我在openwrt 中运行tcpdump程序提示 permission denied,该如何解决?账户已经是root了,不知道是哪里的问题
想搞一块4412开发板用来研究android源码,针对底层linux内核和android系统,适合么?
各位安安想请教一个有关于AD问题目前我使用MM32F031V8T这个MCU我目前我会用到两组AD通道AD0以及AD1动作我发现在切换过程中疑似有问题于是我就分开独立进行发现设定AD0通道动作读出来的数值不变维持在某值可是设定AD1却是可以行得通是我设定上哪里有问题吗?以下附程式码(初始化及读值)不好意思 要请教大家多多帮忙了><void ADC_Init(void){RCC->AHBENR |= 1<<17; //使能GPIOA时钟 RCC->APB2ENR |= RCC_APB2ENR_ADC1EN; //使能ADC1时钟 GPIOA->CRL &= 0XFFFFFF00; //PA0 anolog输入 RCC->APB2RSTR |= RCC_APB2RSTR_ADC1RST; //ADC interface reset RCC->APB2RSTR &= ~(RCC_APB2RSTR_ADC1RST); //ADC interface reset close ADC1->ADCFG |= ADCFG_ADCPRE_8|ADCFG_ADCPRE_10;//osc 8M*2/1 = 16M16MHz/(7+1)/2 = 1Mhz =>period = 2us ADC1->ADCR &= ~(ADCR_ADMD_PERIOD|ADCR_ADMD_CONTINUE|ADCR_ALIGN_LEFT);//单次非周期模式数据右对齐ADC1->ADCR |= ADCR_ADMD_SINGLE; ADC1->ADCFG |= ADCFG_ADEN; //ADC使能 ADC1->ADCR |= ADCR_ADST; //开始转换}uint16_t Func_GetADValue(void){ usADSTA = ADC1->ADSTA;ADC1->ADCFG &= ~ADCFG_ADEN; //ADC DisableADC1->ADSTA = 0x00;ADC1->ADCHS = ADCHS_CHEN0; //CH0=>ADCHS_CHEN0 ;CH0 =>ADCHS_CHEN1 (只改变这通道设定)ADC1->ADCR |= ADCR_ADST; //开始转换ADC1->ADCFG |= ADCFG_ADEN; //ADC enableADC1->ADCR |= ADCR_ADST;do{ usADSTA = ADC1->ADCR; usADSTA &= ADCR_ADST;}while(usADSTA != 0);usCH0Value = ADC1->ADDATA&0xfff;return usCH0Value;}