Hi,
I would like to reprogram a MK20DX64VLH7 microcontroller that I have in a board with , but I haven´t been able to download the new firmware and erase a previous firmware that I´ve just download before succesfully. In the monitor it appears the next message: "Device is secure. Erase to ensecure?". I repetedly choose "Yes" but without any success, until the next message appears: "Launching LED Debug (4) has encountered a problem. Error in services launch sequence". In details appears written: "Error in services launch sequence Timed out trying to launch GDB Server."
I use KDS application, and "Debug Configuration" Option and GDB PEMicro with "Multilink Universal" programmer.
I´ve followed the KDS User Guide in order to set Debug Configurations.
Maybe there is one problem with the secure configuration of microcontroller, but I don´t know.
How can I erase the flash memory to reprogramm again?
I didn´t program the 0x40C address related to "NV_SEC" because I´ve only done the tutorial from Processor Expert, but I don´t know if this application program this address (0x40C) by default when I choose "Generate Processor Expert Code".
Anyway I tell you that it appears in this this address in my application:
NV_SEC (Address: 0x40C):
Init. value. 7E
After reset. FF
whose bits are:
KEYEN bits:
Init. value. 01
After reset. 11
MEEN bits:
Init. value. 11
After reset. 11
FSLACC bits:
Init. value. 11
After reset. 11
SEC bits:
Init. value. 10
After reset. 11
I don´t know how I can access to these registers by the "Processor Expert Application".
I would like to know how I could erase the firmware loaded in the MK20DX64VLH7 microcontroller to be able to reprogram it, as well as reprogramming in unsecure mode in order not to have this problems again. Or to program a firmware erasing the firmware loaded before. Do you know if there are any application to manage this. I have used "pe_gdb_server" and "multilink_universal" applications before but without any success.
Moreover I didn´t check a box to secure. The security boxes from the flash are disable by default and Protection regions are unprotected in Component Inspector Properties in the "Processor Expert Application" in KDS.
According to this I think there shouldn´t be any problem with accesses related to security.
I will continue researching.
Thanks previouslly for your answer.
your sincerelly,
Arturo Arteaga
Hi Arturo Arteaga,
You don't need to install the plugin to add the breakpoints.
When you add the breakpoints, just with the tick sign, it is the useful break points:
Please check it on your side.
Have a great day,
Kerry
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Hi Arturo Arteaga,
You post this picture before:
Please write these code
before
:
You add break point in for{;;}, are you sure your while(AS1_GetTxCompleteStatur(..)==false) is executed?
I just want to make sure your code is not blocking before your break points.
Have a great day,
Kerry
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Hi Arturo Arteaga,
1. UART_D is the data register,
This register is actually two separate registers. Reads return the contents of the read-only
receive data register and writes go to the write-only transmit data register.
2. I think it may caused by your clock.
You can send data 0x55, then use the oscilloscope to check the UART TX pin in the MCU, check the bit rate, is it really 115200?
If you test the bit, it is 115200(the details value in the baud rate, may 11522x), then it may caused by your UART to PC converter.
If your test bit rate is not 115200, you need to check your bus clock, because UART2 is using the bus clock. bus clock is not accurate will cause the uart rate is not accurate.
I find your project use the external crystal 16Mhz, you also can try internal clock.
I have modify your project, use UART1 PTE1, PTE0 as the UART pin, and the internal slow IRC as the clock source, I can get the correct data with my TWR-K20D72M board.
I attached the project for your reference.
I send the test, you can find I get the correct data.
Have a great day,
Kerry
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