Benjamin Ramberg Møklegård / ShiftOut Featured

A library for interfacing with the SN74HC595N Shift register. Includes functions for writing bits, bytes, animation and bits at spesified positions.

ShiftOut.cpp@0:e576e892f0ca, 2015-12-25 (annotated)

Committer:
benrammok
Date:
Fri Dec 25 11:59:15 2015 +0000
Revision:
0:e576e892f0ca
Child:
3:a0df8989ffa2
Added ability to write a bit to spesified position

Who changed what in which revision?

UserRevisionLine numberNew contents of line
benrammok 0:e576e892f0ca 1 #include "mbed.h"
benrammok 0:e576e892f0ca 2 #include "ShiftOut.h"
benrammok 0:e576e892f0ca 3
benrammok 0:e576e892f0ca 4
benrammok 0:e576e892f0ca 5 #define SET_LATCH() (LATCH = 0)
benrammok 0:e576e892f0ca 6 #define RESET_LATCH() (LATCH = 1)
benrammok 0:e576e892f0ca 7
benrammok 0:e576e892f0ca 8 #define ENABLE_RESET() (RESET = 0)
benrammok 0:e576e892f0ca 9 #define DISABLE_RESET() (RESET = 1)
benrammok 0:e576e892f0ca 10
benrammok 0:e576e892f0ca 11 static char stateArr[8] = {0};
benrammok 0:e576e892f0ca 12
benrammok 0:e576e892f0ca 13 ShiftOut::ShiftOut(PinName ser, PinName srclk, PinName rclk,
benrammok 0:e576e892f0ca 14 PinName oe, PinName reset) : DSERIAL(ser), LATCH(oe), SRCLK(srclk), RCLK(rclk), RESET(reset)
benrammok 0:e576e892f0ca 15 {
benrammok 0:e576e892f0ca 16 writeByte(0x00); // Reset the values of the registers to 0
benrammok 0:e576e892f0ca 17 if(RESET != NC){
benrammok 0:e576e892f0ca 18 DISABLE_RESET();
benrammok 0:e576e892f0ca 19 }
benrammok 0:e576e892f0ca 20 }
benrammok 0:e576e892f0ca 21
benrammok 0:e576e892f0ca 22 //Pulses the register
benrammok 0:e576e892f0ca 23 void ShiftOut::updateRegister(){
benrammok 0:e576e892f0ca 24 SRCLK = 1;
benrammok 0:e576e892f0ca 25 wait_us(2);
benrammok 0:e576e892f0ca 26 SRCLK = 0;
benrammok 0:e576e892f0ca 27 }
benrammok 0:e576e892f0ca 28
benrammok 0:e576e892f0ca 29 void ShiftOut::updateOutput(){
benrammok 0:e576e892f0ca 30 RCLK = 1;
benrammok 0:e576e892f0ca 31 wait_us(2);
benrammok 0:e576e892f0ca 32 RCLK = 0;
benrammok 0:e576e892f0ca 33 }
benrammok 0:e576e892f0ca 34
benrammok 0:e576e892f0ca 35 void ShiftOut::writeByte(unsigned char byte){
benrammok 0:e576e892f0ca 36 for(int i = 0; i<8; i++){
benrammok 0:e576e892f0ca 37 DSERIAL = (byte & 0x01<<i)>>i;
benrammok 0:e576e892f0ca 38 updateRegister();
benrammok 0:e576e892f0ca 39 }
benrammok 0:e576e892f0ca 40 updateOutput();
benrammok 0:e576e892f0ca 41 }
benrammok 0:e576e892f0ca 42
benrammok 0:e576e892f0ca 43 void ShiftOut::writeBit(unsigned char bit){
benrammok 0:e576e892f0ca 44 DSERIAL = bit & 0x01;
benrammok 0:e576e892f0ca 45 updateRegister();
benrammok 0:e576e892f0ca 46 updateOutput();
benrammok 0:e576e892f0ca 47 }
