Rewrite the M1 command to send the drive signal after receiving the M1 command, and turn on TIMER16 at the same time. Set the measurement completion flag after 240us, and turn off TIMER16 after the maximum TOF timing.

Inc/board_config.h

@@ -36,15 +36,15 @@
 
 /******************************************************************************/
 
-#define RS485_RCU            RCU_USART0
+#define RS485_RCU            RCU_USART1
 #define RS485_GPIO_RCU       RCU_GPIOA
 #define RS485_GPIO_PORT      GPIOA
 #define RS485_TX_PIN         GPIO_PIN_2
 #define RS485_RX_PIN         GPIO_PIN_3
-#define RS485_PHY            USART0
+#define RS485_PHY            USART1
 #define RS485_BAUDRATE       115200U
 #define RS485_EN_PIN         GPIO_PIN_1
-#define RS485_IRQ            USART0_IRQn
+#define RS485_IRQ            USART1_IRQn
 
 /******************************************************************************/
 
@@ -58,11 +58,6 @@
 
 /******************************************************************************/
 
-#define US_TX_DELAY_RCU     RCU_TIMER15
-#define US_TX_DELAY_TIMER   TIMER15
-
-/******************************************************************************/
-
 #define US_RX_GPIO_RCU      RCU_GPIOB
 #define US_RX_EXTI_RCU      RCU_CFGCMP
 #define US_RX_GPIO_PORT     GPIOA
@@ -76,6 +71,7 @@
 #define US_ECHO_RCU         RCU_TIMER16
 #define US_ECHO_TIMER       TIMER16
 #define US_ECHO_CH          TIMER_CH_0
+#define US_ECHO_TIMER_IRQ   TIMER16_IRQn
 
 /******************************************************************************/
 

LD/gd32e23x_flash.ld

@@ -12,8 +12,8 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Memories definition */
 MEMORY
 {
-    FLASH (rx)  : ORIGIN = 0x08000000, LENGTH = 16K
+    FLASH (rx)  : ORIGIN = 0x08000000, LENGTH = 64K
-    RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 4K
+    RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 8K
 }
 
 /* Sections */

Src/command.c

@@ -18,6 +18,7 @@
 #include "board_config.h"
 #include "gd32e23x_usart.h"
 #include "ultrasonic_analog.h"
+#include "systick.h"
 
 /* ============================================================================
  * 协议格式说明
@@ -254,19 +255,37 @@ void handle_command(const uint8_t *frame, uint8_t len) {
         // 仅基础命令，如 M1, M2, M3
         switch (base_cmd) {
             case 1u: // M1: enable sensor report
-                // g_ultrasonic_measure_done = false;
-                ultrasonic_pwm_out_cycles();
                 gpio_bit_toggle(GPIOA, GPIO_PIN_0);
                 
-                while (g_ultrasonic_measure_done)
+                // 启动超声波PWM发送
-                {
+                ultrasonic_pwm_out_cycles();
-                    g_ultrasonic_measure_done = false;
+                
-                    send_response(RESP_TYPE_OK, s_report_status_err, sizeof(s_report_status_err));
+                // 启动TIMER16用于240us精确计时
-                    return;
+                timer_counter_value_config(TIMER16, 0);  // 复位计数器
+                timer_enable(TIMER16);  // 启动定时器
+
+                // 等待超声测量完成，最多等待1ms (100次 * 10us)
+                // TIMER16将在240us时设置g_ultrasonic_measure_done = true
+                uint16_t timeout_count = 0;
+                const uint16_t max_timeout = 150;
+                
+                while (!g_ultrasonic_measure_done && timeout_count < max_timeout) {
+                    delay_10us(1);  // 延时 10us
+                    timeout_count++;
                 }
 
+                gpio_bit_toggle(GPIOA, GPIO_PIN_0);
 
