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e239955_stm1_stmicro_com
Visitor II
October 3, 2005
Question

EMI GPIO2

  • October 3, 2005
  • 2 replies
  • 625 views
Posted on October 03, 2005 at 09:01

EMI GPIO2

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    2 replies

    E
    e239955_stm1_stmicro_comAuthor
    Visitor II
    September 29, 2005
    Posted on September 29, 2005 at 15:46

    I was wondering :

    EMI use port P2.0 to P2.3 to generate CS0 to CS3 (corresponding to 4 banks EMI)

    So we configure GPIO as follows :

    GPIO_Config(GPIO2, 0x000F, GPIO_AF_PP);

    But port P2.4 to P2.7 are also used to for address bits A20 to A23.

    Do we have to configure these port pins to Alternate Function ?

    Why don't we configure GPIO2 like this :

    GPIO_Config(GPIO2, 0x00FF, GPIO_AF_PP);

    Unless that the P2.4 to P2.7 remains undefined ?

    What's wrong in my deduction ?

    Thx,

    Manu

    E
    e239955_stm1_stmicro_comAuthor
    Visitor II
    October 3, 2005
    Posted on October 03, 2005 at 09:01

    Great, I can configure EMI without the upper 4 address bits !

    That's nice

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