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一、题目
频率控制器的功能设计与实现 硬件框图 图1 频率控制器硬件框图 功能描述 1、LCD显示界面 以下为参考界面, 实现过程中选手可修改, 但显示的内容应包含题目要求的数据项。 (1) 测量界面 显示项目说明: PULS1、PULS2 PULS1通道: 对应显示脉冲信号 PULS1的频率; PULS2通道: 对应显示脉冲信号 PULS2的频率; 备注:频率测量范围应覆盖扩展板上 PULS1、PULS2信号的输出范围。 AO1、AO2 AO1:对应显示电位器 RP5的输出电压值, 保留小数点后2位有效数; AO2:对应显示电位器 RP6的输出电压值, 保留小数点后2位有效数字。 界面编号 测量界面数字编号为1 (2) 配置界面 显示项说明: - 分频系数 通过 PA6、PA7通道输出方波信号,信号频率为 PA1、PA2通道输入信号的N、M 分频,分频系数取值范 围1-4; - 界面编号 配置界面数字编号为2 2、按键功能 (1) B1按键, 设置功能, 按下按键后进入配置界面,再次按下,保存当前设置,切换回测量界面。 (2) B2按键, 选择功能, 按下按键可切换选择待配置的参数,被选择的参数项需高亮显示。 (3) B3按键, 加功能, 按下按键,当前选择的参数加1。 (4) B4按键, 减功能, 按下按键,当前选择的参数减1。 备注: 1) 按键 B3、B4仅在配置界面有效 2) 加、减操作应做合理的数据边界保护 3) 在参数配置过程中,PA6、PA7停止信号输出,保持低电平状态 3、参数存储功能 分频系数应保存在 E2RPOM 中,设备上电后应能重载参数。 4、指示灯功能 (1) 指示灯 LD1, 参数设置指示灯,进入参数配置界面时,指示灯点亮,退出后指示灯熄灭。 (2) 指示灯 LD8, 当电压 VAO1 > VAO2时指示灯点亮,反之指示灯熄灭。 5、试题说明 (1) 资源扩展板跳线配置参考: (2) 设备上电初始状态下,处于测量界面。 二、模块化代码分析 1、初始化部分以及一些变量的定义 变量的定义: u32 TimingDelay = 0; u8 string[20]; extern u16 LED_MODE; u8 Display_Flag = 0; u8 KEY_Flag = 0; u8 ADC_Flag = 0; u8 LED_Flag = 0; u8 Set_Pwm_Flag = 0; extern u8 TIM2_CH2_CAPTURE_MODE ; extern u32 TIM2_CH2_CAPTURE_H; extern u32 TIM2_CH2_CAPTURE_HL; extern u8 TIM2_CH3_CAPTURE_MODE; extern u32 TIM2_CH3_CAPTURE_H; extern u32 TIM2_CH3_CAPTURE_HL; u8 TIM2_CH2_Fre; u8 TIM2_CH3_Fre; u8 system_mode = 0; u8 ch1_psc = 1; u8 ch2_psc = 1; u8 select_psc; u16 output1_fre; u16 output2_fre; u16 output1_fre_last = 0; u16 output2_fre_last = 0; u8 ch1_enable; u8 ch2_enable; float AO1; float AO2; 系统初始化: STM3210B_LCD_Init(); LCD_Clear(Blue); LCD_SetBackColor(Blue); LCD_SetTextColor(White); SysTick_Config(SystemCoreClock/1000); //滴答定时器初始化 i2c_init(); //iic初始化 LED_Init(); //LED初始化 TIM2_CAPTURE_Init(); //TIM2捕获初始化 ch1_psc = _24c02_Read(0x11); //读取通道一分频系数 ch2_psc = _24c02_Read(0x22); //读取通道二分频系数 TIM3_OUTPUT_Init(0,0,50,50,1,ch1_enable,ch1_enable); //初始化TIM3作为比较输出 KEY_Init(); //按键初始化 ADC1_Init(); //ADC初始化 2、LED部分 if(LED_Flag) { LED_Flag = 0; if(!system_mode) //进入参数配置界面 LD1变化 { LED_MODE |= (1<<8); }else { LED_MODE &=~(1<<8); } if(AO1 > AO2) // LD8 { LED_MODE &=~(1<<15); }else { LED_MODE |= (1<<15); } GPIOC->ODR = LED_MODE; GPIOD->ODR |= (1<<2); GPIOD->ODR &=~(1<<2); } 3、ADC部分 ADC部分就比较简单了,获取两路ADC值分别计算就行 if(ADC_Flag) { ADC_Flag = 0; AO1 = Get_Adc(4) * 3.3 / 4096; AO2 = Get_Adc(5) * 3.3 / 4096; } 4、捕获部分处理 if(TIM2_CH2_CAPTURE_MODE == 3) //通道2捕获 { TIM2_CH2_Fre = 1000000 / TIM2_CH2_CAPTURE_HL / 1000; // 计算频率 kHZ TIM2_CH2_CAPTURE_MODE = 0; //清除捕获标志位 } if(TIM2_CH3_CAPTURE_MODE == 3) //通道3捕获 { TIM2_CH3_Fre = 1000000 / TIM2_CH3_CAPTURE_HL / 1000; // 计算频率 kHZ TIM2_CH3_CAPTURE_MODE = 0; //清除捕获标志位 } 5、显示部分 if(Display_Flag) { Display_Flag = 0; if(!system_mode) { LCD_SetTextColor(White); LCD_DisplayStringLine(Line1, (u8*)" Ce Shi Mode "); sprintf((char*)string,"PULS1:%d kHZ ",TIM2_CH2_Fre); LCD_DisplayStringLine(Line4, string); sprintf((char*)string,"PULS2:%d kHZ ",TIM2_CH3_Fre); LCD_DisplayStringLine(Line5, string); sprintf((char*)string,"AO1:%.2fV ",AO1); LCD_DisplayStringLine(Line6, string); sprintf((char*)string,"AO2:%.2fV ",AO2); LCD_DisplayStringLine(Line7, string); sprintf((char*)string," %d",system_mode+1); LCD_DisplayStringLine(Line9, string); }else { LCD_SetTextColor(White); LCD_DisplayStringLine(Line1, (u8*)" Pei Zhi Mode "); if(!select_psc) { LCD_SetTextColor(Yellow); }else { LCD_SetTextColor(White); } sprintf((char*)string,"PSC1:%d ",ch1_psc); LCD_DisplayStringLine(Line4, string); if(select_psc) { LCD_SetTextColor(Yellow); }else { LCD_SetTextColor(White); } sprintf((char*)string,"PSC2:%d ",ch2_psc); LCD_DisplayStringLine(Line5, string); sprintf((char*)string," %d",system_mode+1); LCD_DisplayStringLine(Line9, string); } } 6、按键部分 if(KEY_Flag)//每50ms扫描一次 { KEY_Flag = 0; //清除标志位 KEY_Read(); //按键读取函数 } void KEY_Read(void) { static u16 key1_sum,key2_sum,key3_sum,key4_sum; // KEY1 if(KEY1 == 0) { key1_sum++; if(key1_sum == 1) { system_mode ^= 1; //界面的切换 LCD_ClearLine(Line0); //清屏 LCD_ClearLine(Line1); LCD_ClearLine(Line2); LCD_ClearLine(Line3); LCD_ClearLine(Line4); LCD_ClearLine(Line5); LCD_ClearLine(Line6); LCD_ClearLine(Line7); LCD_ClearLine(Line8); LCD_ClearLine(Line9); if(!system_mode) // 如果是从设置界面切回主界面,则参数保存一次到eeprom { _24c02_Write(0x11,ch1_psc); Delay_Ms(5); _24c02_Write(0x22,ch2_psc); Delay_Ms(5); } } }else { key1_sum = 0; } // KEY2 if(KEY2 == 0) { key2_sum++; if(key2_sum == 1) { select_psc ^= 1; 分频系数的选择 } }else { key2_sum = 0; } // KEY3 if(KEY3 == 0) { key3_sum++; if(key3_sum == 1) { if(!select_psc) { ch1_psc++; if(ch1_psc >= 4) ch1_psc = 4; }else { ch2_psc++; if(ch2_psc >= 4) ch2_psc = 4; } } }else { key3_sum = 0; } // KEY4 if(KEY4 == 0) { key4_sum++; if(key4_sum == 1) { if(!select_psc) { ch1_psc--; if(ch1_psc <= 1) ch1_psc = 1; }else { ch2_psc--; if(ch2_psc <= 1) ch2_psc = 1; } } }else { key4_sum = 0; } } 7、PWM输出部分 if(Set_Pwm_Flag) //每200ms检查一次看看需不需要设置pwm { Set_Pwm_Flag = 0; if(TIM2_CH2_Fre) //如果通道2有设置频率,则使能响应的pwm { ch1_enable = 1; }else { ch1_enable = 0; } if(TIM2_CH3_Fre)//如果通道2有设置频率,则使能响应的pwm { ch2_enable = 1; }else { ch2_enable = 0; } output1_fre = TIM2_CH2_Fre * 1000 / ch1_psc; //计算频率 output2_fre = TIM2_CH3_Fre * 1000 / ch2_psc; //计算频率 if((output1_fre != output1_fre_last) || (output2_fre != output2_fre_last)) //如果频率与历史值有变化,则重新设置,否则则跳过 { TIM3_OUTPUT_Init(output1_fre,output2_fre,50,50,0,ch1_enable,ch2_enable); //对响应的通道进行操作 output1_fre_last = output1_fre; //保存作为历史值 output2_fre_last = output2_fre;//保存作为历史值 } } 8、滴答定时器以及中断部分 配置其实跟基础部分相差不大,实际上就是把很多个基础模块合并起来而已。