Yann Garcia
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.
Revision 2:50b3bd9af686, committed 2013-06-06
- Comitter:
- Yann
- Date:
- Thu Jun 06 07:59:33 2013 +0000
- Parent:
- 1:643f3b45afd1
- Commit message:
- Validate support of _42xx familly
Changed in this revision
--- a/MCP320x_SPI.lib Fri Apr 05 13:43:23 2013 +0000 +++ b/MCP320x_SPI.lib Thu Jun 06 07:59:33 2013 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/Yann/code/MCP320x_SPI/#17cee87e4563 +http://mbed.org/users/Yann/code/MCP320x_SPI/#f0a81abeaef5
--- a/MCP4xxxx_SPI.lib Fri Apr 05 13:43:23 2013 +0000 +++ b/MCP4xxxx_SPI.lib Thu Jun 06 07:59:33 2013 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/Yann/code/MCP4xxxx_SPI/#4f6133144e7e +http://mbed.org/users/Yann/code/MCP4xxxx_SPI/#ded0d8a6729c
--- a/main.cpp Fri Apr 05 13:43:23 2013 +0000
+++ b/main.cpp Thu Jun 06 07:59:33 2013 +0000
@@ -9,13 +9,15 @@
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
-UserChoice DisplayMenuAndGetChoice(); // Display and get the user choice
+void DisplayMenuAndGetChoice(); // Display and get the user choice
/*
* Declare statics
@@ -28,16 +30,29 @@
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_csCurrentAdc = NULL;
-UserChoice g_userChoice; // Used to store user choice from displayed menu
+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
@@ -46,36 +61,51 @@
while (true) {
// Retrieve user choices
- g_userChoice = DisplayMenuAndGetChoice();
+ 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_cs41050 = 0;
+ 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::WriteToPot1, potLevel);
+ g_digitalPot.Write(CMCP4xxxx_SPI::WriteToDigiPot1, potLevel);
break;
case 'b':
potLevel -= 1;
- g_digitalPot.Write(CMCP4xxxx_SPI::WriteToPot1, potLevel);
+ g_digitalPot.Write(CMCP4xxxx_SPI::WriteToDigiPot1, potLevel);
break;
case 'c':
- potLevel -= 1;
- g_digitalPot.Write(CMCP4xxxx_SPI::ShutdownPot1);
+ g_userChoice.isShutdown = !g_userChoice.isShutdown;
+ g_digitalPot.Shutdown(CMCP4xxxx_SPI::ShutdownDigiPot1, g_userChoice.isShutdown);
break;
case 'd':
- //g_digitalPot->Reset();
potLevel = 0x80;
break;
- default:
+ default:
std::cout << "Invalid user choice\r" << std::endl;
break;
} // End of 'switch' statement
@@ -84,8 +114,14 @@
case 'a':
g_cs42100 = 1;
break;
+ case 'b':
+ g_cs41050 = 1;
+ break;
+ case 'c':
+ g_cs4251 = 1;
+ break;
default:
- g_cs41050 = 1;
+ g_cs4152 = 1;
break;
} // End of 'switch' statement
@@ -101,9 +137,25 @@
break;
} // End of 'switch' statement
g_csCurrentAdc->write(0);
- float sample = g_adc->Read(CMCP320x_SPI::CH3);
+ 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: " << setprecision(5) << sample << "\r" << std::endl;
+ 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
@@ -113,24 +165,23 @@
g_availableLed = !g_availableLed;
} // End of AvailableIndicator
-UserChoice DisplayMenuAndGetChoice() {
- static UserChoice userChoice;
-
+void DisplayMenuAndGetChoice() {
// Display the title
- std::cout << "\r" << std::endl << "MCP320x_SPI v0.2\r" << std::endl;
+ std::cout << "\r" << std::endl << "MCP320x_SPI v0.3\r" << std::endl;
// Display the pot selection menu
- std::cout << "\tUse pot #1:\t\t\ta\r" << std::endl;
- std::cout << "\tUse pot #2:\t\t\tb\r" << std::endl;
+ 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;
- userChoice.potId = getchar();
+ 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;
- userChoice.adcId = getchar();
+ g_userChoice.adcId = getchar();
std::cout << "\r" << std::endl << std::flush;
// Display the menu
@@ -139,7 +190,6 @@
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;
- userChoice.choice = getchar();
+ g_userChoice.choice = getchar();
std::cout << "\r" << std::endl << std::flush;
- return userChoice;
}