/*!
\file readme.txt
\brief description of erase and program flash example with TZEN=1
\version 2021-10-30, V1.0.0, firmware for GD32W51x
*/
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This example is based on the GD32W515P-EVAL-V1.0 board, the project consists of
two sub-projects, secure project and nonsecure project. It shows how to switch from
secure application to non-secure application, and call secure functions in nonsecure
application. The gd_eval_leds_init function is defined in non-secure callable area
in secure application, and is called by nonsecure application.
The system always starts from the secure application, and the secure application is
responsible for starting the nonsecure application.Therefore, in the compilation process,
first compile the secure project, and then compile the nonsecure project
Before downloading the program, the option byte needs to be configured as follows:
1.enable trustzone
TZEN = 1
2.configure secure mark pages
FMC_SECMCFG0 = 0x003F0000
startpage :0x00 endpage:0x3F means that the first 64 pages of flash are configured
as secure
In secure application,the program execution follows the following steps:
1.configre SAU/IDAU, FPU and secure/nosecure interrupts allocations in
partition_gd32w51x.h file the key configuration is as follows:
Enable SAU
SAU Region 0 start address: 0x0C03E000 end address: 0x0C03FFFF Attributes: S/NSC
SAU Region 1 start address: 0x08040000 end address: 0x081FFFFF Attributes: NS
SAU Region 2 start address: 0x20010000 end address: 0x2001FFFF Attributes: NS
SAU Region 3 start address: 0x40000000 end address: 0x4FFFFFFF Attributes: NS
2.configure TZBMPC
TZBMPC1 vector register y(y=0 to 7):0x00000000 means that SRAM1(64KB) are configured
as nonsecure
3.Erase and program data to secure flash and check whether the secure flash memory has been
correctly programmed. If the result is right, LED1 will be on.
4.Configure and jump to non-secure application
In non-secure Application :
1.Call NSC area function gd_eval_leds_init to initliaze leds.
2.Erase non-secure flash and check whether the non-secure flash memory has been correctly erased.
If the result is right, LED2 will be on.
3.Program data to secure flash and check whether the secure flash memory has been correctly
programmed. If the result is right, LED3 will be on.
