添加项目文件。

stm32_pwm_computer.cpp

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+#define _CRT_SECURE_NO_DEPRECATE
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct
+{
+    int autoreload;
+    int prescaler;
+    float realfreq;
+} timer_config_t;
+
+bool compute_timer_parameter(timer_config_t* config, int timer_in_clk /*mhz*/, int infreq /*hz*/)
+{
+    float psc_x_arr =(float) timer_in_clk * 1000 /*定时器模块时钟*/ * 1000 / infreq;
+    uint32_t psc = 0;
+    uint32_t arr = 65534;
+    for (; arr > 2; arr--)
+    {
+        psc =(uint32_t)( psc_x_arr / arr);
+        if (psc >= 1)
+        {
+            uint32_t tmparr = psc_x_arr / psc;
+            if (tmparr >= 65534)
+                continue;
+            break;
+        }
+    }
+    if (psc == 0)
+        return false;
+    if (arr <= 3)
+        return false; //定时器一周期的分辨率太小了
+    arr = psc_x_arr / psc;
+
+    int psc_x_arr_real = arr * psc;
+    float realfreq = timer_in_clk * 1000.0 /*定时器模块时钟*/ * 1000 / psc_x_arr_real;
+
+    arr = arr - 1;
+    psc = psc - 1;
+
+    config->autoreload = arr;
+    config->prescaler = psc;
+    config->realfreq = realfreq;
+    // config->compare = arr / 2;
+    return false;
+}
+
+void dumpconfig_info(timer_config_t* config)
+{
+    printf("* freq      : %f \n", config->realfreq);
+    printf("* prescaler : %d \n", config->prescaler);
+    printf("* autoreload: %d \n", config->autoreload);
+}
+
+int main(int argc, char const* argv[])
+{
+    if (argc != 3)
+    {
+        printf("%s system_clk mhz expect_freq khz\n", argv[0]);
+        return -1;
+    }
+
+    float expect_freq = 0;
+    float systemclk = 0;
+   
+    sscanf(argv[1], "%f", &systemclk);
+    sscanf(argv[2], "%f", &expect_freq);
+
+    printf("systemclk  : %f mhz\n", systemclk);
+    printf("expect freq: %f khz\n", expect_freq);
+
+    int32_t infreq = (int32_t)(expect_freq * 1000);
+    timer_config_t timerconfig_apb1;
+    timer_config_t timerconfig_apb2;
+
+    //apb1
+    compute_timer_parameter(&timerconfig_apb1, systemclk / 2, infreq);
+    //apb2
+    compute_timer_parameter(&timerconfig_apb2, systemclk, infreq);
+
+    printf("******************************************************\n");
+    printf("* APB1: TIM2 TIM3 TIM4 TIM5 TIM6 TIM7 TIM12 TIM13 TIM14\n");
+    printf("*\n");
+    printf("* timer_module_clk: %f mhz\n", systemclk / 2);
+    printf("* freq            : %f khz\n", timerconfig_apb1.realfreq / 1000.0);
+    printf("* period          : %f ms\n", (1.0 / timerconfig_apb1.realfreq * 1000));
+    printf("* prescaler       : %d \n", timerconfig_apb1.prescaler);
+    printf("* autoreload      : %d \n", timerconfig_apb1.autoreload);
+    printf("*\n");
+    printf("**\n");
+    printf("* APB2: TIM1 TIM8 TIM9 TIM10 TIM11\n");
+    printf("*\n");
+    printf("* timer_module_clk: %f mhz\n", systemclk);
+    printf("* freq            : %f khz\n", timerconfig_apb2.realfreq / 1000.0);
+    printf("* period          : %f ms\n", (1.0 / timerconfig_apb2.realfreq * 1000));
+    printf("* prescaler       : %d \n", timerconfig_apb2.prescaler);
+    printf("* autoreload      : %d \n", timerconfig_apb2.autoreload);
+    printf("***\n");
+    return 0;
+}

stm32_pwm_computer.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.32014.148
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "stm32_pwm_computer", "stm32_pwm_computer.vcxproj", "{855C915D-29AE-4273-80AA-3374E8B9803F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Debug|x64.ActiveCfg = Debug|x64
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Debug|x64.Build.0 = Debug|x64
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Debug|x86.ActiveCfg = Debug|Win32
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Debug|x86.Build.0 = Debug|Win32
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Release|x64.ActiveCfg = Release|x64
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Release|x64.Build.0 = Release|x64
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Release|x86.ActiveCfg = Release|Win32
+		{855C915D-29AE-4273-80AA-3374E8B9803F}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F94697A8-537D-4F75-9A90-2916196874F0}
+	EndGlobalSection
+EndGlobal

stm32_pwm_computer.vcxproj

@@ -0,0 +1,147 @@
+<?xml version="1.0" encoding="utf-8"?>
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+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{855c915d-29ae-4273-80aa-3374e8b9803f}</ProjectGuid>
+    <RootNamespace>stm32pwmcomputer</RootNamespace>
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stm32_pwm_computer.vcxproj.filters

@@ -0,0 +1,22 @@
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