AnsweredAssumed Answered

High Speed IO?? Is it really true?

Question asked by yuce.ali.002 on Oct 22, 2012
Latest reply on Oct 22, 2012 by Clive One
Hi all,

I bougth a STM32F2 evulation board and iam trying to use high speed IO's but i didnt succes. here is the code;


  /* Configure PG6 and PG8 in output pushpull mode */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOF, &GPIO_InitStructure);

          /* Set PG6 and PG8 */
              GPIOF->BSRRL = GPIO_Pin_6 | GPIO_Pin_8;
              /* Reset PG6 and PG8 */
              GPIOF->BSRRH = GPIO_Pin_6 | GPIO_Pin_8;

And i set the PCLK1 to 30, PCLK2 to 60MHz. My HSE is 25MHz and i see it on the MCO1 pin.

Anyway when i measure the PG6 and PG8 its frequency is just 10MHz. But i expect little higher value? Is this frequency normal? Because in the datasheet it wrotes like this;

Up to 140 I/O ports with interrupt capability:
  • Up to 136 fast I/Os up to 60 MHz

How can i get the 60MHz signal on the any GPIO pins?