250MHz时钟源 PWM, STC32F12K54-64MHz
——高速PWM应用1: 高速PWM输出
——高速PWM应用2：捕获外部高速脉宽（查询方式）
——高速PWM应用3：捕获外部高速脉宽（中断方式）
高速PWM应用1: 高速PWM输出
高速PWM可使用内建500MHz高速HPLL作为时钟源【输出高速PWM】/【捕获外部高速脉宽】
（注：500MHz的HPLL时钟2分频输出50%占空比的PLL输出时钟可作为高速PWM的时钟源）
- /************* 功能说明 **************
- 时钟说明：由内部IRC产生24MHz的时钟分频为6M提供给HPLL当作HPLL输入时钟，PLL锁频到246MHz输出作为高速PWM的时钟源，
- PWM高速输出说明：PWMA的CC1通道配置为输出模式，并从P1.0/P1.1口输出频率为2.46MHz，占空比为50%的互补对称带死区的PWM波形
- 下载时, 选择默认IRC时钟 24MHz。
- ******************************************/
- #include "stc32g.h"
- #define FOSC 24000000UL
- #define HSCK_MCLK 0
- #define HSCK_PLL 1
- #define HSCK_SEL HSCK_PLL
- #define HSIOCK 0x40
- #define ENHPLL 0x80
- #define HPLLDIV_52 0x00
- #define HPLLDIV_54 0x01
- #define HPLLDIV_56 0x02
- #define HPLLDIV_58 0x03
- #define HPLLDIV_60 0x04
- #define HPLLDIV_62 0x05
- #define HPLLDIV_64 0x06
- #define HPLLDIV_66 0x07
- #define HPLLDIV_68 0x08
- #define HPLLDIV_70 0x09
- #define HPLLDIV_72 0x0A
- #define HPLLDIV_74 0x0B
- #define HPLLDIV_76 0x0C
- #define HPLLDIV_78 0x0D
- #define HPLLDIV_80 0x0E
- #define HPLLDIV_82 0x0F
- #define ENCKM 0x80
- #define PCKI_MSK 0x60
- #define PCKI_D1 0x00
- #define PCKI_D2 0x20
- #define PCKI_D4 0x40
- #define PCKI_D8 0x60
- void delay()
- {
- int i;
- for (i=0; i<100; i++);
- }
- char ReadPWMA(char addr)
- {
- char dat;
- while (HSPWMA_ADR & 0x80); //等待前一个异步读写完成
- HSPWMA_ADR = addr | 0x80; //设置间接访问地址,只需要设置原XFR地址的低7位
- //HSPWMA_ADDR寄存器的最高位写1,表示读数据
- while (HSPWMA_ADR & 0x80); //等待当前异步读取完成
- dat = HSPWMA_DAT; //读取异步数据
- return dat;
- }
- void WritePWMA(char addr, char dat)
- {
- while (HSPWMA_ADR & 0x80); //等待前一个异步读写完成
- HSPWMA_DAT = dat; //准备需要写入的数据
- HSPWMA_ADR = addr & 0x7f; //设置间接访问地址,只需要设置原XFR地址的低7位
- //HSPWMA_ADDR寄存器的最高位写0,表示写数据
- }
- int main()
- {
- EAXFR = 1;
- P0M0 = 0; P0M1 = 0;
- P1M0 = 0; P1M1 = 0;
- P2M0 = 0; P2M1 = 0;
- P3M0 = 0; P3M1 = 0;
- P4M0 = 0; P4M1 = 0;
- P5M0 = 0; P5M1 = 0;
- //选择HPLL输入时钟分频,保证输入时钟为6M
- USBCLK &= ~PCKI_MSK;
- #if (FOSC == 6000000UL)
- USBCLK |= PCKI_D1; //PLL输入时钟1分频
- #elif (FOSC == 12000000UL)
- USBCLK |= PCKI_D2; //PLL输入时钟2分频
- #elif (FOSC == 24000000UL)
- USBCLK |= PCKI_D4; //PLL输入时钟4分频
