From e06eb556635c9a51b4af1973ad5f5f96dc6aac83 Mon Sep 17 00:00:00 2001
From: Eric Brombaugh <ebrombaugh1@cox.net>
Date: Sun, 26 Mar 2023 20:07:11 -0700
Subject: [PATCH] Working!
---
examples/systick_irq/systick.h | 13 +++++--------
examples/systick_irq/systick_irq.c | 22 ++++++++--------------
2 files changed, 13 insertions(+), 22 deletions(-)
diff --git a/examples/systick_irq/systick.h b/examples/systick_irq/systick.h
index e681d81..8aaa3ef 100644
--- a/examples/systick_irq/systick.h
+++ b/examples/systick_irq/systick.h
@@ -29,11 +29,11 @@ void systick_init(void)
/* Clear any existing IRQ */
SysTick->SR &= ~SYSTICK_SR_CNTIF;
-#if 0
+#if 1
/* Set the tick interval to 1ms for normal op */
SysTick->CMP = (SYSTEM_CORE_CLOCK/1000)-1;
#else
- /* Set the tick interval to 100ms for debug */
+ /* Set the tick interval to 1s for debug */
SysTick->CMP = (SYSTEM_CORE_CLOCK)-1;
#endif
@@ -49,19 +49,16 @@ void systick_init(void)
#if 1
/*
* SysTick ISR just counts ticks
+ * note - the __attribute__((interrupt)) syntax is crucial!
*/
-void SysTick_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
-//void SysTick_Handler(void) __attribute__((interrupt("interrupt")));
+void SysTick_Handler(void) __attribute__((interrupt));
void SysTick_Handler(void)
{
/* clear IRQ */
- SysTick->SR &= ~SYSTICK_SR_CNTIF;
+ SysTick->SR &= 0;
/* update counter */
systick_cnt++;
-
- printf("systick_cnt = 0x%08X\n\r", systick_cnt);
-
}
#endif
diff --git a/examples/systick_irq/systick_irq.c b/examples/systick_irq/systick_irq.c
index db9f4c4..589ed89 100644
--- a/examples/systick_irq/systick_irq.c
+++ b/examples/systick_irq/systick_irq.c
@@ -28,27 +28,21 @@ int main()
systick_init();
printf("done.\n\r");
-#if 1
+#if 0
// Debugging - does ISR run & inc counter?
// this section shows that IRQs during print will reset system, but during
// inf while() do not.
- //while(1)
- //for(int i=0;i<20;i++)
- //{
- //printf("i = %d ", i);
- printf("CNT = 0x%08X ", SysTick->CNT);
- printf("systick_cnt = 0x%08X\n\r", systick_cnt);
- //}
// does cnt inc?
- //uint32_t pcnt = systick_cnt;
+ uint32_t pcnt = systick_cnt;
while(1)
{
- //if(pcnt != systick_cnt)
- //{
- // printf("systick_cnt = %d\n\r", systick_cnt);
- // pcnt = systick_cnt;
- //}
+ if(pcnt != systick_cnt)
+ {
+ printf("CNT = 0x%08X ", SysTick->CNT);
+ printf("systick_cnt = %d\n\r", systick_cnt);
+ pcnt = systick_cnt;
+ }
}
#else
// Testing 1ms Systick
--
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