@21小跑堂、#申请原创
本文介绍软件设置工作流程:
一、初始化参数 初始化采用官方提供的驱动程序，直接调用AD7124_Setup(&g_ad7124dev,ad7124_regs)即可，寄存器配置需要根据自己需求进行相应配置，双通道采集配置参数如下： ad7124_st_reg ad7124_regs[AD7124_REG_NO] = { {0x00, 0x00, 1, 2}, /* AD7124_Status */ {0x01, 0x14C0, 2, 1}, /* AD7124_ADC_Control 全功率模式，连续转换0x04C0 ADC_CONTROL的DOUT_RDY_DEL位置1*/ {0x02, 0x0000, 4, 2}, /* AD7124_Data */ {0x03, 0x0000, 3, 1}, /* AD7124_IOCon1 */ {0x04, 0x0000, 2, 1}, /* AD7124_IOCon2 */ {0x05, 0x02, 1, 2}, /* AD7124_ID */ {0x06, 0x0000, 3, 2}, /* AD7124_Error */ {0x07, 0x0044, 3, 1}, /* AD7124_Error_En *///进行CRC校验 {0x08, 0x00, 1, 2}, /* AD7124_Mclk_Count */ {0x09, 0x8011, 2, 1}, // 读取通道0 8011 {0x0A, 0x0001, 2, 1}, /* AD7124_Channel_1 读取通道2 8031*/ {0x0B, 0x0001, 2, 1}, /* AD7124_Channel_2 */ {0x0C, 0x0001, 2, 1}, /* AD7124_Channel_3 */ {0x0D, 0x0001, 2, 1}, /* AD7124_Channel_4 */ {0x0E, 0x0001, 2, 1}, /* AD7124_Channel_5 */ {0x0F, 0x0001, 2, 1}, /* AD7124_Channel_6 */ {0x10, 0x0001, 2, 1}, /* AD7124_Channel_7 */ {0x11, 0x0001, 2, 1}, /* AD7124_Channel_8 */ {0x12, 0x0001, 2, 1}, /* AD7124_Channel_9 */ {0x13, 0x0001, 2, 1}, /* AD7124_Channel_10 */ {0x14, 0x0001, 2, 1}, /* AD7124_Channel_11 */ {0x15, 0x0001, 2, 1}, /* AD7124_Channel_12 */ {0x16, 0x0001, 2, 1}, /* AD7124_Channel_13 */ {0x17, 0x0001, 2, 1}, /* AD7124_Channel_14 */ {0x18, 0x0001, 2, 1}, /* AD7124_Channel_15 */ {0x19, 0x01E0, 2, 1}, /* AD7124_Config_0 *///PGA 1 0x01E0 {0x1A, 0x0000, 2, 1}, /* AD7124_Config_1 */ {0x1B, 0x0000, 2, 1}, /* AD7124_Config_2 */ {0x1C, 0x0000, 2, 1}, /* AD7124_Config_3 */ {0x1D, 0x0000, 2, 1}, /* AD7124_Config_4 */ {0x1E, 0x0000, 2, 1}, /* AD7124_Config_5 */ {0x1F, 0x0000, 2, 1}, /* AD7124_Config_6 */ {0x20, 0x0000, 2, 1}, /* AD7124_Config_7 */ //滤波和采样速度 {0x21, 0x010001, 3, 1}, //0x010001 {0x22, 0x000000, 3, 1}, /* AD7124_Filter_1 */ {0x23, 0x000000, 3, 1}, /* AD7124_Filter_2 */ {0x24, 0x000000, 3, 1}, /* AD7124_Filter _3 */ {0x25, 0x000000, 3, 1}, /* AD7124_Filter_4 */ {0x26, 0x000000, 3, 1}, /* AD7124_Filter_5 */ {0x27, 0x000000, 3, 1}, /* AD7124_Filter_6 */ {0x28, 0x000000, 3, 1}, /* AD7124_Filter_7 */ {0x29, 0x800000, 3, 1}, /* AD7124_Offset_0 */ {0x2A, 0x800000, 3, 1}, /* AD7124_Offset_1 */ {0x2B, 0x800000, 3, 1}, /* AD7124_Offset_2 */ {0x2C, 0x800000, 3, 1}, /* AD7124_Offset_3 */ {0x2D, 0x800000, 3, 1}, /* AD7124_Offset_4 */ {0x2E, 0x800000, 3, 1}, /* AD7124_Offset_5 */ {0x2F, 0x800000, 3, 1}, /* AD7124_Offset_6 */ {0x30, 0x800000, 3, 1}, /* AD7124_Offset_7 */ {0x31, 0x500000, 3, 1}, /* AD7124_Gain_0 */ {0x32, 0x500000, 3, 1}, /* AD7124_Gain_1 */ {0x33, 0x500000, 3, 1}, /* AD7124_Gain_2 */ {0x34, 0x500000, 3, 1}, /* AD7124_Gain_3 */ {0x35, 0x500000, 3, 1}, /* AD7124_Gain_4 */ {0x36, 0x500000, 3, 1}, /* AD7124_Gain_5 */ {0x37, 0x500000, 3, 1}, /* AD7124_Gain_6 */ {0x38, 0x500000, 3, 1}, /* AD7124_Gain_7 */ }; 这是读通道0数据，读通道1数据只需要修改0x09寄存器数据为0x8031（因为AVSS接地线），参数的设置需要详细看手册才能明白。
