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@0:538efd9574f7, 2014-12-10 (annotated)

Committer:
Ellor1
Date:
Wed Dec 10 10:33:53 2014 +0000
Revision:
0:538efd9574f7
Child:
1:57aba608a20d
working Wait Function added;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ellor1 0:538efd9574f7 1 #include "mbed.h"
Ellor1 0:538efd9574f7 2 #include "TextLCD_16x4.h"
Ellor1 0:538efd9574f7 3 #include "LCD_Wait.h"
Ellor1 0:538efd9574f7 4
Ellor1 0:538efd9574f7 5 //DigitalOut led(P0_9);
Ellor1 0:538efd9574f7 6 //DigitalOut led2(P0_8);
Ellor1 0:538efd9574f7 7 //DigitalOut led3(P0_7);
Ellor1 0:538efd9574f7 8 //DigitalOut led4(P0_17);
Ellor1 0:538efd9574f7 9 //DigitalOut led5(P0_1);
Ellor1 0:538efd9574f7 10
Ellor1 0:538efd9574f7 11 LCD_Wait *LCD_Wait::instance;
Ellor1 0:538efd9574f7 12
Ellor1 0:538efd9574f7 13 LCD_Wait::LCD_Wait(void)
Ellor1 0:538efd9574f7 14 {
Ellor1 0:538efd9574f7 15
Ellor1 0:538efd9574f7 16 LPC_SYSCON->SYSAHBCLKCTRL |= CT16B1_CLK_ENABLE;
Ellor1 0:538efd9574f7 17
Ellor1 0:538efd9574f7 18 LPC_CT16B1->PR = 48000;
Ellor1 0:538efd9574f7 19
Ellor1 0:538efd9574f7 20 //LPC_CT16B1->MCR = CT16B1_MR0I | CT16B1_MR0R;
Ellor1 0:538efd9574f7 21
Ellor1 0:538efd9574f7 22 // LPC_CT16B1->IR = CT16B1_IR_MR0INT;
Ellor1 0:538efd9574f7 23
Ellor1 0:538efd9574f7 24
Ellor1 0:538efd9574f7 25
Ellor1 0:538efd9574f7 26 //instance = this;
Ellor1 0:538efd9574f7 27 //NVIC_SetVector(TIMER_16_1_IRQn, (uint32_t)&_Wait_ISR);
Ellor1 0:538efd9574f7 28
Ellor1 0:538efd9574f7 29 }
Ellor1 0:538efd9574f7 30
Ellor1 0:538efd9574f7 31
Ellor1 0:538efd9574f7 32 void LCD_Wait::Wait(float num_wait) {
Ellor1 0:538efd9574f7 33
Ellor1 0:538efd9574f7 34 // wait_n = num_wait;
Ellor1 0:538efd9574f7 35 //led = !led;
Ellor1 0:538efd9574f7 36
Ellor1 0:538efd9574f7 37 LPC_CT16B1->TC = 0;
Ellor1 0:538efd9574f7 38
Ellor1 0:538efd9574f7 39 // Start the timer
Ellor1 0:538efd9574f7 40 LPC_CT16B1->TCR = CT16B1_TCR_CEN; // enable
Ellor1 0:538efd9574f7 41
Ellor1 0:538efd9574f7 42 // blocking while loop that waits for the timer counter to exceed the set value
Ellor1 0:538efd9574f7 43 // If another interrupt fires during this while loop, this Wait function might take a little longer than expected
Ellor1 0:538efd9574f7 44 // while(LPC_CT16B1->TC < my_max_count_value);
Ellor1 0:538efd9574f7 45 while(LPC_CT16B1->TC < num_wait);
Ellor1 0:538efd9574f7 46
Ellor1 0:538efd9574f7 47 }
Ellor1 0:538efd9574f7 48
Ellor1 0:538efd9574f7 49 //Enable interrupt
Ellor1 0:538efd9574f7 50 // NVIC_EnableIRQ(TIMER_16_1_IRQn);
Ellor1 0:538efd9574f7 51
Ellor1 0:538efd9574f7 52 // Start the timer
