mirror of https://github.com/joan2937/pigpio
132 lines
2.3 KiB
C
132 lines
2.3 KiB
C
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/i2c-dev.h>
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#include <ncurses.h> /* libncurses5-dev */
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/*
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2014-08-26 PCF8591.c
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sudo apt-get install libncurses5-dev
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gcc -o PCF8591 PCF8591.c -lcurses -lpigpio -lpthread
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sudo ./PCF8591
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*/
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/*
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Connect Pi 5V - VCC, Ground - Ground, SDA - SDA, SCL - SCL.
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*/
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#define PCF8591_I2C_ADDR 0x48
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/*
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P4 The thermister voltage is provided at AIN 1.
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P5 The photocell voltage is provided at AIN 0.
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P6 The single turn 10K ohm trim pot voltage is provided at AIN 3.
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*/
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/*
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7 6 5 4 3 2 1 0
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0 X X X 0 X X X
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A B B C D D
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0 1 0 0 0 1 0 0
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A 0 D/A inactive
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1 D/A active
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B 00 single ended inputs
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01 differential inputs
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10 single ended and differential
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11 two differential inputs
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C 0 no auto inc
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1 auto inc
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D 00 select channel 0
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01 select channel 1
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10 select channel 2
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11 select channel 3
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*/
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int main(int argc, char *argv[])
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{
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int i;
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int r;
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int handle;
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char aout;
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unsigned char command[2];
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unsigned char value[4];
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unsigned char str[8];
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int j;
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int key;
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if (gpioInitialise() < 0) return 1;
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initscr();
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noecho();
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cbreak();
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nodelay(stdscr, true);
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curs_set(0);
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printw("PCF8591 + or - to change aout, any other key to quit.");
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mvaddstr(10, 0, "Brightness");
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mvaddstr(12, 0, "Temperature");
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mvaddstr(14, 0, "?");
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mvaddstr(16, 0, "Resistor");
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refresh();
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handle = i2cOpen(1, PCF8591_I2C_ADDR, 0);
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command[1] = 0;
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aout = 128;
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while (1)
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{
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for (i=0; i<4; i++)
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{
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command[1] = aout;
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command[0] = 0x40 | ((i + 1) & 0x03); // output enable | read input i
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i2cWriteDevice(handle, &command, 2);
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usleep(20000);
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// the read is always one step behind the selected input
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value[i] = i2cReadByte(handle);
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sprintf(str, "%3d", value[i]);
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mvaddstr(10+i+i, 12, str);
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value[i] = value[i] / 4;
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move(10 + i + i, 16);
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for(j = 0; j < 64; j++)
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if(j < value[i]) addch('*'); else addch(' ');
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}
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refresh();
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key = getch();
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if ((key == '+') || (key == '=')) aout++;
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else if ((key == '-') || (key == '_')) aout--;
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else if (key != -1) break;
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}
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endwin();
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i2cClose(handle);
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gpioTerminate();
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return (0);
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}
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