AT89C52 Single Chip Microcomputer Design of Eight Road Voltage Meter

Eight-circuit voltmeter C procedure / * Using the AT89C52 single-chip microcomputer, 12MHz crystal, P0-port read into the AD value, P2 port as AD control, use common Yang LED digital tube P1 port output segment code, P3 scan, the highest bit indicator channel (0-7). * / #include "reg52.h" // 52 series single-chip definition file #include "intrins.h" // call _nop_(); delay function # Definead_conp2 // AD Control Port # DefineadDataP0 // AD data is included in the entry # definedISDataP1 // Display data segment code output port # DefineucharunsignedChar // No symbolic characters (8 digits) # defineuintunsignedint // No symbol integer (16 digits) sbitale = p2 ^ 3; // Lock address control bit SBitStart = P2 ^ 4; // Start a transition bit SBITOE = P2 ^ 5; // 0809 Output Data Control Bit SBiteoc = P3 ^ 7; // Conversion end flag SBITDISX = DISDATA ^ 7; // LED decimal point Ucharcodedis_7 [11] = {0xc0, 0xF9, 0XA4, 0X999, 0X92, 0X82, 0XF8, 0X80, 0X90, 0xFF}; / * The common sun seven LED segment code table "0" "1" "2" "3" "4" "5" "7" "8" "9" "No" * / Ucharcodescan_con [4] = {0xFE, 0xFD, 0xFb, 0xF7}; // Tourum scan control word Uchardataad_data [8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; // Define 8 Data Memory Unit UintDataDis [5] = {0x00, 0x00, 0x00, 0x00, 0x00}; // Define 4 display data units, 1 data temporary unit // // / ******** 1 millisecond delay subunies ********** / DELAY1MS (UINTT) { Uinti, J; For (i = 0; ifor (j = 0; J "120; J ++) ; } // // / *********** Display Scan Subfix ********** / SCAN () { Uchark, n; INTH; DIS [3] = 0x00; // The terminal value is 0 For (n = 0; n "8; n ++) / / 8 data each time { DIS [2] = ad_data [n] / 51; // measured value converted to three BCD code, up to 5.00V DIS [4] = ad_data [n]% 51; // Whealth Dis [4] = DIS [4] * 10; // Calculate the first digit DIS [1] = DIS [4] / 51; // DIS [4] = DIS [4]% 51; // Dis [4] = Dis [4] * 10; // Calculate the second bit of the decimal DIS [0] = DIS [4] / 51; // For (h = 0; h "500; h ++) // Each channel value display time control (about 1 second) { FOR (k = 0; k "4; k ++) // four LED scan control { DISDATA = DIS_7 [DIS [k]]; IF (k == 2) {DISX = 0;} P3 = scan_con [k]; delay1ms (1); p3 = 0xFF; } } DIS [3] ++; // channel value plus 1 } } // // / ******* 0809AD conversion subunies *********** / Test () { Ucharm; Uchars = 0x00; AD_CON = S; For (m = 0; m "8; m ++) { Ale = 1; _nop _(); _nop _(); ale = 0; // Convert channel address latch START = 1; _nop _(); _nop _(); start = 0; // Start conversion command _nop _(); _nop _(); _NOP _(); _nop _(); // delay 4 microseconds While (EOC == 0); // Waiting for the end of the conversion OE = 1; ad_data [m] = addata; OE = 0; s ++; ad_con = s; // Take AD value, address plus 1 } AD_CON = 0x00; // Control reset } // // / ************* Main function **************** / Main () { P0 = 0xFF; // Initializing port P2 = 0x00; P1 = 0xFF; P3 = 0xFF; While (1) { SCAN (); // Show 8 channel values once Test (); // Measurement conversion once } } // // //*********************end************************** //, read the full story