Accessing Interrupts / Status Register - Texas Instruments C28 Series Student Manual

Accessing Interrupts / Status Register

Accessing Interrupts / Status Register
Accessing Interrupts / Status Register
Accessing Interrupts / Status Register
Initialize via C :
Initialize via C :
extern extern
extern extern
Interrupt Enable & Interrupt Flag Registers (IER, IFR) are not
Interrupt Enable & Interrupt Flag Registers (IER, IFR) are not
memory mapped memory mapped
Only limited instructions can access IER & IFR (more in interrup Only limited instructions can access IER & IFR (more in interrup
chapter) chapter)
The compiler provides extern variables for accessing the IER & I The compiler provides extern variables for accessing the IER & I
D- 6
cregister cregister volatile unsigned volatile unsigned
cregister cregister volatile unsigned volatile unsigned
. . .
. . .
IER &= ~Mask;
IER &= ~Mask;
IER |= Mask;
IER |= Mask;
IFR IFR = 0x0000; = 0x0000;
int int IFR; IFR;
int int IER; IER;
//clear desired bits
//clear desired bits
//set desired bits
//set desired bits
//clear prior interrupts //clear prior interrupts
t t
FR FR
C28x – C Programming