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#include "M051Series.h"
#include "ADC_drv.h"
#include "IO_drv.h"
uint16_t adcOutBuf[8];
uint16_t CurrentSlowOut;
/**************************************************************************
// ADC Initial
**************************************************************************/
void ADC_Init(void)
{
//set GPIO to Ain mode
SYS->P1_MFP.MFP0_AIN0_T2 = 1;
SYS->P1_MFP.ALT0_AIN0_T2 = 0;
PORT1->PMD.PMD0 = GPIO_INPUT;
SYS->P1_MFP.MFP1_AIN1_T3 = 1;
SYS->P1_MFP.ALT1_AIN1_T3 = 0;
PORT1->PMD.PMD1 = GPIO_INPUT;
SYS->P1_MFP.MFP2_AIN2_RXD1 = 1;
SYS->P1_MFP.ALT2_AIN2_RXD1 = 0;
PORT1->PMD.PMD2 = GPIO_INPUT;
SYS->P1_MFP.MFP3_AIN3_TXD1 = 1;
SYS->P1_MFP.ALT3_AIN3_TXD1 = 0;
PORT1->PMD.PMD3 = GPIO_INPUT;
SYS->P1_MFP.MFP4_AIN4_SS0 = 1;
SYS->P1_MFP.ALT4_AIN4_SS0 = 0;
PORT1->PMD.PMD4 = GPIO_INPUT;
SYS->P1_MFP.MFP5_AIN5_MOSI0 = 1;
SYS->P1_MFP.ALT5_AIN5_MOSI0 = 0;
PORT1->PMD.PMD5 = GPIO_INPUT;
SYS->P1_MFP.MFP6_AIN6_MISO0 = 1;
SYS->P1_MFP.ALT6_AIN6_MISO0 = 0;
PORT1->PMD.PMD6 = GPIO_INPUT;
SYS->P1_MFP.MFP7_AIN7_SCLK0 = 1;
SYS->P1_MFP.ALT7_AIN7_SCLK0 = 0;
PORT1->PMD.PMD7 = GPIO_INPUT;
SYSCLK->CLKSEL1.ADC_S = HCLK; //选择ADC时钟源:内部50M
SYSCLK->CLKDIV.ADC_N = 35; //ADC时钟频率 50M/此系数
SYSCLK->APBCLK.ADC_EN = 1; //使能ADC时钟
ADC->ADCR.ADEN = 1; //使能ADC模式
ADC->ADCR.DIFFEN = 0; //单端输入模式
ADC->ADCR.ADMD = 0; // 0 单次转换模式
ADC->ADCHER.CHEN = 0x01; //初始选择通道0
ADC->ADSR.ADF = 1; //清中断标志
ADC->ADCR.ADIE = 1; //ADC中断使能
ADC->ADCR.ADST = 1; //开始转换
NVIC_SetPriority(ADC_IRQn, 3);
NVIC_EnableIRQ(ADC_IRQn); //enable ADC interrupt
}
/**************************************************************************
// ADC interrupt process 42us one times
***************************************************************************/
void ADC_proc(void)
{
static uint16_t adcVol;
static uint8_t adcChIndex;
static uint32_t adcFiltBuf[8];
static uint32_t CurentFiltBuf;
ADC->ADSR.ADF = 1; //clear IRQ flag
adcVol = PORT_ADDR(ADC_CH0 + (adcChIndex << 2));
adcVol &= 0x00000FFF; // 12bit mask
adcVol = adcVol<<1;
if (adcChIndex == CURENT_CH) // used for clulometer processor
{
CurentFiltBuf += adcVol;
CurrentSlowOut = CurentFiltBuf >> CURRENT_FILTLEN; //4
CurentFiltBuf -= CurrentSlowOut;
CurrentSlowOut = CurrentSlowOut >> 1;
}
adcFiltBuf[adcChIndex] += adcVol;
adcVol = adcFiltBuf[adcChIndex] >> ADC_FILTLEN; //4
adcFiltBuf[adcChIndex] -= adcVol;
adcOutBuf[adcChIndex] = adcVol>>1;
adcChIndex++;
if(adcChIndex >= ADC_CH_NUM)
{
adcChIndex = 0;
}
ADC->ADCHER.CHEN = 1 << adcChIndex; //change to next channel
ADC->ADCR.ADST = 1; //start ADC
}
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阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
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