Interview Questions
 |
| automotive validation engineer capl programming questions |
CAPL Programming Questions:
1. ECU shall check BS_State == INIT within x sec after DWS is on.
If the condition is not met:
a) ECU shall go to Failure state.
b) ECU shall reset EU_Request to 0.
Answer:
includes
{
}
variables
{
msTimer timer;
}
on timer event Timer
{
// If the timer expires and the condition is not met, go to a Failure state
if (BS_State != INIT)
{
setECUState(Failure);
EU_Request = 0;
}
}
on signal DWS
{
// If DWS is turned on, start the timer
if (DWS == 1)
{
setTimer(timer, x * 1000); // x is the timeout in seconds
}
}
Explanation:
The script uses a timer to check if the condition is met within x seconds after DWS is on. When the DWS signal is received and its value is 1 (meaning it's turned on), the script starts the timer with a timeout of x seconds. If the timer expires before the condition is met (i.e., BS_State is not INIT), the script goes to Failure state and resets EU_Request to 0.
Note that you need to define the Failure state and the EU_Request variable somewhere else in your CAPL program. The setECUState() function and the setTimer() function are built-in functions in CAPL.
2. If Event - Press Key 'A' then Send message 0x28 periodically for every 75ms and Event - Press Key 'B' Stop sending a message.
Answer:
includes
{
}
variables
{
message signal_1 msg1;
msTimer t;
}
on key 'A'
{
setTimer(t,75);
}
on timer t
{
msg1.signal_1=0x28;
output(msg1);
setTimer(t,75);
}
on key 'B'
{
cancelTimer(t);
}
}
3. Write a CAPL program to store each log file.
Answer:
includes
{
}
variables
{
int message_counter = 0;
char filename[100];
}
on message CAN_Std(msg)
{
message_counter++;
sprintf(filename, "message_%d.log",message_counter);
}
}
4. Write a CAPL program to read the DID value as 1010 and display the value. after that overwrite with another DID value and display the overwritten value?
Answer:
includes
{
}
variables
{
// Declare a variable to store the DID value
word didValue;
}
on preStart
{
// Read and display the initial DID value
didValue = 1010; // Replace this line with your method to read the DID value from the CAN network
write("Initial DID Value: %d", didValue);
// Overwrite the DID value with a new value (e.g., 2020)
didValue = 2020;
// Display the overwritten DID value
write("Overwritten DID Value: %d", didValue);
}
5. Write a CAPL program to unlock the ECU if the tester key value and server key values match the ECU locked.
Answer:
includes
{
}
variables
{
dword tester_key = 0x12345678; // replace with actual tester key value
dword server_key = 0x87654321; // replace with actual server key value
bool is_ecu_unlocked = false; // flag to keep track of ECU unlock status
}
on key_received()
{
dword received_key = this.messageDataLong(0); // get the key value from the message
if (received_key == tester_key && received_key == server_key)
{
// unlock ECU
write("UNLOCK_ECU"); // replace with actual unlock command
is_ecu_unlocked = true; // set flag to indicate ECU is unlocked
write("ECU unlocked"); // log success message
}
else
{
// lock ECU
write("LOCK_ECU"); // replace with actual lock command
is_ecu_unlocked = false; // set flag to indicate ECU is locked
write("ECU locked"); // log failure message
}
}
on start
{
write("ECU lock status: %d", is_ecu_unlocked); // log initial ECU lock status
}
6. Develop the CAPL script for continuous voltage value once turn on the ECU and once the voltage value is reduced to 1.5 and the LV maintenance coming to the picture closes the lv reaches more than 13.5 then it maintenance lv value mechanism.
Answer:
includes
{
}
variables
{
// Declare variables to store voltage and LV maintenance status
float voltageValue;
byte lvMaintenanceStatus;
}
on start
{
// Initialize variables
voltageValue = 0.0; // Set an initial value for voltage
lvMaintenanceStatus = 0; // 0 = LV Maintenance not active, 1 = LV Maintenance active
}
on message voltageSignal
{
// This event is triggered whenever a new voltage signal is received
// Update the voltageValue with the received value
voltageValue = this.VoltageSignal; // Assuming the signal contains the voltage value in the message
// Check if the voltage is reduced to 1.5
if (voltageValue <= 1.5)
{
// Trigger the LV maintenance mechanism (e.g., by setting the lvMaintenanceStatus to 1)
lvMaintenanceStatus = 1;
}
// Check if the voltage is more than 13.5 and LV maintenance is active
if (voltageValue > 13.5 && lvMaintenanceStatus == 1)
{
// Perform the LV maintenance action (e.g., send a specific CAN message)
// Replace the line below with the appropriate function to send the LV maintenance message
SendLVMaintenanceMessage();
// Reset the LV maintenance status to 0 as the maintenance action is performed
lvMaintenanceStatus = 0;
}
}
on stop
{
// Perform any necessary cleanup or actions before stopping the script
}
// Function to send the LV maintenance message
void SendLVMaintenanceMessage() {
// Implement the logic to send the LV maintenance message here
// This function will be responsible for sending the CAN message when voltage > 13.5 during LV maintenance
// You need to know the exact CAN message format and its associated CAN ID, DLC, and data bytes
}
0 Comments