本帖最后由 pythonworld 于 2016-5-12 19:13 编辑 # i- X8 b+ S0 S 3 S3 I1 A2 U8 u7 D$ R 电机测速仪组成:ST188红外传感器+555施密特触发器+STM32开发板+LCD1602液晶显示屏 基本原理就是用定时器捕获功能测量测速脉冲的周期,然后转化为频率和转速。 x# }3 @) ^, i% t 主程序: & w4 ?+ t1 o* Q! s int main(void) { / u5 x. Z0 k/ j6 b3 O0 N /* USER CODE BEGIN 1 */) c ? U* k& R" L6 B% B# B" t- t 3 `7 u9 A" m* d) A1 [) G- P2 k /* USER CODE END 1 */ /* MCU Configuration----------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ {* a6 j+ @" v: k U6 L HAL_Init(); # p1 s2 P+ n5 @" ^+ P2 S /* Configure the system clock */ SystemClock_Config(); ) l# j5 M5 Q6 A5 \4 y0 E5 r /* Initialize all configured peripherals */ MX_GPIO_Init();5 T4 l) F; w7 x& ^ u) F! z; y8 l MX_USART2_UART_Init();$ ]2 ~; V& |/ Y4 G4 v" W7 s7 K: v+ J% J MX_TIM2_Init(); 4 Q# q: u1 H) G2 j /* USER CODE BEGIN 2 */ LCDCOM(0x38);/ M+ x) K( C6 \2 w5 [ r3 B LCDCOM(0x0c); LCDCOM(0x06); LCDCOM(0x01); HAL_TIM_Base_Start_IT(&htim2); HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1); __HAL_TIM_ENABLE_IT(&htim2, TIM_IT_TRIGGER); ) L+ H5 n( N" E+ q2 C5 x% D if(HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1) != HAL_OK)" i; Y" ]8 a& h- s& c" Q/ v { /* Starting Error */ Error_Handler(); } 4 D3 u" B: I/ \5 e+ F " f' r6 _ r. M) A0 ?1 o/ ~1 s /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */2 l) ?9 v3 I3 _7 a4 } while (1) {( I ^' U0 ]( p) t6 G /* USER CODE END WHILE */' [) H( v6 ?3 K5 w/ R /* USER CODE BEGIN 3 */ HAL_Delay(1200);- a& ^3 K& w+ S LCDCOM(0x01);( s, ~( k. b; Q% L HAL_Delay(10); LCDCOM(0x80); F8 {: x/ P7 f' z if(status) {/ h: E, J4 _3 [0 [- ]* ~ status = 0;1 b- s, B/ d0 z$ }( K9 |# U printf(" %6.0f RPM\n",8000000.0/uwIC2Value2*60); LCDCOM(0xc0); printf(" RUN \n");5 ?- P" z+ i3 H$ K, J# a4 y/ q- a: z if(uwIC2Value2<2) { LCDCOM(0xc0); printf(" HIGH \n"); } } else {% q" f5 @$ t2 t/ r/ S3 g4 s LCDCOM(0x80); printf(" 0 RPM \n");) L) z9 C- Y; ~7 ~) Z% R LCDCOM(0xc0);" _# m5 b) j' f- o5 r7 v) V5 ` printf(" STOP \n"); }+ w$ y. k4 V6 {. W& V5 _# t // LCDCOM(0x18);# \8 |" |- L$ T0 j! C, |% p: V7 F 4 T& \/ w! e. L2 u& L0 U5 ~ } /* USER CODE END 3 */5 N6 N% d. q/ d! T# g3 l: c2 @4 a7 L }3 d/ ?/ Y! U6 c& m" V V 7 y, H% e u4 n7 ~# s$ R% a' |. J 定时器触发捕获回调函数 : void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim), s& D3 V5 s8 k, O% j { // HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin); uwIC2Value2= HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);4 n) H2 e+ @* d: a' n status = 1;9 V9 D; V) [+ ]3 Q' a$ \6 g } 7 N- w' [9 x2 C3 f2 F" F ) w2 G; d0 Z# J# x. V |
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