NXP Semiconductors LPC CM0 Series User manual

LPC CM0 Safety Example
NXP Semiconductors Document identifier: IEC60730BLPCCM0EUG
User's Guide Rev. 3, 07/2021

Contents
Chapter 1 IEC60730B Safety library example user's guide...................................3
Chapter 2 Hardware settings................................................................................. 4
Chapter 3 File structure......................................................................................... 8
Chapter 4 Example application............................................................................ 10
Chapter 5 Running example................................................................................ 14
Chapter 6 IEC60730B tests................................................................................. 24
Chapter 7 Revision history...................................................................................27
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Chapter 1
IEC60730B Safety library example user's guide
For easier development of the IEC60730B application, the library also provides the example code. This example is distributed
through the MCUXpresso SDK website. This example user's guide describes how to set the hardware correctly and how to use
the example code with the IEC60730B Safety library.
The library user's guide is the main documentation for IEC60730B. It is also part of this package and you can download it at
www.nxp.com/IEC60730.
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Chapter 2
Hardware settings
This chapter describes how to set up the hardware of the evaulation board. The MCU peripherals' setup is described later on.
The IEC60730B library example for the LPC CM0 family supports the following development boards:
• LPCxpresso51U68
• LPCxpresso845Max
• LPCxpresso824Max
To run the IEC60730B example application, it is neccessary to make some hardware settings. For the default configuration of your
development board, see the corresponding board's user manual at www.nxp.com.
2.1 LPCXpresso824MAX
Debugger:
To use the on-board debugger, make sure that jumper JP1 (next to the USB connector) is open. Short this jumper to use an
external debug connector.
The default debugger in the example project is set to CMSIS-DAP.
FreeMASTER
FreeMASTER communication is used via an onboard debugger with a speed of 9600 bd.
The ADC module on LPCXpresso824MAX does not allow to connect the VrefH, VrefL, and Bandgap internally to the ADC input.
Connect these signals (for the Analog I/O test) as follows:
• VrefH - 3.3 V on PIO0_21(conn. J5-5).
• VrefL - GND on PIO0_20 (conn. J5-6).
• Bandgap - connect a custom reference (for example 1.65 V) to PIO0_22 (conn. J5-4). The expected value of the custom
bandgap can be set in the
safety_config.h file (#define ADC_BANDGAP_LEVEL 1.65).
An example of the corresponding connection is shown in Figure 1.
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Figure 1. Hardware connection of LPCXpresso824MAX
In Figure 1, an external debbugger is used. Due to this, jumper JP1 is shorted. The test voltage of 1.65 V is provided by a resistor
voltage divider from the VCC (3.3 V).
To use FreeMASTER, ensure that solderjumper SJ9 is set to position 2-3 (default is 1-2). For more information,
see the LPCXpresso824MAX schematic at www.nxp.com.
NOTE
2.2 LPCXpresso845MAX
Debugger:
To use the on-board debugger, make sure that jumper JP1 (next to the USB connector) is open. Short this jumper to use an
external debug connector.
The default debugger in the example project is set to CMSIS-DAP.
FreeMASTER
FreeMASTER communication is used via an onboard debugger with a speed of 9600 bd.
The ADC module on LPCXpresso845MAX does not allow to connect the VrefH, VrefL, and Bandgap internally to the ADC input.
Connect these signals (for the Analog I/O test) as follows:
• VrefH - 3.3 V on PIO0_23 (conn. J6-2).
• VrefL - GND on PIO0_14 (conn. J6-1).
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• Bandgap - connect a custom reference (for example 1.65 V) to PIO0_19 (conn. J6-3). The expected value of the custom
bandgap can be set in the safety_config.h file (#define ADC_BANDGAP_LEVEL 1.65).
An example of the corresponding connection is shown in Figure 2.
Figure 2. Hardware connection of LPCXpresso845MAX
In Figure 2, the external debbugger is used. Due to this, jumper JP1 is shorted. The test voltage of 1.65 V is provided by a resistor
voltage divider from the VCC (3.3 V).
2.3 LPCXpresso51U68
Debugger:
To use the on-board debugger and power the board via USB, make sure that jumper JP2 is set to "Loc". Then connect the USB
to connector J6.
The default debugger in the example project is set to CMSIS-DAP.
If downloading to the device does not work, press and hold the SW3 button during the download.
NOTE
FreeMASTER
FreeMASTER communication is used via an on-board debugger with a speed of 9600 bd.
See the LPCXpresso51U68 development board User Manual (document UM11121) for more details.
The ADC module on the LPCXpresso51U68 does not allow the VrefH, VrefL, and Bandgap to connect internally to the ADC input.
Connect these signals (for the Analog I/O test) as follows:
• VrefH - connect VCC to PIO_0_30 (J8-2).
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• VrefL - connect GND to PIO_0_29 (J2-5).
• Bandgap - connect a custom reference (for example 1.65 V) to PIO_0_31 (J2-17). The expected value of the custom bandgap
can be set in the safety_config.h file (#define ADC_BANDGAP_LEVEL 2.5).
Figure 3. Hardware connection of LPCXpresso51U68
The test voltage of 2.5 V is provided by a resistor voltage divider from the VCC (5 V).
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Chapter 3
File structure
Safety is only a small part of the whole SDK package for your device. The IEC60730 library and examples are located in the
middleware and in the board folders. The IEC60730 library is independent of the SDK and can be used stand-alone.
3.1 Library source files location
The library source files are in the middleware/safety_iec60730b/safety/v4_2 folder in the SDK package.
The folder has the following structure:
Figure 4. Folder structure
Where:
• The
common_test folder contains the source files for the peripheral test – this is a common cross core. These tests are
compiled to library libIEC60730B_<core>_COM_<compiler>_<version>.a .
• The compiler folder contains compiler support files.
• The
core_test folder contains the source files for the core-dependent test. These tests are compiled to library
libIEC60730B_<core>_<compiler>_<version>.a .
• iec60730b.h is the main library header file.
•
iec60730b_types.h is the header file with the necessary defines for the library.
The folder also contains binary *.lib files, which are compiled for the IAR, Keil, and MCUXpresso IDEs (see the release notes
for details).
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3.2 Example of library handling code
The library-handling code and the example aplication are separate from the library file. The example source files and other SDK
examples are at this path:
boards/<your board>/demo_apps/safety_iec60730b/
The safety example code is shown in Figure 5.
Figure 5. Example of project structure in example folder
This folder contains the example source file and three folders for the IDE project file:
•
iar
• mcux
• mdk
The following files are generated by the MCUXpresso configuration tool:
• clock_config.h
• clock_config.c
• pin_mux.c
• pin_mux.h
Other files are used only for safety examples and their contents are described in the next chapter.
Example of library handling code
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Chapter 4
Example application
The structure of the example is common in all supported IDEs (IAR, Keil, MCUXpresso).
Figure 6. IAR example application structure
The project contains the CMSIS, SDK, library, and safety example-related folders.
The safety-related folders are the following:
•
Board – this folder contains the files related to the board used ( clock_config.h , pin_config.h , board.h , and so on).
• CPU – this folder contains the startup code and vectors table.
•
IEC60730_Class_B – files for the IEC60730B Safety library.
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