PWM.rar_c8051f340_pwm_单片机设置

#include "c8051f340.h" #define SYSCLK 48000000 // 系统工作频率 #define BAUDRATE 9600 // baud rate sbit L1=P0^0; sbit S1=P3^5; sbit S2=P3^4; void delay( unsigned n); void PORT_Init (void); void Sysclk_Init(void); void UART0_Init(void); void sendchar(unsigned char x); void GetADvalue(void); void ADC0_Init (void); unsigned char code ascii[]={"0123456789ABCDEF"}; void T2_Init(void); void T2_Interrupt(void); void PCA_Init(void); int i = 200; char j = 50; unsigned int duty_cycle; void main() { PCA0MD =0x00; //看门狗 bf Sysclk_Init(); PORT_Init(); UART0_Init(); ADC0_Init(); T2_Init(); PCA_Init(); while(1) { if(S1==0) { delay(50); if(S1==0) { while(S1==0); j=j+5; if (j>100) { j=100; } duty_cycle=655.36*(100-j); PCA0CPL0 = (duty_cycle & 0x00FF); PCA0CPH0 = (duty_cycle & 0xFF00)>>8; } } if(S2==0) { delay(50); if(S2==0) { while(S2==0); j=j-5; if (j<=0) { j=0; PCA0CPM0 &=0xbf; } else { PCA0CPM0 |=0x40; duty_cycle=655.36*(100-j); PCA0CPL0 = (duty_cycle & 0x00FF); PCA0CPH0 = (duty_cycle & 0xFF00)>>8; } } } sendchar(ascii[(j)/100]); sendchar(ascii[(j%100)/10]); sendchar(ascii[(j%100)%10]); sendchar(0X0A); if (i==0) { GetADvalue(); i=200; } } } void PCA_Init(void) { PCA0CN = 0x40; PCA0CPM0 = 0xCB; duty_cycle=655.36*(100-j); PCA0CPL0 = (duty_cycle & 0x00FF); PCA0CPH0 = (duty_cycle & 0xFF00)>>8; } void T2_Init(void) { IE = 0x00; TR2 = 0; PT2 = 1; PS0=0; CKCON = 0x00; TMR2RLH = 0xB1; TMR2RLL = 0XE0; TMR2CN = 0x84; TR2 = 1; IE = 0xff; } void T2_Interrupt(void) interrupt 5 { --i; TF2H=0; } void UART0_Init(void) { EA=0; RI0 = 0; TI0 = 0; TR1=0; SCON0 |= 0x10; CKCON = 0x00; TH1 = 0x30; TL1 = 0X30; TMOD = 0x20; //21.1.4 TR1=1; EA=1; } void ADC0_Init (void) { ADC0CF = 0x78; ADC0CN = 0x80; REF0CN = 0x03; AMX0P = 0x00; AMX0N = 0xff; //GND 单端方式 } void GetADvalue() { int ad_value,d_value; AD0INT=0; AD0BUSY=1;//启动AD转换 while(!AD0INT); { ad_value=ADC0H; ad_value<<=8; ad_value+=ADC0L;//AD转换结果 d_value=2.44*ad_value/1024*1000; sendchar(ascii[(d_value)/1000]); sendchar(0X2E); sendchar(ascii[(d_value%1000)/100]); sendchar(ascii[(d_value%1000)%100/10]); sendchar(ascii[(d_value%1000)%100%10]); sendchar(0X0A); } } void PORT_Init(void) { P0MDIN |= 0xff; P0MDOUT |= 0xff; P0SKIP |= 0xce; P2MDIN = 0xfe; P2SKIP = 0xff; P3MDIN |= 0xff; P3 |= 0xff; P3SKIP |= 0xff; XBR0 = 0x01; XBR1 = 0x41; XBR2 = 0x00; } void sendchar(unsigned char x) { SBUF0 = x; while(!TI0); TI0 = 0; } void Sysclk_Init(void) { OSCICN |= 0x03; // Configure internal oscillator for // its maximum frequency and enable // missing clock detector CLKMUL = 0x00; // Select internal oscillator as // input to clock multiplier CLKMUL |= 0x80; // Enable clock multiplier delay(50); // Delay for clock multiplier to begin CLKMUL |= 0xC0; // Initialize the clock multiplier delay(50); // Delay for clock multiplier to begin while(!(CLKMUL & 0x20)); // Wait for multiplier to lock CLKSEL = 0x03; // Set sys clock to clkmul } void delay(unsigned n) { unsigned i,j; for(i=0;i<n;i++) { for(j=0;j<100;j++); } }