Test application for simplified access to the Microchip 1/4/8-Channels 12-Bit A/D Converters with SPI Serial Interface library
Dependencies: DebugLibrary MCP320x_SPI MCP4xxxx_SPI mbed
Here is the schematic used to validate both libraries MCP320x_SPI and MCP4xxx_SPI.
main.cpp
- Committer:
- Yann
- Date:
- 2013-06-06
- Revision:
- 2:50b3bd9af686
- Parent:
- 0:284a85288653
File content as of revision 2:50b3bd9af686:
#include <string> #include <iostream> #include <iomanip> #include "MCP4xxxx_SPI.h" // Use SPI module #1 and /CS mapped on pin 8 #include "MCP320x_SPI.h" // Use SPI module #1 and /CS mapped on pin 9 struct UserChoice { char choice; unsigned char potId; unsigned char adcId; CMCP4xxxx_SPI::Mcp4xxxFamilly familly; bool isShutdown; }; /* * Declare functions */ void AvailableIndicator(); // LED1 flashing for program while program is alive void DisplayMenuAndGetChoice(); // Display and get the user choice /* * Declare statics */ DigitalOut g_availableLed(LED1); // To verify if program in running Ticker g_available; // LED1 will flash with a period of 2s CMCP4xxxx_SPI g_digitalPot(p5, p6, p7); CMCP320x_SPI *g_adc = NULL; DigitalOut g_cs3201(p9); // /CS mapped on pin 8 for MCP3201 DigitalOut g_cs3208(p10); // /CS mapped on pin 10 for MCP3208 DigitalOut g_cs42100(p8); // /CS mapped on pin 8 for MCP421pp DigitalOut g_cs41050(p11); // /CS mapped on pin 11 for MCP41050 DigitalOut g_cs4152(p13); // /CS mapped on pin 13 for MCP4152 DigitalOut g_cs4251(p14); // /CS mapped on pin 14 for MCP4251 DigitalOut g_shdn4251(p15); // /SHDN mapped on pin 15 for MCP4251 DigitalOut g_wp4251(p16); // /WP mapped on pin 16 for MCP4251 DigitalOut *g_csCurrentAdc = NULL; static UserChoice g_userChoice; // Used to store user choice from displayed menu int main() { g_userChoice.familly = CMCP4xxxx_SPI::_41xxx; // Default value used by the constructor g_userChoice.isShutdown = false; // Deactivate all SPI devices g_cs3201 = 1; g_cs3208 = 1; g_cs42100 = 1; g_cs41050 = 1; g_cs4152= 1; g_cs4251 = 1; g_shdn4251 = 1; // Active at low level g_wp4251 = 1; unsigned char potLevel = 0x80; // Initial digital potentiometer value // Launch available indicator g_available.attach(&AvailableIndicator, 2.0); while (true) { // Retrieve user choices DisplayMenuAndGetChoice(); // Set the pot. value // 1. Enable de right digipot switch (g_userChoice.potId) { case 'a': g_userChoice.familly = CMCP4xxxx_SPI::_42xxx; g_digitalPot.SetFamilly(g_userChoice.familly); g_cs42100 = 0; break; case 'b': g_userChoice.familly = CMCP4xxxx_SPI::_41xxx; g_digitalPot.SetFamilly(g_userChoice.familly); g_cs41050 = 0; break; case 'c': g_userChoice.familly = CMCP4xxxx_SPI::_42xx; g_digitalPot.SetFamilly(g_userChoice.familly); g_digitalPot.ReadRegister(CMCP4xxxx_SPI::Status); g_cs4251 = 0; break; default: g_userChoice.familly = CMCP4xxxx_SPI::_41xx; g_digitalPot.SetFamilly(g_userChoice.familly); g_digitalPot.ReadRegister(CMCP4xxxx_SPI::Status); g_cs4152 = 0; break; } // End of 'switch' statement // 2. Apply user action switch (g_userChoice.choice) { case 