Steven Kay / Latch_FET_Driver

Driver to control a peripheral circuit being controlled by the operation of a FET. Inbetween the mbed and FET is a single D type latch, used to latch a signal to the driver.

Latch_FET_Driver.cpp@7:909d7e3822d8, 2016-03-10 (annotated)

Committer:
sk398
Date:
Thu Mar 10 16:25:15 2016 +0000
Revision:
7:909d7e3822d8
Parent:
5:7d1b124490ed 
Delay time updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sk398 7:909d7e3822d8 1 /* #####################################################################
sk398 7:909d7e3822d8 2 Latch_FET_Driver.cpp
sk398 7:909d7e3822d8 3 --------------------------
sk398 7:909d7e3822d8 4
sk398 7:909d7e3822d8 5 Surface Ship, Group 5
sk398 7:909d7e3822d8 6 ---------------------
sk398 7:909d7e3822d8 7
sk398 7:909d7e3822d8 8 Written by: Steven Kay
sk398 7:909d7e3822d8 9
sk398 7:909d7e3822d8 10 Date: February 2016
sk398 7:909d7e3822d8 11
sk398 7:909d7e3822d8 12 Function: This
sk398 7:909d7e3822d8 13
sk398 7:909d7e3822d8 14 Version: 1.0
sk398 7:909d7e3822d8 15
sk398 7:909d7e3822d8 16 Version History
sk398 7:909d7e3822d8 17 ---------------
sk398 7:909d7e3822d8 18
sk398 7:909d7e3822d8 19 1.1 rgdfgdfgdfggdfgdg
sk398 7:909d7e3822d8 20
sk398 7:909d7e3822d8 21 1.0 gdgddfdddgd
sk398 7:909d7e3822d8 22
sk398 7:909d7e3822d8 23 ##################################################################### */
sk398 7:909d7e3822d8 24
sk398 0:87f2d094bea3 25 #include "mbed.h"
sk398 0:87f2d094bea3 26 #include "Latch_FET_Driver.h"
sk398 0:87f2d094bea3 27
sk398 5:7d1b124490ed 28
sk398 5:7d1b124490ed 29 /* =============================================================
sk398 5:7d1b124490ed 30 Latch_FET_Driver constructor
sk398 5:7d1b124490ed 31
sk398 5:7d1b124490ed 32 Inputs
sk398 5:7d1b124490ed 33 ------
sk398 5:7d1b124490ed 34 PinName D: Pin to create D input to D Latch
sk398 5:7d1b124490ed 35 PinName CLK: Pin to create CLK input to D Latch
sk398 5:7d1b124490ed 36
sk398 5:7d1b124490ed 37 Description
sk398 5:7d1b124490ed 38 -----------
sk398 5:7d1b124490ed 39
sk398 5:7d1b124490ed 40 Once the new DigitalOut types are assigned, the D Latch at
sk398 5:7d1b124490ed 41 the given Pins is initialised to an outputLow state, ensuring
sk398 5:7d1b124490ed 42 that uopn setup, a known state is entered quickly.
sk398 5:7d1b124490ed 43
sk398 5:7d1b124490ed 44 ============================================================= */
sk398 5:7d1b124490ed 45 Latch_FET_Driver::Latch_FET_Driver(PinName D,PinName CLK)
sk398 0:87f2d094bea3 46 {
sk398 5:7d1b124490ed 47 // Assign passed in Pin Names as new DigitalOut data types
sk398 5:7d1b124490ed 48 _D = new DigitalOut(D);
sk398 5:7d1b124490ed 49 _CLK = new DigitalOut(CLK);
sk398 5:7d1b124490ed 50
sk398 5:7d1b124490ed 51 // Ensure that D latch does not enter unknown state
