Maxim Integrated
Simple demo for exercising the board
Dependencies: MAX11300 MAX4822 OneWire Terminal ds3231 mbed
Diff: main.cpp
- Revision:
- 8:8e36fe48b351
- Parent:
- 6:18a831a757b5
- Child:
- 9:a5fd406b24a6
--- a/main.cpp Fri Aug 12 18:44:39 2016 +0000
+++ b/main.cpp Mon Aug 22 23:10:57 2016 +0000
@@ -44,10 +44,9 @@
void get_time_date(Terminal & term, Ds3231 & rtc);
void search_ow_bus(Terminal & term, DS2484 & owm);
void print_rom_id(Terminal & term, RomId & romId);
-void calibrate_420_io(Terminal & term, MAX11300 & pixi,
-float & slope_out, float & offset_out,
-float & slope_in, float & offset_in);
+bool calibrate_420_io(Terminal & term, MAX11300 & pixi, DS2484 & owm, uint16_t *calData, bool loopAlreadyCal);
void DS1920Menu(Terminal & term, const RomId & romId, MultidropRomIterator & selector);
+bool check_420_cal(Terminal & term, DS2484 & owm, uint16_t *calData);
int main(void)
{
@@ -95,17 +94,30 @@
}
term.printf("OneWire master initialized\n\n");
+ float aio_slope = 0;
+ float aio_offset = 0;
+ float aii_slope = 0;
+ float aii_offset = 0;
+ uint16_t calData[4];
+
+ bool currentLoopCal = false;
+ if(check_420_cal(term, owm, calData))
+ {
+ aio_slope = (((calData[1]*1.0) - (calData[0]*1.0))/16.0);
+ aio_offset = ((-1.0*aio_slope*4.0) + calData[0]);
+
+ aii_slope = (16.0/((calData[3]*1.0) - (calData[2]*1.0)));
+ aii_offset = ((-1.0*aii_slope*calData[2]) + 4.0);
+
+ currentLoopCal = true;
+ }
+
int32_t user_entry = 0;
int32_t relay = 0;
uint16_t analog_out_ch, analog_val;
float avo_volts, aio_mA, aii_mA;
- float aio_slope = 130.0;
- float aio_offset = -2.0;
- float aii_slope = 7.71e-3;
- float aii_offset = 3.86e-3;
-
const int32_t QUIT = 15;
MAX11300::CmdResult pixi_result;
@@ -214,31 +226,56 @@
break;
case 11:
- aio_mA = term.get_float("Please enter a current from 4.0 to 20.0 mA: ", 3.9, 20.1);
- analog_val = static_cast<uint16_t>((aio_slope * aio_mA) + aio_offset);
-
- pixi_result = pixi.single_ended_dac_write(MAX11300::PORT8, analog_val);
- if(pixi_result != MAX11300::Success)
+ if(currentLoopCal)
{
- term.printf("Failed to set 4-20 out\n");
+ aio_mA = term.get_float("Please enter a current from 4.0 to 20.0 mA: ", 3.9, 20.1);
+ analog_val = static_cast<uint16_t>((aio_slope * aio_mA) + aio_offset);
+
+ pixi_result = pixi.single_ended_dac_write(MAX11300::PORT8, analog_val);
+ if(pixi_result != MAX11300::Success)
+ {
+ term.printf("Failed to set 4-20 out\n");
+ }
+ }
+ else
+ {
+ term.printf("Please calibrate 4-20mA loop first, option 13.\n");
}
break;
case 12:
- pixi_result = pixi.single_ended_adc_read(MAX11300::PORT12, analog_val);
- aii_mA = ((aii_slope*analog_val) + aii_offset);
- if(pixi_result == MAX11300::Success)
+ if(currentLoopCal)
{
- term.printf("4-20 in = %.2fmA\n", aii_mA);
+ pixi_result = pixi.single_ended_adc_read(MAX11300::PORT12, analog_val);
+ aii_mA = ((aii_slope*analog_val) + aii_offset);
+ if(pixi_result == MAX11300::Success)
+ {
+ term.printf("4-20 in = %.2fmA\n", aii_mA);
+ }
+ else
+ {
+ term.printf("Failed to read 4-20 in\n");
+ }
}
else
{
- term.printf("Failed to read 4-20 in\n");
+ term.printf("Please calibrate 4-20mA loop first, option 13.\n");
}
break;
case 13:
- calibrate_420_io(term, pixi, aio_slope, aio_offset, aii_slope, aii_offset);
+ if(calibrate_420_io(term, pixi, owm, calData, currentLoopCal))
+ {
+ aio_slope = (((calData[1]*1.0) - (calData[0]*1.0))/16.0);
+ aio_offset = ((-1.0*aio_slope*4.0) + calData[0]);
+
+ aii_slope = (16.0/((calData[3]*1.0) - (calData[2]*1.0)));
+ aii_offset = ((-1.0*aii_slope*calData[2]) + 4.0);
+
+ currentLoopCal = true;
+
+ term.printf("Calibration data saved to 1-Wire EEPROM\n");
+ }
break;
case (QUIT - 1):
@@ -381,14 +418,18 @@
}
//*********************************************************************
-void calibrate_420_io(Terminal & term, MAX11300 & pixi,
-float & slope_out, float & offset_out,
