How to jump to other program work // LPC51U68

[陈欣]

At present, I want to put FLASH of LPC51U68 into two pieces of code, A and B, respectively.

Section A code is put in 0~0x7FFF address, and section B code is put in 0x8000~0x40000.

When the power is on, it will run A code, then jump to B code, but when it jumps to B code, it can not run B code properly.

What do I need to do with Section B code to ensure that I can execute Section B code normally when I jump from A to B?

[ZhangJennie]

Hi chen xin 

In order to jump from A code to B, you need

1. deinitialize the used module

2. set stack.

3. set B code entry address. then jump.

As a reference. I recommend you check AN12037. inside, there is bootloader demo code. We can think A as bootloader and B as app.

Below is what MCU does before jump from bootloader to app.see function doCleanBoot()

For more, please see AN12037, you can search it from NXP site easily.

Have a great day,
Jun Zhang

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[陈欣]

Thank you very much for your answer. I'll try it later. Thank you.

[ZhangJennie]

you are welcome.