC15
PB15
PB14
PB13
PB12
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-Rx
PA8
PA14
PA15
PB2
PB1
PB0
PB6
PB7
PB3
PB4
PB5
GND
VREF+
C23
50V/0.01uF
+3V3 L1
EBLS1608-3R3K
GND
C1
50V/0.1uF
PA9-Tx 1
2
3
4
JP2
4×1P2.54
+3V3
GND
SWD
BOOT0
46
NRST
7
OSC_IN/PF0
5
OSC_OUT/PF1
6
PA0
11
PA1
12 PA2
13 PA3
14
PA4
15 PA5
16
PA6
17
PA7
18
PA8
30 PA9
31 PA10
32 PA11
33 PA12
34
PA13/SWDAT
35 PA14/SWCLK
36
PA15
37
PB019
PB120
PB2/BOOT1 21
PB341
PB442
PB543
PB644
PB745
PB847
PB948
PB10 22
PB11 23
PB12 24
PB13 25
PB14 26
PB15 27
PC13 2
PC14-OSC32_IN 3
PC15-OSC32_OUT 4
VBAT
1
VREF+
9VSS 8
VDD
10
PC628
PC729
PC10 38
PC11 39
PC12 40
U3
GD32L233CCT6
VREF+
PC10
PC11
PC12
PC6
PC7
SWDAT
SWCLK
SWDAT
SWCLK

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5. Routine use guide
5.1. GPIO_Running_LED
5.1.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED
Learn to use SysTick to generate 1ms delay
GD32L233C-START board has two user keys and four LEDs. The keys are Reset key and
Wakeup key. The LEDs 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 START board, four LEDs can light
cycles.
5.2. GPIO_Key_Polling_mode
5.2.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use SysTick to generate 1ms delay
GD32L233C-START board has two user keys and four LEDs. The keys are Reset key and
Wakeup key. The LEDs are controlled by GPIO.
This demo will show how to use the Wakeup key to control the LED2. When press down the
Wakeup 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 START board, press down
the Wakeup key, LED2 will be turned on. Press down the Wakeup key again, LED2 will be
turned off.

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5.3. EXTI_Key_Interrupt_mode
5.3.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use EXTI to generate external interrupt
GD32L233C-START board has two user keys and four LEDs. The keys are Reset key and
Wakeup key. The LEDs are controlled by GPIO.
This demo will show how to use the EXTI interrupt line to control the LED2. When press down
the Wakeup 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 START board, LED2 is
turned on and off for test. When press down the Wakeup key, LED2 will be turned on. Press
down the Wakeup key again, LED2 will be turned off.
5.4. USART_HyperTerminal_Interrupt
5.4.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use the USART transmit and receive interrupts to communicate with the
HyperTerminal.
5.4.2. DEMO running result
Download the program <04_USART_HyperTerminal_Interrupt> to the EVAL board and
connect serial cable to USART. Firstly, all the LEDs are turned on and off for test. Then, the
USART sends the tx_buffer array (from 0x00 to 0xFF) to the hyperterminal and waits for
receiving data from the hyperterminal that youmust send. The stringthat you have sent is
storedin therx_buffer array. The receive buffer have a BUFFER_SIZE bytesas maximum.
After that, compare tx_bufferwith rx_buffer. If tx_buffer is same with rx_buffer, LED1, LED2,
LED3, LED4 flash by turns. Otherwise,LED1,LED2, LED3, LED4 toggle together.
The output information via the HyperTerminal is as following:

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5.5. TIMER_Key_EXTI
5.5.1. DEMO purpose
This demo includes the following functions of GD32 MCU:
Learn to use GPIO control the LED and the KEY
Learn to use EXTI to generate external interrupt
Learn to use TIMER to generate PWM
GD32L233C-START board has two keys and four LEDs. The two keys are Reset key and
Wakeup key. The LED1, LED2, LED3 and LED4 are controlled by GPIO.
This demo will show how to use the TIMER PWM to trigger EXTI interrupt to toggle the state
of LED2 and EXTI interrupt line to control the LED1. When press down the Wakeup Key, it
will produce an interrupt. In the interrupt service function, the demo will toggle LED1.
5.5.2. DEMO running result
Download the program < 05_TIMER_Key_EXTI > to the START board, all the LED1 and
LED2 are flashed once for test, press down the Wakeup Key, LED1 will be turned on. Press
down the Wakeup Key again, LED1 will be turned off. Connect PA6 (TIMER2_CH0) and PA4
with DuPont line. The LED2 will be toggled every 500ms.
5.6. USBD_CDC_ACM
5.6.1. DEMO Purpose
This demo includes the following functions of GD32 MCU:
Learn how to use the USBD peripheral
Learn how to implement USB CDC device
GD32L233C-START board has one USBD interface. In this demo, the GD32L233C-START
board is enumerated as an USB virtual COM port, which was shown in device manager of

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PC as below. This demo makes the USB device look like a serial port, and loops back the
contents of a text file over USB port. To run the demo, input a message using the PC's
keyboard. Any data that shows in HyperTerminal is received from the device.
5.6.2. DEMO Running Result
Download the program <06_USBD_CDC_ACM> to the START board and run. When user
input message through computer keyboard, the HyperTerminal will receive and shown the
message. For example, when you input “GigaDevice MCU”, the HyperTerminal will get and
show it as below.

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6. Revision history
Table 6-1. Revisionhistory
Revision No.
Description
Date
1.0
Initial Release
Nov.15, 2021

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