/*!
\file readme.txt
\brief description of led spark 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 between
secure application and non-secure application. The led1_spark function is defined in
non-secure callable area in secure application, and is called by nonsecure application.
The led2_toggle function is defiend in nonsecure application, and is called by
secure application.
The system always starts from the secure application, and the secure application is
responsible for starting the nonsecure application.
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.initialize led and key, and configure gpio of led2 as nonsecure atrribute.
4.configure and jump to non-secure application
In nonsecure application, by calling NSC area functions secure_led_spark and
entry_cb_func_register, the LED1 is sparking and when KEY_TAMPER_WAKEUP key is pressed,
LED2 is toggled.