代码收藏家 STM32实现交流电流电压测量监控
本文介绍通过STM32和BL0942进行交流电流的测量和监控
能脉冲。
本文介绍如何通过STM32 以串口模式对BL0942进行配置读取，同时通过CF1监控过流，不多废话，直接上代码
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1.宏定义
**
#define Addr_I_WAVE 0x01 //电流通道波形 *
#define Addr_V_WAVE 0x02 //电压通道波形*
#define Addr_I_RMS 0x03 //电流有效值
#define Addr_V_RMS 0x04 //电压有效值
#define Addr_I_FAST_RMS 0x05 //电流快速有效值*
#define Addr_WATT 0x06 //有功功率
#define Addr_CF_CNT 0x07 //有功电能脉冲计数
#define Addr_FREQ 0x08 //工频频率
#define Addr_STATUS 0x09 //状态
#define Addr_VERSION 0x0F //版本
//用户操作寄存器
#define Addr_I_CHOS 0x11 //电流通道直流偏置校正
#define Addr_I_RMSOS 0x12 //电流通道有效值小信号校正
#define Addr_WA_CREEP 0x14 //有功功率防潜阈值
#define Addr_FAST_RMS_TH 0x15 //
#define Addr_FAST_RMS_CYC 0x16
#define Addr_FREQ_CYC 0x17
#define Addr_MASK 0x18
#define Addr_MODE 0x19
#define Addr_GAIN_CR 0x1A
#define Addr_SOFT_RESET 0x1C //软复位
#define Addr_WRPROT 0x1D //用户写保护设置
//注意 BL0940的读命令字节固定为0x58+ICAddr，写命令字节固定为0xA8+ICAddr；SOP10封装芯片的IC_Addr地址固定为0
// BL0942 TSSOP14封装带地址选择管脚，需根据A1~A2地址选择管脚的电平配置命令字节，可以进行多机并联通信
#define BL0942_Addr_R 0x58
#define BL0942_Addr_w 0xA8
//出厂校准芯片，增益控制1%以内，外围器件精度控制1%以内，采用同一系数，不用 EEPROM保存参数
// 电流采用1毫欧电阻采样，电压采用390K*5+0.51K进行分压，实际测试发现电阻存在偏差，进行微调
//BL0942评估版，立创直接贴片合金电阻(台湾厚声MS121WF100NT4E )，实际测量比1毫欧偏小，约0.93毫欧
#define Power_K 5798;//580;// // 3537*1毫欧*0.51K*1000/(1.218*1.218)/(390K*5+0.51K) 功率转换系数
#define Current_K 23362;//233628;//23362 // 305978*1毫欧/1.218 电流转换系数
#define Voltage_K 15883; // 73989*0.51K*1000/1.218/(390K*5+0.51K) 电压转换系数
#define Energy_K 4976; // 3600000*Power_K/16384/256 电能转换系数，电能脉冲计数，对应于1度电的脉冲计数
//采用美隆0.001毫欧贴片合金电阻，实际比1毫欧偏大，约1.023毫欧
/*
#define Power_K 6378; // 功率转换系数
#define Current_K 25699; // 电流转换系数
#define Voltage_K 15883; // 电压转换系数
#define Energy_K 5474; //
*/
2.寄存器读写驱动
/**
* @brief Read Bl0942 register.
* @note the reslt will be stored in BL0942_Elect,the converted I/V Parameter will be stored in BL0942_Elect
* @param ICAddr Uart address of BL0942 .
* @param Reg Target register to read data from.
* @param Timeout Timeout duration.
