direct pin access

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ossi

Well-known member
I want to toggle directly the LED pin (pin 13) without using any library routines or any predifined constants. Has someone an example? Is it right that the pin13-toggle is on port 401B8000+4000+8C on the Teensy 40 and is bit 3 ? But the following code does not work

Code:
void loop() {
  gpio_adr1=0x401b8000+0x4000+0x8c ;
  *gpio_adr1=0x8 ;
  delay(250) ; 
   gpio_adr1=0x401b8000+0x4000+0x8c ;
  *gpio_adr1=0x0 ;
  delay(250) ; 
  }
 
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