Xg1@LED_̃XPb`

#include "ch32v00x.h"

void setFHCLKto62kHz() {
    RCC->CFGR0 &= ~(0xF << 4); 
    RCC->CFGR0 |=  (128 >> 1 << 4); 
}

void setup() {
    setFHCLKto62kHz();
    pinMode(PD6, OUTPUT);
}

void loop() {
    digitalWrite(PD6, HIGH);  // LED ON
    delay(20);                 // 20ms

    digitalWrite(PD6, LOW);   // LED OFF
    delay(80);                 // 80ms
}

