kota sato / MCP320x

This is library for mcp320x. But operation check is not finished only "mcp3204".

Dependents:   Nucleo_mcp3204test

MCP320x.cpp@2:d2c51376ee7c, 2016-01-29 (annotated)

Committer:
SK_ROBO_
Date:
Fri Jan 29 03:01:37 2016 +0000
Revision:
2:d2c51376ee7c
Parent:
1:66fdf46dc4de 
deleted DEBUGlibrary.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
SK_ROBO_ 0:775667bb8069 1 #include "MCP320x.h"
SK_ROBO_ 0:775667bb8069 2
SK_ROBO_ 0:775667bb8069 3 namespace MCP320x_SPI {
SK_ROBO_ 0:775667bb8069 4
SK_ROBO_ 0:775667bb8069 5 unsigned char CMCP320x_SPI::SPIModuleRefCounter = 0;
SK_ROBO_ 0:775667bb8069 6
SK_ROBO_ 0:775667bb8069 7 CMCP320x_SPI::CMCP320x_SPI(const PinName p_mosi, const PinName p_miso, const PinName p_sclk, const PinName p_cs, const Mcp320xFamilly p_familly, const unsigned int p_frequency) : _internalId("") {
SK_ROBO_ 0:775667bb8069 8 CMCP320x_SPI::SPIModuleRefCounter += 1;
SK_ROBO_ 0:775667bb8069 9 if (CMCP320x_SPI::SPIModuleRefCounter > 1) {
SK_ROBO_ 0:775667bb8069 10 //FIXME Check that SPI settings are identical. Otherwise it should failed
SK_ROBO_ 0:775667bb8069 11 return;
SK_ROBO_ 0:775667bb8069 12 }
SK_ROBO_ 0:775667bb8069 13
SK_ROBO_ 0:775667bb8069 14 _familly = p_familly;
SK_ROBO_ 0:775667bb8069 15 switch (_familly) {
SK_ROBO_ 0:775667bb8069 16 case _3201:
SK_ROBO_ 0:775667bb8069 17 _channelsNum = 1;
SK_ROBO_ 0:775667bb8069 18 break;
SK_ROBO_ 0:775667bb8069 19 case _3204:
SK_ROBO_ 0:775667bb8069 20 _channelsNum = 4;
SK_ROBO_ 0:775667bb8069 21 break;
SK_ROBO_ 0:775667bb8069 22 default: // _3208
SK_ROBO_ 0:775667bb8069 23 _channelsNum = 8;
SK_ROBO_ 0:775667bb8069 24 } // End of 'switch' statement
SK_ROBO_ 0:775667bb8069 25 _settings = 0x02; // SGL/DIFF bit set to 1 = See DS21298E-page 19 TABLE 5-1: CONFIGURATION BITS FOR THE MCP3204/TABLE 5-2: CONFIGURATION BITS FOR THE MCP3208
SK_ROBO_ 0:775667bb8069 26 _spiInstance = new SPI(p_mosi, p_miso, p_sclk);
SK_ROBO_ 0:775667bb8069 27 _spiInstance->frequency(p_frequency); // Set the frequency of the SPI interface
SK_ROBO_ 0:775667bb8069 28 _spiInstance->format(8, 3);
SK_ROBO_ 0:775667bb8069 29
SK_ROBO_ 0:775667bb8069 30 if (p_cs != NC) {
SK_ROBO_ 0:775667bb8069 31 _cs = new DigitalOut(p_cs);
SK_ROBO_ 0:775667bb8069 32 _cs->write(1); // Disable chip
SK_ROBO_ 0:775667bb8069 33 } else {
SK_ROBO_ 0:775667bb8069 34 _cs = NULL; // Not used
SK_ROBO_ 0:775667bb8069 35 }
SK_ROBO_ 0:775667bb8069 36
SK_ROBO_ 2:d2c51376ee7c 37 }
SK_ROBO_ 0:775667bb8069 38
SK_ROBO_ 0:775667bb8069 39 CMCP320x_SPI::~CMCP320x_SPI() {
SK_ROBO_ 0:775667bb8069 40 // Release I2C instance
SK_ROBO_ 0:775667bb8069 41 CMCP320x_SPI::SPIModuleRefCounter -= 1;
SK_ROBO_ 0:775667bb8069 42 if (CMCP320x_SPI::SPIModuleRefCounter == 0) {
SK_ROBO_ 0:775667bb8069 43 delete _spiInstance;
SK_ROBO_ 0:775667bb8069 44 _spiInstance = NULL;
SK_ROBO_ 0:775667bb8069 45 }
SK_ROBO_ 0:775667bb8069 46 // Release _reset if required
SK_ROBO_ 0:775667bb8069 47 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 48 _cs->write(1);
SK_ROBO_ 0:775667bb8069 49 delete _cs;
SK_ROBO_ 0:775667bb8069 50 }
SK_ROBO_ 0:775667bb8069 51 }
SK_ROBO_ 0:775667bb8069 52
SK_ROBO_ 0:775667bb8069 53 float CMCP320x_SPI::Read(const Mcp320xChannels p_channels) {
SK_ROBO_ 0:775667bb8069 54
SK_ROBO_ 0:775667bb8069 55 // Read a sample
SK_ROBO_ 0:775667bb8069 56 _sample.value = 0x00;
SK_ROBO_ 0:775667bb8069 57 switch (_familly) {
SK_ROBO_ 0:775667bb8069 58 case _3204:
SK_ROBO_ 0:775667bb8069 59 // No break;
SK_ROBO_ 0:775667bb8069 60 case _3208:
SK_ROBO_ 0:775667bb8069 61 Read_320x(p_channels);
SK_ROBO_ 0:775667bb8069 62 break;
SK_ROBO_ 0:775667bb8069 63 default: // _3201
SK_ROBO_ 0:775667bb8069 64 Read_3201();
SK_ROBO_ 0:775667bb8069 65 break;
