老Xuan贡献：STM8L TIM2 PWM 生成demo程序

只看该作者 · 2012-8-25 17:46

本帖最后由 solarmax1969 于 2012-8-25 17:48 编辑

老Xuan是初学者，边学习边贡献，哈哈，贡献也是一种幸福啊！
研究了二天，PWM波形基本搞出来了，具体实用程序请看下面。

/* TIM2 ,通道1，用于生成 38Khz 红外载波信号 */
void TIM2_Init(void)
{
CLK_PCKENR1 |= (1<<CLK_TIM2);

TIM2_CR1 = 0x00; //计数禁用
TIM2_PSCR  = 0x00; //预分频系数=1

TIM2_ARRH  = 0x00;
TIM2_ARRL  = 53; //设置输出频率 38khz

TIM2_CCR1H = 0x00;
// TIM2_CCR1L =  10; //设置Duty
TIM2_CCR1L =  30; //设置Duty 大约48%

TIM2_CCER1 |= ((1<<CC1P) | (1<<CC1E)); //低电平有效，同时启用输出
TIM2_CCMR1 = 0x70; //PWM输出模式
TIM2_IER |= (1<<CC1IE); //启用中断
TIM2_CR1 |= (1<<CEN); //计数器使能，开始工作

TIM2_BKR  |=(1<<MOE); //主输出使能
}

//下面的中断也可以不用它
@far @interrupt void TIM2_OC1(void) //TIM2，通道1，比较匹配中断
{
CLI();
TIM2_SR1  &= (~(1<<CC1IF)); //清楚标志位
// 可在这里加入对Duty修改的语句
SEI();
}

---------------------------------- 下面是自己搞的寄存器头文件
/***********************************************************
**文件名：SM_STM8L151_REGS.h
**创建时间：2012/08/10
**作者：JIM XUAN
************************************************************
**功能：处理单片机核心资源的定义,Bit标识符
**备注：
**修改:
***********************************************************/
#ifndef __SM_STM8L151_REGS_H
#define __SM_STM8L151_REGS_H

#define SEI() _asm("rim") // 允许CPU 全局中断
#define CLI() _asm("sim") // 禁止CPU 全局中断
#define NOP() _asm("NOP")

/*  Peripheral clock gating register 1 (CLK_PCKENR1) */
#define CLK_DAC 7
#define CLK_BEEP 6
#define CLK_USART1 5
#define CLK_SPI1 4
#define CLK_I2C1 3
#define CLK_TIM4 2
#define CLK_TIM3 1
#define CLK_TIM2 0
/*  Peripheral clock gating register 2 (CLK_PCKENR2) */
#define CLK_BOOTROOM 7 //
#define CLK_COMP12 5
#define CLK_DMA1 4
#define CLK_LCD 3
#define CLK_RTC 2
#define CLK_TIM1 1
#define CLK_ADC1 0
/*  ADC1  ADC1_CR1 */
#define OVERIE 7
#define RES1 6
#define RES0 5
#define AWDIE  4
#define EOCIE  3
#define CONT 2
#define START  1
#define ADON 0
/* ADC1_CR2 */
#define PRESC 7
#define TRIG_EDGE1 6
#define TRIG_EDGE0 5
#define EXTSEL1 4
#define EXTSEL0 3
#define SMTP12    2
#define SMTP11    1
#define SMTP10    0
/* ADC1_CR3 */
#define SMTP22    7
#define SMTP21    6
#define SMTP20    5
#define CHSEL4    4
#define CHSEL3    3
#define CHSEL2    2
#define CHSEL1    1
#define CHSEL0    0
#define ADC1_VREFINT 0b00011100
#define ADC1_TS    0b00011101
/* ADC1_SR */
#define OVER 2 //overrun flag
#define AWD  1 //Analog watchdog flag,电压过高or过低。可定义高低阀值。
#define EOC  0 //End of conversion

/* TIM23_CR1 */
#define ARPE 7
#define CMS1 6
#define CMS0 5
#define DIR  4
#define OPM  3
#define URS  2
#define UDIS 1
#define CEN  0
/* TIM23_CR2 */
#define TI1S 7
#define MMS2 6
#define MMS1 5
#define MMS0 4
#define CCDS 3
/* TIM23_SMCR */
#define MSM  7
#define TS2  6
#define TS1  5
#define TS0  4
#define SMS2 2
#define SMS1 1
#define SMS0 0
/* TIM23_ETR*/
#define ETP 7
#define ECE 6
#define ETPS1 5
#define ETPS0 4
#define ETF3  3
#define ETF2  2
#define ETF1  1
#define ETF0  0
/* DMA request enable register (TIMx_DER) */
#define CC2DE 2
#define CC1DE 1
#define UDE 0
/* Interrupt enable register (TIMx_IER) */
#define BIE 7
#define TIE 6
#define CC2IE 2
#define CC1IE 1
#define UIE 0
/* Status register 1 (TIMx_SR1) */
#define BIF 7
#define TIF 6
#define CC2IF 2
#define CC1IF 1
#define UIF 0
/* Status register 2 (TIMx_SR2) */
#define CC2OF 2
#define CC1OF 1
/* Event generation register (TIMx_EGR) */
#define BG 7
#define TG 6
#define CC2G 2
#define CC1G 1
#define UG 0
/* Capture/compare mode register 1 (TIMx_CCMR1) */
#define OC1M2 6
#define OC1M1 5
#define OC1M0 4
#define OC1PE 3
#define OC1FE 2
#define CC1S1 1
#define CC1S0 0
#define IC1F3 7
#define IC1F2 6
#define IC1F1 5
#define IC1F0 4
#define IC1PSC1 3
#define IC1PSC0 2
#define CC1S1  1
#define CC1S0  0
/* Capture/compare mode register 2 (TIMx_CCMR2) */
#define OC2M2 6
#define OC2M1 5
#define OC2M0 4
#define OC2PE 3
#define OC2FE 2
#define CC2S1 1
#define CC2S0 0
#define IC2F3 7
#define IC2F2 6
#define IC2F1 5
#define IC2F0 4
#define IC2PSC1 3
#define IC2PSC0 2
#define CC2S1  1
#define CC2S0  0
/* Capture/compare enable register 1 (TIMx_CCER1) */
#define CC2P 5
#define CC2E 4
#define CC1P 1
#define CC1E 0
/* Counter high (TIMx_CNTRH) */
/* Counter low (TIMx_CNTRL)  */
/* Prescaler register (TIMx_PSCR) */
#define PSC2 2
#define PSC1 1
#define PSC0 0
/* Auto-reload register high (TIMx_ARRH) */
/* Auto-reload register high (TIMx_ARRL) */
/* Capture/compare register 1 high (TIMx_CCR1H) */
/* Capture/compare register 1 high (TIMx_CCR1L) */
/* Capture/compare register 1 high (TIMx_CCR2H) */
/* Capture/compare register 1 high (TIMx_CCR2L) */
/* Break register (TIMx_BKR) */
#define MOE 7
#define AOE 6
#define BKP 5
#define BKE 4
#define OSSI 2
#define LOCK1 1
#define LOCK0 0
/* Output idle state register (TIMx_OISR) */
#define OIS2 2
#define OIS1 0

#endif

***************8
上面程序已经调试成功能用的。
现在还有几个关键的问题：
1：Fpwm 频率到底如果计算的？
2：PWM位数是几位？