marco valli / Shifter

shift register

Dependents:   Enrico_newproject

Shifter.cpp@0:7af9b977e6e9, 2018-02-21 (annotated)

Committer:
billycorgan123
Date:
Wed Feb 21 19:37:59 2018 +0000
Revision:
0:7af9b977e6e9
rev1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
billycorgan123 0:7af9b977e6e9 1 // Include the standard types
billycorgan123 0:7af9b977e6e9 2 #include "Shifter.h"
billycorgan123 0:7af9b977e6e9 3
billycorgan123 0:7af9b977e6e9 4 #define LOW 0
billycorgan123 0:7af9b977e6e9 5 #define HIGH 1
billycorgan123 0:7af9b977e6e9 6 DigitalOut SER_Pin(D4);
billycorgan123 0:7af9b977e6e9 7 DigitalOut RCLK_Pin(D3);
billycorgan123 0:7af9b977e6e9 8 DigitalOut SRCLK_Pin(D2);
billycorgan123 0:7af9b977e6e9 9 int Number_of_Registers=2;
billycorgan123 0:7af9b977e6e9 10
billycorgan123 0:7af9b977e6e9 11 void Shifter::write()
billycorgan123 0:7af9b977e6e9 12 {
billycorgan123 0:7af9b977e6e9 13 //Set and display registers
billycorgan123 0:7af9b977e6e9 14 //Only call AFTER all values are set how you would like (slow otherwise)
billycorgan123 0:7af9b977e6e9 15 RCLK_Pin.write(LOW);
billycorgan123 0:7af9b977e6e9 16
billycorgan123 0:7af9b977e6e9 17 //iterate through the registers
billycorgan123 0:7af9b977e6e9 18 for(int i = Number_of_Registers - 1; i >= 0; i--)
billycorgan123 0:7af9b977e6e9 19 {
billycorgan123 0:7af9b977e6e9 20 //iterate through the bits in each registers
billycorgan123 0:7af9b977e6e9 21 for(int j = 8 - 1; j >= 0; j--)
billycorgan123 0:7af9b977e6e9 22 {
billycorgan123 0:7af9b977e6e9 23 SRCLK_Pin.write(LOW);
billycorgan123 0:7af9b977e6e9 24 wait_us(1);
billycorgan123 0:7af9b977e6e9 25 int val = shiftRegisters[i] & (1 << j);
billycorgan123 0:7af9b977e6e9 26 SER_Pin.write(val);
billycorgan123 0:7af9b977e6e9 27 wait_us(1);
billycorgan123 0:7af9b977e6e9 28 SRCLK_Pin.write(HIGH);
billycorgan123 0:7af9b977e6e9 29 }
billycorgan123 0:7af9b977e6e9 30
billycorgan123 0:7af9b977e6e9 31 }
billycorgan123 0:7af9b977e6e9 32 RCLK_Pin.write(HIGH);
billycorgan123 0:7af9b977e6e9 33 }
billycorgan123 0:7af9b977e6e9 34
billycorgan123 0:7af9b977e6e9 35 void Shifter::setPin(int index, bool val)
billycorgan123 0:7af9b977e6e9 36 {
billycorgan123 0:7af9b977e6e9 37 int byteIndex = index/8;
billycorgan123 0:7af9b977e6e9 38 int bitIndex = index % 8;
billycorgan123 0:7af9b977e6e9 39 char current = shiftRegisters[byteIndex];
billycorgan123 0:7af9b977e6e9 40 current &= ~(1 << bitIndex); //clear the bit
billycorgan123 0:7af9b977e6e9 41 current |= val << bitIndex; //set the bit
billycorgan123 0:7af9b977e6e9 42 shiftRegisters[byteIndex] = current; //set the value
billycorgan123 0:7af9b977e6e9 43 }
billycorgan123 0:7af9b977e6e9 44
billycorgan123 0:7af9b977e6e9 45 void Shifter::setAll(bool val)
billycorgan123 0:7af9b977e6e9 46 {
billycorgan123 0:7af9b977e6e9 47 //set all register pins to LOW
billycorgan123 0:7af9b977e6e9 48 for(int i = Number_of_Registers * 8 - 1; i >= 0; i--){ setPin(i, val); }
billycorgan123 0:7af9b977e6e9 49 }
billycorgan123 0:7af9b977e6e9 50
billycorgan123 0:7af9b977e6e9 51 void Shifter::clear()
billycorgan123 0:7af9b977e6e9 52 {
billycorgan123 0:7af9b977e6e9 53 //set all register pins to LOW
billycorgan123 0:7af9b977e6e9 54 for(int i = Number_of_Registers * 8 - 1; i >= 0; i--){ setPin(i, LOW); }
billycorgan123 0:7af9b977e6e9 55 }