san m
Weight scale using ADS1220
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WeightScale
by 
san m
Diff: main.cpp
- Revision:
- 0:94208ccccbde
- Child:
- 1:933f47cce5bf
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue May 24 13:45:41 2016 +0000
@@ -0,0 +1,482 @@
+#include "mbed.h"
+#include "ADS1220.h"
+#include "DigoleSerialDisp.h"
+#include "DataAnalysis.h"
+#include "MedianFilt.h"
+#include "math.h"
+
+
+#define NWIDTH 20 /* Size of the data buffer; length of the sequence. */
+#define STOPPER 0 /* Smaller than any datum */
+#define AVERGARE_COUNT 1000 /*Count can be any number from 2,4,8,16 */
+
+#define PGA 128 // Programmable Gain = 1
+#define VREF 5.0 // Internal reference of 2.048V
+#define VFSR VREF/PGA
+#define FSR (((long int)1<<23))
+#define LSB_Size (VFSR/FSR)
+
+ADS1220 ads1220_com(SPI_MOSI, SPI_MISO, SPI_SCK);
+Serial _serial_comm(SERIAL_TX,SERIAL_RX);
+Serial data_serial(USBTX, USBRX);
+SerialDisp Lcd_display(LCD_MOSI, LCD_MISO, LCD_SCK);
+InterruptIn DRDY(PC_5);
+InterruptIn Button_press(USER_BUTTON);
+
+unsigned char str[] = "PCE Force Gauge ";
+unsigned char removeweight_str[] = "Please Remove Weights....... ";
+unsigned char placeweight_str[] = "Calculating the offset..... ";
+
+
+
+
+
+char New_data_avialable,button_pressed = 0,Analysis;
+void ext_int_DRDY(void);
+void showvolt(float volts);
+void menu(void);
+signed long avg_filter(signed long avg_val, int n);
+void Caliberation(void);
+void pressed(void);
+float code2enob(float c);
+void weight_cal(void);
+signed long Median(signed long median_val, int n, int median_cnt);
+float g2scale(float g, int scale);
+float medfilter(signed long datum);
+float median(signed long data[]);
+float Mode_Filter(signed long avg_val, int n);
+float code2volt(float c);
+
+signed long tData,avg_tdata;
+unsigned config_Buff[4];
+float offset_Val = 0, actual_weight = 0,disp_wt,volt;
+char get_char;
+
+int main()
+{
+ char buf[10],time_buf[14];
+ Button_press.mode(PullUp);
+ // Delay for initial pullup to take effect
+ wait(0.1);
+ DRDY.rise(&ext_int_DRDY);
+ Button_press.fall(&pressed);
+ ads1220_com.Config();
+ ads1220_com.SendStartCommand();
+ Lcd_display.LCD12864_Initialise();
+ data_serial.baud(115200);
+ // Setup a serial interrupt function to receive data
+ _serial_comm.attach(&SerialData::Rx_interrupt, _serial_comm.RxIrq);
+ // Setup a serial interrupt function to transmit data
+ _serial_comm.attach(&SerialData::Tx_interrupt, _serial_comm.TxIrq);
+ Lcd_display.LCD12864_DrawLogo();
+ set_time(1887180123); // Set RTC time to 16 December 2013 10:05:23 UTC
+ while(1)
+ {
+ clock_t seconds = time(NULL);
+ weight_cal();
+ strftime(time_buf,sizeof(time_buf), "%I:%M:%S (%p)", localtime(&seconds));
+ Lcd_display.LCD12864_DisplayString(0,0,(uint8_t *)&str[0],COUNTOF(str));
+ Lcd_display.LCD12864_DisplayString(1,0,(uint8_t *)&time_buf[0],COUNTOF(time_buf));
+ sprintf(buf,"%.4f KG", (float)disp_wt);
+ wait_ms(2);
+ Lcd_display.LCD12864_DisplayString(2,2,(uint8_t *)&buf[0],COUNTOF(buf));
+ wait(0.5);
+ if(Button_press)
+ {
+ Analysis = 1;
