Write a square wave with output frequency of 2KHz with STM8S 105 single chip microcomputer, C language? Never used stm8 single-chip microcomputer, seeking introductory information. thank you

//This routine outputs a square wave with a frequency of 2K and an adjustable duty cycle through the TIM2 CH 1(PD4 pin) channel, and the duty cycle can be adjusted by pressing the key on the PD7 pin.

# including "STM8S 105K.h"

Typedef unsigned character u8;

Typedef unsigned int u16;

U 16 value;

void SystemInit(void)

{

CLK _ CKDIVR = 0x 08； // 16M internal RC divided by 2, and the system clock is 8M.

CLK _ PCK ENR 1 | = 0x 60； //Enable TIM2 and TIM3 to connect with the main frequency.

PD _ CR2 | = 0x80// Enables external interrupt of PD7 port.

}

void GPIO_init(void)

{

PD _ DDR = 0x 1F； //Configure the full output of the PD port direction register.

PD _ Cr 1 = 0x 1F； //Set PD as push-pull output.

}

Voidtim2 _ init (void)//tim2ch 1 working in mode1.

{

Tim 2 _ ccmr 1 = 0x 60； // PWM mode 1, TIM2 CH 1.

Tim 2 _ ccer 1 = 0x 03； // CC 1 is configured as an output.

TIM2 _ ARRH = 0x07// Configure the PWM resolution to 10 bit, and ARR=0x07D0.

Tim 2 _ ARRL = 0xd 0； // PWM frequency =8M/0x07D0=2000Hz.

Tim 2 _ Cr 1 | = 0x 0 1； //The counter is enabled to start counting.

}

Void initialization device (void)

{

ASM(“sim”)；

system init()；

GPIO _ init()；

Tim 2 _ init()；

_ ASM(“rim”)； //Open host interrupt

}

Invalid master (invalid)

{

init _ devices()；

while( 1)

Tim 2 _ CCR 1 = value； //Changing the value can change the frequency.

}

/****************************************************************************

* * * function name: @ near @ interruptvoid tli _ irqhandler (void)

* * * Function Description: Interrupt service program

Press the PD7 button to change the duty cycle.

*****************************************************************************/

@ near @ interrupt void TLI _ IRQ handler(void)

{

PD _ CR2 & amp= 0x7F///Turn off the external interrupt of PD7.

Value+= 50;

while(value & gt； 1000)

Value = 0;

PD _ CR2 | = 0x80// Enables external interrupt of PD7 port.

Return;

}