Hi Yavuz,
if you have only one batt-14cemulator for all channels, then the Modul voltages will be the same. The software engineer has tested two batt-14cemulators. One for one channel and the other one for the other three channels. The fourth channel is showing 40V, different than the other three 53.5V.
With Best Regards,
Jozef
Hi Yavuz,
I am terribly sorry. There is still no answer from the software engineer. I have just sent him a reminder and learned, that he is OOO (Out Of Office) till 31st of July. On the first of August I will send him another reminder. I apologize for this.
With Best Regards,
Jozef
Hi Yavuz,
good news. Finally the software engineer has provided the MATLAB example. Please find it attached. Please also see his answer below.
DESCRIPTION
I am sorry for my delayed response!
I was able to put together an example to read 4 battery cell controllers. Regarding the customer’s answer, because the MBDT uses the S32 Configuration Tools to generate the MCU peripherals configuration, it is a mix of what the customer assumed, meaning that both in S32CT need to specify the 4 BCC connected on the MC33665A and also the model needs to enumerate the devices, and then to address each of them. IN the next few bullets I will explain the settings, and also the steps.
- Specify the BCC devices number connected inside the S32CT
As it may be seen inside the settings below, the customer needs to specify the NumberOfConnectedBCCDevices to be 4 for the setup mentioned in the request, because we have 4 MC33775A connected.
- Adjusting the initialization sequence
Inside the model, there is an initialize function which is executed once at the beginning of the code execution. This function wakes up the battery pack, enumerates the devices ( this means that it assigns to each of them a Device ID, and also enables the measurements for each of the BCC devices. Now, I had to redesign this function in order to address all the BCCs and I have used some While Loops constructions in order to iterate through all the devices. So this was a required additional step in order to make sure that all the BCCs are enumerated and ready to be independently addressed by the CMU.
- Starting conversions
The main model also got changed in the way that for the Device Address now this uses a Stateflow Chard in order to iterate through the device addresses. We got the step time lower at 0.025 seconds, so each 25ms the CMU requests data from each of the BCC in a round robin circle.
The same StateFlow BCC ID is then passed to the second subsystem which places the measurement to the right location inside the Pack_Voltage data store memory.
- Testing
To test the model, I have connected a dedicated emulator for the BCC with the ID4 and checked the last one in the chain with different inputs.
I have checked the values using the FreeMASTER. Now BCC1 2 and 3 are connected to one emulator, while BCC 4 is connected to the other emulator.
Cell_Voltages [13], [27], and [41] are the 14th cell of the BCC 1 2 and 3 and they have the same value as 2.986 as might be seen below.
The Cell_Voltages[55] is the 14th cell of the BCC number 4 connected to the second emulator, and it might be seen, this has the 4.1 Volts.
The difference might also be seen in the Module_Voltage, because the Module_Voltage[0] [1] [3] has 53.5 Volts, while the last one has 40 Volts.
To this e-mail, I have attached an archive, containing the model, mex of the S32CT configuration file, the generated .elf file and some additional files required by the Simulink model.
With Best Regards,
Jozef
Hi Yavuz,
if you have only one batt-14cemulator for all channels, then the Modul voltages will be the same. The software engineer has tested two batt-14cemulators. One for one channel and the other one for the other three channels. The fourth channel is showing 40V, different than the other three 53.5V.
With Best Regards,
Jozef
Hi Yavuz,
great, I am glad that you have solver the module voltages issue. Thank you for letting me know. Please clarify, which temperature you want to read. Internal IC temperature?
Or external temperature via the NTC resistors to GPIO pins?
With Best Regards,
Jozef
Hello Yavuz,
please see below an answer from the software engineer.
DESCRIPTION
As a guideline, we can suggest the customer do the following:
- To enable the GPIO measurements for the analog inputs I think first this must be specified inside the MC33775 Component of the S32 Configuration Tools as in the image below:
- Both the primary chain and the secondary chain are converted in the MBDT example so in order to get internal temperature and the AIN results customer needs to retrieve from the correct location index these values, using the TD Handler block.
Inside the model, we could see here below, where the CHAINS GetData blocks are used. Now they are returning the requested registers inside the TD Handler.
So inside the If action subsystem we are extracting at index 25 the voltage of the cell 14 and the pack voltage, as it could be seen below.
So in order to extract the internal temperature and the voltages from the GPIOs the following indexes needs to be extracted.
- index 37, register 1873h PRMM_PER_PRMTEMP
- index 58, register 1c73h SECM_PER_SECTEMP
- index 30, register 186Fh PRMM_PER_AIN0
- index 31, register 1870h PRMM_PER_AIN1
- index 32, register 1871h PRMM_PER_AIN2
- index 33, register 1872h PRMM_PER_AIN3
- index 51, register 1C6Fh SECM_PER_AIN4
- index 52, register 1C70h SECM_PER_AIN5
- index 53, register 1C71h SECM_PER_AIN6
- index 54, register 1C72h SECM_PER_AIN7
With Best Regards,
Jozef
