Automotive multimedia system testing
Technical solution for functional testing of Power board, Video board and LCD board
1. Design goals
This solution is intended to be used in the functional test project of the customer's "Power board, Video board and LCD board". In this scheme, the SRC connection function test system is built according to the specific functional requirements and technical index requirements of customers. To meet the expected needs of customers, in order to achieve the purpose of rapid and accurate detection.
2. Design basis
| serial number |
The project |
Specific parameter requirements | Total demand routes/simultaneous demand |
| 1 |
circuit board connection |
Connect the Power board, Video board and LCD board together through probe wires to form a test system unit. |
(80+22+50)*2+12+8+40+10+12+22 adapter board (the connection line between the LCD board and the display should be as short as possible, and an adapter board should be used, and the adapter board should be connected to the LCD board Connected by manual plugging of flexible cables) |
| 2 | Auxiliary connection | The auxiliary accessories such as "DVD optical drive, CAMERA, U disk, SD card, fan, multi-function steering wheel simulation unit" required by the system under test are connected to the system under test by means of the probe connection to the connector. Complete physical connections for partial functional testing. (You need to know the physical connection relationship between each auxiliary test accessories and the system under test in detail, interface definition, etc., in order to provide accurate system connection) FM, AM, GPS signals are connected to the board under test through high-frequency probes. |
When the FMAM and GPS signals cannot meet the test requirements of the high-frequency probe, the cylinder is used to push the structure to realize the quick connection of the signal line. |
| 3 | power supply | Voltage output range 0~18V, current supply capacity ≤3A; (simulated car battery) | 1/1 |
| 4 | Voltage measurement | Power board, Video board and LCD board key voltage point test. Voltage range: 0~24V; voltage accuracy: better than 0.5% |
21+26+12/1 |
| 5 | CAN communication |
Carry out data communication based on CAN physical connection with the MCU on the power board of the tested board. |
2/2 |
| 6 | LIN Bus communication test | Carry out data communication based on LIN Bus physical connection with the MCU on the power board of the board under test. (Customers need to provide physical layer definition and communication protocol.) | 1/1 |
| 7 | Simulate keys | The buttons on the multi-function steering wheel are simulated by relays, replacing the action of manually pressing the buttons. (Need to understand the physical connection between the multi-function steering wheel and the system under test) | Multiplex/1 |
3. Test project
3.1 DVD function test: Automatically judge the quality of DVD by automatically clicking the DVD play button, and then analyzing whether there is sound through the audio analyzer.
3.2 Rear vision and night vision function test: The rear vision function test is triggered and prompted by the CAN command of the test system, and the night vision function test is prompted by the test system. Click the Tooling button) to test the system.
3.3 MIC test (voice assistant test): By means of the test system prompt, the test system plays the recorded voice through the speaker, manually detects the response on the LCD screen, and feeds back the result (NG or Good) to the test system.
3.4 Version detection: The version detection of the board under test is realized through CAN commands.
3.5 HDD test: The test to detect HDD through CAN communication.
3.6 Lin Bus communication test: start the LIN test of the board under test through CAN communication, receive the data sent by the board under test through the LIN transceiver, and the software will judge the data.
3.7 Fan test: Start the fan test of the board under test through CAN communication, read back the data through CAN communication, and the software will judge the data.
3.8 Temperature detection: Start the temperature test of the board under test through CAN communication, and read back the temperature data through CAN communication; the readback temperature is considered correct within a certain range.
3.9 Multi-function steering wheel button test: The multi-function steering wheel is simulated in the form of resistance and switch. The test system starts the multi-function steering wheel button test of the board under test through CAN communication, reads back the button data through CAN communication, and compares it with the actual button.
3.10 SD Card reading and writing test: start the SD Card reading and writing test of the board under test through CAN communication, read back the data through CAN communication, and the software will judge the data.
3.11 FM, AM test: control the FMAM signal generator to generate the specified frequency, start the test of the board under test and the test of playing the specified radio station through CAN communication, and judge whether the test is correct by analyzing the presence or absence of sound through the audio analyzer. FM frequency is 999 and AM frequency is 1999.
3.12 WIFI, BT function test: The test system is equipped with a WiFi hotspot, the test system starts the WIFI test of the board under test through CAN communication, the board under test is connected to WiFI according to the configuration in the SD, the data is read back through CAN communication, and the software judges the data. The test system is equipped with an Android mobile phone for auxiliary testing, which is manually set to the specified music loop playback and Bluetooth open mode. The system starts the Bluetooth test of the board under test through CAN communication. The board under test performs Bluetooth pairing according to the configuration in the SD. After connecting to Bluetooth, it reads the status of the Bluetooth connection of the tested product, and the system automatically judges.
3.13 Touch screen, button/knob test: test system prompts, manually assist to complete screen sliding test and knob test. The test system starts the test of the board under test through CAN communication, manually judges the test results, and feeds the results (NG or Good) to the test system (click the tooling button).
3.14 LCD screen test: The test system prompts to complete the LCD screen test with manual assistance. Feed back the result (NG or Good) (click the tooling button) to the test system.
3.15 Dimmer brightness test: test in LCD screen test.
3.16 AMP GPIO test: Read the waveform data through the oscilloscope to determine whether the duty cycle of the waveform data is within a certain range.
3.17 USB audio playback test: Start the USB audio playback test through the CAN command, and use the audio analyzer to determine the presence or absence of sound.
3.18 GPS test: manually set the GPS signal generator, or use the GPS signal that already exists in the factory, receive the GPS signal through the GPS receiving antenna on the device, read back the time through CAN communication, and compare the readback time with the computer system time. judge. The GPS signal antenna adopts the automatic docking method. If the method is unreliable, the docking method is manually inserted and pulled out.
3.19 Power detection: automatic detection by multimeter
