ST STEVAL-IPC002V1 User manual

June 2010 Doc ID 16916 Rev 1 1/30
UM0886
User manual
STEVAL-IPC002V1 demonstration board
for parking ticket vending machine
Introduction
A parking ticket vending machine is a hand-held, battery operated device, inside of which a
thermal printer is interfaced with the STM32 microcontroller from STMicroelectronics. This
document focuses on the STEVAL-IPC002V1 demonstration board, whose objective is to
print and generate parking tickets for different types of vehicles. The application can easily
be modified to suit other applications where paper printing is to be managed directly by the
microcontroller, such as POS-based applications, railway and bus ticket printing
applications, standalone printers, and the like.
Figure 1. STM32-based parking ticket vending machine
The thermal printer has an in-built stepper motor for thermal paper feeding, paper
movement, and so on. The stepper motor is controlled by a dedicated stepper-motor driver
with an SPI interface. The system operates on two Li-Ion batteries and an optional DC
adaptor. On-board battery chargers are available to charge the batteries from the DC
adaptor. The data to be printed is entered by way of touch keys, and can be verified on an
alphanumeric LCD.
www.st.com

Contents UM0886
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Contents
1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Hardware layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Hardware design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.1 Microcontroller(STM32) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.2 Battery connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.3 Thermal printer (FM205-HS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.4 Alphanumeric LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.5 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.6 S-Touch-based keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.7 Power supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Hardware schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

UM0886 List of figures
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List of figures
Figure 1. STM32-based parking ticket vending machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. STM32-based parking ticket vending machine demonstration board . . . . . . . . . . . . . . . . . . 7
Figure 3. S-Touch-based keypad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Sample printed ticket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Hardware layout: main board - top side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Hardware layout: main board - bottom side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Hardware layout: daughterboard S-Touch keypad - top side . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Hardware layout: daughterboard S-Touch keypad - bottom side . . . . . . . . . . . . . . . . . . . . 11
Figure 9. Block diagram of an STM32-based parking ticket vending machine . . . . . . . . . . . . . . . . . 12
Figure 10. Truth table for excitation sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11. Timing diagram for excitation sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 12. Power block of STM32-based parking ticket vending machine . . . . . . . . . . . . . . . . . . . . . 14
Figure 13. Voltage regulators used in power block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 14. Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 15. Schematic: microcontroller section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 16. Schematic: motor driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 17. Schematic: connectors (printer, LCD and JTAG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 18. Schematic: power management section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19. Schematic: S-Touch keypad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Definitions UM0886
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1 Definitions
Table 1. Definitions
Acronym Definition
ESD Electrostatic discharge
I2C Inter-integrated circuit
JTAG Joint test action group
LCD Liquid crystal display
MCU Microcontroller unit
POS Point of sale
PTVM Parking ticket vending machine
RTC Real time clock
SPI Serial peripheral interface

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2 Features
The STM32-based demonstration board has the following key features.
●Thermal printer interfaced through SPI2.
●Stepper motor driver interfaced through SPI1 used to rotate the printer head while
printing.
●S-Touch™-based keypad for user interfacing. The S-Touch™ controller device is
interfaced through the I2C2. The keypad is used to enter the vehicle number and other
parameters, and set the date and time.
●LED indication for battery status.
●On-board JTAG connector for firmware upgrades and changes.
●Alphanumeric LCD for displaying numbers and settings entered through the S-Touch™
keypad.
●SPDT switch for switching the system ON and OFF.
●Push button switch for resetting the system.
●Rechargeable battery circuit.
●On-board power supply. The entire system can be powered by either a DC adaptor
(9 V, 2.5 A) or battery (2 batteries of 3.7 V each, 1.8 Ah ratings).
●Thermistor to monitor the temperature of the thermal head.
●STM32 in-built RTC (real time clock) that provides date and time of printing.
●EEPROM interfaced through I2C1. The last 20 vehicle numbers are stored in the
EEPROM.