+ }
+ }
+}
+
+
+
+void weight_cal(void)
+{
+ if(button_pressed)
+ {
+ button_pressed = 0;
+ if(New_data_avialable)
+ {
+ New_data_avialable = 0;
+ Caliberation();
+ wait(1);
+ }
+ }
+ else
+ {
+ if(New_data_avialable)
+ {
+ //led = !led;
+ New_data_avialable = 0;
+ tData = ads1220_com.ReadData();
+ volt = code2volt(tData);
+ data_serial.printf("\rVoltage : %f\n",volt);
+ avg_tdata = Mode_Filter(tData, AVERGARE_COUNT);
+ //data_serial.printf("\r\nHex code %x",avg_tdata);
+ actual_weight = avg_tdata - offset_Val;
+ disp_wt = actual_weight/weight_gram ;
+ disp_wt = disp_wt * gain_error_correction;
+ disp_wt = g2scale(disp_wt,3);
+ //data_serial.printf("\r%.4f\n",disp_wt);
+ //data_serial.printf("\t KG\n");
+ }
+ }
+}
+
+
+float code2volt(float c)
+{
+ float Vout = 0;
+ Vout = (float)(c*LSB_Size*1000); //In mV
+ return Vout;
+}
+
+
+float g2scale(float g, int scale)
+{
+ switch(scale)
+ {
+ case 0:
+ return g*1e6;
+ case 1:
+ return g*1e3;
+ case 2:
+ return g;
+ case 3:
+ return g/1e3;
+ case 4:
+ return g*(16.0/453.59237);
+ case 5:
+ return g/453.59237;
+ case 6:
+ return g/(14.0*453.59237);
+ default: // something wrong
+ return 0;
+ }
+}
+
+float code2enob(float c)
+{
+ if (c==0) return 24.0;
+ return 24.0- logf(c);
+
+}
+
+void pressed(void)
+{
+ button_pressed = 1;
+}
+signed long avg_filter(signed long avg_val, int n)
+{
+ int i;
+ signed long mean;
+ mean=0;
+ for (i=0;i<n;++i)
+ mean+= avg_val;
+ return mean/n;
+}
+void Caliberation(void)
+{
+ signed long cal_offset = 0;
+ Lcd_display.LCD12864_CLEAR();
+ wait_ms(2);
+ Lcd_display.LCD12864_DisplayString(1,0,(unsigned char *)&removeweight_str[0],COUNTOF(removeweight_str));
+ data_serial.printf("\rPlease Remove Weights.......\n");
+ wait(2);
+ Lcd_display.LCD12864_CLEAR();
+ wait_ms(2);
+ Lcd_display.LCD12864_DisplayString(1,0,(unsigned char *)&placeweight_str[0],COUNTOF(placeweight_str));
+ data_serial.printf("\rCalculating the offset......\n");
+ wait(2);
+ tData = ads1220_com.ReadData();
+ offset_Val = Mode_Filter(tData, AVERGARE_COUNT);
+ cal_offset = (offset_Val / (weight_gram));
+ cal_offset = cal_offset * gain_error_correction;
+ cal_offset = g2scale(cal_offset,3);
+ data_serial.printf("\r%.4f",(float *)cal_offset);
+ Lcd_display.LCD12864_CLEAR();
+ wait_ms(1);
+}
+
+
+float Mode_Filter(signed long avg_val, int n)
+{
+ float returnval = 0;
+ // read multiple values and sort them to take the mode
+ signed long sortedValues[n];
+ for(int i=0;i<n;i++)
+ {
+ signed long value = avg_val;
+ int j;
+ if(value < sortedValues[0] || i==0)
+ {
+ j=0; //insert at first position
+ }
+ else
+ {
+ for(j=1;j<i;j++){
+ if(sortedValues[j-1]<=value && sortedValues[j]>=value)
+ {
+ // j is insert position
+ break;
+ }
+ }
+ }
+ for(int k=i;k>j;k--)
+ {
+ // move all values higher than current reading up one position
+ sortedValues[k]=sortedValues[k-1];
+ }
+ sortedValues[j]=value; //insert current reading
+ }
+ //return scaled mode of 700 values
+ for(int i=200;i<800;i++)
+ {
+ returnval +=sortedValues[i];
+ }
+ returnval = returnval/600;
+ return returnval;
