MRT.cpp

00001 #include "MRT.h"
00002 
00003 MRT::MRT(int channel)
00004 {
00005     static bool insted = false;
00006 
00007     if (!insted) {
00008         inst();
00009         insted = true;
00010     }
00011 
00012     _ch = &LPC_MRT->Channel[channel];
00013     _ch->CTRL |= (1<<1); // one-shot
00014 }
00015 
00016 void MRT::inst()
00017 {
00018     LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // enable MRT
00019     LPC_SYSCON->PRESETCTRL |= (1<<7); // reset MRT
00020     us_clk = SystemCoreClock / 1000000;
00021 }
00022 
00023 void MRT::write(uint32_t interval)
00024 {
00025     _ch->INTVAL = interval | (1<<31); // and LOAD
00026     _ch->STAT |= 0x01;
00027 }
00028 
00029 int MRT::status()
00030 {
00031     return (_ch->STAT & 1) ? IDLE : RUNNING;
00032 }
00033 
00034 void MRT::wait_ms(uint32_t timeout_ms)
00035 {
00036     wait_raw(us_clk * 1000 * timeout_ms);
00037 }
00038 
00039 void MRT::wait_us(uint32_t timeout_us)
00040 {
00041     wait_raw(us_clk * timeout_us);
00042 }
00043 
00044 void MRT::wait_raw(uint32_t timeout)
00045 {
00046     write(timeout);
00047     while(status() == RUNNING);
00048 }
00049 
00050 uint32_t MRT::read()
00051 {
00052      return _ch->TIMER;
00053 }