* @retval Flag_BL0942_R
*/
uint8_t BL0942_Uart1_R(uint8_t ICAddr,uint8_t Reg,uint32_t Timeout)
{
uint8_t tmp_2,aTxBuffer[2] = {0},aRxBuffer[4] = {0};
FourBytes_Type tmp_D;
tmp_2=huart1.Instance->RDR;//???
aTxBuffer[0]= ICAddr;
aTxBuffer[1]= Reg;
if(HAL_UART_Transmit(&huart1, (uint8_t*)aTxBuffer, 2, Timeout)!= HAL_OK)
{
Error_Handler();
}
if(HAL_UART_Receive(&huart1, (uint8_t *)aRxBuffer, 4, Timeout) != HAL_OK)
{
Error_Handler();
}
tmp_D.uByte[0]=aRxBuffer[0];
tmp_D.uByte[1]=aRxBuffer[1];
tmp_D.uByte[2]=aRxBuffer[2];
tmp_2 = aTxBuffer[0] + aTxBuffer[1] + aRxBuffer[0] + aRxBuffer[1] + aRxBuffer[2];
tmp_2=~tmp_2; //计算的校验和字节
if (aRxBuffer[3]==tmp_2)
{
Flag_BL0942_R = 1;
switch (Reg)
{
case Addr_I_RMS:
tmp_D.uLongs=tmp_D.uLongs*100/Current_K;
BL0942_Elect.Current_Value=tmp_D.uLongs;
break;
case Addr_V_RMS:
tmp_D.uLongs=tmp_D.uLongs*100/Voltage_K;
BL0942_Elect.Voltage_Value=tmp_D.uLongs;
break;
case Addr_WATT:
tmp_D.uLongs=tmp_D.uLongs*100/Power_K;
BL0942_Elect.Power_Value=tmp_D.uLongs;
break;
case Addr_FREQ:
tmp_D.uLongs=100000000/tmp_D.uLongs; //转换为实际频率
BL0942_Elect.Freq=tmp_D.uLongs;
break;
case Addr_I_FAST_RMS: //I_FAST_RMS
tmp_D.uLongs=tmp_D.uLongs*100/Current_K;
BL0942_Elect.F_Current_Value=tmp_D.uLongs;
break;
case Addr_CF_CNT: //电能脉冲计数
if (tmp_D.uLongs>=BL0942_Elect.Fir_CF_CNT)
{
BL0942_Elect.Mid_CF_CNT+=(tmp_D.uLongs-BL0942_Elect.Fir_CF_CNT);
}
else //电能脉冲计数累积满出现溢出情况
{
BL0942_Elect.Mid_CF_CNT+=(tmp_D.uLongs+(0xFFFFFF-BL0942_Elect.Fir_CF_CNT));
}
BL0942_Elect.Fir_CF_CNT=tmp_D.uLongs;
//判断是否累积超过1度电的脉冲数,需要确保读取时间间隔内的电量不超过1度电，否则用整除
tmp_D.uLongs=Energy_K;
if (BL0942_Elect.Mid_CF_CNT>=tmp_D.uLongs)
{
BL0942_Elect.Energy_kwh++;
BL0942_Elect.Mid_CF_CNT-=Energy_K;
}
break;
case Addr_WA_CREEP:
if( tmp_D.uByte[0] == 11)
{
//communication success between WB55 and BL0942
}
else
{
//communication fail between WB55 and BL0942
}
break;
case Addr_MASK:
BL0942_Uart_Buffer[2] = tmp_D.uByte[0] |0x01;
break;
case Addr_MODE:
BL0942_Uart_Buffer[2] = tmp_D.uByte[0];
BL0942_Uart_Buffer[3] = tmp_D.uByte[1] | 0x03;
break;
case Addr_FAST_RMS_TH:
break;
default:
break;
}
}
else
{
Flag_BL0942_R = 0;
}
return Flag_BL0942_R;
}
/**
* @brief Write Bl0942 user configuraetion register.
* @note
* @param PData[0] Uart address of BL0942 .
* @param PData[1] Target register to be written.
* @param PData[2...4] the config data.
* @param PData[5] CHSUM.
* @param Timeout Timeout duration.
