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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
Last commit 20 Feb 2019 by 
mbed official
Diff: targets/hal/TARGET_NXP/TARGET_LPC81X/us_ticker.c
- Revision:
- 614:9d86c2ae5de0
- Parent:
- 480:69aad4cbc07a
--- a/targets/hal/TARGET_NXP/TARGET_LPC81X/us_ticker.c Thu Aug 20 10:45:13 2015 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC81X/us_ticker.c Tue Sep 01 16:00:09 2015 +0100
@@ -20,6 +20,7 @@
//New, using MRT instead of SCT, needed to free up SCT for PWM
//Ported from LPC824 libs
static int us_ticker_inited = 0;
+static int us_ticker_interrupt_inited = 0;
unsigned int ticker_fullcount_us;
unsigned long int ticker_expired_count_us = 0;
int MRT_Clock_MHz;
@@ -53,7 +54,15 @@
LPC_MRT->INTVAL1 = 0x80000000UL;
// Disable ch1 interrupt, Mode 0 is Repeat Interrupt
LPC_MRT->CTRL1 = (0x0 << 1) | (0x0 << 0);
-
+}
+
+void us_ticker_interrupt_init(void) {
+
+ if (us_ticker_interrupt_inited)
+ return;
+
+ us_ticker_interrupt_inited = 1;
+
// Set MRT interrupt vector
NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler);
NVIC_EnableIRQ(US_TICKER_TIMER_IRQn);
@@ -84,6 +93,9 @@
//TIMER1 is used for Timestamped interrupts (Ticker(), Timeout())
void us_ticker_set_interrupt(timestamp_t timestamp) {
+ if (!us_ticker_interrupt_inited)
+ us_ticker_interrupt_init();
+
// MRT source clock is SystemCoreClock (30MHz) and MRT is a 31-bit countdown timer
// Force load interval value (Bit 0-30 is interval value, Bit 31 is Force Load bit)
// Note: The MRT has less counter headroom available than the typical mbed 32bit timer @ 1 MHz.
