main.c

cypress 的ad采集例程,适用于cy8系列.

//***********************************************************************************************
//***********************************************************************************************
//  FILENAME: main.C
//
//   Version: 1.0, Updated on 27th July 2004
//
//  DESCRIPTION: Main file of Example_ADCINC12_28pin example project
//-----------------------------------------------------------------------------
//  Copyright (c) Cypress MicroSystems 2000-2003. All Rights Reserved.
//*****************************************************************************
//*****************************************************************************

/***********************************************************************************************
Example_ADCINC12_28pin, a CY3210-PSoCEVAL1 and CY3210-MiniEval1 board project

 Project Objective:
To demonstrate the operation of the 12-Bit Incremental Analog-to-Digital Converter user 
module of the PSoC microcontroller.Also this example demonstrates the clock generation 
using a counter and routing.A Programmable Gain Amplifier (PGA) with unity gain, 
a 8-bit counter and a LCD user module are also incorporated.

 Overview:
 The following changes were made to the default settings in the device editor.
 
    Select user modules
        Select an ADCINC12_1 module from the ADCs category
        Select a PGA_1 module from the Amplifiers category
        Select a Counter8_1 module from the Counters category
        Select a LCD_1 from Misc Digital category
        in this example these UMs are renamed as ADCINC12,PGA,Counter8,LCD respectively. 
    
    Place user modules
        1) select ADCINC12, and then select the analog block (digital blocks
               are fine with the default placement) and move it to block ASC10 to place it.
        2) select PGA and move it to block ACB00 to place it
        3) select Counter8 and move it to block DCB03 to place it
        4) Select LCD and select port_2 for LCD port.

Set the global resources and UM resources in the device editor window as shown in the project
settings below.

Upon program execution all hardware settings from the device configuration are loaded 
into the device and main.c is executed.

For this example the 8-bit counter is used to provide a clock for A/D converter. 
this approach provides an example of clock generation and routing.  The clock
output from the counter is used as a source for the Analog Column clocks (AnalogClock_0_Select).
This clock is then selected as the clock input for AnalogColumn_Clock_0, which supplies
it as input to all blocks in that column.This counter clock is also selected as the input to 
the timer and counter components of the ADC(DBB01 and DCB02 respectively) using the row 
broadcast (BC0). The 8-bit counter, DCB03 is set to run at 1.5MHz by the setting 
the counter value to 15.This amounts to dividing the 24MHz(Use SysClk Direct) input clock by 16.
Each time the counter reaches 0 it is automatically reloaded. A compare value
for the counter is set to 7 which sets up a duty cycle at the output of approximately 50%.


The 12-bit ADC is a single user module that consists of 3 PSoC blocks.Each PSoC 
block can be individually placed.Once they are placed each block must be clocked 
with the same clock source.The clock signal to each of the digital sections of the 
ADC can be configured in the user module menu or device editor.  
Analog values are sampled at pin P0[1] at:
Sample Rate = 1.5MHz(counter output)/(65*256)= 90 samples/sec.  
Further information is supplied in the data sheet included for the user module.


Clock Routing.  Using the device editor click on the AnalogClock_0_Select mux icon.  Select 
the block ID of the block containing the 8-bit counter. In this example it is DCB03. Click 
on the clock mux icon associated with the analog column where the ADC analog block is 
placed.  In the example this is the column 0. Select the appropriate source.  For the example 
this is AnalogClock_0_Select.This demonstrates using a digital PSoC block to supply a specific
clock to an analog section of the chip.The ADC timer and counter blocks must have a clock
source specified that is identical to the one just selected on ACLK0 and the analog column.

 Circuit Connections
This example project runs on the CY3210-PSoCEVAL1 and CY3210-MiniEval1 boards or compatible 
hardware.An analog input voltage is required on port_0_1, and varying this voltage will cause 
value in the LCD to change. The voltage must not exceed Vcc by more than 0.5 volts as per the
device specification.A PGA with unity gain is used just to route the analog input to ADC from 
port pin.

The table below shows the translation of input analog voltage to digital for a signed output

DC voltage      Decimal value      Hexadecimal equivalent
 0                -2048                    F800
 1                -1229                    FB33
 2                -410                     FE66
 2.5(AGND)        -1                       FFFF
 3                409                      199
 4                1228                     4CC
 5                2047                     07FF

(while verifying the negative values displayed using calculator,prefix the hexadecimal value 
with F.for example,if the displayed value in the LCD is ECCC,in a 10 digit calculator enter 
FFFFFFECCC and then convert to decimal to get -4916) 

 Project Settings:
    Global resources
        VC1            =    1                // Divide sysclock by 1
        RefMux         =    Vdd/2 +/- Vdd/2  // This sets the ADC to use 2.5 volts for its
                                                zero reference (AGND) and measures signals 
                                                in a range that is 2.5 volts above and below AGND
             
        Analog Power   =    SC on/Ref High  // This turns on the clock to the SC blocks  
                                               and sets the internal references for their best 
                                               performance. The power level can be reduced 
                                               once a project has been successfully developed.
     