SK_ROBO_ 0:775667bb8069 66 } // End of 'switch' statement
SK_ROBO_ 0:775667bb8069 67 //_sample.value >>= 1; // Adjust composite integer for 12 valid bits
SK_ROBO_ 0:775667bb8069 68 _sample.value &= 0x0FFF; // Mask out upper nibble of integer
SK_ROBO_ 0:775667bb8069 69
SK_ROBO_ 0:775667bb8069 70 return _sample.value;
SK_ROBO_ 0:775667bb8069 71 }
SK_ROBO_ 0:775667bb8069 72
SK_ROBO_ 0:775667bb8069 73 void CMCP320x_SPI::SetConfig(const bool p_settings) {
SK_ROBO_ 0:775667bb8069 74
SK_ROBO_ 0:775667bb8069 75 if (_settings) {
SK_ROBO_ 0:775667bb8069 76 _settings = 0x02;
SK_ROBO_ 0:775667bb8069 77 } else {
SK_ROBO_ 0:775667bb8069 78 _settings = 0x00;
SK_ROBO_ 0:775667bb8069 79 }
SK_ROBO_ 0:775667bb8069 80 }
SK_ROBO_ 0:775667bb8069 81
SK_ROBO_ 0:775667bb8069 82 bool CMCP320x_SPI::Shutdown(const bool p_shutdown) {
SK_ROBO_ 0:775667bb8069 83 // Sanity check
SK_ROBO_ 0:775667bb8069 84 if (_cs == NULL) {
SK_ROBO_ 0:775667bb8069 85 return false;
SK_ROBO_ 0:775667bb8069 86 }
SK_ROBO_ 0:775667bb8069 87
SK_ROBO_ 0:775667bb8069 88 _cs->write(p_shutdown == false ? 0 : 1);
SK_ROBO_ 0:775667bb8069 89
SK_ROBO_ 0:775667bb8069 90 return true;
SK_ROBO_ 0:775667bb8069 91 }
SK_ROBO_ 0:775667bb8069 92
SK_ROBO_ 0:775667bb8069 93 void CMCP320x_SPI::Read_3201() {
SK_ROBO_ 0:775667bb8069 94 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 95 _cs->write(0);
SK_ROBO_ 0:775667bb8069 96 wait_us(1);
SK_ROBO_ 0:775667bb8069 97 }
SK_ROBO_ 0:775667bb8069 98 _sample.bytes[1] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 99 _sample.bytes[0] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 100 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 101 _cs->write(1);
SK_ROBO_ 0:775667bb8069 102 }
SK_ROBO_ 0:775667bb8069 103 }
SK_ROBO_ 0:775667bb8069 104
SK_ROBO_ 0:775667bb8069 105 void CMCP320x_SPI::Read_320x(const Mcp320xChannels p_channels) {
SK_ROBO_ 0:775667bb8069 106
SK_ROBO_ 0:775667bb8069 107 unsigned char _channels = (unsigned char)p_channels % _channelsNum;
SK_ROBO_ 0:775667bb8069 108 // Set start bit
SK_ROBO_ 0:775667bb8069 109 unsigned char mask = 0x04 | _settings; // Start bit set to 1 - See DS21298E-page 19 Clause 5.0 SERIAL COMMUNICATIONS
SK_ROBO_ 0:775667bb8069 110 // Set channel address
SK_ROBO_ 0:775667bb8069 111 unsigned char cmd0;
SK_ROBO_ 0:775667bb8069 112 unsigned char cmd1;
SK_ROBO_ 0:775667bb8069 113 if (_familly == _3204) {
SK_ROBO_ 0:775667bb8069 114 cmd0 = mask;
SK_ROBO_ 0:775667bb8069 115 cmd1 = _channels << 6; // MCP3204 has 4 channels in single-ended mode
SK_ROBO_ 0:775667bb8069 116 } else { // MCP3208
SK_ROBO_ 0:775667bb8069 117 cmd0 = mask | ((_channels & 0x04) >> 2); // Extract D2 bit - See DS21298E-page 19 Clause 5.0 SERIAL COMMUNICATIONS
SK_ROBO_ 0:775667bb8069 118 cmd1 = _channels << 6; // MCP3204 has 8 channels in single-ended mode
SK_ROBO_ 0:775667bb8069 119 }
SK_ROBO_ 0:775667bb8069 120 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 121 _cs->write(0);
SK_ROBO_ 0:775667bb8069 122 wait_us(1);
SK_ROBO_ 0:775667bb8069 123 }
SK_ROBO_ 0:775667bb8069 124 _spiInstance->write(cmd0); // Don't care of the result - See DS21298E-page 21 Clause 6.1 Using the MCP3204/3208 with Microcontroller (MCU) SPI Ports
SK_ROBO_ 0:775667bb8069 125 _sample.bytes[1] = _spiInstance->write(cmd1); // DS21298E-page 21 See FIGURE 6-1: SPI Communication using 8-bit segments (Mode 0,0: SCLK idles low)
SK_ROBO_ 0:775667bb8069 126 _sample.bytes[0] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 127 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 128 _cs->write(1);
SK_ROBO_ 0:775667bb8069 129 }
SK_ROBO_ 0:775667bb8069 130
SK_ROBO_ 0:775667bb8069 131 }
SK_ROBO_ 0:775667bb8069 132
SK_ROBO_ 0:775667bb8069 133 } // End of namespace MCP320x_SPI