IIC.zip_4412iic_exynos4412_iic linux_什么是iic测试

int (*printf)(char * ,...)= 0x43e11434; #define GPD1CON *(volatile unsigned long *)(0x114000c0) #define I2CCON *(volatile unsigned long *)(0x13870000 + 0x0000) #define I2CSTAT *(volatile unsigned long *)(0x13870000 + 0x0004) #define I2CDS *(volatile unsigned long *)(0x13870000 + 0x000C) #define I2CLC *(volatile unsigned long *)(0x13870000 + 0x0010) void pin_set(void); void iic_init(void); void iic_term(void); void my_read(char slave_addr,char slave_reg,char * data); int main(void) { pin_set(); char data ; char slave_addr = 0x70; char slave_reg = 0x0; my_read(slave_addr,slave_reg,&data); // printf("data is 0x%x \n",data); // slave_reg = 0x82; // my_read(slave_addr,slave_reg,&data); // printf("data is 0x%x \n",data); } void pin_set(void) { GPD1CON &= 0xffff00ff; GPD1CON |= 0x2200; } void iic_init(void) { I2CCON = 0x75; I2CLC = 7; } void iic_term(void) { I2CCON = 0; I2CSTAT = 0; I2CLC = 0; } void my_read(char slave_addr,char slave_reg,char * data) { iic_init(); printf("begin \n"); //step 1 while(1) { if(!(I2CSTAT & ( 1 << 5))) break; } I2CDS = slave_addr; I2CSTAT = 0xf0; while(1) { if(0 == (I2CCON & ( 1 << 4))) ; else break; } I2CDS = slave_reg; I2CCON &= ~(1 << 4); while(1) { if(0 == (I2CCON & ( 1 << 4))) ; else break; } I2CSTAT = 0xD0; I2CCON &= ~(1 << 4); while(1) { if(!(I2CSTAT & ( 1 << 5))) break; } printf(" end \n"); //step 1 I2CCON |= (1 << 7); I2CDS = slave_addr; I2CSTAT = 0xb0; int i = 0; flag1: while(1) { if(I2CCON & ( 1 << 4)) break; } printf("new start \n"); *data = I2CDS; printf(" %d 0x%x \n",i,*data); i++; I2CCON &= ~(1 << 4); while(1) { if(I2CCON & ( 1 << 4)) break; } if(i > 10) goto flag2; else goto flag1; flag2: printf("new start .....\n"); I2CSTAT = 0x90; I2CCON &= ~(1 << 4); I2CCON &= ~(1 << 7); // while(1) // { // if( 0 == (I2CSTAT & ( 1 << 5))) // break; // } printf("new end \n"); iic_term(); }