具体的可以看我博客基础部分的讲解。 u8 TIM2_CH2_CAPTURE_MODE = 0; u32 TIM2_CH2_CAPTURE_H = 0; u32 TIM2_CH2_CAPTURE_HL = 0; u8 TIM2_CH3_CAPTURE_MODE = 0; u32 TIM2_CH3_CAPTURE_H = 0; u32 TIM2_CH3_CAPTURE_HL = 0; extern u16 CH1_Val; extern u16 CH2_Val; extern u16 CH1_Duty; extern u16 CH2_Duty; u8 TIM3_CH1_Flag; u8 TIM3_CH2_Flag; extern u8 KEY_Flag; extern u8 Display_Flag; extern u8 ADC_Flag; extern u8 LED_Flag; extern u8 Set_Pwm_Flag; u8 capture_flag = 0; void SysTick_Handler(void) { static u16 capture_sum = 0; static u16 display_sum = 0; static u8 key_sum = 0; static u8 setpwm_sum = 0; static u16 adc_sum = 0; static u16 led_sum = 0; TimingDelay--; if(++led_sum == 300) { led_sum = 0; LED_Flag = 1; } if(++adc_sum == 300) { adc_sum = 0; ADC_Flag = 1; } if(++setpwm_sum == 200) { setpwm_sum = 0; Set_Pwm_Flag = 1; } if(++key_sum == 50) //50ms { key_sum = 0; KEY_Flag = 1; } if(++capture_sum == 500) // 500ms { capture_sum = 0; capture_flag ^= 1; } if(++display_sum == 100) { display_sum = 0; Display_Flag = 1; } } void TIM3_IRQHandler(void) { u16 capture; if(TIM_GetITStatus(TIM3,TIM_IT_CC1) == 1) { TIM_ClearITPendingBit( TIM3, TIM_IT_CC1); capture = TIM_GetCapture1( TIM3); if(TIM3_CH1_Flag) { TIM_SetCompare1(TIM3,capture + CH1_Duty); }else { TIM_SetCompare1(TIM3,capture + CH1_Val - CH1_Duty); } TIM3_CH1_Flag ^= 1; } if(TIM_GetITStatus(TIM3,TIM_IT_CC2) == 1) { TIM_ClearITPendingBit( TIM3, TIM_IT_CC2); capture = TIM_GetCapture2( TIM3); if(TIM3_CH2_Flag) { TIM_SetCompare2(TIM3,capture + CH2_Duty); }else { TIM_SetCompare2(TIM3,capture + CH2_Val - CH2_Duty); } TIM3_CH2_Flag ^= 1; } } void TIM2_IRQHandler(void) { if(TIM_GetITStatus(TIM2,TIM_IT_CC2) == 1) { TIM_ClearITPendingBit( TIM2, TIM_IT_CC2); if(capture_flag) { switch(TIM2_CH2_CAPTURE_MODE) { case 0: TIM2_CH2_CAPTURE_H = 0; TIM2_CH2_CAPTURE_HL = 0; TIM2_CH2_CAPTURE_MODE = 1; TIM_OC2PolarityConfig( TIM2, TIM_ICPolarity_Falling); TIM_SetCounter(TIM2,0x0); break; case 1: TIM2_CH2_CAPTURE_H = TIM_GetCounter(TIM2); TIM_OC2PolarityConfig( TIM2, TIM_ICPolarity_Rising); TIM2_CH2_CAPTURE_MODE = 2; break; case 2: TIM2_CH2_CAPTURE_HL = TIM_GetCounter(TIM2); TIM_OC2PolarityConfig( TIM2, TIM_ICPolarity_Rising); TIM2_CH2_CAPTURE_MODE = 3; break; } }else { TIM2_CH2_CAPTURE_MODE = 0; TIM_OC2PolarityConfig( TIM2, TIM_ICPolarity_Rising); } } if(TIM_GetITStatus(TIM2,TIM_IT_CC3) == 1) { TIM_ClearITPendingBit( TIM2, TIM_IT_CC3); if(!capture_flag) { switch(TIM2_CH3_CAPTURE_MODE) { case 0: TIM2_CH3_CAPTURE_H = 0; TIM2_CH3_CAPTURE_HL = 0; TIM2_CH3_CAPTURE_MODE = 1; TIM_OC3PolarityConfig( TIM2, TIM_ICPolarity_Falling); TIM_SetCounter(TIM2,0x0); break; case 1: TIM2_CH3_CAPTURE_H = TIM_GetCounter(TIM2); TIM_OC3PolarityConfig( TIM2, TIM_ICPolarity_Rising); TIM2_CH3_CAPTURE_MODE = 2; break; case 2: TIM2_CH3_CAPTURE_HL = TIM_GetCounter(TIM2); TIM_OC3PolarityConfig( TIM2, TIM_ICPolarity_Rising); TIM2_CH3_CAPTURE_MODE = 3; break; } }else { TIM2_CH3_CAPTURE_MODE = 0; TIM_OC3PolarityConfig( TIM2, TIM_ICPolarity_Rising); } } } 三、通用初始化部分 #include "io.h" u16 LED_MODE = 0xffff; u16 CH1_Val; u16 CH2_Val; u16 CH1_Duty; u16 CH2_Duty; extern u8 system_mode; extern u8 ch1_psc; extern u8 ch2_psc; extern u8 select_psc; LED / void LED_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOD, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = 0xff00; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOC, &GPIO_InitStructure); GPIOC->ODR = LED_MODE; GPIOD->ODR |= (1<<2); GPIOD->ODR &=~(1<<2); } // 24c02 void _24c02_Write(u8 address,u8 data) { I2CStart(); I2CSendByte(0xa0); I2CWaitAck(); I2CSendByte(address); I2CWaitAck(); I2CSendByte(data); I2CWaitAck(); I2CStop(); } u8 _24c02_Read(u8 address) { u8 temp; I2CStart(); I2CSendByte(0xa0); I2CWaitAck(); I2CSendByte(address); I2CWaitAck(); I2CStart(); I2CSendByte(0xa1); I2CWaitAck(); temp = I2CReceiveByte(); I2CWaitAck(); I2CStop(); return temp; } /// capture // void TIM2_CAPTURE_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; TIM_ICInitTypeDef TIM_ICInitStructure; NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 ,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOA, &GPIO_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); TIM_TimeBaseInitStructure.TIM_Period = 0xffff; TIM_TimeBaseInitStructure.TIM_Prescaler = 71; TIM_TimeBaseInitStructure.TIM_ClockDivision = 0x0; TIM_TimeBaseInitStructure.TIM_CounterMode = 0x0; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure); TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStructure.TIM_ICFilter = 0x0; TIM_ICInit(TIM2, &TIM_ICInitStructure); TIM_ICInitStructure.TIM_Channel = TIM_Channel_3; TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStructure.TIM_ICFilter = 