00001 /* 00002 * finger sensors control 00003 * 00004 * (c) 2007 by Matthias Arndt <matthias.arndt@tu-clausthal.de> 00005 * 00006 * Matrix enable: P1.6 P1.7 00007 * analogue outputs: P1.1 P1.2 00008 * 00009 * indices of readings: 00010 * 0 ... finger lower sensor 00011 * 1 ... finger upper sensor 00012 * 2 ... right finger top 00013 * 3 ... left finger top (Sharp equipped finger) 00014 */ 00016 #include "t89c51cc02.h" 00017 #include "datatypes.h" 00018 #include "fingersensors.h" 00019 #include "adc.h" 00020 00026 WORD idata fingersensors[FINGERSENSORS_NR]; 00027 00033 void Fingersensors_init() 00034 { 00035 BYTE i; 00036 for(i=0;i<FINGERSENSORS_NR;i++) 00037 fingersensors[i]=0; 00038 00039 ADCF |= 0x06; /* activate P1.1 and P1.2 as analogue inputs */ 00040 00041 Fingersensors_PowerOff(); 00042 } 00043 00049 void Fingersensors_read() 00050 { 00051 Fingersensors_SelectBank1(); /* activate one column of the control matrix */ 00052 _asm 00053 nop 00054 nop 00055 nop 00056 nop 00057 _endasm; 00058 00059 fingersensors[0]=ADC(1); /* read finger sensor 1 */ 00060 _asm 00061 nop 00062 nop 00063 nop 00064 nop 00065 _endasm; 00066 fingersensors[1]=ADC(2); /* read finger sensor 2 */ 00067 _asm 00068 nop 00069 nop 00070 nop 00071 nop 00072 _endasm; 00073 Fingersensors_SelectBank2(); /* activate other column */ 00074 _asm 00075 nop 00076 nop 00077 nop 00078 nop 00079 _endasm; 00080 fingersensors[2]=ADC(1); /* read finger sensor 3 */ 00081 _asm 00082 nop 00083 nop 00084 nop 00085 nop 00086 _endasm; 00087 fingersensors[3]=ADC(2); /* read finger sensor 4 */ 00088 _asm 00089 nop 00090 nop 00091 nop 00092 nop 00093 _endasm; 00094 Fingersensors_PowerOff(); 00095 }
1.4.6