diff options
Diffstat (limited to 'nuttx/arch/pjrc-8051/src/up_head.S')
| -rw-r--r-- | nuttx/arch/pjrc-8051/src/up_head.S | 89 |
1 files changed, 82 insertions, 7 deletions
diff --git a/nuttx/arch/pjrc-8051/src/up_head.S b/nuttx/arch/pjrc-8051/src/up_head.S index 1981e5dd8..44f8038c9 100644 --- a/nuttx/arch/pjrc-8051/src/up_head.S +++ b/nuttx/arch/pjrc-8051/src/up_head.S @@ -51,6 +51,12 @@ .area REG_BANK_0 (REL,OVR,DATA) .ds 8 +#ifndef CONFIG_8052_TIMER2 + .area XSEG +_g_timer0tick: + .ds 1 +#endif + /************************************************************ * Public Data ************************************************************/ @@ -93,9 +99,12 @@ .org PM2_VECTOR_TIMER0 push acc +#ifdef CONFIG_8052_TIMER2 mov a, #TIMER0_IRQ ljmp _up_interrupt - +#else + ljmp _up_timer0 +#endif .org PM2_VECTOR_EXTINT1 push acc mov a, #EXT_INT1_IRQ @@ -127,13 +136,77 @@ start: mov sp, #(STACK_BASE-1) -#ifdef CONFIG_8051_LEDS +#ifdef CONFIG_ARCH_LEDS lcall _up_ledinit #endif ljmp _os_start /************************************************************ + * Name: up_timer0 + * + * Description: + * Timer 0, mode 0 can be used as a system timer. In that + * mode, the 1.8432 MHz clock is divided by 32. A single + * 8-bit value is incremented at 57600 Hz, which results + * in 225 Timer 0 overflow interrupts per second. + * + * The Timer0 interrupt vectors to this point which then + * does a software divide by 2 to get a system timer of + * 112.5Hz. + * + * On Entry: + * + * (1) acc on the stack and + * (2) the IRQ number(TIMER0_IRQ) in the accumulator + * + ************************************************************/ + +#ifndef CONFIG_8052_TIMER2 +_up_timer0: + ar2 = 0x02 + ar3 = 0x03 + ar4 = 0x04 + ar5 = 0x05 + ar6 = 0x06 + ar7 = 0x07 + ar0 = 0x00 + ar1 = 0x01 + + /* ACC already on the stack; push IE. Then disable interrupts */ + + push ie + clr ea + + /* Save the remaining registers with interrupts disabled + * + * a, ie, and dptr go on the stack. + */ + + push dpl + push dph + + /* Increment the tick counter */ + + mov dptr, #_g_timer0tick + movx a, @dptr + inc a + movx @dptr, a + + /* If bit 0 is '0', then just return from the interrupt */ + + anl a, #0x01 + jnz 00101$ + ljmp _up_timer0exit + + /* If bit 0 is '1', then process the interrupt */ + +00101$: + mov a, #TIMER0_IRQ + sjmp _up_timer0join +#endif + +/************************************************************ * Name: up_interrupt * * Description: @@ -167,6 +240,7 @@ _up_interrupt: push dpl push dph +_up_timer0join: /* Other registers go into the IRQ register save area */ push acc @@ -175,7 +249,7 @@ _up_interrupt: /* Show interrupt status on the LEDs */ -#ifdef CONFIG_8051_LEDS +#ifdef CONFIG_ARCH_LEDS mov dpl, #LED_INIRQ lcall _up_ledon #endif @@ -343,12 +417,12 @@ _up_interrupt: push dpl push dph lcall _up_dumpstack - pop dpl pop dph + pop dpl #endif /* Get the pointer to the register save area */ - mov a, #FRAME_SIZE + mov a, #STACK_SIZE add a, dpl mov dpl, a clr a @@ -365,18 +439,19 @@ _up_interrupt: * (context switch). */ -#ifdef CONFIG_8051_LEDS +#ifdef CONFIG_ARCH_LEDS push dpl push dph mov dpl, #LED_INIRQ lcall _up_ledoff - pop dpl pop dph + pop dpl #endif /* Restore registers from the register save area */ lcall _up_restoreregisters +_up_timer0exit: /* Restore registers from the stack and return */ pop dph |