Posted on May 17, 2011 at 09:36When use P9 as output port, should init the GPIO9 as follows
GPIO_DeInit(GPIO9);
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
GPIO_InitStructure.GPIO_Alternate=GPIO_OutputAlt1;
GPIO_Init (GPIO9, &GPIO_InitStructure);
if run this program step by step, we will find that:
SCU->GPIOOUT[GPIO_Number]=?? // GPIO_Number is 9 !!
But the range of SCU->GPIOOUT[] is 0..7,
SCU->GPIOOUT[8] and SCU->GPIOOUT[9] are not exist!!
I think should add the (1) statment in GPIO_Init function.
/**********************************************/
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
{
/* Select pin direction */
u8 PinNumber = 0;
u8 Counter = 0;
u8 GPIO_Number = 0;
GPIO_Number = GPIO_GetGPIONumber(GPIOx);
if(GPIO_InitStruct->GPIO_Direction == GPIO_PinOutput)
{
GPIOx->DDR |= GPIO_InitStruct->GPIO_Pin;
}
else
{
GPIOx->DDR &= ~GPIO_InitStruct->GPIO_Pin;
}
for (Counter = 0; Counter < 8;Counter++)
{
/*Search pin number*/
PinNumber = (GPIO_InitStruct->GPIO_Pin & (1 <
if((PinNumber >> Counter) == 1)
{
if (GPIO_Number
{
/*Output ALternate 0*/
SCU->GPIOOUT[GPIO_Number] &= ~(0x3 <
if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt1)
{
/*Output ALternate 1*/
SCU->GPIOOUT[GPIO_Number] |= 1 << (Counter *2); // (2)
}
if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt2)
{
/*Output ALternate 2*/
SCU->GPIOOUT[GPIO_Number] |= 0x2 << (Counter *2);
}
if(GPIO_InitStruct->GPIO_Alternate == GPIO_OutputAlt3)
{
/*Output ALternate 3*/
SCU->GPIOOUT[GPIO_Number] |= 0x3 << (Counter *2);
}
}
/*Type configuration: PushPull or Open Collector*/
SCU->GPIOTYPE[GPIO_Number] &= ~(0x1 << Counter) ;
if(GPIO_InitStruct->GPIO_Type == GPIO_Type_OpenCollector)
{
/*Open Drain configuration*/
SCU->GPIOTYPE[GPIO_Number] |= 0x1 << Counter;
}
/*IP Connected disable*/
SCU->GPIOIN[GPIO_Number] &= ~(0x1 << Counter) ;
if(GPIO_InitStruct->GPIO_IPConnected == GPIO_IPConnected_Enable)
{
/*IP Connected enable*/
SCU->GPIOIN[GPIO_Number] |= 0x1 << Counter;
}
}
}
}
[ This message was edited by: seawwh on 07-02-2007 16:06 ]
[ This message was edited by: seawwh on 11-02-2007 09:33 ]
