Generator problem

[ted456]

Hi
This generator is working ok when I am using ST Link as upload method , when using a serial method buttons are not working and on display is a number 741 = 741 Hz.
Any idea how to fix it ?

Code: Select all

#include <EEPROM.h> 

unsigned long amp = 0;

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306_STM32.h>

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

void setup() {

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  
  display.display();
  display.clearDisplay(); 
  display.drawPixel(100, 15, WHITE);

  pinMode(PA8, PWM);
  pinMode(PA9, PWM);
  pinMode(PB8, INPUT_PULLUP);
  pinMode(PB9, INPUT_PULLUP);
  TIMER1_BASE->CCER = (1 << 4) | (1 << 0);
  TIMER1_BASE->CCMR1 = (1 << 13) | (1 << 12) | (1 << 5) | (1 << 4);
  TIMER1_BASE->PSC = 0;
  TIMER1_BASE->CCR1 = 0 ;
  TIMER1_BASE->CR1 = 1;
  EEPROM.read(500, (uint16*)&amp);

}

void loop() {
  if (digitalRead(PB8) == 0) {
    amp++;

    EEPROM.write(500, amp);
  }
  if (digitalRead(PB9) == 0) {
    amp--;

    EEPROM.write(500, amp);
  }

  TIMER1_BASE->ARR = amp * 2;
  TIMER1_BASE->CCR2 = amp ;

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);

  display.setCursor(64, 28);
  display.print(36000000 / amp / 2);
  display.display();

  delay(20);
}

[sj_remington]

What might the "generator" be?