- #elif (FOSC == 48000000UL)
- USBCLK |= PCKI_D8; //PLL输入时钟8分频
- #else
- USBCLK |= PCKI_D4; //默认PLL输入时钟4分频
- #endif
- //设置HPLL的除频系数
- // HPLLCR = HPLLDIV_52; //F_HPLL=6M*52/2=156M
- // HPLLCR = HPLLDIV_54; //F_HPLL=6M*54/2=162M
- // HPLLCR = HPLLDIV_56; //F_HPLL=6M*56/2=168M
- // HPLLCR = HPLLDIV_58; //F_HPLL=6M*58/2=174M
- // HPLLCR = HPLLDIV_60; //F_HPLL=6M*60/2=180M
- // HPLLCR = HPLLDIV_62; //F_HPLL=6M*62/2=186M
- // HPLLCR = HPLLDIV_64; //F_HPLL=6M*64/2=192M
- // HPLLCR = HPLLDIV_66; //F_HPLL=6M*66/2=198M
- // HPLLCR = HPLLDIV_68; //F_HPLL=6M*68/2=204M
- // HPLLCR = HPLLDIV_70; //F_HPLL=6M*70/2=210M
- // HPLLCR = HPLLDIV_72; //F_HPLL=6M*72/2=216M
- // HPLLCR = HPLLDIV_74; //F_HPLL=6M*74/2=222M
- // HPLLCR = HPLLDIV_76; //F_HPLL=6M*76/2=228M
- // HPLLCR = HPLLDIV_78; //F_HPLL=6M*78/2=234M
- // HPLLCR = HPLLDIV_80; //F_HPLL=6M*80/2=240M
- HPLLCR = HPLLDIV_82; //F_HPLL=6M*82/2=246M
- //启动HPLL
- HPLLCR |= ENHPLL; //使能HPLL
- delay(); //等待HPLL时钟稳定
- //选择HSPWM/HSSPI时钟
- #if (HSCK_SEL == HSCK_MCLK)
- CLKSEL &= ~HSIOCK; //HSPWM/HSSPI选择主时钟为时钟源
- #elif (HSCK_SEL == HSCK_PLL)
- CLKSEL |= HSIOCK; //HSPWM/HSSPI选择PLL输出时钟为时钟源
- #else
- CLKSEL &= ~HSIOCK; //默认HSPWM/HSSPI选择主时钟为时钟源
- #endif
- HSCLKDIV = 0; //HSPWM/HSSPI时钟源不分频
- HSPWMA_CFG = 0x03; //使能PWMA相关寄存器异步访问功能
- PWMA_PS = 0x00; //PWMA_CC1/CC1N高速PWM输出到CC1/CC1N口
- //注意:PWMA_PS属于I/O控制寄存器,不能使用异步方式进行读写
- //通过异步方式设置PWMA的相关寄存器
- WritePWMA((char)&PWMA_CCER1, 0x00);
- WritePWMA((char)&PWMA_CCMR1, 0x00); //CC1为输出模式
- WritePWMA((char)&PWMA_CCMR1, 0x60); //OC1REF输出PWM1(CNT<CCR时输出有效电平1)
- WritePWMA((char)&PWMA_CCER1, 0x05); //使能CC1/CC1N上的输出功能
- WritePWMA((char)&PWMA_ENO, 0x03); //使能PWM信号输出到端口P1.0/P1.1
- WritePWMA((char)&PWMA_BKR, 0x80); //使能主输出
- WritePWMA((char)&PWMA_CCR1H, 0); //设置PWM占空比为50个PWM时钟
- WritePWMA((char)&PWMA_CCR1L, 50);
- WritePWMA((char)&PWMA_ARRH, 0); //设置输出PWM的周期为100个PWM时钟
- WritePWMA((char)&PWMA_ARRL, 99);
- WritePWMA((char)&PWMA_DTR, 10); //设置互补对称输出PWM的死区
- WritePWMA((char)&PWMA_CR1, 0x01); //开始PWM计数
- // P2 = ReadPWMA((char)&PWMA_ARRH); //异步方式读取寄存器
- // P0 = ReadPWMA((char)&PWMA_ARRL);
- while (1);
- }
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