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手机阅读
下面是万利开发板 LCD DEMO 例子中的函数，改后初学者可以对照学习一下。
//=========================================================================
// 原函数名称： GPIO_Configuration(void)
//=========================================================================
void STM32_GPIO_Configuration(void)
{
/* Configure PC.04 -- PC.11 as Output push-pull */
STM32_Gpioc_Regs->crl.bit.CNF4=Output_push_pull; // PC.04 推挽输出
STM32_Gpioc_Regs->crl.bit.MODE4=Output_Mode_50mhz; // PC.04 输出模式，最大速度50MHz
STM32_Gpioc_Regs->crl.bit.CNF5=Output_push_pull; // PC.05 推挽输出
STM32_Gpioc_Regs->crl.bit.MODE5=Output_Mode_50mhz; // PC.05 输出模式，最大速度50MHz
STM32_Gpioc_Regs->crl.bit.CNF6=Output_push_pull;
STM32_Gpioc_Regs->crl.bit.MODE6=Output_Mode_50mhz;
STM32_Gpioc_Regs->crl.bit.CNF7=Output_push_pull;
STM32_Gpioc_Regs->crl.bit.MODE7=Output_Mode_50mhz;
STM32_Gpioc_Regs->crh.bit.CNF8=Output_push_pull;
STM32_Gpioc_Regs->crh.bit.MODE8=Output_Mode_50mhz;
STM32_Gpioc_Regs->crh.bit.CNF9=Output_push_pull;
STM32_Gpioc_Regs->crh.bit.MODE9=Output_Mode_50mhz;
STM32_Gpioc_Regs->crh.bit.CNF10=Output_push_pull;
STM32_Gpioc_Regs->crh.bit.MODE10=Output_Mode_50mhz;
STM32_Gpioc_Regs->crh.bit.CNF11=Output_push_pull;
STM32_Gpioc_Regs->crh.bit.MODE11=Output_Mode_50mhz;
/* Configure PD.03, PC.04, PC.11 -- PC.15 as input floating */
STM32_Gpiod_Regs->crl.bit.CNF3=Input_floating; // PD.03 浮空输入
STM32_Gpiod_Regs->crl.bit.MODE3=Input_Mode; // PD.03 输入模式
STM32_Gpioc_Regs->crl.bit.CNF4=Input_floating; // PC.04 浮空输入
STM32_Gpioc_Regs->crl.bit.MODE4=Input_Mode; // PC.04 输入模式
STM32_Gpioc_Regs->crh.bit.CNF11=Input_floating;
STM32_Gpioc_Regs->crh.bit.MODE11=Input_Mode;
STM32_Gpioc_Regs->crh.bit.CNF12=Input_floating;
STM32_Gpioc_Regs->crh.bit.MODE12=Input_Mode;
STM32_Gpioc_Regs->crh.bit.CNF13=Input_floating;
STM32_Gpioc_Regs->crh.bit.MODE13=Input_Mode;
STM32_Gpioc_Regs->crh.bit.CNF14=Input_floating;
STM32_Gpioc_Regs->crh.bit.MODE14=Input_Mode;
STM32_Gpioc_Regs->crh.bit.CNF15=Input_floating;
STM32_Gpioc_Regs->crh.bit.MODE15=Input_Mode;
/* Configure CAN pin: RX pd0 */
STM32_Gpiod_Regs->crl.bit.CNF0=Input_pull_up;
STM32_Gpiod_Regs->crl.bit.MODE0=Input_Mode;
/* Configure CAN pin: TX pd1 */
STM32_Gpiod_Regs->crl.bit.CNF1=Output_Af_push_pull;
STM32_Gpiod_Regs->crl.bit.MODE1=Output_Mode_2mhz;
/* CAN pin remap to PD0/PD1 */
// 11：CANRX映像到PD0，CANTX映像到PD1(只适用于100脚的封装)
STM32_Afio_Regs->mapr.bit.CAN_REMAP=3;
/* Configure PE.00 -- PE.15 as Output push-pull 50mhz */
STM32_Gpioe_Regs->crl.all=0x33333333;
STM32_Gpioe_Regs->crh.all=0x33333333;
}