PIC16F1938單片機編程樣例

1、PIC單片機編程樣例MCU:PIC16F1938;開發(fā)語言：C語言開發(fā)工具：編譯環(huán)境：MPLAB IED；C 編譯器：HI-TECH PICC C compiler編輯軟件：source insight燒錄工具：MPLAB ICD2仿真軟件：Protues說明：程序已經(jīng)通過編譯并在仿真軟件和硬件平臺上成功跑起來；目的：對用到PIC16F系列單片機開發(fā)軟件的群眾提供樣例支持，希望有幫助。Protues仿真圖：1、一些定義typedef void VOID;typedef bit BIT;typedef unsigned char UINT8;typedef int INT16;typedef u

2、nsigned int UINT16;typedef long INT32;typedef unsigned long UINT32;VOID delay( VOID )int i = 100;while( i- );2、EEPROM讀寫/*功 能：從EEPROM中讀取一個字節(jié)的數(shù)據(jù)原 型：UINT8 EEPROM_read( UINT8 addr )參數(shù)說明：輸入?yún)?shù)：addr 輸入地址 輸出參數(shù)：無返 回：讀取的字節(jié)注 意: */UINT8 EEPROM_read( UINT8 addr )UINT8 EE_data;EEADRL = addr;EEPGD = 0;CFGS = 0;GIE

3、 = 0; /禁止所有中斷RD = 1;asm("nop");EE_data = EEDATL;RD = 0;GIE = 1; /恢復(fù)所有中斷return EE_data;/*功 能：向EEPROM中寫入一個字節(jié)的數(shù)據(jù)原 型：VOID EEPROM_write( UINT8 addr, UINT8 ee_data )參數(shù)說明：輸入?yún)?shù)：addr 輸入地址，ee_data 需要寫入的數(shù)據(jù)輸出參數(shù)：無返 回：無注 意: */VOID EEPROM_write( UINT8 addr, UINT8 ee_data )EEADRL = addr;EEDATL = ee_data;E

4、EPGD = 0; CFGS = 0; GIE = 0; /禁止所有中斷WREN = 1; /運行執(zhí)行編程/擦除操作EECON2 = 0x55; /必須按這樣的時序EECON2 = 0xAA;WR = 1; while( WR=1 ); /等待寫操作完成 GIE = 1;WREN = 0; /禁止執(zhí)行編程/擦除操作3、ADC模塊/* ADC模塊的初始化 */static VOID ADC_init( VOID )ADCON0 = 0b00110001; /選擇AN12通道、ADC使能位ADCON1 = 0b11100000; /AD轉(zhuǎn)換結(jié)果右對齊，64分頻作為轉(zhuǎn)換時鐘，選擇VSS，VDD作為參

5、考電壓ADIF = 0; /清楚AD轉(zhuǎn)換標(biāo)志static UINT16 throttle = 0;static VOID AD_Function( VOID )UINT8 i;UINT16 AD_result;UINT16 AD_max = 0;UINT16 AD_min = 2000;throttle = 0;for( i=0; i<AD_NUM; i+ )ADIF = 0;ADRESH = 0;ADRESL = 0;delay();ADCON0 |= 0x02;while( 0 = ADIF ); /等待轉(zhuǎn)換完成ADIF = 0;AD_result = ADRESH;AD_resul

6、t = AD_result << 8;AD_result = AD_result | ADRESL;throttle += AD_result;AD_max = AD_max > AD_result ? AD_max : AD_result;AD_min = AD_min < AD_result ? AD_min : AD_result;throttle = (throttle - AD_max - AD_min) / (AD_NUM - 2); /去掉最大值和最小值，均值濾波4、定時器0/* 定時器0初始化 */static VOID Timer0_init(VOID

