STMICROELECTRONICS STM8L1528-EVAL Demonstration Firmware

Introduction

This document describes the demonstration firmware running on the STM8L1528-EVAL evaluation board. You can use it to evaluate the capabilities of the STM8L151x, STM8L152x and STM8L162x microcontrollers and their on-board peripherals.
The evaluation board is delivered with the demonstration firmware stored in the Flash program memory of the microcontroller.
The firmware is based on the STM8L15x firmware library, and provides an example of how to use this library. It is divided into various smaller demonstration applications (demos).
In case the STM8L1528-EVAL evaluation board is not factory-programmed or the demonstration application has been erased, you can reprogram the demonstration firmware into the STM8L15x Flash memory by following the instructions provided in Section 4.
For more information about the evaluation board itself, please read the evaluation board user manual.

User Interface

Menu structure

The demonstration firmware user interface is based on a circular navigation menu, with submenus, item selection and back capability.
Figure 1 shows the menu system of the demonstration. The top row of items represents the main menu.
Figure 1. Menu structure and navigation

Documentation conventions

In this document, the keywords in bold indicate user actions on the joystick (5-way switch) and the RV3 potentiometer.
The present document follows the conventions shown in Table 1.

Table 1. Documentation conventions

Navigating menus and submenus

To navigate the menus and submenus, perform the following actions as required:
RIGHT: Navigates to the next menu or submenu items on the right.
LEFT: Navigates to the next menu or submenu items on the left.
SEL: Enters submenu.
UP: Exits from a submenu.

STM8L1528-EVAL board jumper configuration

To be able to run the STM8L1528-EVAL demo correctly, configure the following STM8L1528-EVAL board jumpers as follows:

• JP1: not fitted
• JP2: fitted in SWIM position
• JP3: Audio DAC1: fitted
• JP4: fitted in IDD position
• JP5: not fitted
• JP6: fitted
• JP7: not fitted
• JP8: not fitted
• JP9: fitted
• JP10: fitted
• JP11 and JP12: are fitted in RS232 position

Demonstration Applications

Menu overview

The Figure 2 shows all the menu and submenus of the demonstration applications.
Figure 2. Menu overview

The following sections provides a detailed description of each part of the demonstration firmware.

Welcome screen and main menu

After a board reset, a welcome message is displayed on the first line of the LCD screen, the ST logo is displayed moving on the second line (see Figure 3).
Figure 3. Welcome message

The main menu is then activated and the message shown in Figure 4 is displayed:
Figure 4. Main menu

Help mode

Pressing SEL from the main menu enters the Help mode. The following messages are displayed sequentially on the LCD screen with a few-second delay:
Figure 5. Help mode submenus

To exit this demo, press the joystick UP.

Calendar demo

The STM8L15x features a real-time clock (RTC) including an independent BCD timer/counter, time-of-day clock /calendar, a software programmable alarm, and a periodic programmable wakeup flag with interrupt capabilities that can be used to exit the device from Low power modes.
The calendar submenus allow to configure the system time, date and alarm.

Setting the time

The TIME submenu offers two options allowing to adjust and display the current time. Once set, the time is used to configure the RTC time.

Time adjust
Use the Time adjust option either to modify the current time, or to change the time to the current time after the STM8L1528-EVAL evaluation board is powered up.

1. To set the time, select the Time adjust option. The Time adjust submenu is then displayed to show the current time value. (see Figure 6).

2. Enter the first digit of the hour field:
   – Pressing the joystick UP increments the current digit value.
   – Pressing the joystick DOWN decrements the current digit value.
   The digit value is limited to a range depending on the time field (hours, minutes or seconds).

3. After selecting the digit value press SEL. The cursor then jumps automatically to the next digit.

4. When all the time digits are set, the Time adjust submenu is displayed again to show the current time. (see Figure 6).

Figure 6. Time adjust message

Time show
Select Time show to display the current time. The time start counter from (00:00:00) after the first run for the demo the time is cleared if the STM8L1528-EVAL evaluation board is powered down. The Time adjust option is used to configure the time.
When this option is selected, the following message is displayed on the LCD screen:

Figure 7. Time show message

To exit from the Time show submenu press the joystick UP.

Setting the date

The DATE submenu offers two options allowing to adjust and display the current date. Once set, the time is used to configure the RTC date.

