From: richardbarry <richardbarry@1d2547de-c912-0410-9cb9-b8ca96c0e9e2>
Date: Sun, 6 Apr 2008 09:25:59 +0000 (+0000)
Subject: Corrected SysTick interval calculation.
X-Git-Tag: V5.0.0~31
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=0a5a997d611142bbfe79c40be0ec4768937b0007;p=freertos

Corrected SysTick interval calculation.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@293 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
---

diff --git a/Source/portable/IAR/ARM_CM3/port.c b/Source/portable/IAR/ARM_CM3/port.c
index 5059de372..be91fdfb3 100644
--- a/Source/portable/IAR/ARM_CM3/port.c
+++ b/Source/portable/IAR/ARM_CM3/port.c
@@ -200,7 +200,7 @@ void xPortSysTickHandler( void )
 void prvSetupTimerInterrupt( void )
 {
 	/* Configure SysTick to interrupt at the requested rate. */
-	*(portNVIC_SYSTICK_LOAD) = configCPU_CLOCK_HZ / configTICK_RATE_HZ;
+	*(portNVIC_SYSTICK_LOAD) = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
 	*(portNVIC_SYSTICK_CTRL) = portNVIC_SYSTICK_CLK | portNVIC_SYSTICK_INT | portNVIC_SYSTICK_ENABLE;
 }
 /*-----------------------------------------------------------*/