-float & slope_in, float & offset_in)
+bool calibrate_420_io(Terminal & term, MAX11300 & pixi, DS2484 & owm, uint16_t *calData, bool loopAlreadyCal)
{
char user_entry;
//initial vals for aio determined imperically on one pcb
static uint16_t aio_4mA = 518;
static uint16_t aio_20mA = 2592;
+
+ if(loopAlreadyCal)
+ {
+ aio_4mA = calData[0];
+ aio_20mA = calData[1];
+ }
uint16_t aii_4mA, aii_20mA;
term.cls();
@@ -448,8 +489,8 @@
}
while(user_entry != 'q');
- slope_out = (((aio_20mA*1.0) - (aio_4mA*1.0))/16.0);
- offset_out = ((-1.0*slope_out*4.0) + aio_4mA);
+ calData[0] = aio_4mA;
+ calData[1] = aio_20mA;
uint8_t idx;
//cal aii
@@ -461,6 +502,8 @@
}
pixi.single_ended_adc_read(MAX11300::PORT12, aii_4mA);
+ calData[2] = aii_4mA;
+
pixi.single_ended_dac_write(MAX11300::PORT8, aio_20mA);
for(idx = 0; idx < 10; idx++)
{
@@ -469,12 +512,57 @@
}
pixi.single_ended_adc_read(MAX11300::PORT12, aii_20mA);
+ calData[3] = aii_20mA;
- slope_in = (16.0/((aii_20mA*1.0) - (aii_4mA*1.0)));
- offset_in = ((-1.0*slope_in*aii_4mA) + 4.0);
+
+ bool rtn_val = false;
+
+ //Write cal data to eeprom
+ OneWireMaster::CmdResult result = owm.OWReset();
+ MultidropRomIterator selector(owm);
+ SearchState search_state;
+
+ DS2431 eeprom(selector);
- term.printf("\nCal done.\n\n");
- wait(1.0);
+ search_state.findFamily(0x2D);
+ result = OWNext(owm, search_state);
+ if(result == OneWireMaster::Success)
+ {
+ eeprom.setRomId(search_state.romId);
+
+ OneWireSlave::CmdResult slaveResult = eeprom.writeMemory(0, "CalTrue!", 8);
+ if(slaveResult == OneWireSlave::Success)
+ {
+ uint8_t writeCalData[8];
+ //cal data stored MSB first;
+ writeCalData[0] = ((aio_4mA >> 8) & 0xFF);
+ writeCalData[1] = (aio_4mA & 0xFF);
+ writeCalData[2] = ((aio_20mA >> 8) & 0xFF);
+ writeCalData[3] = (aio_20mA & 0xFF);
+ writeCalData[4] = ((aii_4mA >> 8) & 0xFF);
+ writeCalData[5] = (aii_4mA & 0xFF);
+ writeCalData[6] = ((aii_20mA >> 8) & 0xFF);
+ writeCalData[7] = (aii_20mA & 0xFF);
+
+ slaveResult = eeprom.writeMemory(8, writeCalData, 8);
+ if(slaveResult == OneWireSlave::Success)
+ {
+ rtn_val = true;
+ term.printf("\nCal done.\n\n");
+ wait(1.0);
+ }
+ else
+ {
+ term.printf("Failed to write cal data.\n\n");
+ }
+ }
+ else
+ {
+ term.printf("Failed to write cal message.\n\n");
+ }
+ }
+
+ return rtn_val;
}
//*********************************************************************
@@ -606,3 +694,59 @@
}
}
}
+
+//*********************************************************************
+bool check_420_cal(Terminal & term, DS2484 & owm, uint16_t *calData)
+{
+ OneWireMaster::CmdResult result = owm.OWReset();
+ MultidropRomIterator selector(owm);
+ SearchState search_state;
+
+ DS2431 eeprom(selector);
+
+ bool rtn_val = false;
+
+ term.printf("\n\nPlease remove any 1-Wire devices connected to bus on start up and calibrartion of 4-20mA loop.\n\n");
+ wait(2.5);
+
+ search_state.findFamily(0x2D);
+ result = OWNext(owm, search_state);
+ if(result == OneWireMaster::Success)
+ {
+ eeprom.setRomId(search_state.romId);
+ uint8_t temp_data[8];
+
+ OneWireSlave::CmdResult slaveResult = eeprom.readMemory(0, temp_data, 8);
+
+ if((temp_data[0] == 'C') && (slaveResult == OneWireSlave::Success))
+ {
+ slaveResult = eeprom.readMemory(8, temp_data, 8);
+ if(slaveResult == OneWireSlave::Success)
+ {
+ calData[0] = ((temp_data[0] << 8) | temp_data[1]);
+ calData[1] = ((temp_data[2] << 8) | temp_data[3]);
+ calData[2] = ((temp_data[4] << 8) | temp_data[5]);
+ calData[3] = ((temp_data[6] << 8) | temp_data[7]);
+
+ rtn_val = true;
+ }
+ else
+ {
+ term.printf("Failed to read row 1 of EEPROM\n\n");
+ }
+ }
+ else
+ {
+ if(slaveResult == OneWireSlave::Success)
+ {
+ term.printf("No cal data stored, please calibrate 4-20mA loop\n\n");
+ }
+ else
+ {
+ term.printf("Failed to read row 0 of EEPROM\n\n");
+ }
+ }
+ }
+
+ return rtn_val;
+}