Date Adjust
Use the Date adjust option to modify the current date, or to change the default date (09/17/2010) to the current date after the STM8L1528-EVAL evaluation board is powered up.

1. To set the current date, select the Date adjust option. The date is then displayed on 8 digits: MM/DD/YYYY (see Figure 8).

2. Enter the first digit of the month field:
   – Pressing the joystick UP increments the current digit value.
   – Pressing the joystick DOWN decrements the current digit value.
   The digit value is limited to a range depending on the date field (month, day or year).

3. After selecting the digit value press SEL. The cursor then jumps automatically to the next digit.

4. When all the date digits are set, the Date adjust submenu is displayed again to show the current date. (see Figure 8).

Figure 8. Date Adjust message

Date show
Select Date show to display the current date. After power-up, the default date (09/17/2010) is displayed till the Date adjust option is used to configure the current date.
The following message is displayed on the LCD screen when this submenu is selected:

Figure 9. Date Adjust message

To exit from this sub menu press the joystick UP push.

Setting the alarm

Use the ALARM submenu to configure the alarm seconds, minutes and hours.
This submenu offers two options allowing to display or adjust the current alarm.

Alarm adjust
The Alarm adjust option is similar to Time adjust.
After selecting Alarm adjust, or after setting the alarm, the message shown in Figure 10 is displayed.
Figure 10. Alarm Adjust message

Alarm show
Select the Alarm show option to display the current alarm. After power-up, the default alarm time (00:00:00) is displayed till the Alarm adjust option is used to enter a new alarm time.
The following message is displayed on the LCD screen when this submenu is selected:
Figure 11. Alarm show message

To exit from this sub menu press the joystick UP.

Note :

1. When an alarm occurs, the alarm wave is played.
2. The alarm can be used also to wake up the system from WFI or Active-halt.

Thermometer demo

The STM8L15x microcontroller has one embedded I2C peripheral that can be connected to any device supporting the I2C protocol including the system management bus (SMBus) mode. An STLM75 (or compatible devices) I2C temperature sensor is mounted on the STM8L1528-EVAL board and used to get instantaneous external temperature (–55°C to 125°C).
Once the THERMOMETER menu has been selected by pressing the SEL push-button, the message shown in Figure 12 is displayed on the LCD.
Figure 12. Thermometer message

Then the temperature value is displayed in Celsius as shown in Figure 13.
Figure 13. Temperature in Celsius message

When the joystick RIGHT is pressed the temperature in degrees Fahrenheit is displayed on LCD screen as shown in Figure 14 for two seconds then the temperature in degrees Celsius is displayed again.
Figure 14. Temperature in Celsius message

Thanks to STM8 I2C SMBus feature, we can easily monitor the temperature variations. This is managed by the SMBus Alert which is generating a dedicated interrupt informing the system that the temperature is out of the selected ranges. This is very useful when a higher temperature needs an emergency intervention like in a critical systems (motor control, medical…).
If the temperature exceeds the over-limit high (TEMPERATURE_TOS: Over Limit Temperature) the SMBus alert interrupt is generated and the following warning message as shown in Figure 15 is displayed on the LCD screen.

Figure 15. Warning Temperature display

The messages shown in Figure 15 is displayed on the LCD when the temperature goes under the over limit low (TEMPERATURE_THYS: Hysteresis Temperature).
The user can configure the TOS and THYS thanks to a dedicated define values in the code.
By default the STM8L1528-EVAL demo is setting them to (see demo_thermometer.c file):

define TEMPERATURE_THYS 31

define TEMPERATURE_TOS 32

To exit this demo, press the joystick UP.

Note : Any hardware trouble on the board with the temperature sensor is detected by a test. In this event, the message shown in Figure 16 is displayed.
Figure 16. Temperature sensor error message

IDD measurement demo

The STM8L15x microcontroller features an ADC peripheral. It measures the IDD current in Run mode by using the IDD measurement circuit available on the Root part number 1 board.

1. Select the IDD MEASUREMENT menu by pressing SEL from the main menu. The message shown in Figure 17 is then displayed on the LCD screen.
   Figure 17. IDD measurement message
   

2. Press SEL to display the current value of IDD in Run mode on the LCD screen (see Figure 18). IDD value is periodically refreshed.
   Figure 18. IDD Run mode message
   

Note : Make sure that the JP4 jumper is installed in the IDD position before running the IDD measurement demo.