0x0; TIM_ICInit(TIM2, &TIM_ICInitStructure); TIM_Cmd(TIM2,ENABLE); TIM_ITConfig( TIM2,TIM_IT_CC2 | TIM_IT_CC3, ENABLE); } // PWM_OUTPUT // void TIM3_OUTPUT_Init(u16 ch1_val,u16 ch2_val,u8 ch1_duty,u8 ch2_duty,u8 status,u8 enable1,u8 enable2) { GPIO_InitTypeDef GPIO_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; TIM_OCInitTypeDef TIM_OCInitStructure; if(status) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 ,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOA, &GPIO_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); TIM_TimeBaseInitStructure.TIM_Period = 0xffff; TIM_TimeBaseInitStructure.TIM_Prescaler = 71; TIM_TimeBaseInitStructure.TIM_ClockDivision = 0x0; TIM_TimeBaseInitStructure.TIM_CounterMode = 0x0; TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure); } CH1_Val = 1000000 / ch1_val; CH2_Val = 1000000 / ch2_val; CH1_Duty = CH1_Val * ch1_duty / 100; CH2_Duty = CH2_Val * ch2_duty / 100; TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; if(enable1) { TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; }else { TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable; } TIM_OCInitStructure.TIM_Pulse = CH1_Val; TIM_OC1Init( TIM3,&TIM_OCInitStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; if(enable2) { TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; }else { TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable; } TIM_OCInitStructure.TIM_Pulse = CH2_Val; TIM_OC2Init( TIM3,&TIM_OCInitStructure); TIM_SetCounter(TIM3, 0x0); TIM_SetCompare1(TIM3,0x0); TIM_SetCompare2(TIM3,0x0); if(status) { TIM_Cmd( TIM3, ENABLE); TIM_ITConfig( TIM3,TIM_IT_CC1 | TIM_IT_CC2,ENABLE); } } / ADC / void ADC1_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; ADC_InitTypeDef ADC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOA, &GPIO_InitStructure); RCC_ADCCLKConfig(RCC_PCLK2_Div6); ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 1; ADC_Init(ADC1,&ADC_InitStructure); ADC_Cmd( ADC1,ENABLE); ADC_StartCalibration( ADC1); while(ADC_GetCalibrationStatus(ADC1)); ADC_ResetCalibration( ADC1); while(ADC_GetResetCalibrationStatus(ADC1)); } u16 Get_Adc(u8 channel) { u16 temp; ADC_RegularChannelConfig(ADC1, channel, 1,ADC_SampleTime_239Cycles5); ADC_SoftwareStartConvCmd(ADC1, ENABLE); while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == 0); temp = ADC_GetConversionValue(ADC1); ADC_SoftwareStartConvCmd(ADC1, DISABLE); return temp; } // KEY // void KEY_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init( GPIOB, &GPIO_InitStructure); } |
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