benrammok 0:e576e892f0ca 48
benrammok 0:e576e892f0ca 49 void ShiftOut::animate(int arr[][8], int lines, int delay_ms){
benrammok 0:e576e892f0ca 50 for(int i = 0; i < lines; i++){
benrammok 0:e576e892f0ca 51 for(int j = 0; j < 8; j++){
benrammok 0:e576e892f0ca 52 writeBit(arr[i][j]);
benrammok 0:e576e892f0ca 53 }
benrammok 0:e576e892f0ca 54 wait_ms(delay_ms);
benrammok 0:e576e892f0ca 55 }
benrammok 0:e576e892f0ca 56 }
benrammok 0:e576e892f0ca 57
benrammok 0:e576e892f0ca 58 void ShiftOut::animationExample(){
benrammok 0:e576e892f0ca 59 int strobe[][8]= {{1,0,0,0,0,0,0,0},
benrammok 0:e576e892f0ca 60 {0,1,0,0,0,0,0,0},
benrammok 0:e576e892f0ca 61 {0,0,1,0,0,0,0,0},
benrammok 0:e576e892f0ca 62 {0,0,0,1,0,0,0,0},
benrammok 0:e576e892f0ca 63 {0,0,0,0,1,0,0,0},
benrammok 0:e576e892f0ca 64 {0,0,0,0,0,1,0,0},
benrammok 0:e576e892f0ca 65 {0,0,0,0,0,0,1,0},
benrammok 0:e576e892f0ca 66 {0,0,0,0,0,0,0,1}};
benrammok 0:e576e892f0ca 67
benrammok 0:e576e892f0ca 68 int nightrider[18][8]= {{1,0,0,0,0,0,0,0},
benrammok 0:e576e892f0ca 69 {1,1,0,0,0,0,0,0},
benrammok 0:e576e892f0ca 70 {1,1,1,0,0,0,0,0},
benrammok 0:e576e892f0ca 71 {0,1,1,1,0,0,0,0},
benrammok 0:e576e892f0ca 72 {0,0,1,1,1,0,0,0},
benrammok 0:e576e892f0ca 73 {0,0,0,1,1,1,0,0},
benrammok 0:e576e892f0ca 74 {0,0,0,0,1,1,1,0},
benrammok 0:e576e892f0ca 75 {0,0,0,0,0,1,1,1},
benrammok 0:e576e892f0ca 76 {0,0,0,0,0,0,1,1},
benrammok 0:e576e892f0ca 77 {0,0,0,0,0,0,0,1},
benrammok 0:e576e892f0ca 78 {0,0,0,0,0,0,1,1},
benrammok 0:e576e892f0ca 79 {0,0,0,0,0,1,1,1},
benrammok 0:e576e892f0ca 80 {0,0,0,0,1,1,1,0},
benrammok 0:e576e892f0ca 81 {0,0,0,1,1,1,0,0},
benrammok 0:e576e892f0ca 82 {0,0,1,1,1,0,0,0},
benrammok 0:e576e892f0ca 83 {0,1,1,1,0,0,0,0},
benrammok 0:e576e892f0ca 84 {1,1,1,0,0,0,0,0},
benrammok 0:e576e892f0ca 85 {1,1,0,0,0,0,0,0}};
benrammok 0:e576e892f0ca 86
benrammok 0:e576e892f0ca 87 animate(nightrider, 18, 50);
benrammok 0:e576e892f0ca 88 wait(1);
benrammok 0:e576e892f0ca 89 animate(strobe, 8, 200);
benrammok 0:e576e892f0ca 90 }
benrammok 0:e576e892f0ca 91
benrammok 0:e576e892f0ca 92 void ShiftOut::writeBitAtPos(unsigned char pin, bool state){
benrammok 0:e576e892f0ca 93
benrammok 0:e576e892f0ca 94
benrammok 0:e576e892f0ca 95 if(pin < 8){
benrammok 0:e576e892f0ca 96 stateArr[pin] = state;
benrammok 0:e576e892f0ca 97 }
benrammok 0:e576e892f0ca 98 writeArray(stateArr);
benrammok 0:e576e892f0ca 99 }
benrammok 0:e576e892f0ca 100
benrammok 0:e576e892f0ca 101 void ShiftOut::writeArray(char arr[8]){
benrammok 0:e576e892f0ca 102 for(int i = 7; i >= 0; i--) {
benrammok 0:e576e892f0ca 103 writeBit(arr[i]);
benrammok 0:e576e892f0ca 104 }
benrammok 0:e576e892f0ca 105 }