-                
+                // 根据等待结果发送不同的响应
+                if (g_ultrasonic_measure_done) {
+                    // 测量完成，发送正常响应
+                    send_response(RESP_TYPE_OK, s_report_status_ok, sizeof(s_report_status_ok));
+                } else {
+                    // 超时，发送读取错误包（理论上不应该发生，因为TIMER16会在240us时触发）
+                    static const uint8_t timeout_error_data[] = { 0xFF, 0xFF, 0xFF, 0xFF };
+                    send_response(RESP_TYPE_OK, timeout_error_data, sizeof(timeout_error_data));
+                }
+                return;
 
             case 2u: // M2: disable sensor report
                 send_response(RESP_TYPE_OK, s_report_status_ok, sizeof(s_report_status_ok));

Src/gd32e23x_it.c

@@ -39,8 +39,6 @@ OF SUCH DAMAGE.
 #include "led.h"
 #include "ultrasonic_analog.h"
 
-extern uint16_t g_capture_value;
-
 /*!
     \brief      this function handles NMI exception
     \param[in]  none
@@ -104,39 +102,30 @@ void SysTick_Handler(void) {
     delay_decrement();
 }
 
-// /**
+void TIMER16_IRQHandler(void) {
-//   * @brief  This function handles TIMER15 interrupt request.
+    // 处理通道0比较中断（240us时触发）
-//   * @param[in]  none
+    if (timer_interrupt_flag_get(TIMER16, TIMER_INT_FLAG_CH0)) {
-//   * @param[out] none
+        timer_interrupt_flag_clear(TIMER16, TIMER_INT_FLAG_CH0);
-//   * @retval None
-//   */
-// void TIMER15_IRQHandler(void) {
-//     if (timer_interrupt_flag_get(US_TX_DELAY_TIMER, TIMER_INT_FLAG_UP) == SET)
-//     {
-//         timer_interrupt_flag_clear(US_TX_DELAY_TIMER, TIMER_INT_FLAG_UP);
-//         exti_interrupt_enable(US_RX_GPIO_EXTI); // turn on hardware external input interrupt
-//         timer_counter_value_config(US_ECHO_TIMER, 0);
-//         timer_enable(US_ECHO_TIMER);   // turn on timer to calculate the first ultrasonic echo time
-//         timer_disable(US_TX_DELAY_TIMER);
-//     }
-// }
         
-void TIMER15_IRQHandler(void) {
+        // 在240us时执行的操作
-    if (timer_interrupt_flag_get(TIMER15, TIMER_INT_FLAG_CH1)) {
+        g_ultrasonic_measure_done = true; // 设置测量完成标志
-        timer_interrupt_flag_clear(TIMER15, TIMER_INT_FLAG_CH1);
+        
-        // g_ultrasonic_measure_done = true; // TODO 测距命令发送回报标识位，最终不应在这里
+        // TODO: 在这里可以执行其他240us时需要的操作
-        gpio_bit_set(GPIOA, GPIO_PIN_0); // TODO waiting for delete
+        // 例如：启动其他定时器、设置GPIO、记录时间戳等
     }
 
-    if (timer_interrupt_flag_get(TIMER15, TIMER_INT_FLAG_UP)) {
+    // 处理重装载中断（1000us时触发，即超时）
-        timer_interrupt_flag_clear(TIMER15, TIMER_INT_FLAG_UP);
+    if (timer_interrupt_flag_get(TIMER16, TIMER_INT_FLAG_UP)) {
-        timer_disable(TIMER15);
+        timer_interrupt_flag_clear(TIMER16, TIMER_INT_FLAG_UP);
+        
+        // 达到最大时间（1ms），自动关闭定时器
+        timer_disable(TIMER16);
+        
+        // TODO: 超时处理逻辑
+        // 如果需要，可以在这里设置超时标志或执行其他清理操作
     }
-    
 }
 