7、)OPTION_REG = 0b10000100; /禁止所有弱上拉、內(nèi)部指令周期時鐘32分頻TMR0 = TIMER0_1MS; /定時器0的中斷間隔為1msTMR0IE = 1; /定時器0開中斷/總的中斷開關(guān)記得在所有模塊初始化完成后打開static UINT8 timecount = 0;static BIT time10msflg;static BIT time1msflg;VOID interrupt ISR(VOID)uart_handler(); /串口通訊接收/* 定時器0的處理 */if( 1 = TMR0IF )TMR0IF = 0; /清零標(biāo)志位TMR0 = TIMER

8、0_1MS; /重新賦值timecount+;if( timecount >= 10 )timecount = 0; time10msflg = 1;time1msflg = 1;/根據(jù)實際情況添加自己的代碼5、IO初始化/* IO 初始化 */static VOID IO_init(VOID)/* PORT A */ANSELA = 0x00; /所有IO為數(shù)字IOTRISA = 0x00; /所有IO為outputPORTA = 0x00; /初始化所有IO輸出電平為低電平/* PORT B */ANSELB = 0x03; /RB0和RB1都綁定為同一模擬AD輸入TRISB = 0

9、X03; /RB0和RB1為輸入，其他端口為輸出PORTB = 0x00;/* POTR C */PORTC =0xff; LATC = 0xff;TRISC =0xC4; /TX和RX引腳都要設(shè)置為1，禁止CCP1引腳輸出驅(qū)動器6、PWM模塊/* PWM模塊的初始化 */static VOID PWMCCP_init(VOID)CCP1CON = 0b00001100; /單輸出,PWM模式CCPTMRS0 &= 0b11111100; /CCP1選擇Timer2作為定時器PR2 = 249; /PWM周期計算:(PR2 + 1)*0.0625*4(16Mhz晶振四分頻，即指令周期)

10、*預(yù)分頻值，當(dāng)PR2為249時，PWM頻率為16KT2CON = 0x00; /預(yù)分頻為1:1；TMR2ON = 1; /使能定時器Timer2TRISC2 = 0; /打開CCP1引腳輸出驅(qū)動器CCPR1L = 0x00; /PWM占空比為0CCP1CON &= 0b11001111;/*功 能：PWM占空比設(shè)置原 型：VOID PWM_WidthSet( UINT8 width )參數(shù)說明：輸入?yún)?shù)：width 占空比的百分比分子，設(shè)置值從0至100，例如width = 50時，設(shè)置的占空比為50% 輸出參數(shù)：無返 回：無注 意: */static VOID PWM_WidthSe

11、t( UINT8 width )UINT16 PWM_width;UINT16 tmp;PWM_width = width * 10;if( 100 = width )/經(jīng)過Protues仿真，100時至少比1000大于4才可以達到完全的100PWM_width += 4;/* 高八位賦值 */CCPR1L = PWM_width >> 2 ;/* 低兩位賦值 */tmp = PWM_width & 0x0003;tmp = tmp << 4;CCP1CON &= 0b11001111;CCP1CON |= tmp;7、串口通訊模塊void uart_i

12、nit(void) UINT8 ii;for(ii=0;ii<_SUB_NUM_;ii+)get_uart_subii=0xff; RCSTA = 0xb0; TXSTA = 0x20; /add by lihf for test/TXSTA = 0x20; BAUDCONbits.BRG16=0; SPBRGH = 0; /8 位定時器 Baud Rate GeneratorSPBRG = _FOSC_/64/_BAUD_-1; /23;TXIE = 0; /發(fā)送不需要中斷處理RCIE = 1;PEIE = 1; /沒有開全局中斷 /發(fā)送數(shù)據(jù)static VOID UART_sent(

13、 UINT8 byte )/while( 0 = TXIF )/continue;TXREG = byte;while( 0 = TRMT )asm("nop");/接收在中斷里面調(diào)用uart_handler()函數(shù)#define _SUB_NUM_ 50UINT8 get_uart_sub_SUB_NUM_;void uart_handler(void) UINT8 i;if( 1 = RCIF )RCIF = 0;for(i=0;i<_SUB_NUM_-1;i+) get_uart_subi=get_uart_subi+1;get_uart_sub_SUB_NUM_