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发表于 2015-10-30 17:08:04
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void Init_ADC( void )
{
ADCHSelect = 0;
ADC_ConvertedValue[0] = 0;
ADC_ConvertedValue[1] = 0;
ADC_ConvertedValue[2] = 0;
ADC_Relust[0] = 0;
ADC_Relust[1] = 0;
ADC_Relust[2] = 0;
SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
ADC0->SC1[0] = 0;
ADC0->SC1[1] = 0;
ADC0->SC2 |= 0x01; //差一点中枪,64K KL27,PTE30作为ADC输入
ADC0->SC3 |= 0x07;
ADC0->CFG1 = ADC_CFG1_MODE(3)|
ADC_CFG1_ADIV(3)|
ADC_CFG1_ADICLK(0)|
ADC_CFG1_ADLSMP_MASK;
ADC0->CFG2 = ADC_CFG2_ADLSTS(0)|
ADC_CFG2_ADHSC_MASK|
ADC_CFG2_ADLSTS(2);
NVIC_EnableIRQ(ADC0_IRQn);
}
void ADC_TrigCH(u8 ch_n)
{
ADC0->SC1[0] = ADC_SC1_AIEN_MASK | ADC_SC1_ADCH(ch_n & 0x1F);
}
void ADC0_IRQHandler()
{
u16 dat = ADC0->R[0];
switch ((ADC0->SC1[0] & 0x1F) - 8) {
case 0: ADC_ConvertedValue[0] = dat; break; //PTB0
case 1: ADC_ConvertedValue[1] = dat; break; //PTB1
default: ADC_ConvertedValue[2] = dat; break; //PTB30 增加ADC->SC2 |= 1后,ADC采样正确
}
}
测试结果:PTE30可以作为ADC输入使用 |
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