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modified on 18 September 2014 at 16:23 ••• 27,430 views

06-03 KeyPressDisplay

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This program reads a number pressed on the personal computers keyboard while using a terminal program and displays the number on the 7 segment display.
This program reads a number pressed on the personal computers keyboard while using a terminal program and displays the number on the 7 segment display.
 +
The signals used for this example are listed below:
 +
{| border="1" cellpadding="5" cellspacing="2" align="center" style="text-align: center;"
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|+ align="bottom"|'''Signals Used and Connector Locations for Example 06-03'''
 +
|'''Signal'''
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|'''LPC4330 PIN NAME'''
 +
|'''BAM210E'''
 +
|'''BAM210'''
 +
|'''BAM200E'''
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|'''BAM200'''
 +
|'''Used for'''
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|-
 +
|USBTX
 +
|P2_10
 +
|J8-1
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|J8-1
 +
|S4-3
 +
|S4-3
 +
|MBED-HDK Serial RX
 +
|-
 +
|USBRX
 +
|P2_11
 +
|J8-1
 +
|J8-1
 +
|S4-3
 +
|S4-3
 +
|MBED-HDK Serial TX
 +
|-
 +
|D0
 +
|P6_5
 +
|J9-1
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|J9-1
 +
|S2-5
 +
|S2-5
 +
|Ones Segment A
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|-
 +
|D1
 +
|P6_4
 +
|J9-2
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|J9-2
 +
|S2-4
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|S2-4
 +
|Ones Segment B
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|-
 +
|D2
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|P1_7
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|J9-3
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|J9-3
 +
|S3-7
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|S3-7
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|Ones Segment C
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|-
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|D3
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|P4_0
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|J9-3
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|J9-3
 +
|S3-7
 +
|S3-7
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|Ones Segment D
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|-
 +
|D4
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|P6_9
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|J9-4
 +
|J9-4
 +
|S8-7
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|n/p
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|Ones Segment E
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|-
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|D5
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|P5_5
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|J9-5
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|J9-5
 +
|S3-8
 +
|S3-8
 +
|Ones Segment F
 +
|-
 +
|D6
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|P5_7
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|J9-6
 +
|J9-6
 +
|S3-9
 +
|S3-9
 +
|Ones Segment G
 +
|-
 +
|D7
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|P7_6
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|J9-7
 +
|J9-7
 +
|S4-6
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|S4-6
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|Ones Segment DP
 +
|-
 +
|D8
 +
|P6_12
 +
|J10-1
 +
|J10-1
 +
|S10-3
 +
|n/p
 +
|Tens Segment A
 +
|-
 +
|D9
 +
|P5_0
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|J10-2
 +
|J10-2
 +
|S1-4
 +
|S1-4
 +
|Tens Segment B
 +
|-
 +
|D10
 +
|P4_6
 +
|J10-3
 +
|J10-3
 +
|S2-3
 +
|S2-6
 +
|Tens Segment C
 +
|-
 +
|D11
 +
|P4_8
 +
|J10-4
 +
|J10-4
 +
|S2-7
 +
|S2-7
 +
|Tens Segment D
 +
|-
 +
|D12
 +
|P4_9
 +
|J10-5
 +
|J10-5
 +
|S2-8
 +
|S2-8
 +
|Tens Segment E
 +
|-
 +
|D13
 +
|P4_10
 +
|J10-6
 +
|J10-6
 +
|S2-9
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|S2-9
 +
|Tens Segment F
 +
|-
 +
|D16
 +
|P2_3
 +
|J10-9
 +
|J10-9
 +
|S4-8
 +
|S4-8
 +
|Tens Segment G
 +
|-
 +
|D17
 +
|P2_4
 +
|J10-10
 +
|J10-10
 +
|S4-9
 +
|S4-9
 +
|Tens Segment DP
 +
|-
 +
|}
 +
 +
The following schematic can be used to build the circuit with a BAM210E or BAM210.
 +
[[Image:BAM210_06_03_SCH.png|center|alt=BAM210|frame|<div align="center">'''Schematic for example 06-03''']]
 +
 +
<div style="text-align: left;">
  /* Program Example 6.3: Host keypress to 7-seg display
  /* Program Example 6.3: Host keypress to 7-seg display
                                                               */
                                                               */
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  }
  }
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The following image shows the built circuit on a BAM210E.
[[Image:BAM210_KeyPressDisplay.jpeg|center|]]
[[Image:BAM210_KeyPressDisplay.jpeg|center|]]
-
 
-
 
-
[[Image:BAM210_06_03_SCH.png|center|alt=BAM210|frame|<div align="center">'''Schematic for example 06-03''']]
 

Revision as of 19:59, 17 September 2014

This program reads a number pressed on the personal computers keyboard while using a terminal program and displays the number on the 7 segment display.

