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#include "SWM221.h"
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/* 使用非对称中心对齐模式，保持输出波形占空比不变，实现移相功能 */
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int main(void)
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{
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PWM_InitStructure PWM_initStruct;
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SystemInit();
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PORT_Init(PORTA, PIN3, PORTA_PIN3_PWM0A, 0);
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PORT_Init(PORTA, PIN2, PORTA_PIN2_PWM0AN, 0);
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PORT_Init(PORTA, PIN6, PORTA_PIN6_PWM0B, 0);
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PORT_Init(PORTA, PIN7, PORTA_PIN7_PWM0BN, 0);
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PORT_Init(PORTA, PIN5, PORTA_PIN5_PWM1A, 0);
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PORT_Init(PORTA, PIN4, PORTA_PIN4_PWM1AN, 0);
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PORT_Init(PORTA, PIN1, PORTA_PIN1_PWM1B, 0);
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PORT_Init(PORTA, PIN0, PORTA_PIN0_PWM1BN, 0);
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PWM_initStruct.Mode = PWM_ASYM_CENTER_ALIGNED;
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PWM_initStruct.Clkdiv = 6; //F_PWM = 60M/6 = 10M
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PWM_initStruct.Period = 10000; //10M/(10000 + 10000) = 500Hz
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PWM_initStruct.HdutyA = 2500; //(2500+2500)/(10000+10000) = 25%
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PWM_initStruct.HdutyA2 = 2500;
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PWM_initStruct.DeadzoneA = 50;
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PWM_initStruct.IdleLevelA = 0;
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PWM_initStruct.IdleLevelAN= 0;
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PWM_initStruct.OutputInvA = 0;
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PWM_initStruct.OutputInvAN= 0;
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PWM_initStruct.HdutyB = 7500; //(7500+7500)/(10000+10000) = 75%
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PWM_initStruct.HdutyB2 = 7500;
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PWM_initStruct.DeadzoneB = 5;
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PWM_initStruct.IdleLevelB = 0;
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PWM_initStruct.IdleLevelBN= 0;
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PWM_initStruct.OutputInvB = 0;
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PWM_initStruct.OutputInvBN= 0;
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PWM_initStruct.UpOvfIE = 0;
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PWM_initStruct.DownOvfIE = 0;
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PWM_initStruct.UpCmpAIE = 0;
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PWM_initStruct.DownCmpAIE = 0;
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PWM_initStruct.UpCmpBIE = 0;
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PWM_initStruct.DownCmpBIE = 0;
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PWM_Init(PWM0, &PWM_initStruct);
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PWM_Init(PWM1, &PWM_initStruct);
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PWM_IntEn(PWM1, PWM_IT_OVF_UP);
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NVIC_EnableIRQ(PWM1_IRQn);
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PWM_Start(PWM0_MSK | PWM1_MSK);
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while(1==1)
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{
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}
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}
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void PWM1_Handler(void)
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{
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static int dir = 0;
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static int n = 0;
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if(PWM_IntStat(PWM1, PWM_IT_OVF_UP))
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{
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PWM_IntClr(PWM1, PWM_IT_OVF_UP);
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if(++n == 2)
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n = 0;
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else
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return;
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PWMG->RELOADEN = 0x00; // 关闭工作寄存器加载更新，保证所有寄存器都更新完后再更新输出波形
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if(dir == 0)
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{
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if(PWM1->CMPA2 == 0)
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{
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PWM1->CMPA = 2500;
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PWM1->CMPA2 = 2500;
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PWM1->CMPB = 7500;
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PWM1->CMPB2 = 7500;
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dir = 1;
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}
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else
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{
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PWM1->CMPA += 250; // 前半周期的高电平时长增加
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PWM1->CMPA2 -= 250; // 后半周期的高电平时长减小，高电平向右移相
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PWM1->CMPB += 750; // 注意：这里说的前半周期、后半周期是针对 PWM 计数器的计数方向说的，向上计数称作前半周期，向下计数称作后半周期
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PWM1->CMPB2 -= 750; // 从PWM输出的波形上看，前半周期反而对应 PWM 高电平的右侧部分，后半周期反而对应 PWM 高电平的左侧部分
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}
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}
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else
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{
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if(PWM1->CMPA == 0)
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{
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PWM1->CMPA = 2500;
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PWM1->CMPA2 = 2500;
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PWM1->CMPB = 7500;
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PWM1->CMPB2 = 7500;
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dir = 0;
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}
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else
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{
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PWM1->CMPA -= 250; // 前半周期的高电平时长减小
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PWM1->CMPA2 += 250; // 后半周期的高电平时长增加，高电平向左移相
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PWM1->CMPB -= 750;
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PWM1->CMPB2 += 750;
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}
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}
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PWMG->RELOADEN = 0x3F;
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}
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}
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