sk398 5:7d1b124490ed 52 // Initialise is the same as the outputLow method
sk398 5:7d1b124490ed 53 Latch_FET_Driver::outputLow();
sk398 0:87f2d094bea3 54 }
sk398 0:87f2d094bea3 55
sk398 5:7d1b124490ed 56 /* ================================================================
sk398 5:7d1b124490ed 57 outputHigh is a public method to set a HIGH output on the given
sk398 5:7d1b124490ed 58 D Latch.
sk398 5:7d1b124490ed 59
sk398 5:7d1b124490ed 60 The procedure to set Q into a HIGH condition is as follows;
sk398 5:7d1b124490ed 61
sk398 5:7d1b124490ed 62 1. Ensure CLK is low
sk398 5:7d1b124490ed 63 2. Set D high
sk398 5:7d1b124490ed 64 3. wait STATE_DELAY us
sk398 5:7d1b124490ed 65 4. Set CLK high
sk398 5:7d1b124490ed 66 5. wait 10*STATE_DELAY us
sk398 5:7d1b124490ed 67 6. Set CLK low
sk398 5:7d1b124490ed 68 7. wait STATE_DELAY us
sk398 5:7d1b124490ed 69 8. set D low
sk398 5:7d1b124490ed 70 9. return void
sk398 5:7d1b124490ed 71 ================================================================ */
sk398 5:7d1b124490ed 72 void Latch_FET_Driver::outputHigh()
sk398 0:87f2d094bea3 73 {
sk398 5:7d1b124490ed 74 _CLK -> write(LOW);
sk398 5:7d1b124490ed 75 _D -> write(HIGH);
sk398 5:7d1b124490ed 76 wait_us(STATE_DELAY);
sk398 5:7d1b124490ed 77 _CLK -> write(HIGH);
sk398 5:7d1b124490ed 78 wait_us(10*STATE_DELAY);
sk398 5:7d1b124490ed 79 _CLK -> write(LOW);
sk398 5:7d1b124490ed 80 wait_us(STATE_DELAY);
sk398 5:7d1b124490ed 81 _D -> write(LOW);
sk398 0:87f2d094bea3 82 }
sk398 0:87f2d094bea3 83
sk398 5:7d1b124490ed 84 /* ================================================================
sk398 5:7d1b124490ed 85 outputLow is a public method to set a HIGH output on the given
sk398 5:7d1b124490ed 86 D Latch.
sk398 5:7d1b124490ed 87
sk398 5:7d1b124490ed 88 The procedure to set Q into a LOW condition is as follows;
sk398 5:7d1b124490ed 89
sk398 5:7d1b124490ed 90 1. Ensure CLK is low
sk398 5:7d1b124490ed 91 2. Set D low
sk398 5:7d1b124490ed 92 3. wait STATE_DELAY us
sk398 5:7d1b124490ed 93 4. Set CLK high
sk398 5:7d1b124490ed 94 5. wait 10*STATE_DELAY us
sk398 5:7d1b124490ed 95 6. Set CLK low
sk398 5:7d1b124490ed 96 7. wait STATE_DELAY us
sk398 5:7d1b124490ed 97 8. return void
sk398 5:7d1b124490ed 98 ================================================================ */
sk398 5:7d1b124490ed 99 void Latch_FET_Driver::outputLow()
sk398 5:7d1b124490ed 100 {
sk398 5:7d1b124490ed 101 _CLK -> write(LOW);
sk398 5:7d1b124490ed 102 _D -> write(LOW);
sk398 5:7d1b124490ed 103 wait_us(STATE_DELAY);
sk398 5:7d1b124490ed 104 _CLK -> write(HIGH);
sk398 5:7d1b124490ed 105 wait_us(10*STATE_DELAY);
sk398 5:7d1b124490ed 106 _CLK -> write(LOW);
sk398 5:7d1b124490ed 107 wait_us(STATE_DELAY);
sk398 5:7d1b124490ed 108 }
sk398 2:9059b675917e 109
sk398 5:7d1b124490ed 110