Getting started UM0886
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3 Getting started
3.1 Package
The STM32-based parking ticket vending machine demonstration board includes the
following items.
●Hardware:
– demonstration board
●Documentation:
– this user manual
– schematics, gerber files, BOM
●Firmware:
– pre-programmed STM32 device soldered on the demonstration board
– object files for the firmware
3.2 Hardware installation
The following instructions are for setting-up the STM32-based parking ticket vending
machine demonstration board.
1. Connect the 9 V, 2.5 A DC adaptor or connect two Li-Ion batteries (3.7 V, 1800 mAH) to
the connectors B1+, B1-, B2+ and B2-.
2. Feed the thermal paper (50 to 52 mm width) with the glossy (thermal printing) side up
as shown in Figure 2.
Note: Avoid running the demonstration board without inserting the thermal paper since this can
cause the printer to overheat and cause permanent damage.
3. Switch on the board (SPDT ON/OFF power switch).
You should now see the word "VEHICLE" on the LCD.
4. Select the vehicle type by pressing one of the following key combinations.
– 4 WHL: FUNC + 1
– 2 WHL: FUNC + 2
– HEAVY FUNC + 3
For example, to select a 4 WHL type vehicle, press "FUNC" (function key) and then "1".
The selected vehicle type is displayed on the LCD for 1 second.
5. The word "ENTRY" appears on the LCD. Press one of the following key combinations
to select the entry type.
– SINGLE: FUNC + 7
– PASS: FUNC + 8
The selected entry type is displayed on the LCD for 1 second.
6. Enter the vehicle number (last 4 digits) by pressing the corresponding numeric keys on
the keypad.
The number is now displayed on the LCD.
7. Send the print command by pressing the PRINT function (FUNC + 0).
The ticket is printed.

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The time can be set by pressing the SET function (FUNC + 9).
The 9 V adaptor is used to charge the batteries through the on-board battery charger.
To see the last 20 entries, press "FUNC" and then "6".
Figure 2. STM32-based parking ticket vending machine demonstration board
8. To replace the thermal paper, pull the black roll out of the printer. Place the paper (50 to
52 mm width) so that the glossy side faces up as shown in Figure 2. Put the black roll
back into place. If the paper is not inserted correctly the printout may not come out
properly.
!-V
4HERMALPAPER
4HERMALPRINTER
!LPHANUMERIC,#$
3TEPPERMOTORDRIVER
34-
*4!'CONNECTOR
0OWERONOFF30$4
34OUCHKEYBOARD
0OWER*ACK
"ATTERYCONNECTORS
2ELAY

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Figure 3. S-Touch-based keypad
The vehicles are categorized as follows:
●4 WHL = 4-wheelers (cars)
●2 WHL = 2-wheelers (bikes and scooters)
●HEAVY = heavy vehicles such as trucks or buses
The entry types are:
●Single = single entry/exit
●PASS = the user has a pass for multiple entries and exits.
Figure 4 shows a sample printed ticket generated from the PTVM.
Figure 4. Sample printed ticket
!-V
%3#ESCAPEKEY
&5.##,2
7(,&5.#
7(,&5.#
(%!69&5.#
#,2CLEARKEY
-%-/29&5.#
&5.#FUNCTIONKEY
0!33&5.#
3%4&5.#
3).',%&5.#
02).4&5.#

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3.3 Hardware layout
The STM32-based parking ticket vending machine demonstration board is built using
STMicroelectronics' ARM® Cortex-M3 core-based STM32F103RBT6 in a 64-pin LQFP64
package. The components used on this board are listed below. Figure 5 and Figure 6
provide the component layouts to assist you in locating the different component sections on
the board.
●ST components:
– STM32F103RBT6 (32-bit MCU)
– L9935 (stepper motor driver)
– STMPE1208S (S-Touch keypad)
– M24C01-W (EEPROM)
– L6924D (battery charger)
– L5987A (step-down voltage regulator)
– STM1061N31WX6F (low-power voltage detector for battery monitoring)
●Non-ST components:
– FM205-HS (thermal printer)
– 16X2 alphanumeric LCD
Refer to the bill of materials in Chapter 5 for a detailed list of components.
Figure 5. Hardware layout: main board - top side

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Figure 6. Hardware layout: main board - bottom side
Figure 7. Hardware layout: daughterboard S-Touch keypad - top side