kouzi osaki / SoftMCP4922

data type bugfix

Fork of SoftMCP4922 by magne tone

SoftMCP4922.cpp@2:79d0ecc7375b, 2013-10-31 (annotated)

Committer:
doctorura
Date:
Thu Oct 31 15:07:08 2013 +0000
Revision:
2:79d0ecc7375b
Parent:
1:1f8a7ae7dc8b
Child:
3:060c219353b8
Vref added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
magnetone 0:aeca3abe0194 1 /*
magnetone 0:aeca3abe0194 2 * MCP4922 (Soft SPI) Library
magnetone 0:aeca3abe0194 3 * 2013 Magnetone
magnetone 0:aeca3abe0194 4 */
magnetone 0:aeca3abe0194 5
magnetone 0:aeca3abe0194 6 #include "SoftMCP4922.h"
magnetone 0:aeca3abe0194 7
magnetone 0:aeca3abe0194 8 SoftMCP4922::SoftMCP4922( PinName sck, PinName sdi, PinName cs, PinName ldac, PinName shdn, int ch):
magnetone 0:aeca3abe0194 9 m_sck( sck ),
magnetone 0:aeca3abe0194 10 m_sdi( sdi ),
magnetone 0:aeca3abe0194 11 m_cs( cs ),
magnetone 0:aeca3abe0194 12 m_ldac( ldac ),
magnetone 0:aeca3abe0194 13 m_shdn( shdn ),
magnetone 0:aeca3abe0194 14 m_ch( ch )
magnetone 0:aeca3abe0194 15 {
magnetone 0:aeca3abe0194 16
magnetone 0:aeca3abe0194 17 m_shdn = 1; // non shutdown
magnetone 0:aeca3abe0194 18 m_sck = 0; // init
magnetone 0:aeca3abe0194 19
magnetone 0:aeca3abe0194 20 // out vcc/2
magnetone 0:aeca3abe0194 21 write_u12( 2048 );
magnetone 0:aeca3abe0194 22
magnetone 0:aeca3abe0194 23 }
magnetone 0:aeca3abe0194 24
magnetone 0:aeca3abe0194 25 void SoftMCP4922::write_u16( unsigned short value )
magnetone 0:aeca3abe0194 26 {
magnetone 0:aeca3abe0194 27 dacControl( value >> 4 );
magnetone 0:aeca3abe0194 28 }
magnetone 0:aeca3abe0194 29
magnetone 0:aeca3abe0194 30 void SoftMCP4922::write_u12( unsigned short value )
magnetone 0:aeca3abe0194 31 {
magnetone 0:aeca3abe0194 32 dacControl( value );
magnetone 0:aeca3abe0194 33 }
magnetone 0:aeca3abe0194 34
magnetone 0:aeca3abe0194 35 void SoftMCP4922::write_u10( unsigned short value )
magnetone 0:aeca3abe0194 36 {
magnetone 0:aeca3abe0194 37 dacControl( value << 2 );
magnetone 0:aeca3abe0194 38 }
magnetone 0:aeca3abe0194 39
doctorura 1:1f8a7ae7dc8b 40 void SoftMCP4922::write_u8( unsigned short value )
magnetone 0:aeca3abe0194 41 {
magnetone 0:aeca3abe0194 42 dacControl( value << 4 );
magnetone 0:aeca3abe0194 43 }
magnetone 0:aeca3abe0194 44
magnetone 0:aeca3abe0194 45 // DAC control function
doctorura 1:1f8a7ae7dc8b 46 void SoftMCP4922::dacControl( unsigned short value )
magnetone 0:aeca3abe0194 47 {
magnetone 0:aeca3abe0194 48 int i ;
magnetone 0:aeca3abe0194 49
magnetone 0:aeca3abe0194 50 // dac setting start
magnetone 0:aeca3abe0194 51 m_cs = 0;
magnetone 0:aeca3abe0194 52 m_ldac = 1;
magnetone 0:aeca3abe0194 53
magnetone 0:aeca3abe0194 54 // channel select
magnetone 0:aeca3abe0194 55 if( m_ch == 0 ){
magnetone 0:aeca3abe0194 56 m_sdi = 0;
magnetone 0:aeca3abe0194 57 }else{
magnetone 0:aeca3abe0194 58 m_sdi = 1;
magnetone 0:aeca3abe0194 59 }
magnetone 0:aeca3abe0194 60 m_sck = 1;
magnetone 0:aeca3abe0194 61 m_sck = 0;
magnetone 0:aeca3abe0194 62
doctorura 2:79d0ecc7375b 63 // vref buffer on
doctorura 2:79d0ecc7375b 64 m_sdi = 1;
magnetone 0:aeca3abe0194 65 m_sck = 1;
magnetone 0:aeca3abe0194 66 m_sck = 0;
magnetone 0:aeca3abe0194 67
magnetone 0:aeca3abe0194 68 // output gain = 1
magnetone 0:aeca3abe0194 69 m_sdi = 1;
magnetone 0:aeca3abe0194 70 m_sck = 1;
magnetone 0:aeca3abe0194 71 m_sck = 0;
magnetone 0:aeca3abe0194 72
magnetone 0:aeca3abe0194 73 // analog output enable
magnetone 0:aeca3abe0194 74 m_sdi = 1;
magnetone 0:aeca3abe0194 75 m_sck = 1;
magnetone 0:aeca3abe0194 76 m_sck = 0;
magnetone 0:aeca3abe0194 77
magnetone 0:aeca3abe0194 78 // DAC data out
doctorura 2:79d0ecc7375b 79 for( i=11 ; i>=0 ; i-- ){
doctorura 2:79d0ecc7375b 80 if( ( ( value >> i ) & 0x1 ) == 1 )
magnetone 0:aeca3abe0194 81 m_sdi = 1;
magnetone 0:aeca3abe0194 82 else
magnetone 0:aeca3abe0194 83 m_sdi = 0;
magnetone 0:aeca3abe0194 84 m_sck = 1;
magnetone 0:aeca3abe0194 85 m_sck = 0;
magnetone 0:aeca3abe0194 86 }
magnetone 0:aeca3abe0194 87
magnetone 0:aeca3abe0194 88 // analog out
magnetone 0:aeca3abe0194 89 m_cs = 1;
magnetone 0:aeca3abe0194 90 m_ldac = 0;
magnetone 0:aeca3abe0194 91
magnetone 0:aeca3abe0194 92 }
magnetone 0:aeca3abe0194 93