Low power demo

The STM8L15x features five low power modes to achieve the best compromise between low power consumption, short startup time and available wakeup sources. The objective of the LOW POWER menu is to demonstrate how to enter the device in these low power modes and exit with different wakeup sources. Power consumption and startup time optimization are not targeted by this application.

Run mode

The RUN mode submenu demonstrates the behavior of an application running at different clock frequencies. The demo controls on-board LEDs that blink at the clock frequency. The current value of the clock frequency in Run mode is also displayed on the LCD screen (see Figure 19).
Figure 19. Run mode frequency message

The Run mode submenu contains four submenu items:

• 8 MHz: the application runs at 8 MHz.
• 4 MHz: the application runs at 4 MHz.
• 2 MHz: the application runs at 2 MHz.
• 16 MHz: the application runs at 16 MHz.
  Press SEL to select one of the listed Run mode clock frequency.
  Press UP to exit from the selected mode and return to the 16 MHz default clock frequency.

Wait for interrupt mode

This menu allows to put the STM8L15x in Wait for interrupt mode (WFI). The software executes the specific sequence of instructions required to enter WFI mode: the CPU clock is stopped, and selected peripherals go on running.
In this demonstration, there are two ways to exit from WFI mode:

• An external interrupt (EXTI) generated by pressing SEL on the joystick exits the STM8L15x from WFI mode:
  The LEDs blink until SEL is pressed from the WFI menu (see Figure 20). The system then enters WFI mode and the following message is displayed on the LCD:

Figure 20. WFI wait for EXTI message

The STM8L15x remains in WFI mode unless joystick SEL is pressed. The MCU then exits from WFI mode, the system clock frequency is set to 16 MHz, and the application execution resumes. The following message is displayed on the LCD screen:
Figure 21. Exit from WFI with EXTI message

Note : If an alarm occurs when the system is in WFE mode, it is delayed until the EXTI interrupt wakes up the device; then all LEDs are ON and a sound is played for ~10s.

• The RTC alarm is used to wake up the STM8L15x from WFI mode.
  The LEDs blink until SEL is pressed from the WFI menu (see Figure 22). The system then enters WFI mode and the following message is displayed on the LCD:

Figure 22. WFI wait for alarm message

When the alarm time is reached, the system exits from WFI mode, the system clock frequency is set to 16 MHz, and the application execution resumes. The message shown in Figure 23 is then displayed on the LCD screen:
Figure 23. Exit from WFI with alarm message

Wait for event mode

This menu allows to put the STM8L15x in Wait for event mode (WFE). The software executes the specific sequence of instructions required to enter WFE mode: the CPU clock is stopped, and selected peripherals go on running.
In this demonstration, there are two ways to exit from WFE mode:

• An external interrupt (EXTI) generated by pressing joystick SEL exits the STM8L15x from WFE mode.
  The LEDs blink until SEL is pressed from the WFE menu (see Figure 24). The system then enters WFE mode and the following message is displayed on the LCD:

Figure 24. WFE wait for EXTI message

The STM8L15x remains in WFE mode unless the SEL button is pressed. The MCU then exits from WFE mode, the system clock frequency is set to 16 MHz, and the application execution resumes. The following message is displayed on the LCD screen:
Figure 25. Exit from WFE with EXTI message

• A Comparator 1 interrupt can also exit the STM8L15x from WFE mode This interrupt is generated when the comparator non inverting input (connected to RV3) exceeds the internal reference voltage which is set to 1.22 V.
  The LEDs blink until SEL is pressed from WFE menu (see Figure 26). The system then enters WFE mode and the following message is displayed on the LCD:

Figure 26. WFE wait for comparator interrupt message

When Comparator 1 non inverting input exceeds the internal reference voltage, the system exits from WFE mode, and the application execution resumes. The message shown in Figure 27 is then displayed on the LCD screen:
Figure 27. Exit from WFE with comparator interrupt message

Note : If an alarm occurs when the system is in WFE mode, it is delayed until the occurrence of the wake up event; then all LEDs are ON and a sound is played for ~10s.

