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@1:57aba608a20d, 2014-12-10 (annotated)

Committer:
Ellor1
Date:
Wed Dec 10 11:00:33 2014 +0000
Revision:
1:57aba608a20d
Parent:
0:538efd9574f7
Child:
2:46e8391685c4
working wait function;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ellor1 0:538efd9574f7 1 #include "mbed.h"
Ellor1 1:57aba608a20d 2 //#include "TextLCD_16x4.h"
Ellor1 0:538efd9574f7 3 #include "LCD_Wait.h"
Ellor1 0:538efd9574f7 4
Ellor1 1:57aba608a20d 5 //LCD_Wait *LCD_Wait::instance;
Ellor1 0:538efd9574f7 6
Ellor1 1:57aba608a20d 7 LCD_Wait::LCD_Wait(void) //LCD_Wait constructor
Ellor1 0:538efd9574f7 8 {
Ellor1 0:538efd9574f7 9
Ellor1 1:57aba608a20d 10 LPC_SYSCON->SYSAHBCLKCTRL |= CT16B1_CLK_ENABLE; // setup system clock to enable 16 bit Timer 1 Page 30 of user manual
Ellor1 0:538efd9574f7 11
Ellor1 1:57aba608a20d 12 LPC_CT16B1->PR = 48000; // Set prescale value to give 1ms clock.
Ellor1 1:57aba608a20d 13
Ellor1 0:538efd9574f7 14 }
Ellor1 0:538efd9574f7 15
Ellor1 0:538efd9574f7 16
Ellor1 1:57aba608a20d 17 void LCD_Wait::Wait(float num_wait) { // wait function
Ellor1 0:538efd9574f7 18
Ellor1 1:57aba608a20d 19 LPC_CT16B1->TC = 0; //set Timer Counter register to 0
Ellor1 0:538efd9574f7 20
Ellor1 0:538efd9574f7 21 // Start the timer
Ellor1 0:538efd9574f7 22 LPC_CT16B1->TCR = CT16B1_TCR_CEN; // enable
Ellor1 0:538efd9574f7 23
Ellor1 0:538efd9574f7 24 // blocking while loop that waits for the timer counter to exceed the set value
Ellor1 0:538efd9574f7 25 // If another interrupt fires during this while loop, this Wait function might take a little longer than expected
Ellor1 1:57aba608a20d 26
Ellor1 0:538efd9574f7 27 while(LPC_CT16B1->TC < num_wait);
Ellor1 0:538efd9574f7 28
Ellor1 0:538efd9574f7 29 }
Ellor1 0:538efd9574f7 30