[Bit band operation to register assignment] GPIO multiplexing mode initialization based on ADuCM4050

【A ribbon gymnastics against the register assignment】基于ADuCM4050的GPIOMultiplexing mode initialization

#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
#define MEM_ADDR(addr) *((volatile unsigned long *)(addr)) 
#define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))

#define GPIO0_MUL_Addr (ADI_GPIO0_BASE+0) //0x40020000
#define P0_M(n) BIT_ADDR(GPIO0_MUL_Addr,n) 

#define GPIO1_MUL_Addr (ADI_GPIO1_BASE+0) //0x40020000
#define P1_M(n) BIT_ADDR(GPIO1_MUL_Addr,n) 

#define GPIO2_MUL_Addr (ADI_GPIO2_BASE+0) //0x40020000
#define P2_M(n) BIT_ADDR(GPIO2_MUL_Addr,n) 

#define GPIO3_MUL_Addr (ADI_GPIO3_BASE+0) //0x40020000
#define P3_M(n) BIT_ADDR(GPIO3_MUL_Addr,n) 
void mux_GPIO(uint8_t ports,uint8_t pins,uint8_t mux)
{
    
	uint8_t a,b;
	a = pins*2-1;
	b = pins*2;
	uint8_t c,d;
	c=mux>>1;
	c=0x01 & c;
	d=0x01 & mux;
	if(ports == 0)
	{
    
		P0_M(a) = c;
		P0_M(b) = d;
	}
	else if(ports == 1)
	{
    
		P1_M(a) = c;
		P1_M(b) = d;
	}
	else if(ports == 2)
	{
    
		P2_M(a) = c;
		P2_M(b) = d;
	}
	else if(ports == 3)
	{
    
		P3_M(a) = c;
		P3_M(b) = d;
	}
	else{
    }
}