    ADCINC12
        CNT Clock      =    Row_0_Broadcast // Clock from conuter 
        TMR Clock      =    Row_0_Broadcast
        Input          =    ACB00           // Route input through PGA
        ClockPhase     =    Normal
        ClockSync      =    Sys to Sync Clock

    AnalogColumn_Clock_0    =    AnalogClock_0_select
    AnalogClock_0_select    =    DCB03      // Select the output of counter
  
    Counter8 
        Clock          =    Disable         // Since Use SysClk Direct is used
        Enable         =    High            // Enable continous count
        Compare Out    =    None
        Terminal Count =    None 
        Period         =    15
        Compare Value  = 7                  // Set to half of the period to get 50% duty cycle 
        Compare Type   =    Less Than or Equal to
        Interrupt Type =    Compare True
        Clock Sync     =    Use SysClk Direct // Provides low-skew access to system clock
        InvertEnable   =    Normal     

    PGA
        Gain           =    1.000                       // Set for unity gain
        Input          =    AnalogColumn_Input_MUX_0    // Input is from column mux
        Reference      =    AGND       
        AnalogBus      =    Disable                     // The output will not go to the analog output bus  

    AnalogColumn_InputMUX_0    =    PORT_0_1
  

    LCD
        LCDPort        =    Port_2
        BarGraph       =    Disable
    
Input:
  
    Pin             Select            Drive
    P0[1]        AnalogInput        High Z analog
      
Output:
   Port[2]-LCd port.For pins Default settings are made when LCD is connected to a port.
   
How to use this with the Proto board:

For input Connect a Variable end of pot(R11) which is terminated at J5 in CY3210-PSoCEVAL1 board to 
port_0_1 through a jumper wire.Connect LCD at J9 for output.

For CY3210-MiniEval1 board variable end of a pot is readily connected to port_0_1.

Note:
For CY3210-MiniEval1 board LCD connections are to be made on the Bread board.The following table 
shows LCD connection for CY3210-MiniEval1 board:(dont forget to connect Vcc and ground to LCD and 
for nominal contrast,ground contrast control pin of LCD through 1.5K resistor)

port pins             LCD Pin 
P2[0]    Connect to   LCD_D4
P2[1]    Connect to   LCD_D5
P2[2]    Connect to   LCD_D6
P2[3]    Connect to   LCD_D7
P2[4]    Connect to   LCD_E
P2[5]    Connect to   LCD_RS 
P2[6]    Connect to   LCD_RW
*/

//----------------------------------------------------------------------------
// 'C' Main line
//-----------------------------------------------------------------------------

//-------------------------------------------------------------------
// Include Files
//-------------------------------------------------------------------
#include "m8c.h"
#include "psocapi.h"

//----------------------------------------------------------------------------

//  FUNCTION NAME: Main
//
//  DESCRIPTION:
//      Main function. Performs system initialization,gets the data for display and loops infinitely.
//      
//----------------------------------------------------------------------------

//
//  ARGUMENTS:        None
//  RETURNS:          Nothing.
//  SIDE EFFECTS:     None.
//
//  THEORY of OPERATION or PROCEDURE:
//    1) Enable Global Interrupt
//    2) Start the user modules
//    3) Gets the data from ADC and displays the same on LCD
//    4) Loop Infinitely

void main()
{
  
 
    Counter8_Start(); 
    // Start PGA with High power
    PGA_Start(PGA_HIGHPOWER);       
    // Initialize LCD  
    LCD_Start();                       
 
    //ADC power level set to highest power.
    ADCINC12_Start(ADCINC12_HIGHPOWER);     
    //The zero argument sets the ADC to sample continuously.
    ADCINC12_GetSamples(0);       
    //Enable global interrupts
    M8C_EnableGInt;          
 
 
  
    for(;;)
        {
        // Wait for data to be ready
        while(ADCINC12_fIsDataAvailable() == 0);   
        // Place LCD cursor at row 0, col 1.
        LCD_Position(0,1);
        // print the hex value to LCD                  
        LCD_PrHexInt(ADCINC12_iGetData());     

        // Clear data ready flag
        ADCINC12_ClearFlag();        
   

  
        }
}