STC半硬件实现12位PWM

#include "reg52.h" #include <intrins.h> #include "STC12C5612AD.h" unsigned char Red_H; unsigned char Red_L; unsigned char Green_H; unsigned char Green_L; unsigned char Blue_H; unsigned char Blue_L; sbit P3_7 = P3^7; //PWM1 R sbit P2_4 = P2^4; //PWM2 G sbit P3_5 = P3^5; //PWM3 B sbit P0_0 = P0^0; sbit P0_1 = P0^1; sbit P0_2 = P0^2; sbit P0_3 = P0^3; sbit P0_4 = P0^4; sbit P0_5 = P0^5; sbit P0_6 = P0^6; sbit P0_7 = P0^7; /* 使用STC12C5410的4个PCA模块实现三路12位的PWM，32M晶振*/ void pca_timer_isr(void) interrupt 7 using 1 { CF = 0; // P0_1 = ~P0_1; if(CCF0){ CCF0 = 0; P3_7 = 0; P2_4 = 0; P3_5 = 0; CCAP0L = 0xFF; CCAP0H = 0xFF; } if(CCF1){ CCF1 = 0; P3_7 = 1; CCAP1L = Red_L; CCAP1H = Red_H; } if(CCF2){ CCF2 = 0; P2_4 = 1; CCAP2L = Green_L; CCAP2H = Green_H; } if(CCF3){ CCF3 = 0; P3_5 = 1; CCAP3L = Blue_L; CCAP3H = Blue_H; } } void main(void) { WDT_CONTR = 0x3d; //硬件看门狗 P3M0 = 0x00; P3M1 = 0xFF; //设置P3为推挽模式 P2M0 = 0x00; P2M1 = 0xFF; //设置P2为推挽模式 TMOD = 0x22; TH0 = 0xFA; // TH0 = 0x63; // TL0 = 0xC0; ET0 = 1; TR0 = 1; ET1 = 1; TR1 = 1; /* 4个PCA模块工作在16位定时模式 */ AUXR = 0x80; /* 定时器0工作在1T模式 */ CCON = 0; CMOD = 0x02; /* 晶振1/2分频，如果需要100Hz, 则需选用T0溢出率 */ CL = 0; CH = 0; /* CA模块的工作模式设定表如下表所列：的工作模式设定表如下表所列： PCA CCAPMn n = 0,,2,3 模块工作模式设定（设定 （（ 寄存器， ） - ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn 模块功能 0 0 0 0 0 0 0 无此操作 X 1 0 0 0 0 X 16位捕获模式，由CCPn的上升沿触发 X 0 1 0 0 0 X 16位捕获模式，由CCPn的下降沿触发 X 1 1 0 0 0 X 16位捕获模式，由CCPn的跳变触发 1 0 0 1 0 0 X 16位软件定时器 1 0 0 1 1 0 X 16位高速输出 1 0 0 0 0 1 0 8位PWM */ CCAPM0 = 0x49; CCAPM1 = 0x49; CCAPM2 = 0x49; CCAPM3 = 0x49; EPCA_LVD = 1; // PCA模块中断和低压检测中断允许位 CR = 1; EA = 1; IE = 0xC0; Red_L = 0xF0; /* 16位PWM数据低位, 去掉低4位 */ Red_H = 0x7F; Green_L = 0xF0; /* 16位PWM数据低位, 去掉低4位 */ Green_H = 0x7F; Blue_L = 0xF0; /* 16位PWM数据低位, 去掉低4位 */ Blue_H = 0x7F; while(1){ WDT_CONTR = 0x3d; // P0_1 = ~P0_1; //P0_1 = 0; _nop_(); _nop_(); } }