WorkFiles/XC_SDK/XC6xx_ble_sdk/Bsp/bsp_pwm.c

#include 	"Platform.h"

/* ---------------------------------------------------------------------------------------------------
- 函数名称: xc_pwm_init
- 函数功能: pwm初始化
- 输入参数: pwm口（0或1）,占空比设置（范围0--99），周期计数器设置影响pwm信号输出频率(输出频率=pwm_clk/((period + 1)*100))
- 创建日期: 2019-04-22
- 作    者：陈俊伟
----------------------------------------------------------------------------------------------------*/
void xc_set_pwm(uint8_t ch,uint8_t ocpy_ratio, uint16_t period)
{
	__write_hw_reg32(PWMx_EN(ch),0x0);//暂停相应的 PWM 周期计数器和占空比计数器 
	__write_hw_reg32(PWMx_P(ch),period);//pwm周期设置寄存器--等于pwm_clk/((period + 1)*100)
	__write_hw_reg32(PWMx_OCPY(ch),ocpy_ratio);//pwm占空比设置寄存器
	__write_hw_reg32(PWMx_UP(ch),0x1);//更新周期寄存器和占空比寄存器。
	__write_hw_reg32(PWMx_EN(ch),0x1);//使能相应的 PWM 周期计数器和占空比计数器
}

/*
PWM 输出频率计算公式为
Fout= 160K/((div+1)*(period + 1))
Fout   : 输出频率
div    : PWM 时钟分频比(范围0-255)
period : PWM 周期设置  (范围0-255)
*/
void xc_pwm_init(uint8_t ch,uint8_t ocpy_ratio, uint16_t period)
{
	
	//注：管脚配置在Init_gpio函数中进行
	
	__write_hw_reg32(CPR_CTLAPBCLKEN_GRCTL,0x10001000); //PWM_PCLK 时钟使能
	__write_hw_reg32(CPR_PWM_CLK_CTL,0x80000000); //pwm_clk=mclk_in(32M)/(2*(0 +1))= 16M ; max output HZ 160KHZ
//	__write_hw_reg32(CPR_PWM_CLK_CTL,0x80000009); //pwm_clk=mclk_in(32M)/(2*(9+1))=1.6M 
     /*
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x80000000); //pwm_clk=mclk_in(32M)/(2*(0 +1))= 16M ; max output HZ 160KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x80000001); //pwm_clk=mclk_in(32M)/(2*(1 +1))=  8M ; max output HZ  80KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x80000003); //pwm_clk=mclk_in(32M)/(2*(3 +1))=  4M ; max output HZ  40KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x80000007); //pwm_clk=mclk_in(32M)/(2*(7 +1))=  2M ; max output HZ  20KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x80000009); //pwm_clk=mclk_in(32M)/(2*(9 +1))=1.6M ; max output HZ  16KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x8000000F); //pwm_clk=mclk_in(32M)/(2*(15+1))=  1M ; max output HZ  10KHZ
    __write_hw_reg32(CPR_PWM_CLK_CTL,0x8000004F); //pwm_clk=mclk_in(32M)/(2*(79+1))=0.2M ; max output HZ   2KHZ
    */
	xc_set_pwm(ch,ocpy_ratio,period);
	
	
}