Active-Halt mode

This menu allows to put the STM8L15x in Active-halt mode. The software executes the specific sequence of instructions required to enter Active-halt mode: the CPU clock is stopped except for the RTC.
In this demonstration, there are two ways to exit from Active-halt mode:

• An external interrupt (EXTI) generated by pressing SEL on the joystick exits the STM8L15x from Active-halt mode:
  The LEDs continue blinking until SEL is pressed from the Active-halt menu (see Figure 28). The system then enters Active-halt mode and the following message is displayed on the LCD:

Figure 28. Active Halt wait for EXTI message

The MCU remains in Active-halt mode unless the SEL button is pressed. When SEL is pressed, the MCU exits from Active-halt mode, the system clock frequency is set to 16 MHz, and the application execution resumes.
The following message is displayed on the LCD screen:
Figure 29. Exit from Active-halt with EXTI message

Note : If an alarm occurs when the system is in Active-halt mode, it is delayed until the EXTI interrupt wakes up the device; then all LEDs are ON and a sound is played for ~10s.

• The RTC alarm wakes up the MCU from Active-halt mode.
  The LEDs blink until SEL is pressed from the Active-halt menu (see Figure 30). The system then enters Active-halt mode and the following message is displayed on the LCD.

Figure 30. Active Halt wait for alarm message

When the alarm time is reached, the system exits from Active-halt mode, the system clock frequency is set to 16 MHz, and the application execution resumes. The message shown in Figure 31 is displayed:
Figure 31. Exit from Active-halt with alarm message

Halt mode

This menu allows to put the STM8L15x in Halt mode. The software performs the specific sequence of instructions required to enter Halt mode: the CPU and peripheral clocks are stopped, and the device remains powered on.
In this demonstration, there are two ways to exit from halt mode:

• An external interrupt (EXTI) generated by pressing SEL on the joystick exits the STM8L15x from halt mode:
  The LEDs blink until SEL is pressed from Halt menu. The system then enters halt mode and the following message is displayed on the LCD:

Figure 32. Halt wait for EXTI message

The STM8L15x remains in Halt mode unless the SEL button is pressed. The MCU then exits from Halt mode, the system clock is set to 16 MHz, and the application execution resumes. The following message is displayed on the LCD:
Figure 33. Exit from Halt with EXTI message

• A Comparator 1 interrupt can also exit the STM8L15x from Halt mode This interrupt is generated when the non inverting input exceeds the internal reference voltage.
  The LEDs blink until SEL is pressed from the Halt menu (see Figure 34). The system then enters Halt mode and the following message is displayed on the LCD:

Figure 34. Halt wait for comparator interrupt message

When Comparator 1 non inverting input exceeds the internal reference voltage, the system exits from Halt mode, and the application execution resumes. The message shown in Figure 35 is then displayed on the LCD screen:
Figure 35. Exit from Halt with comparator interrupt message

Audio demo

Voice recorder demo

The STM8L15x microcontroller features timers and an ADC which can be used respectively for timing and signal acquisition.
In this demo, Timer 1 (TIM1) is used to generate an update interrupt every 45.35 µs (22.05 kHz), which corresponds to the voice sampling period. This update event triggers the ADC voice acquisition. Voice data is saved on the on-board SPI Flash memory.
When the Voice Recorder is selected from the AUDIO menu by pressing SEL on the joystick, the following message is displayed on the LCD screen:
Figure 36. Start voice recorder message

This message remains displayed until SEL is pressed. The STM8L15x then starts erasing the voice data previously stored on the on-board Flash memory. The message shown in
Figure 37 remains displayed until the erase operation is complete.
Figure 37. Erase Flash message

When the erase operation is complete, the message shown in Figure 38 is displayed:
Figure 38. Voice recorder message

When SEL is pressed, the STM8L15x starts recording voice and the displays the message shown in Figure 39:
Figure 39. Stop voice recorder message

To stop recording, press the joystick UP, otherwise the STM8L15x will stop recording automatically after 30 s and the message shown in Figure 40 will be displayed:
Figure 40. End voice recorder message

Voice player demo

The STM8L15x microcontroller features an embedded DAC which can be used to generate output signals.
In this demo, the DAC regenerates the voice signal recorded in the SPI Flash memory.
Timer 4 (TIM4) triggers the DAC to generate the voice signal every 45.35 µs (22.05 kHz) which corresponds to the voice sampling period.
When the Recorded voice is selected from the Audio Player submenu by pressing the SEL on the joystick, The following message remains displayed unless SEL is pressed.
Figure 41. Audio Player menu message

When SEL is pressed, the STM8L15x starts playing the voice, and the message shown in Figure 42 is displayed.
Figure 42. Play voice recorded message

At first time when running the recorded voice demo, the STM8L15x check for the existence for a record in the external SPI Flash memory and play it, otherwise the message shown in
Figure 43 is displayed for two seconds then voice player menu is displayed again.
Figure 43. No recorded voice message

To stop the voice player demo, press the joystick UP. The message shown on Figure 41 is then displayed. Otherwise, the STM8L15x will stop automatically at the end of the wave.

