Simplify the use of timers, timer13 sends ultrasonic waves, timer16 counts (debounce time and flight time)

The ultrasonic transducer is driven only after each command is issued.

Src/main.c

@@ -38,10 +38,11 @@ OF SUCH DAMAGE.
 #include "led.h"
 #include "command.h"
 #include <stdio.h>
-#include "i2c.h"
 #include "board_config.h"
 #include "ultrasonic_analog.h"
 
+// #define FLASH_SIZE_ADDR   (*(const uint16_t *)0x1FFFF7E0)
+
 /*!
     \brief      main function
     \param[in]  none
@@ -58,6 +59,7 @@ int main(void)
 
     led_init();
     ultrasonic_config();
+    ultrasonic_pwm_out_cycles();
 
 #ifdef DEBUG_VERBOSE
     char hello_world[] = {"Hello World!\r\n"};
@@ -73,14 +75,7 @@ int main(void)
 
 
     while(1){
-
-        // ultrasonic_pwm_out_cycles();
-        
-        // delay_ms(10);
         command_process();
         delay_ms(10);
-        // uint16_t ultrasonic_value = ultrasonic_calc_distance();
-        // printf("ultrasonic value: %d", ultrasonic_value);
-        // delay_ms(10);
     }
 }