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What does "CMSDK_GPIO1->ALTFUNCSET = (1<<5);" do?

ele

Dear All,

I came across initial function as the below,

void UartStdOutInit(void)
{
CMSDK_UART2->BAUDDIV = 16;
CMSDK_UART2->CTRL = 0x41; // High speed test mode, TX only
CMSDK_GPIO1->ALTFUNCSET = (1<<5);
return;

}

At the first time this function is called for initializing uart port.

But I can't understand what CMSDK_GPIO1->ALTFUNCSET = (1<<5); instruction do ?

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