-
-
 /**
   * @brief  This function handles external lines 0 to 1 interrupt request
   * @param[in]  none
@@ -147,7 +136,7 @@ void EXTI0_1_IRQHandler(void) {
     if (exti_interrupt_flag_get(US_RX_GPIO_EXTI) == SET)
     {
         exti_interrupt_flag_clear(US_RX_GPIO_EXTI);
-        g_capture_value = timer_channel_capture_value_register_read(US_ECHO_TIMER, US_ECHO_CH);
+        // g_capture_value = timer_channel_capture_value_register_read(US_ECHO_TIMER, US_ECHO_CH);
         
         timer_disable(US_ECHO_TIMER);
         exti_interrupt_disable(US_RX_GPIO_EXTI);
@@ -167,7 +156,7 @@ void TIMER13_IRQHandler(void)
         if(pwm_cycle_count >= (ULTRASONIC_TX_CYCLES)) {
             timer_disable(TIMER13);
             pwm_cycle_count = 0;
-            g_ultrasonic_measure_done = true; // TODO 测距命令发送回报标识位，最终不应在这里
+            // g_ultrasonic_measure_done = true; // 注释掉，现在由TIMER16在240us时设置
         }
         
     }

Src/main.c

@@ -42,8 +42,6 @@ OF SUCH DAMAGE.
 #include "board_config.h"
 #include "ultrasonic_analog.h"
 
-volatile uint16_t g_capture_value;
-
 /*!
     \brief      main function
     \param[in]  none

Src/ultrasonic_analog.c

@@ -6,7 +6,6 @@
 #include "systick.h"
 
 volatile bool g_ultrasonic_measure_done = false;
-extern uint32_t g_capture_value;
 
 void ultrasonic_tx_init(void) {
 
@@ -73,29 +72,12 @@ void ultrasonic_pwm_out_cycles(void) {
     timer_channel_output_state_config(TIMER13, TIMER_CH_0, TIMER_CCX_ENABLE);
 
     timer_enable(US_TX_TIMER);
-    timer_enable(TIMER15);
+
+    // TODO 启动后续回波计时器
+    // timer_enable(US_ECHO_TIMER);
 
 }
 
-// void ultrasonic_transmit_debounce_delay(const uint16_t micro_second) {
-//     rcu_periph_clock_enable(US_TX_DELAY_RCU);
-//     timer_deinit(US_TX_DELAY_TIMER);
-
-//     timer_parameter_struct timer_initpara;
-//     timer_struct_para_init(&timer_initpara);
-//     timer_initpara.prescaler = 71;
-//     timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
-//     timer_initpara.counterdirection = TIMER_COUNTER_UP;
-//     timer_initpara.period = micro_second - 1;
-//     timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
-//     timer_initpara.repetitioncounter = 0;
-//     timer_init(US_TX_DELAY_TIMER, &timer_initpara);
-
-//     timer_auto_reload_shadow_enable(US_TX_DELAY_TIMER);
-//     timer_interrupt_enable(US_TX_DELAY_TIMER, TIMER_INT_UP);
-//     nvic_irq_enable(TIMER15_IRQn, 1U);
-// }
-
 void ultrasonic_receive_exti_config(void) {
     rcu_periph_clock_enable(US_RX_GPIO_RCU);
     rcu_periph_clock_enable(US_RX_EXTI_RCU);
@@ -111,47 +93,51 @@ void ultrasonic_receive_exti_config(void) {
 }
 
 void ultrasonic_echo_timer_config(void) {
+    // 使能TIMER16时钟
     rcu_periph_clock_enable(US_ECHO_RCU);
+    
+    // 复位定时器到默认状态
     timer_deinit(US_ECHO_TIMER);
 
+    // 配置基本定时器参数
     timer_parameter_struct timer_initpara;
     timer_struct_para_init(&timer_initpara);
-    timer_initpara.prescaler = 71;
+    
+    // 设置分频器：72MHz ÷ 72 = 1MHz，每个计数 = 1us
+    timer_initpara.prescaler = 71;  // (72-1)，实际分频比为72
     timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
     timer_initpara.counterdirection = TIMER_COUNTER_UP;
-    timer_initpara.period = ULTRASONIC_MAX_TOF_RELOAD - 1;
-    timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
-    timer_init(TIMER15, &timer_initpara);
     