+}
+
+void Set_Disp_Mux_config()
+{
+ char Mux_data;
+
+
+ Mux_data = data_serial.getc();
+ data_serial.printf("\n");
+
+ switch(Mux_data)
+ {
+
+ case '0':
+ ads1220_com.set_MUX(0);
+ data_serial.printf("Input Multiplexer Configuration Set to 0: AINP = AIN0, AINN = AIN1\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '1':
+ ads1220_com.set_MUX(1);
+ data_serial.printf("Input Multiplexer Configuration Set to 1: AINP = AIN0, AINN = AIN2\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '2':
+ ads1220_com.set_MUX(2);
+ data_serial.printf("Input Multiplexer Configuration Set to 2: AINP = AIN0, AINN = AIN3\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '3':
+ ads1220_com.set_MUX(3);
+ data_serial.printf("Input Multiplexer Configuration Set to 3: AINP = AIN1, AINN = AIN2\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '4':
+ ads1220_com.set_MUX(4);
+ data_serial.printf("Input Multiplexer Configuration Set to 4: AINP = AIN1, AINN = AIN3\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '5':
+ ads1220_com.set_MUX(5);
+ data_serial.printf("Input Multiplexer Configuration Set to 5: AINP = AIN2, AINN = AIN3\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '6':
+ ads1220_com.set_MUX(6);
+ data_serial.printf("Input Multiplexer Configuration Set to 6: AINP = AIN1, AINN = AIN0\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '7':
+ ads1220_com.set_MUX(7);
+ data_serial.printf("Input Multiplexer Configuration Set to 7: AINP = AIN3, AINN = AIN2\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '8':
+ ads1220_com.set_MUX(8);
+ data_serial.printf("Input Multiplexer Configuration Set to 8: AINP = AIN0, AINN = AVSS\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '9':
+ ads1220_com.set_MUX(9);
+ data_serial.printf("Input Multiplexer Configuration Set to 9: AINP = AIN1, AINN = AVSS\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ default:
+ break;
+
+
+ }
+}
+
+void Set_Disp_Gain_config(void)
+{
+ char Mux_data;
+
+
+ Mux_data = data_serial.getc();
+ data_serial.printf("\n");
+
+ switch(Mux_data)
+ {
+
+ case '0':
+ ads1220_com.set_GAIN(0);
+ data_serial.printf("Set Gain Configuration to 0 for Gain = 1 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '1':
+ ads1220_com.set_GAIN(1);
+ data_serial.printf("Set Gain Configuration to 1 for Gain = 2 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '2':
+ ads1220_com.set_GAIN(2);
+ data_serial.printf("Set Gain Configuration to 2 for Gain = 4 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '3':
+ ads1220_com.set_GAIN(3);
+ data_serial.printf("Set Gain Configuration to 3 for Gain = 8 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '4':
+ ads1220_com.set_GAIN(4);
+ data_serial.printf("Set Gain Configuration to 4 for Gain = 16 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '5':
+ ads1220_com.set_GAIN(5);
+ data_serial.printf("Set Gain Configuration to 5 for Gain = 32 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '6':
+ ads1220_com.set_GAIN(6);
+ data_serial.printf("Set Gain Configuration to 6 for Gain = 64 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '7':
