ADS1248-STM32.rar_STM32 ADS1248_STM32+ADS1248_adc1248-STM32_ads1

/****************************************************************************** * @file adc.c * @author * @version V0.5 * @date 2011-05-12 * @brief ADC ADS1248 abstract functions ******************************************************************************/ /* Includes */ #include "adc.h" #include "define.h" /*Imported functions*/ //#define ADC_SET GPIO_SetBits(GPIOE, GPIO_Pin_11); //#define ADC_RESET GPIO_ReSetBits(GPIOE, GPIO_Pin_11); extern void Delay_us(u16 x); /* Private variables */ bool adc_task,pre_read; u16 adc_time_counter; //RTC for scheduling tasks, interrupts every 10mS u8 previous_adc_channel; adcdata ADData_IH, ADData_IC; vu8 RxIdx,bufferIdx; bool Err_Sensor=FALSE; /*vihot, vpcold signals */ double vihot,vpcold,prev_vihot,current_vihot,prev_vpcold; double filter_sensor; u16 Chan0_Com[buffer_size]; u16 Chan2_Com[buffer_size]; u16 Diag_Chan0_Com[1]; u16 Diag_Chan2_Com[1]; volatile bool channel_buffer_busy; vu32 temp_adcvh,temp_adcvc; u8 task_old=0; u32 ADCData; u8 i,j,k; u32 ADCInputData; adcdata ADCBuffer; u8 configure_conversion_chan; /********************************************************** @brief Init ADC private and public variables @params none @notes ***********************************************************/ void ADCInit(void) { /* 状态、变量初始化 */ adc_task = FALSE; pre_read = FALSE; adc_time_counter = ADC_Schedule; previous_adc_channel = CH2_COM; //select previous Channel CH2-COM as default ADData_IH.adc_8[3] = 0; ADData_IC.adc_8[3] = 0; RxIdx = 2; //MSB of ADC data bufferIdx = 0; vihot = 0.0; vpcold = 0.0; temp_adcvh = 0; temp_adcvc = 0; ADData_IH.adc_32 = 0; ADData_IC.adc_32 = 0; ADCBuffer.adc_32 = 0; channel_buffer_busy = FALSE; prev_vihot = 0.0; Diag_Chan0_Com[0] = 0; Diag_Chan2_Com[0] = 0; /* 寄存器初始化 */ ADC_CS_1; Delay_us(_120US_); ADC_CS_0; Delay_us(_5US_); ads1248_write_cmd_byte(ADS1248_RESET); //Reset to power-up values for debug Delay_us(_120US_); Delay_us(_120US_); //if(ADC_DYDR) //{ // Delay_us(_5MS_); // if(ADC_DYDR) // { // SetAsciiFont(ENUM_ASCII_12_24, 0xf800, 0x0000); // DisString(170, 105, "No sensor board!!!", 18); // } //} //while(ADC_DYDR) //读取AD1248的DRDY引脚的状态 // ; Delay_us(_5MS_); //用此延时时间来代替读取AD1248的DRDY引脚的状态 //ads1248_write_register(ADS1248_MUX0_ADDR, ADS1248_MUX_SP_AIN0 | ADS1248_MUX_SN_AIN1); //Positive Input AIN2,Negative Input AIN3 //Delay_us(_120US_); //ads1248_write_register(ADS1248_VBIAS_ADDR, ADS1248_VBIAS_AIN1); //AIN1 Vbias //Delay_us(_120US_); ads1248_write_register(ADS1248_MUX1_ADDR, ADS1248_VREFCON_ON | ADS1248_REFSELT_INT | ADS1248_MUXCAL_NORMAL); //Internal Oscillator;Internal Reference;Onboard reference selected;Normal operation Delay_us(_120US_); //延时等待，等待内部基准稳定 //ads1248_write_register(ADS1248_SYS0_ADDR, ADS1248_DOR_10SPS); //Gain=1;Highest data rate=10sps //Delay_us(_120US_); /* The IDACs require the internal reference to be on */ //ads1248_write_register(ADS1248_IDAC0_ADDR, ADS1248_DRDY_MODE_0 | ADS1248_IMAG_250UA); //ads1248_write_register(ADS1248_IDAC1_ADDR, ADS1248_I1DIR_IEXT1 | ADS1248_I2DIR_DIS); //Delay_us(_120US_); //ads1248_write_cmd_byte(ADS1248_SYNC); //Delay_us(_120US_); //ads1248_write_cmd_byte(ADS1248_SYSOCAL); //系统失调校准，调试时用：被选择的模拟输入VIN = 0时，执行该语句 //while(ADC_DYDR) //ADS1248的/DRDR脚为低电平时表示校准完成 // ; //ads1248_write_cmd_byte(ADS1248_SYSGCAL); //系统增益校准，调试时用：被选择的模拟输入为满量程时，执行该语句 //while(ADC_DYDR) //ADS1248的/DRDR脚为低电平时表示校准完成 // ; //ads1248_write_cmd_byte(ADS1248_SELFOCAL); //自身失调校准，调试时用：断开模拟输入端与内部电路的连接，且内部信号为0时执行该语句 //while(ADC_DYDR) //ADS1248的/DRDR脚为低电平时表示校准完成 // ; //ads1248_write_cmd_byte(ADS1248_RDATA); //发送读数据命令(读一次) ads1248_write_cmd_byte(ADS1248_RDATAC); //发送读数据命令(连续读) Delay_us(_120US_); ADC_CS_1; //cs is high } /*********************************************************************************** @brief Read from LTC2488 24 bit read MSB first bit 23 provides End of Conversion results Logic low is data ready bit 22 always 0 bit 21 sign, should be 1 for single ended conversions bit 20- bit4 (LSB) bit 3- bit0 all zeros @params @notes SPI port interfaces to ADC LTC2488 24 bit MSB first Configured as 8 bit reads ************************************************************************************/ void ADCConvert_Read(void) { if(previous_adc_channel == CH2_COM) { configure_conversion_chan = ch0_config; previous_adc_channel = CH0_COM; } else { configure_conversion_chan = ch2_config; previous_adc_channel = CH2_COM; } ADCConvert_AlternateRead(); MoveADCData(); } void ADCConvert_AlternateRead(void) { ADCData=0; ADCInputData = 0x40000000; ADCInputData |= (u32)(configure_conversion_chan<<8); //switch channel for next read ADC_CS_0; //cs is low //while(ADC_DYDR) //读取AD1248的DRDY引脚的状态 // ; Delay_us(_5US_); //用此延时时间来代替读取AD1248的DRDY引脚的状态 ADC_SCK_0; ADC_SDI_0; Delay_us(_5US_); for(i=0;i<24;i++) { if((ADCInputData&0x80000000) == 0x80000000) ADC_SDI_1; else ADC_SDI_0; ADCInputData <<= 1; ADC_SCK_1; Delay_us(_5US_); ADCData <<=1; if(ADC_SDO_IN==1) ADCData|=0x00000001; //sda==1 else {;} ADC_SCK_0; Delay_us(_5US_); } ADC_CS_1; //cs is high ADC_SDI_0; } /****************************************************************************** @brief MoveADCData @params none @notes move data from ADCBuffer struct to ADData_IC & ADData_IH struct store in Channel_0 and Channel_2 buffer *******************************************************************************/ void MoveADCData(void) { channel_buffer_busy = TRUE; if(previous_adc_channel == CH0_COM) { ADData_IC.adc_32 = ADCData; //通道已转换,现在读的是转换前通道的数据 } else { ADData_IH.adc_32 = ADCData; //通道已转换,现在读的是转换前通道的数据 } temp_adcvh = ADData_IH.adc_32 >> 8; Chan0_Com[bufferIdx] = (u16)(temp_adcvh & 0xFFFF); temp_adcvc = ADData_IC.adc_32 >> 8; Chan2_Com[bufferIdx] = (u16)(temp_adcvc & 0xFFFF); if(bufferIdx < (buffer_size - 1)) bufferIdx++; else bufferIdx =0; Diag_Chan0_Com[0]= Chan0_Com[0]; Diag_Chan2_Com[0]= Chan2_Com[0]; channel_buffer_busy = FALSE; } /************************************ @brief @params @notes *************************************/ void ComputeSignal(void) { double filter; u32 difference; /*if channels are not updating compute signal*/ if(!channel_buffer_busy) { vihot=(double)(max_min_chioce(Chan0_Com,7)*ADC_REF/ADC_FullScale); vpcold=(double)(max_min_chioce(Chan2_Com,7)*ADC_REF/ADC_FullScale); //vihot = (double) ((((Chan0_Com[0]+Chan0_Com[1]+Chan0_Com[2]+Chan0_Com[3])/4)*ADC_REF)/ADC_FullScale); //vpcold = (double) ((((Chan2_Com[0]+Chan2_Com[1]+Chan2_Com[2]+Chan2_Com[3]+Chan2_Com[4])/5)*ADC_REF)/ADC_FullScale); if((vpcold>1.05)||(vihot>0.95)||(vpcold<0.1)||(vihot<0.1)) Err_Sensor=TRUE;//sensor 故障检测。 } if(vihot >= prev_vihot) difference = 1000*(vihot - prev_vihot); //vihot加权处理 else difference = 1000*(prev_vihot - vihot); if(difference > 5) filter = 0.5; else filter = filter_sensor;