update

linux/.gitignore

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+*.out

linux/README.md

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+
+# README
+
+## 编译  
+
+```bash  
+./build.sh
+```
+
+## 使用  
+
+```bash
+
+# Usage: ././stm32_timer_pwm_computer.out system_clk(mhz) expect_freq(khz)
+
+➜  stm32_timer_pwm_computer ./stm32_timer_pwm_computer.out 168 38   
+systemclk  : 168.000000 mhz
+expect freq: 38.000000 khz
+******************************************************
+* APB1: TIM2 TIM3 TIM4 TIM5 TIM6 TIM7 TIM12 TIM13 TIM14
+*
+* timer_module_clk: 84.000000 mhz
+* freq            : 38.009051 khz
+* period          : 0.026310 ms
+* prescaler       : 0 
+* autoreload      : 2209 
+*
+**
+* APB2: TIM1 TIM8 TIM9 TIM10 TIM11
+*
+* timer_module_clk: 168.000000 mhz
+* freq            : 38.000453 khz
+* period          : 0.026315 ms
+* prescaler       : 0 
+* autoreload      : 4420 
+***
+
+```

linux/build.sh

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+gcc main.c -o stm32_timer_pwm_computer.out

linux/main.c

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+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#if 0
+void trigger_pwm(int32_t freq, float duty, int32_t pluse_num) {
+  //无论怎样先停止PWM输
+  HAL_TIM_PWM_Stop_IT(&htim3, TIM_CHANNEL_1);
+  if (freq == 0) {
+    LOGE("E:trigger pwm fail,freq == 0\n");
+    return;
+  }
+  // 确定预分频参数,重载值
+  float psc_x_arr = 90 * 1000 /*系统时钟*/ * 1000 / freq;
+  uint32_t psc = 0;
+  uint32_t arr = 65534;
+  for (; arr > 2; arr--) {
+    psc = psc_x_arr / arr;
+    if (psc >= 1) {
+      uint32_t tmparr = psc_x_arr / psc;
+      if (tmparr >= 65534) continue;
+      break;
+    }
+  }
+  if (psc == 0) return;
+  if (arr <= 3) return;  //定时器一周期的分辨率太小了
+  arr = psc_x_arr / psc;
+
+  arr = arr - 1;
+  psc = psc - 1;
+
+  __HAL_TIM_SET_AUTORELOAD(&htim3, arr);
+  __HAL_TIM_SET_PRESCALER(&htim3, psc);
+  //  确定PWM通道占空比
+  uint16_t comparevalue = duty * arr;
+  __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, comparevalue);
+  if (pluse_num == 0) {
+    g_continue_output_mode = true;
+  } else {
+    g_pulse_num = pluse_num - 1;
+    g_continue_output_mode = false;
+  }
+  __HAL_TIM_SET_COUNTER(&htim3, 0);
+  LOGD("a[%d] p[%d]c[%d]\r\n", arr, psc, comparevalue);
+  HAL_TIM_PWM_Start_IT(&htim3, TIM_CHANNEL_1);
+}
+#endif
+
+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 = 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 = 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;
+}

windows/README.md

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+
+# README
+
+## TODO  
+
+支持windows图形界面
+
+## 编译  
+
+```bash  
+./build.sh
+```
+
+## 使用  
+
+```bash
+
+# Usage: ././stm32_timer_pwm_computer.out system_clk(mhz) expect_freq(khz)
+
+➜  stm32_timer_pwm_computer ./stm32_timer_pwm_computer.out 168 38   
+systemclk  : 168.000000 mhz
+expect freq: 38.000000 khz
+******************************************************
+* APB1: TIM2 TIM3 TIM4 TIM5 TIM6 TIM7 TIM12 TIM13 TIM14
+*
+* timer_module_clk: 84.000000 mhz
+* freq            : 38.009051 khz
+* period          : 0.026310 ms
+* prescaler       : 0 
+* autoreload      : 2209 
+*
+**
+* APB2: TIM1 TIM8 TIM9 TIM10 TIM11
+*
+* timer_module_clk: 168.000000 mhz
+* freq            : 38.000453 khz
+* period          : 0.026315 ms
+* prescaler       : 0 
+* autoreload      : 4420 
+***
+
+```