'a': potLevel += 1; g_digitalPot.Write(CMCP4xxxx_SPI::WriteToDigiPot1, potLevel); break; case 'b': potLevel -= 1; g_digitalPot.Write(CMCP4xxxx_SPI::WriteToDigiPot1, potLevel); break; case 'c': g_userChoice.isShutdown = !g_userChoice.isShutdown; g_digitalPot.Shutdown(CMCP4xxxx_SPI::ShutdownDigiPot1, g_userChoice.isShutdown); break; case 'd': potLevel = 0x80; break; default: std::cout << "Invalid user choice\r" << std::endl; break; } // End of 'switch' statement // 3. Disable de right digipot switch (g_userChoice.potId) { case 'a': g_cs42100 = 1; break; case 'b': g_cs41050 = 1; break; case 'c': g_cs4251 = 1; break; default: g_cs4152 = 1; break; } // End of 'switch' statement // Set adc to use switch (g_userChoice.adcId) { case 'a': // MCP3201 g_adc = new CMCP320x_SPI(p5, p6, p7); g_csCurrentAdc = &g_cs3201; break; case 'b': // MCP3208 g_adc = new CMCP320x_SPI(p5, p6, p7, NC, CMCP320x_SPI::_3208); g_csCurrentAdc = &g_cs3208; break; } // End of 'switch' statement g_csCurrentAdc->write(0); float sample = g_adc->Read(CMCP320x_SPI::CH2); g_csCurrentAdc->write(1); std::cout << "Voltage at PW0/41050: " << setprecision(5) << sample << "\r" << std::endl; g_csCurrentAdc->write(0); sample = g_adc->Read(CMCP320x_SPI::CH3); g_csCurrentAdc->write(1); std::cout << "Voltage at PW0/4152: " << setprecision(5) << sample << "\r" << std::endl; g_csCurrentAdc->write(0); sample = g_adc->Read(CMCP320x_SPI::CH4); g_csCurrentAdc->write(1); std::cout << "Voltage at PW0/4251#1: " << setprecision(5) << sample << "\r" << std::endl; g_csCurrentAdc->write(0); sample = g_adc->Read(CMCP320x_SPI::CH5); g_csCurrentAdc->write(1); std::cout << "Voltage at PW0/4251#2: " << setprecision(5) << sample << "\r" << std::endl; // Remove instance delete g_adc; g_csCurrentAdc = NULL; } // End of 'while' statement } // End of program - nerver reached void AvailableIndicator() { g_availableLed = !g_availableLed; } // End of AvailableIndicator void DisplayMenuAndGetChoice() { // Display the title std::cout << "\r" << std::endl << "MCP320x_SPI v0.3\r" << std::endl; // Display the pot selection menu std::cout << "\tUse pot 42100:\t\t\ta\r" << std::endl; std::cout << "\tUse pot 41050:\t\t\tb\r" << std::endl; std::cout << "\tUse pot 4251:\t\t\tc\r" << std::endl; std::cout << "Enter your choice: " << std::flush; g_userChoice.potId = getchar(); std::cout << "\r" << std::endl << std::flush; // Display the adc selection menu std::cout << "\tUse adc 3201:\t\t\ta\r" << std::endl; std::cout << "\tUse adc 3208:\t\t\tb\r" << std::endl; std::cout << "Enter your choice: " << std::flush; g_userChoice.adcId = getchar(); std::cout << "\r" << std::endl << std::flush; // Display the menu std::cout << "\tIncrease level of pot:\t\t\ta\r" << std::endl; std::cout << "\tDecrease level of pot:\t\t\tb\r" << std::endl; std::cout << "\tShutdown pot :\t\t\tc\r" << std::endl; std::cout << "\tReset pot :\t\t\td\r" << std::endl; std::cout << "Enter your choice: " << std::flush; g_userChoice.choice = getchar(); std::cout << "\r" << std::endl << std::flush; }