Write a program in C for a analogtodigital converter pin ADC

Write a program in C for a analog-to-digital converter pin (ADC).

Solution

#include #include #include #ifdef __GNUC__ // For PDQ line platforms, the driver is enabled by simply including // the header file below. #include #else // For the QED/Q line platform, we include the kernel extension manager // generated library.c. We assume that it is present in this directory. #include \"library.h\" #include \"library.c\" #endif // __GNU__ // ******************* DEMONSTRATION PROGRAM *************************** // This demonstration requires that you wire pins 14 and 18 together. They can // also be connected with a low value resistor. // This program outputs 8 voltages and then reads them back. For each measurement // the error is calculated in bits. At the end the average error is printed. // NOTE: YOU MUST MAKE SURE THAT THIS CONSTANT MATCHES YOUR HARDWARE JUMPERS!! #define WAIM_MODULE_NUM 0 // Make sure jumpers J1 and J2 are removed!!! #define min(a,b) ((a)>(b)?(b):(a)) void set_channel6( int value ) { To_DAC12( value, DAC12_CH6, WAIM_MODULE_NUM); } unsigned int read_channel0( void ) { return AD16_Sample( AD16_CH0, WAIM_MODULE_NUM ); } int main ( void ) { int i; unsigned output_counts, input_counts; float output_voltage, input_voltage, error, bits_error; printf(\"\ \ Welcome to the Analog I/O Wildcard demo!\ \"); printf(\"This demo requires pins 14 and 18 to be connected\ \"); printf(\"Press any key to start...\ \"); Key(); printf(\"\ \"); // Init DAC to use 2.048 int ref. This must be done before any outputs are made Init_Analog_IO(INT_2V_DAC12,WAIM_MODULE_NUM); // Set to 0. This variable is added to in the for loop bits_error = 0; for(i = 1; i < 9; i++ ) { // we use min to insure we stay within the bounds of the DAC output_counts = min( 4095, 512*i ); // output voltage to dac channel 6 set_channel6( output_counts ); // wait one millisecond MicrosecDelay( 1000 ); // read the voltage from channel 0 input_counts = read_channel0(); // calcualte float values in Volts output_voltage = 2.048*(output_counts/2048.0); input_voltage = ( input_counts / 65536.0 ) * 4.096; // calculate error error = fabs(output_voltage-input_voltage); // the error in bits is: the error divided by the value of one bit bits_error += error / 0.001; printf(\"Output %2.3f volts. Read back %2.4f volts.\ \", output_voltage, input_voltage); } bits_error = bits_error / 8; printf(\"Over 8 measurements there was an average absolute error of %1.1f bits.\ \", bits_error); return 0; }