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109 lines
3.7 KiB
109 lines
3.7 KiB
#include "pwm.h"
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#define CLCK 48
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void t16_pa4_init(void) {
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// PA4 T16N0_1
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T16Nx_BaseInitStruType x;
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T16Nx_PWMInitStruType y;
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/* 初始化T16Nx定时器*/
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x.T16Nx_ClkS = T16Nx_ClkS_PCLK; //时钟源48M
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x.T16Nx_SYNC = Disable; //不同步
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x.T16Nx_EDGE = T16Nx_EDGE_Rise; //上升沿触发
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x.T16Nx_Mode = T16Nx_Mode_PWM; // 选用PWM模式
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x.T16Nx_PREMAT = 0x01; /* 预分频比1:1 */
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T16Nx_BaseInit(T16N0, &x);
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/* 配置T16N0通道1输出 */
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y.T16Nx_MOE0 = Disable;
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y.T16Nx_MOE1 = Enable;
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y.T16Nx_POL0 =
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POSITIVE; //在串口发送的时候，正极性代表发送的数据与接受的数据相同，负极性代表与发送的数据相反，在这么不知道有没有作用
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y.T16Nx_POL1 = POSITIVE;
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y.T16Nx_PWMMODE = T16Nx_PWMMode_INDEP; //选择独立模式
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y.PWMDZE = Disable; // PWM互补模式死区使能
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y.REGBUFEN = Enable; //缓冲寄存器使能 (REGBUFEN目前不知道干什么用的)
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T16Nx_PMWOutInit(T16N0, &y);
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/* 配置T16N0 通道1输出 */
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/*MAT2 MAT3 通道的中断配置*/
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//匹配寄存器值匹配后的工作模式，计数到以后： 继续计数不产生中断
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T16Nx_MAT2ITConfig(T16N0, T16Nx_Go_No);
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//匹配寄存器值匹配后的工作模式,清零并重新计数，产生中断
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T16Nx_MAT3ITConfig(T16N0, T16Nx_Clr_Int);
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/*MAT2 MAT3 匹配后的输出电平高低*/
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T16Nx_MAT2Out1Config(T16N0,
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T16Nx_Out_Low); //匹配后输出端口的模式，输出高还是低
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T16Nx_MAT3Out1Config(T16N0,
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T16Nx_Out_High); //匹配后输出端口的模式，输出高还是低
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//以上是设置模式，输出高低电平
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T16Nx_SetCNT1(T16N0, 0); //设定计数器的初始值
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T16Nx_SetMAT2(T16N0, 0); //设置匹配寄存器的数值
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T16Nx_SetMAT3(T16N0, 0); //设置匹配寄存器的数值
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//设置计数器峰值//根据这个得到定时的时钟48M/48000=1khZ(在独立模式下PWM的周期由TOP1决定为TOP+1，周期算出来是1ms)
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T16Nx_SetTOP1(T16N0, 0);
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//以上是设置占空比
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/* 配置输出管脚 */
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GPIO_InitSettingType initset;
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initset.Signal = GPIO_Pin_Signal_Digital; //数字
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initset.Dir = GPIO_Direction_Output; //输出模式
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initset.Func = GPIO_Reuse_Func2; //复用到T16N0_1功能
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initset.ODE = GPIO_ODE_Output_Disable; //开漏使能
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initset.DS = GPIO_DS_Output_Normal; //普通电流模式
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initset.PUE = GPIO_PUE_Input_Enable; //弱上拉使能
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initset.PDE = GPIO_PDE_Input_Disable; //弱下拉禁止
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/* 配置PA4为T16N0输出通道1 */
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GPIO_Init(GPIO_Pin_A4, &initset);
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T16Nx_Enable(T16N0);
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return;
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}
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//######################################################
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static double calculate_top(double target_frequency) {
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int clck = 0;
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int target_frequency_hz = 0;
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int top = 0;
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clck = CLCK * 1000 * 1000;
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target_frequency_hz = (int)target_frequency * 1000;
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// printf("target_frequency_hz%d\n", target_frequency_hz);
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top = clck / target_frequency_hz;
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// printf("top%d\t\n", top);
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return top;
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}
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static double calculate_MAT2(double top, double duty) {
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double percentage_duty = 0;
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double Mat2 = 0;
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percentage_duty = duty / 100;
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Mat2 = top * percentage_duty;
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return Mat2;
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}
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/**
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* @brief 设置pwm的周期占空比
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*
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* @param frequency
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* @param duty
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*/
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void set_pwm_modbul_freq_duty(uint32_t frequency, uint32_t duty) {
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double top = 0;
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double Mat2 = 0;
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if (frequency > CLCK * 1000) {
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printf("out of range\n");
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return;
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}
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top = calculate_top(frequency); //根据需要的频率计算出TOP（自动重装载值）
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if (top == 0) {
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return;
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}
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Mat2 = calculate_MAT2(top, duty);
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printf("top:\t%2.lf\n", top);
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printf("MAT2:\t%2.lf\n", Mat2);
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printf("MAT3:\t%2.lf\n", top);
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T16Nx_Disable(T16N0);
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t16_pa4_init();
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T16Nx_SetMAT2(T16N0, Mat2);
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if (duty == 100) {
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T16Nx_SetMAT3(T16N0, top - 1);
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} else {
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T16Nx_SetMAT3(T16N0, top);
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}
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T16Nx_SetTOP1(T16N0, top);
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}
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//######################################################
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