Wave player demo

The STM8L15x microcontroller has an embedded DAC which can be used to generate output signals.
In this demo, any wave file stored under the USER folder in the microSD card can be opened using the file system PetitFatFS and transferred to the internal RAM by block (512 bytes) using the DMA and the SPI interface. Timer 4 (TIM4) triggers the DAC to generate the wave signal. The voice sampling period is read from the Wave File Header. An audio amplifier is connected to the DAC interface to play the stored wave files. This demo reads all wave files from “USER” directory and displays only the .WAV files having the following format:

• Audio Format: PCM (an uncompressed wave data format in which each value represents the amplitude of the signal at the time of sampling.)
• Sample rate: may be 8000, 11025, 22050 or 44100 Hz.
• Bits Per Sample: 8-bit (Audio sample data values are in the range [0-255]).
• Number of Channels: 1 (Mono)

The maximum wave files number that can be read from the microSD card is 3 files selected by alphabetic order.
When the Stored wave is selected from the Audio Player submenu by pressing the SEL on the joystick, The following message remains displayed unless SEL is pressed.
Figure 44. Stored wave message

When SEL is pressed, the system checks if an SD card memory is available in the connector CN15. If there is no card detected, the Stored Wave demo will not start and the message shown in Figure 45 is displayed on the LCD for two seconds then the Audio Player submenu is displayed again.
Figure 45. Stored wave message

Otherwise, if SD card is detected in the connector CN15 the available wave interface is displayed as shown in Figure 46.
Figure 46. Available wave message

At this application level, pressing:

• the SEL push-button starts playing the selected wave
• the UP push-button exit the submenu
• the LEFT push-button decrements the wave index
• the RIGHt push-button increment the wave index

Once the play command is prompted, the submenu shown in Figure 47 is displayed.
Figure 47. Play wave message

When the audio stream is paused, the menu in Figure 48 is displayed.
Figure 48. Pause wave message

To resume playing, press the SEL push-button and the menu shown in Figure 47 is displayed.
When the audio stream is stopped, the stream position is reset and the menu shown in Figure 44 is displayed.
Note : If the SD card is removed, the demo will stop and the LCD screen displays the message shown in Figure 49 for two seconds. Then the Audio Player submenu is displayed again.
Figure 49. SD card removed message

About menu

This menu shows the firmware version. When this submenu is selected the message shown in Figure 50 is displayed on the LCD screen:
Figure 50. Displaying the demonstration firmware version

Press the joystick UP to exit this menu.

Upgrading The Demonstration Firmware

Programming the media files

The STM8L1528-EVAL board comes with an MicroSD card memory preprogrammed with audio resources used by the demonstration. However you can load your audio (*.wav) files in the “USER” directory, providing that these file formats are supported by the demonstration. For more details please refer to Section 3.8.3: Wave player demo on page 19.
Figure 51. SD card directory organization

The default content of the media files (USER directory) is located in the Binary\Media folder.
To reprogram the MicroSD card, simply copy the content of the Binary\Media folder to your own SD memory.

Programming the demonstration

To upgrade the demonstration firmware running on your board, perform the following steps:

1. Download the latest version of STM8L1528-EVAL demonstration firmware and related user manual from www.st.com/mcu.
2. Extract the content of the downloaded zip file to the directory of your choice.
3. Power on the STM8L1528-EVAL board and connect it to the debug instrument.
4. Select the folder corresponding to your preferred toolchain (STVD, EWARMv6 or RIDE).
5. Open the project and rebuild all sources.
6. Load the project image through your debugger.
7. Restart the evaluation board (Press B1: reset button).

Note : You can also load a binary file of the demonstration firmware (.hex) by using the STVP toolchain (refer to the STVP online help for details). The binary file is available under \STM8L1528-EVAL_FW\Utilities\Binary.

STM8L15x Peripherals Used

Table 2 lists the STM8L15x peripherals used in each demo.

Table 2. Peripherals used

Revision History

Table 3. Document revision history

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