二、采集数据 每两个数求平均代码： unsigned long int GetAdAvrgValue(U32 * pdata,uint8_t num) { unsigned long int max, min; unsigned long int sum; uint8_t i; min = pdata[0]; // 赋值最小值 max = pdata[0]; // 赋值最大值 sum = pdata[0]; // 赋值累加第一个值 for(i=1; i<num; i++){ min = (min > pdata)? pdata:min; // 记录最大值 max = (max < pdata)? pdata:max; // 记录最小值 sum += pdata; // 数据累加 } if(num > 2){ return (sum - (max + min))/(num-2); // 数据放入处理数组中 } else { return sum/num; } } 手动切换通道代码：
ad7124_st_reg ad7124_regs_ch0[1]= { {0x09, 0x8011, 2, 1}, // 使能读取通道0 /***测试阶段0x8011***/ }; ad7124_st_reg ad7124_regs_ch1[1]= { {0x09, 0x8031, 2, 1}, // 使能读取通道1 /***测试阶段0x8031***/
}; 采集数据代码：
void InsertAdcData(void) { U16 i,j=0; U32 data1s_ch0[50]; U32 data1s_ch1[50]; AD7124_WriteRegister(&g_ad7124dev, ad7124_regs_ch0[0]); if( AD7124_WaitForConvReady(&g_ad7124dev,5) >= 0 ) //采集通道0数据 { AD7124_ReadRegister(&g_ad7124dev, &ad7124_regs[2]); stSysDataVar.gu32_ReadAdValue[0][gu8_ReadAdCnt_ch0++] = (ad7124_regs[2].value>>8)&0xFFFFFF; } AD7124_WriteRegister(&g_ad7124dev, ad7124_regs_ch1[0]); if( AD7124_WaitForConvReady(&g_ad7124dev,5) >= 0 ) //采集通道1数据 { AD7124_ReadRegister(&g_ad7124dev, &ad7124_regs[2]); stSysDataVar.gu32_ReadAdValue[2][gu8_ReadAdCnt_ch1++] = (ad7124_regs[2].value>>8)&0xFFFFFF; } if(gu8_ReadAdCnt_ch0>=ADC_VALUE_COLUMN) //每次需要采集100个点 { gu8_ReadAdCnt_ch0=0; gu8_ReadAdCnt_ch1=0; memcpy(stSysDataVar.gu32_ReadAdValue[1],stSysDataVar.gu32_ReadAdValue[0],ADC_VALUE_COLUMN*4); memcpy(stSysDataVar.gu32_ReadAdValue[3],stSysDataVar.gu32_ReadAdValue[2],ADC_VALUE_COLUMN*4); for(i=0;i<ADC_VALUE_COLUMN;i+=2) { data1s_ch0[j] = GetAdAvrgValue(stSysDataVar.gu32_ReadAdValue[1]+i,2); data1s_ch1[j] = GetAdAvrgValue(stSysDataVar.gu32_ReadAdValue[3]+i,2); j++; if(j>=50) { j=0; memcpy(stSysDataVar.ADC_AllData,data1s_ch0,50*4); memcpy(stSysDataVar.ADC_AllData+50,data1s_ch1,50*4); } } }
} 注意：采集数据之前需完成初始化配置，不然会出错。 这里是通过写0x09寄存器数据进行切换通道，每个通道读取的数据放在二维数组中，采集频率是100HZ，每10毫秒采集一个点，每次采集100个点的数据，采集100个点之后把这些临时数据拷贝到其它序号的二维数组中，这里是为了防止采集到的临时数据还没用就被下一次更新，然后把这100个点数据每两个求平均，得出50个点数据，采集频率就是50HZ了，最后求平均之后的数据赋值于一个数组，前边存通道0后边存通道1 数据，封装好之后供其它函数调用。
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