* @retval
*/
void BL0942_Uart1_W(uint8_t *pData,uint32_t Timeout)
{
//send ICAddr & Reg address
if(HAL_UART_Transmit(&huart1, (uint8_t*)pData, 6, Timeout)!= HAL_OK)
{
Error_Handler();
}
}
void USART1_BaudRate_Reconfig(uint32_t baud)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = baud;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_8;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
}
3.调用驱动进行串口波特率、过流阀值、CF1功能配置
/enable Reg modification
BL0942_Uart_Buffer[1] = Addr_WRPROT;
BL0942_Uart_Buffer[2] = 0x55;
BL0942_Uart_Buffer[3] = 0x00;
BL0942_Uart_Buffer[4] = 0x00;
BL0942_Uart_Buffer[5] = ~( BL0942_Uart_Buffer[0] + BL0942_Uart_Buffer[1] + BL0942_Uart_Buffer[2] + BL0942_Uart_Buffer[3] + BL0942_Uart_Buffer[4]);
BL0942_Uart1_W((uint8_t*)BL0942_Uart_Buffer,TIMEOUT);
//modify the Baudrate to 38400
BL0942_Uart1_R(BL0942_Addr_R,Addr_MODE,TIMEOUT); //read the Mode_Reg
BL0942_Uart_Buffer[1] = Addr_MODE;
BL0942_Uart_Buffer[4] = 0x00;
BL0942_Uart_Buffer[5] = ~( BL0942_Uart_Buffer[0] + BL0942_Uart_Buffer[1] + BL0942_Uart_Buffer[2] + BL0942_Uart_Buffer[3] + BL0942_Uart_Buffer[4]);
BL0942_Uart1_W((uint8_t*)BL0942_Uart_Buffer,TIMEOUT);
HAL_Delay(1);
USART1_BaudRate_Reconfig(38400); //set the MCU USART1 BAUDRATE to 38400
//modify the target reg
BL0942_Uart_Buffer[1] = Addr_FAST_RMS_TH;
BL0942_Uart_Buffer[2] = 0x21;
BL0942_Uart_Buffer[3] = 0x02;
BL0942_Uart_Buffer[4] = 0x00;
BL0942_Uart_Buffer[5] = ~( BL0942_Uart_Buffer[0] + BL0942_Uart_Buffer[1] + BL0942_Uart_Buffer[2] + BL0942_Uart_Buffer[3] + BL0942_Uart_Buffer[4]);
BL0942_Uart1_W((uint8_t*)BL0942_Uart_Buffer,TIMEOUT); //set the overcurrent point: 0x221:1.5A
BL0942_Uart1_R(BL0942_Addr_R,Addr_MASK,TIMEOUT); //Read the OT_FUNX_Reg
BL0942_Uart_Buffer[1] = Addr_MASK;
BL0942_Uart_Buffer[3] = 0x00;
BL0942_Uart_Buffer[4] = 0x00;
BL0942_Uart_Buffer[5] = ~( BL0942_Uart_Buffer[0] + BL0942_Uart_Buffer[1] + BL0942_Uart_Buffer[2] + BL0942_Uart_Buffer[3] + BL0942_Uart_Buffer[4]);
BL0942_Uart1_W((uint8_t*)BL0942_Uart_Buffer,TIMEOUT); //set the CF1 out to overcurrent indicator
//lock
BL0942_Uart_Buffer[1] = Addr_WRPROT;
BL0942_Uart_Buffer[2] = 0x00;
BL0942_Uart_Buffer[3] = 0x00;
BL0942_Uart_Buffer[4] = 0x00;
BL0942_Uart_Buffer[5] = ~( BL0942_Uart_Buffer[0] + BL0942_Uart_Buffer[1] + BL0942_Uart_Buffer[2] + BL0942_Uart_Buffer[3] + BL0942_Uart_Buffer[4]);
BL0942_Uart1_W((uint8_t*)BL0942_Uart_Buffer,TIMEOUT);
4.读取电流有效值及验证寄存器配置值，
BL0942_Uart1_R(BL0942_Addr_R,Addr_FAST_RMS_TH,TIMEOUT);
BL0942_Uart1_R(BL0942_Addr_R,Addr_MASK,TIMEOUT);
BL0942_Uart1_R(BL0942_Addr_R,Addr_I_RMS,TIMEOUT);
**注意：
1. BL0942自身不带保存功能，每次上电都要重新配置
2. 串口波特率4800 和9600是通过外部条线的方式配置，19200 和38400则需要统通MODE寄存器进行配置**
