mickoC 編寫pic18f45k22讀取i2c接口RTC pcf8583時間顯示在數碼管，附仿真。
仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
51hei.png (17.11 KB, 下載次數: 99)
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2020-6-10 04:04 上傳
單片機源程序如下:
- /*
- * Project name:
- Seven Segment Display (The 'Hello World' example for the Seven Segment Display)
- * Copyright:
- (c) Mikroelektronika, 2011.
- * Revision History:
- 20110929:
- - initial release (FJ);
- * Description:
- This code demonstrates how to display number on one 7-segment display
- (common cathode). Display is connected to PORTD (RD0..RD7, segment A to
- RD0, segment B to RD1, etc); common cathode is connected to the pin RA0 on
- PORTA. Number is incremented every 1s.
- * NOTES:
- - Turn on Seven Segment Display switches SW4.1, SW4.2, SW4.3 and SW4.4. (board specific)
- */
- #include "Display_Utils.h"
- //unsigned short portd_index;
- char seconds, minutes, hours, day, month, year; // Global date/time variables
- char i;
- // Software I2C connections
- /*sbit Soft_I2C_Scl at RC3_bit;
- sbit Soft_I2C_Sda at RC4_bit;
- sbit Soft_I2C_Scl_Direction at TRISC3_bit;
- sbit Soft_I2C_Sda_Direction at TRISC4_bit;
- */
- // End Software I2C connections
- //--------------------- Reads time and date information from RTC (PCF8583)
- void Read_Time() {
- I2C1_Start(); // Issue start signal
- I2C1_Wr(0xA0); // Address PCF8583, see PCF8583 datasheet
- I2C1_Wr(2); // Start from address 2
- I2C1_Repeated_Start(); // issue I2C signal repeated start
- //I2C1_Start(); // Issue repeated start signal
- I2C1_Wr(0xA1); // Address PCF8583 for reading R/W=1
- seconds = I2C1_Rd(1); // Read seconds byte
- minutes = I2C1_Rd(1); // Read minutes byte
- hours = I2C1_Rd(1); // Read hours byte
- day = I2C1_Rd(1); // Read year/day byte
- month = I2C1_Rd(0); // Read weekday/month byte
- I2C1_Stop(); // Issue stop signal
- }
- //-------------------- Formats date and time
- void Transform_Time() {
- seconds = ((seconds & 0xF0) >> 4)*10 + (seconds & 0x0F); // Transform seconds
- minutes = ((minutes & 0xF0) >> 4)*10 + (minutes & 0x0F); // Transform months
- hours = ((hours & 0xF0) >> 4)*10 + (hours & 0x0F); // Transform hours
- year = (day & 0xC0) >> 6; // Transform year
- day = ((day & 0x30) >> 4)*10 + (day & 0x0F); // Transform day
- month = ((month & 0x10) >> 4)*10 + (month & 0x0F); // Transform month
- }
- /*
- void interrupt() {
- LATD = 0; // Turn off all 7seg displays
- LATD = mask(hours/10u); // bring appropriate value to PORTD
- LATA = 0b011111; // turn on appropriate 7seg. display
- Delay_ms(2);
- LATD=0;
- LATD = mask(hours%10u);
- LATA = 0b101111;
- Delay_ms(2);
- LATD=0;
- LATD = mask(minutes/10u);
- LATA = 0b110111;
- Delay_ms(2);
- LATD=0;
- LATD = mask(minutes%10u);
- LATA = 0b111011;
- Delay_ms(2);
- LATD=0;
- LATD = mask(seconds/10u);
- LATA = 0b111101;
- Delay_ms(2);
- LATD=0;
- LATD = mask(seconds%10u);
- LATA = 0b111110;
- Delay_ms(2);
- LATD=0;
- TMR0L = 0; // reset TIMER0 value
- TMR0IF_bit = 0; // Clear TMR0IF
- } */
- void main() {
- ANSELA = 0; // Configure PORTA pins as digital
- ANSELD = 0; // Configure PORTD pins as digital
- TRISA = 0; // Configure PORTA as output
- LATA = 0; // Clear PORTA
- TRISD = 0; // Configure PORTD as output
- LATD = 0; // Clear PORTD
- //T0CON = 0xC4; // Set TMR0 in 8bit mode, assign prescaler to TMR0
- //TMR0L = 0; // clear TMROL
- //GIE_bit = 1;
- //TMR0IE_bit = 1;
- I2C1_Init(100000); // initialize I2C communication
- //Soft_I2C_Init(); // Initialize Soft I2C communication
- do {
- Read_Time(); // Read time from RTC(PCF8583)
- Transform_Time(); // Format date and time
- for (i=0;i<32;i++)
- {
- LATD = 0; // Turn off all 7seg displays
- LATD = mask(hours/10u); // bring appropriate value to PORTD
- LATA = 0b011111; // turn on appropriate 7seg. display
- Delay_ms(20);
- LATD=0;
- LATD = mask(hours%10u);
- LATA = 0b101111;
- Delay_ms(20);
- LATD=0;
- LATD = mask(minutes/10u);
- LATA = 0b110111;
- Delay_ms(20);
- LATD=0;
- LATD = mask(minutes%10u);
- LATA = 0b111011;
- Delay_ms(20);
- LATD=0;
- LATD = mask(seconds/10u);
- LATA = 0b111101;
- Delay_ms(20);
- LATD=0;
- LATD = mask(seconds%10u);
- LATA = 0b111110;
- Delay_ms(20);
- LATD=0;
- }
- //Delay_ms(4000); // one second delay
- } while(1); // endless loop
- }
51hei.png (8.9 KB, 下載次數: 109)
下載附件
2020-6-10 04:05 上傳
所有資料51hei提供下載:
pic18f45k22 led rtc.zip
(61.09 KB, 下載次數: 16)
2020-6-9 07:38 上傳
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下載積分: 黑幣 -5
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