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82 lines
2.3 KiB
82 lines
2.3 KiB
#include "port.h"
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#include "systick.h"
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static ADC_InitStruType x;
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static GPIO_InitSettingType y;
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static bool adccapture_error = false;
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static uint16_t prv_adc_get_value() {
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ErrorStatus status = ADC_SoftStart();
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adccapture_error = false;
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if (status != SUCCESS) {
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adccapture_error = true;
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return 0;
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}
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uint32_t inticket = get_sys_ticket();
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while (ADC_GetConvStatus() != RESET) {
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if (port_haspassedms(inticket) > 10) {
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adccapture_error = true;
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return 0;
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}
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}
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uint16_t adcv = ADC_GetConvValue();
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ADC_SoftStop();
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return adcv ;
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}
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static void prv_adc_pb9_init() {
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y.Signal = GPIO_Pin_Signal_Analog; //模拟
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y.Dir = GPIO_Direction_Input; //输入
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y.Func = GPIO_Reuse_Func0;
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// x.CHS设置adc采集的通道每个引脚对应一个通道
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GPIO_Init(GPIO_Pin_B9, &y);
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//经过分频以后Tadclk=1/(PCLK/32)
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x.CLKS = ADC_CLKS_PCLK;
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x.CLKDIV = ADC_CLKDIV_1_32; /* ADC时钟源预分频 */
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//采集到的模拟量*3.3/4096=现在的电压
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x.VREF_SEL = ADC_VREF_SEL_0; /* 内部参考电压2.048v,仅设置内部参考电压为多少 */
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x.VREFP = ADC_VREFP_VDD; /* 选择芯片的工作电压VDD，这个是设置adc具体是要哪个电压来做参考adc的参考电压为多少 */
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x.VREFN = ADC_VREFN_VSS; /* 负向参考电压选择 */
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x.CHS = ADC_CHS_AIN4;
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// x.CHS = ADC_CHS_AIN8;
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x.SMPS = ADC_SMPS_SOFT; /* AD采样模式为软件控制 */
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//采样时间st*2+1(个Tadclk)=1.743us
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x.ST = 0; /* AD硬件采样时间选择 */
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x.BITSEL = ADC_BITSEL_8; /* AD分辨率12位 */
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ADC_Init(&x);
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prv_adc_get_value();
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}
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extern uint32_t getCNT();
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extern uint32_t getTOP();
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uint16_t capture(int timeoff) {
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static bool inited = false;
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if (inited == false) {
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prv_adc_pb9_init();
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inited = true;
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}
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uint16_t expectCNTBegin = getTOP() / 100.0 * timeoff;
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uint16_t expectCNTEnd = getTOP() / 100.0 * (timeoff + 1);
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// printf("%d %d , %d\n", timeoff, expectCNTBegin, expectCNTEnd);
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int icount = 0;
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while (true) {
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volatile uint16_t countnow = T16Nx_GetCNT1(T16N0);
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// printf("%d\n",countnow);
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for (size_t i = 0; i < icount % 10; i++) {
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}
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icount++;
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if (countnow >= expectCNTBegin && countnow < expectCNTEnd) {
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break;
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}
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}
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uint16_t v = prv_adc_get_value();
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return v;
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}
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