Work Distributing

1. Background project:

Thanks for helping of Mr.Toan, we have understood generally Bootloader project.

Flow chart of Project

In general, project will have 2 modes: User application mode and Boot mode. We

can select mode by read level of Sw1.

If Sw1 is 1, then Boot mode is selected, in this mode, boot file will receive

S19 file through UART then write to expected address on Flash.

If Sw1 is 0, then User application mode is selected, we need to check at that

address has data (?), if data is already written (value at address !=

0xFFFFF..FF), then it will start to process (blink led for example).

We will create a project with the following modules:

1.1 User application:

Create a simple user application and encode to S19 file (Figure 1), note that

we can define which address of user code is saved on RAM of board

KL46Z (Figure 2).

Figure 1

Figure 2

1.2 UART module:

UART terminal will send file (s19 file), we need to create a small module

which send a text file then check at receiver by reading buffer.

1.3 Flash module (read and write to FLASH)

We will re-use the sample code, or modify, depend on our ability, to read or

write to an address. We can check the value at that address after writing by

read value of a pointer which point to that address:

Ex:

#define ADD_TO_READ 0xA010

uint_32 * p = NULL;

p = (uint_32 *) ADD_TO_READ; // point p to this

address

value = *p; // read value at that address

1.4 Jump SP to a defined address on Flash:

We need to check that SP jumps to expected address? We can read address

of SP and compare to expected address; if they are equal, then true else

false.

2. Future plan:

After successfully process in each module above, then we will combine to project

by writing a boot file (boot mode) which will contains both 3 modules (UART

interface, Flash write module, and jump SP to expected address). It will receive

S19 file through UART and write to Flash at expected address then jump SP to

this address.