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ARM DUI 0224F Copyright © 2003-2007 ARM Limited. All rights reserved. 4-65
// ...
*SCI0_IMSC |= SCI0_CARDOUTIM; // Enable SCI0 card out interrupt
*PIC_IntEnable = PIC_SCI0; // Enable the PIC SCI0 interrupt
Example 4-2 shows how to detect the SCI1 card out interrupt signal from the secondary
interrupt controller.
Example 4-2 Pseudo code for SIC SCI1 card out interrupt
If PIC_IRQStatus flags set,
If PIC_SRC31 set,
...SIC interrupt handler
If SIC_SCI1 set,
...SCI1 interrupt handler
If SCI1_MIS,SCI1_CARDOUTIM flag set,
...act on interrupt then clear flag with SCI1_ICR
...Test other SCI1 flags
...Test other SIC flags
...Test other PIC flags
Example 4-3 shows clearing and re-enabling the SIC SCI1 card out interrupt by using
PIC_SCR31.
Example 4-3 Clearing and re-enabling SCI1 card out interrupt
#define PIC_BASE 0x10140000
#define PIC_IntEnable ((volatile unsigned int *)(PIC_BASE + 0x10))
#define PIC_SRC31 0x80000000 // SIC interrupt
#define SIC_BASE 0x10003000
#define SIC_ENSET ((volatile unsigned int *)(SIC_BASE + 0x08))
#define SIC_ENCLR ((volatile unsigned int *)(SIC_BASE + 0x0C))
#define SIC_SCI1 (1 << 5) // Smart Card interrupt
#define SCI1_CARDOUTIM 0x002 // Card removed
#define SCI1_IMSC ((volatile int *)(SCI1_BASE + 0x6C))
#define SCI1_ICR ((volatile int *)(SCI1_BASE + 0x78))
*PIC_IntEnable = PIC_SRC31; // Mask the PIC SIC (SRC 31) interrupt
*SIC_ENCLR = SIC_SCI1; // Mask the SIC SCI1 interrupt
*SCI1_ICR = SCI1_CARDOUTIM; // Clear SCI1 card out flag
// . . .
// code for managing SCI I/0