The signals used for this example are listed below:

Signals Used and Connector Locations for Example 06-03
Signal LPC4330 PIN NAME BAM210E BAM210 BAM200E BAM200 Used for
USBTX P2_10 J8-1 J8-1 S4-3 S4-3 MBED-HDK Serial RX
USBRX P2_11 J8-1 J8-1 S4-3 S4-3 MBED-HDK Serial TX
D0 P6_5 J9-1 J9-1 S2-5 S2-5 Ones Segment A
D1 P6_4 J9-2 J9-2 S2-4 S2-4 Ones Segment B
D2 P1_7 J9-3 J9-3 S3-7 S3-7 Ones Segment C
D3 P4_0 J9-3 J9-3 S3-7 S3-7 Ones Segment D
D4 P6_9 J9-4 J9-4 S8-7 n/p Ones Segment E
D5 P5_5 J9-5 J9-5 S3-8 S3-8 Ones Segment F
D6 P5_7 J9-6 J9-6 S3-9 S3-9 Ones Segment G
D7 P7_6 J9-7 J9-7 S4-6 S4-6 Ones Segment DP
D8 P6_12 J10-1 J10-1 S10-3 n/p Tens Segment A
D9 P5_0 J10-2 J10-2 S1-4 S1-4 Tens Segment B
D10 P4_6 J10-3 J10-3 S2-3 S2-6 Tens Segment C
D11 P4_8 J10-4 J10-4 S2-7 S2-7 Tens Segment D
D12 P4_9 J10-5 J10-5 S2-8 S2-8 Tens Segment E
D13 P4_10 J10-6 J10-6 S2-9 S2-9 Tens Segment F
D16 P2_3 J10-9 J10-9 S4-8 S4-8 Tens Segment G
D17 P2_4 J10-10 J10-10 S4-9 S4-9 Tens Segment DP

The following schematic can be used to build the circuit with a BAM210E or BAM210.

File:BAM210 06 03 SCH.png
Schematic for example 06-03
/* Program Example 6.3: Host keypress to 7-seg display
                                                              */
#include "mbed.h"
Serial pc(USBTX, USBRX);                         // comms to host PC
BusOut Seg1(D0,D1,D2,D3,D4,D5,D6,D7);            // A,B,C,D,E,F,G,DP
BusOut Seg2(D8,D9,D10,D11,D12,D13,D16,D17);      // A,B,C,D,E,F,G,DP

void SegInit(void);                          // function prototype
void HostInit(void);                         // function prototype
char GetKeyInput(void);                      // function prototype
char SegConvert(char SegValue);              // function prototype
char data1, data2;                           // variable declarations

int main() {         // main program
  SegInit();         // call function to initialise the 7-seg displays
  HostInit();        // call function to initialise the host terminal
  while (1) {                 // infinite loop
    data2 = GetKeyInput();    // call function to get 1st key press
    Seg2=SegConvert(data2);   // call function to convert and output
    data1 = GetKeyInput();    // call function to get 2nd key press
    Seg1=SegConvert(data1);   // call function to convert and output
    pc.printf("  ");          // display spaces between numbers
  }
}
// functions
void SegInit(void) {
  Seg1=SegConvert(0);        // initialise to zero
  Seg2=SegConvert(0);        // initialise to zero
}

void HostInit(void) {
  pc.printf("\n\rType two digit numbers to be displayed\n\r");
}

char GetKeyInput(void) {
  char c = pc.getc();      // get keyboard data (ascii 0x30-0x39)
  pc.printf("%c",c);       // print ascii value to host PC terminal
  return (c&0x0F);         // apply bit mask to convert to decimal, and return
}

char SegConvert(char SegValue) {        // function 'SegConvert'
  char SegByte=0x00;
  switch (SegValue) {                   //DP G F E D C B A
    case 0 : SegByte = 0x3F;break;      // 0 0 1 1 1 1 1 1 binary
    case 1 : SegByte = 0x06;break;      // 0 0 0 0 0 1 1 0 binary
    case 2 : SegByte = 0x5B;break;      // 0 1 0 1 1 0 1 1 binary
    case 3 : SegByte = 0x4F;break;      // 0 1 0 0 1 1 1 1 binary
    case 4 : SegByte = 0x66;break;      // 0 1 1 0 0 1 1 0 binary
    case 5 : SegByte = 0x6D;break;      // 0 1 1 0 1 1 0 1 binary
    case 6 : SegByte = 0x7D;break;      // 0 1 1 1 1 1 0 1 binary
    case 7 : SegByte = 0x07;break;      // 0 0 0 0 0 1 1 1 binary
    case 8 : SegByte = 0x7F;break;      // 0 1 1 1 1 1 1 1 binary
    case 9 : SegByte = 0x6F;break;      // 0 1 1 0 1 1 1 1 binary
  }
    return SegByte;
}

The following image shows the built circuit on a BAM210E.

File:BAM210 KeyPressDisplay.jpeg
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