我的目的是采样外部连接PA1,PA2两个模拟信号，以及内部16通道的内部温度。
使用注入方式采样，由外部定时器事件触发，然后ADC连续采样3个通道，最后触发ADC_IT_JEOC中断进行处理
实验的初始化代码如下
void ad_init(void) {
memset(&ad, 0, sizeof(ad));
ADC_InitTypeDef ADC_InitStructure = { 0 };
GPIO_InitTypeDef GPIO_InitStructure = { 0 };
NVIC_InitTypeDef NVIC_InitStructure = { 0 };
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// ADC1->CTLR1 = 0x00000180;
// ADC1->CTLR2 = 0x00808801;
// ADC1->ISQR = 0x00204020;
// ADC1->SAMPTR1 = 0x00080000;
// ADC1->SAMPTR2 = 0x00000012;
ADC_DeInit(ADC1);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigInjecConv_T1_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 0;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_InjectedDiscModeCmd(ADC1, DISABLE);
ADC_ExternalTrigInjectedConvCmd(ADC1, ENABLE);
ADC_InjectedSequencerLengthConfig(ADC1, 3);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_1, 0,ADC_SampleTime_28Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_2, 1,ADC_SampleTime_28Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_16, 2,ADC_SampleTime_28Cycles5);
ADC_ITConfig(ADC1, ADC_IT_JEOC, ENABLE);
ADC_Cmd(ADC1, ENABLE);
Delay_Us(50);
ADC_TempSensorVrefintCmd(ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
Calibrattion_Val = Get_CalibrationValue(ADC1);
NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void timer_init(void) {
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure = { 0 };
//定时器1的刷新时间触发AD采样
RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseInitStructure.TIM_Period = 56250; //=72000000/12800
TIM_TimeBaseInitStructure.TIM_Prescaler = 0; //不分频
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV4;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
TIM_Cmd(TIM1, ENABLE);
}
首先发现了一个bug
ADC_InjectedChannelConfig函数的描述内rank的解释有问题他的取值范围说明是1~4，但实测是0~3.
在中断内读取ADC1->IDATAR1~ADC1->IDATAR3，发现他们的值居然不随外部的电压变化，经使用demo测试判断硬件是没有问题的。
这个问题已经折腾2天，目前没有任何进展，望技术支持
