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Provide a function to change timer interrrupt handlers

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Function irq_register_timer_handler(int timer, void (*isr)(void))
lets you change the handler at runtime.  This lets us set handlers
without necessarily knowing the name at link-time.  The old way of
having weakly-linked tmr0_isr functions should still work.
This commit is contained in:
Jim Paris 2010-09-28 18:10:22 -04:00 committed by Mariano Alvira
parent 76563958fe
commit b2c64dc233
2 changed files with 22 additions and 6 deletions
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2
src/default_lowlevel.h
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@ -40,4 +40,6 @@
void default_vreg_init(void);
void uart1_init(uint16_t inc, uint16_t mod, uint8_t samp);
void irq_register_timer_handler(int timer, void (*isr)(void));
#endif

26
src/isr.c
View File

@ -35,6 +35,19 @@
#include <mc1322x.h>
static void (*tmr_isr_funcs[4])(void) = {
tmr0_isr,
tmr1_isr,
tmr2_isr,
tmr3_isr
};
void irq_register_timer_handler(int timer, void (*isr)(void))
{
tmr_isr_funcs[timer] = isr;
}
__attribute__ ((section (".irq")))
__attribute__ ((interrupt("IRQ")))
void irq(void)
@ -43,16 +56,17 @@ void irq(void)
while ((pending = *NIPEND)) {
if(bit_is_set(pending, INT_NUM_TMR)) {
if(bit_is_set(pending, INT_NUM_TMR)) {
/* dispatch to individual timer isrs if they exist */
/* timer isrs are responsible for determining if they
* caused an interrupt */
/* and clearing their own interrupt flags */
if(tmr0_isr != 0) { tmr0_isr(); }
if(tmr1_isr != 0) { tmr1_isr(); }
if(tmr2_isr != 0) { tmr2_isr(); }
if(tmr3_isr != 0) { tmr3_isr(); }
}
if (tmr_isr_funcs[0] != 0) { (tmr_isr_funcs[0])(); }
if (tmr_isr_funcs[1] != 0) { (tmr_isr_funcs[1])(); }
if (tmr_isr_funcs[2] != 0) { (tmr_isr_funcs[2])(); }
if (tmr_isr_funcs[3] != 0) { (tmr_isr_funcs[3])(); }
}
if(bit_is_set(pending, INT_NUM_MACA)) {
if(maca_isr != 0) { maca_isr(); }
}