Callum Ellor / LCD_Wait

Wait function that uses 16 Bit Timer 1 instead of using 32 bit Timer 0 to be used in conjunction with 'TextLCD16x4_Wait' and 'PulseWidthCapture' to measure the +ve and -ve Pulsewdth of a signal

Dependents:   PulseWidthCapture_Program

LCD_Wait.cpp@2:46e8391685c4, 2014-12-11 (annotated)

Committer:
Ellor1
Date:
Thu Dec 11 08:59:33 2014 +0000
Revision:
2:46e8391685c4
Parent:
1:57aba608a20d 
Wait Library for TextLCD16x4;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ellor1 2:46e8391685c4 1 /***********************************************************************************************************************
Ellor1 2:46e8391685c4 2 This library has been created to create a new wait function that uses the 16 bit Timer 1 rather that the traditional 32 Bit Timer 0.
Ellor1 2:46e8391685c4 3 This library is intended for use with the 'TextLCD_16x4' Library to get the lcd to work alongside the 'PulseWidthCapture' Program.
Ellor1 2:46e8391685c4 4
Ellor1 2:46e8391685c4 5 Created by
Ellor1 2:46e8391685c4 6 Callum Ellor
Ellor1 2:46e8391685c4 7 **************************************************************************************************************************/
Ellor1 2:46e8391685c4 8
Ellor1 0:538efd9574f7 9 #include "mbed.h"
Ellor1 0:538efd9574f7 10 #include "LCD_Wait.h"
Ellor1 0:538efd9574f7 11
Ellor1 1:57aba608a20d 12 LCD_Wait::LCD_Wait(void) //LCD_Wait constructor
Ellor1 0:538efd9574f7 13 {
Ellor1 0:538efd9574f7 14
Ellor1 1:57aba608a20d 15 LPC_SYSCON->SYSAHBCLKCTRL |= CT16B1_CLK_ENABLE; // setup system clock to enable 16 bit Timer 1 Page 30 of user manual
Ellor1 0:538efd9574f7 16
Ellor1 1:57aba608a20d 17 LPC_CT16B1->PR = 48000; // Set prescale value to give 1ms clock.
Ellor1 1:57aba608a20d 18
Ellor1 0:538efd9574f7 19 }
Ellor1 2:46e8391685c4 20
Ellor1 1:57aba608a20d 21 void LCD_Wait::Wait(float num_wait) { // wait function
Ellor1 0:538efd9574f7 22
Ellor1 1:57aba608a20d 23 LPC_CT16B1->TC = 0; //set Timer Counter register to 0
Ellor1 0:538efd9574f7 24
Ellor1 0:538efd9574f7 25 // Start the timer
Ellor1 0:538efd9574f7 26 LPC_CT16B1->TCR = CT16B1_TCR_CEN; // enable
Ellor1 0:538efd9574f7 27
Ellor1 0:538efd9574f7 28 // blocking while loop that waits for the timer counter to exceed the set value
Ellor1 0:538efd9574f7 29 // If another interrupt fires during this while loop, this Wait function might take a little longer than expected
Ellor1 1:57aba608a20d 30
Ellor1 0:538efd9574f7 31 while(LPC_CT16B1->TC < num_wait);
Ellor1 0:538efd9574f7 32
Ellor1 0:538efd9574f7 33 }
Ellor1 0:538efd9574f7 34