István Cserny / Mbed 2 deprecated Lab07_RTOS_display

RTOS example - multiplex display on a 4-digit 7-segment LED tube driven by two 74HC595 shift registers. Hardware: NUCLEO_F446RE board with Arduino Multifunction Shield. The ShiftOut Library by Ollie Milton was applied.

Dependencies:   mbed mbed-rtos ShiftOut

main.cpp@0:2ae7b6b39e93, 2022-02-24 (annotated)

Committer:
cspista
Date:
Thu Feb 24 07:52:29 2022 +0000
Revision:
0:2ae7b6b39e93
RTOS example - multiplex display on a four digit, 7-segment display. ; Hardware: NUCLEO-F446RE board and Arduino Multifunctional Shield (3461B type 7-segment LED display driven by two 74HC595 shift registers).

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cspista 0:2ae7b6b39e93 1 #include "mbed.h"
cspista 0:2ae7b6b39e93 2 #include "rtos.h"
cspista 0:2ae7b6b39e93 3 #include "ShiftOut.h" // Ollie Milton, https://os.mbed.com/users/ollie8/code/ShiftOut/
cspista 0:2ae7b6b39e93 4 uint8_t segment_data[4] = {0xFF, 0xFF, 0xFF, 0xFF}; // A frissítendő szegmenskép
cspista 0:2ae7b6b39e93 5 /* Számjegyek (0 – 9) szegmensképe, negatív logikával */
cspista 0:2ae7b6b39e93 6 const uint8_t SEGMENT_MAP[]= {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
cspista 0:2ae7b6b39e93 7 /* Számjegy (1 - 4) kiválasztó jelek */
cspista 0:2ae7b6b39e93 8 const uint8_t SEGMENT_SELECT[] = {0x01, 0x02, 0x04, 0x08};
cspista 0:2ae7b6b39e93 9
cspista 0:2ae7b6b39e93 10 Thread thread;
cspista 0:2ae7b6b39e93 11 DigitalOut buzzer(D3);
cspista 0:2ae7b6b39e93 12
cspista 0:2ae7b6b39e93 13 void led2_thread()
cspista 0:2ae7b6b39e93 14 {
cspista 0:2ae7b6b39e93 15 ShiftOut display(D7, D8, D4); // clk=D7, data=D8, latch=D4)
cspista 0:2ae7b6b39e93 16 while (true) {
cspista 0:2ae7b6b39e93 17 for(int i = 0; i<4; i++) {
cspista 0:2ae7b6b39e93 18 display.write(segment_data[i]);
cspista 0:2ae7b6b39e93 19 display.write(SEGMENT_SELECT[i]);
cspista 0:2ae7b6b39e93 20 Thread::wait(2);
cspista 0:2ae7b6b39e93 21 }
cspista 0:2ae7b6b39e93 22 }
cspista 0:2ae7b6b39e93 23 }
cspista 0:2ae7b6b39e93 24
cspista 0:2ae7b6b39e93 25 int main()
cspista 0:2ae7b6b39e93 26 {
cspista 0:2ae7b6b39e93 27 int n =0;
cspista 0:2ae7b6b39e93 28 buzzer = true;
cspista 0:2ae7b6b39e93 29 thread.start(led2_thread);
cspista 0:2ae7b6b39e93 30
cspista 0:2ae7b6b39e93 31 while (true) {
cspista 0:2ae7b6b39e93 32 segment_data[0] = SEGMENT_MAP[(n/1000) %10];
cspista 0:2ae7b6b39e93 33 segment_data[1] = SEGMENT_MAP[(n/100) % 10];
cspista 0:2ae7b6b39e93 34 segment_data[2] = SEGMENT_MAP[(n/10) % 10];
cspista 0:2ae7b6b39e93 35 segment_data[3] = SEGMENT_MAP[n % 10];
cspista 0:2ae7b6b39e93 36 n = n+1;
cspista 0:2ae7b6b39e93 37 buzzer = (n%100) != 0;
cspista 0:2ae7b6b39e93 38 Thread::wait(250);
cspista 0:2ae7b6b39e93 39 }
cspista 0:2ae7b6b39e93 40 }