Ellor1 0:538efd9574f7 53 // LPC_CT16B1->TCR = CT16B1_TCR_CEN; // enable
Ellor1 0:538efd9574f7 54
Ellor1 0:538efd9574f7 55 // LPC_CT16B1->MR0 = wait_n;
Ellor1 0:538efd9574f7 56
Ellor1 0:538efd9574f7 57 // }
Ellor1 0:538efd9574f7 58
Ellor1 0:538efd9574f7 59
Ellor1 0:538efd9574f7 60
Ellor1 0:538efd9574f7 61 /*
Ellor1 0:538efd9574f7 62 void LCD_Wait::Wait(int num_wait) {
Ellor1 0:538efd9574f7 63
Ellor1 0:538efd9574f7 64 wait_n = num_wait;
Ellor1 0:538efd9574f7 65 led = !led;
Ellor1 0:538efd9574f7 66
Ellor1 0:538efd9574f7 67 //Enable interrupt
Ellor1 0:538efd9574f7 68 NVIC_EnableIRQ(TIMER_16_1_IRQn);
Ellor1 0:538efd9574f7 69
Ellor1 0:538efd9574f7 70 // Start the timer
Ellor1 0:538efd9574f7 71 LPC_CT16B1->TCR = CT16B1_TCR_CEN; // enable
Ellor1 0:538efd9574f7 72
Ellor1 0:538efd9574f7 73 //for (
Ellor1 0:538efd9574f7 74
Ellor1 0:538efd9574f7 75 //if (LPC_CT16B1->TC == wait_n) {
Ellor1 0:538efd9574f7 76
Ellor1 0:538efd9574f7 77 // NVIC_DisableIRQ(TIMER_16_1_IRQn);
Ellor1 0:538efd9574f7 78
Ellor1 0:538efd9574f7 79 //return;
Ellor1 0:538efd9574f7 80
Ellor1 0:538efd9574f7 81 // }
Ellor1 0:538efd9574f7 82
Ellor1 0:538efd9574f7 83
Ellor1 0:538efd9574f7 84
Ellor1 0:538efd9574f7 85 // LPC_CT16B1->MR0 = wait_n;
Ellor1 0:538efd9574f7 86
Ellor1 0:538efd9574f7 87 }
Ellor1 0:538efd9574f7 88 */
Ellor1 0:538efd9574f7 89
Ellor1 0:538efd9574f7 90 /*
Ellor1 0:538efd9574f7 91 void LCD_Wait::Wait(int num_wait) {
Ellor1 0:538efd9574f7 92
Ellor1 0:538efd9574f7 93 wait_n = num_wait;
Ellor1 0:538efd9574f7 94 int x;
Ellor1 0:538efd9574f7 95 for (x = 0; x < wait_n; x++) {
Ellor1 0:538efd9574f7 96
Ellor1 0:538efd9574f7 97 }
Ellor1 0:538efd9574f7 98 x = 0;
Ellor1 0:538efd9574f7 99
Ellor1 0:538efd9574f7 100 }
Ellor1 0:538efd9574f7 101 */
Ellor1 0:538efd9574f7 102
Ellor1 0:538efd9574f7 103 /*
Ellor1 0:538efd9574f7 104 void LCD_Wait::_Wait_ISR(void)
Ellor1 0:538efd9574f7 105 {
Ellor1 0:538efd9574f7 106 instance->Wait_ISR();
Ellor1 0:538efd9574f7 107 }
Ellor1 0:538efd9574f7 108
Ellor1 0:538efd9574f7 109 void LCD_Wait::Wait_ISR(void) {
Ellor1 0:538efd9574f7 110
Ellor1 0:538efd9574f7 111 led2 = !led2;
Ellor1 0:538efd9574f7 112
Ellor1 0:538efd9574f7 113 // NVIC_DisableIRQ(TIMER_32_0_IRQn);
Ellor1 0:538efd9574f7 114 // NVIC_DisableIRQ(TIMER_32_1_IRQn);
Ellor1 0:538efd9574f7 115
Ellor1 0:538efd9574f7 116
Ellor1 0:538efd9574f7 117 NVIC_DisableIRQ(TIMER_16_1_IRQn);
Ellor1 0:538efd9574f7 118
Ellor1 0:538efd9574f7 119 LPC_CT16B1->IR = CT16B1_IR_MR0INT;
Ellor1 0:538efd9574f7 120
Ellor1 0:538efd9574f7 121 return;
Ellor1 0:538efd9574f7 122
Ellor1 0:538efd9574f7 123
Ellor1 0:538efd9574f7 124 }
Ellor1 0:538efd9574f7 125 */