diff options
| author | Christian Cunningham <cc@localhost> | 2021-12-03 10:46:47 -0700 |
|---|---|---|
| committer | Christian Cunningham <cc@localhost> | 2021-12-03 10:46:47 -0700 |
| commit | 0d37ddacb2f2e787ea1aa1878e0e5e39253f507b (patch) | |
| tree | d99421eb3f2ac09bacf9481a59036adffb14fe83 | |
| parent | 2700eb584bc889b9c1e87a78480b927579fe2cc1 (diff) | |
Added functionality to start and stop timer
| -rw-r--r-- | src/cpu/irq.S | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/src/cpu/irq.S b/src/cpu/irq.S index 53a749e..5b1ec43 100644 --- a/src/cpu/irq.S +++ b/src/cpu/irq.S @@ -24,13 +24,32 @@ a_irq_handler: movt r2, #0x3F20 ldrb r0, [r2] push {r0} - bl enable_irq + + // If 't' was pressed + // disable timer + cmp r0, #0x74 + bne a_irq_handler.ttimer + mrc p15, #0, r0, c14, c3, #1 + cmp r0, #0 + beq a_irq_handler.etimer + // Disable + bl disable_cntv + b a_irq_handler.ttimer +a_irq_handler.etimer: + // Enable + ldr r0, =cntfrq + bl write_cntv_tval + bl enable_cntv + // Otherwise continue +a_irq_handler.ttimer: pop {r0} bl uart_char ldr r0, =imsg bl uart_string + bl enable_irq pop {pc} a_irq_handler.timer: + // r2 = CORE0_INTERRUPT_SOURCE // if r2 & 0b1000 mov r2, #0x40000000 |