+ ads1220_com.set_GAIN(7);
+ data_serial.printf("Set Gain Configuration to 7 for Gain = 128 \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ default:
+ break;
+ }
+}
+
+void Set_Disp_Bypass_config(void)
+{
+ char Bypass_data;
+
+
+ Bypass_data = data_serial.getc();
+ data_serial.printf("\n");
+
+ switch(Bypass_data)
+ {
+
+ case '0':
+ ads1220_com.set_PGA_BYPASS(0);
+ data_serial.printf("Set PGA Bypass Configuration to 0 for PGA Enabling \n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+ case '1':
+ ads1220_com.set_PGA_BYPASS(1);
+ data_serial.printf("Set PGA Bypass Configuration to 1 for PGA Disabled and bypassed\n");
+ ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
+ data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
+ break;
+
+ default:
+ break;
+ }
+}
+
+void menu(void)
+{
+ uint8_t data;
+
+ data_serial.printf("Menu :\n");
+ data_serial.printf("\r0.Set Input Multiplexer Configuration\n");
+ data_serial.printf("\r1.Set Gain\n");
+ data_serial.printf("\r2.Set Data Rate\n");
+ data_serial.printf("\r3.Set Operation Mode\n");
+ data_serial.printf("\r4.Set Conversion Mode\n");
+ data_serial.printf("\r5.Set Temprature Sensor Mode\n");
+ data_serial.printf("\r6.Set Burn out Current Sources\n");
+ data_serial.printf("\r7.Set Voltage Refernce Selection\n");
+ data_serial.printf("\r8.Set Power Down Configuration\n");
+
+ data = data_serial.getc();
+ data_serial.printf("\n");
+ switch(data)
+ {
+ case '0':
+ data_serial.printf("\rEnter the value to set Input Multiplexer Configuration\n");
+ data_serial.printf("\r0: AINP = AIN0, AINN = AIN1 \n");
+ data_serial.printf("\r1: AINP = AIN0, AINN = AIN2 \n");
+ data_serial.printf("\r2: AINP = AIN0, AINN = AIN3 \n");
+ data_serial.printf("\r3: AINP = AIN1, AINN = AIN2 \n");
+ data_serial.printf("\r4: AINP = AIN1, AINN = AIN3 \n");
+ data_serial.printf("\r5: AINP = AIN2, AINN = AIN3 \n");
+ data_serial.printf("\r6: AINP = AIN1, AINN = AIN0 \n");
+ data_serial.printf("\r7: AINP = AIN3, AINN = AIN2 \n");
+ data_serial.printf("\r8: AINP = AIN0, AINN = AVSS \n");
+ data_serial.printf("\r9: AINP = AIN1, AINN = AVSS \n");
+ data_serial.printf("\rs.Exit\n");
+
+ Set_Disp_Mux_config();
+ break;
+ case '1':
+ data_serial.printf("\rEnter the value to set Gain\n");
+ data_serial.printf("\r0: Gain = 1 \n");
+ data_serial.printf("\r1: Gain = 2 \n");
+ data_serial.printf("\r2: Gain = 4 \n");
+ data_serial.printf("\r3: Gain = 8 \n");
+ data_serial.printf("\r4: Gain = 16 \n");
+ data_serial.printf("\r5: Gain = 32 \n");
+ data_serial.printf("\r6: Gain = 64 \n");
+ data_serial.printf("\r7: Gain = 128 \n");
+ data_serial.printf("\rs.Exit\n");
+
+ Set_Disp_Gain_config();
+ break;
+ case '2':
+ data_serial.printf("\rEnter the value to set Bypass\n");
+ data_serial.printf("\r0: PGA Enabled\n");
+ data_serial.printf("\r1: PGA Disabled\n");
+ data_serial.printf("\rs.Exit\n");
+
+ Set_Disp_Bypass_config();
+ break;
+
+ default:
+ break;
+ }
+
+}
+
+
+
+
+void ext_int_DRDY(void)
+{
+ New_data_avialable = 1;
+}