+    // 设置周期：999 (0-999共1000个计数) = 1000us = 1ms最大计时
+    timer_initpara.period = 999;  // 1000us重装载周期
+    timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
+    
+    // 初始化定时器基本参数
+    timer_init(US_ECHO_TIMER, &timer_initpara);
+
+    // 配置通道0用于240us比较中断（不是PWM输出，仅用于比较）
     timer_oc_parameter_struct timer_oc_initpara;
     timer_channel_output_struct_para_init(&timer_oc_initpara);
-    timer_oc_initpara.outputstate = TIMER_CCX_ENABLE;
+    
+    // 禁用输出，仅用于内部比较中断
+    timer_oc_initpara.outputstate = TIMER_CCX_DISABLE;
     timer_oc_initpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
-    timer_channel_output_config(TIMER15, TIMER_CH_1,&timer_oc_initpara);
+    timer_channel_output_config(US_ECHO_TIMER, US_ECHO_CH, &timer_oc_initpara);
 
-    timer_interrupt_enable(TIMER15, TIMER_INT_CH1 | TIMER_INT_UP);
+    // 设置比较模式为时间比较（不是PWM模式）
-    nvic_irq_enable(TIMER15_IRQn, 0);
+    timer_channel_output_mode_config(US_ECHO_TIMER, US_ECHO_CH, TIMER_OC_MODE_TIMING);
     
+    // 设置240us时触发比较中断（计数值239，因为从0开始计数）
+    timer_channel_output_pulse_value_config(US_ECHO_TIMER, US_ECHO_CH, 239);
 
-    // timer_parameter_struct timer_initpara;
+    // 启用比较中断（CH0）和重装载中断（UP）
-    // timer_struct_para_init(&timer_initpara);
+    timer_interrupt_enable(US_ECHO_TIMER, TIMER_INT_CH0);  // 240us比较中断
-    // timer_initpara.prescaler = 71;
+    timer_interrupt_enable(US_ECHO_TIMER, TIMER_INT_UP);   // 1000us重装载中断
-    // timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
-    // timer_initpara.counterdirection = TIMER_COUNTER_UP;
-    // timer_initpara.period = ULTRASONIC_MAX_TOF_RELOAD;
-    // timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
-    // timer_initpara.repetitioncounter = 0;
-    // timer_init(US_ECHO_TIMER, &timer_initpara);
-
-    // timer_ic_parameter_struct timer_icinitpara;
-    // timer_channel_input_struct_para_init(&timer_icinitpara);
-    // timer_icinitpara.icpolarity = TIMER_IC_POLARITY_BOTH_EDGE;
-    // timer_icinitpara.icselection = TIMER_IC_SELECTION_INDIRECTTI;
-    // timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
-    // timer_icinitpara.icfilter = 0x03;
-    // timer_input_capture_config(US_ECHO_TIMER, US_ECHO_CH, &timer_icinitpara);
     
+    // 配置NVIC中断优先级（设置为较高优先级1，确保及时响应）
+    nvic_irq_enable(TIMER16_IRQn, 1);
 
+    // 注意：定时器配置完成但不启动，需要在其他地方调用timer_enable()启动
 }
 
 void ultrasonic_config(void) {

cmake/project_config.cmake

@@ -1,5 +1,5 @@
 # Project basic info
-set(PROJECT_NAME "gd32e23x")
+set(PROJECT_NAME "ultrasonic-analog")
 set(VERSION_MAJOR 1)
 set(VERSION_MINOR 0)
 set(VERSION_PATCH 0)
@@ -8,7 +8,7 @@ string(TIMESTAMP BUILD_DATE "%Y-%m-%d")
 
 # 编译条件（如IIC类型等）
 # set(IIC_TYPE "AutoDetectDriveCurrent")
-set(IIC_TYPE "HW-IIC")
+set(IIC_TYPE "24V")
 
 # 其它自定义宏
 add_definitions(-DIIC_TYPE=${IIC_TYPE})