kota sato / MCP320x

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

Dependents:   Nucleo_mcp3204test

MCP320x.cpp@1:66fdf46dc4de, 2016-01-29 (annotated)

Committer:
SK_ROBO_
Date:
Fri Jan 29 02:36:06 2016 +0000
Revision:
1:66fdf46dc4de
Parent:
0:775667bb8069
Child:
2:d2c51376ee7c
deleted comment.

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 DEBUG_ENTER("CMCP320x_SPI")
SK_ROBO_ 0:775667bb8069 9
SK_ROBO_ 0:775667bb8069 10 CMCP320x_SPI::SPIModuleRefCounter += 1;
SK_ROBO_ 0:775667bb8069 11 if (CMCP320x_SPI::SPIModuleRefCounter > 1) {
SK_ROBO_ 0:775667bb8069 12 //FIXME Check that SPI settings are identical. Otherwise it should failed
SK_ROBO_ 0:775667bb8069 13 return;
SK_ROBO_ 0:775667bb8069 14 }
SK_ROBO_ 0:775667bb8069 15
SK_ROBO_ 0:775667bb8069 16 _familly = p_familly;
SK_ROBO_ 0:775667bb8069 17 switch (_familly) {
SK_ROBO_ 0:775667bb8069 18 case _3201:
SK_ROBO_ 0:775667bb8069 19 _channelsNum = 1;
SK_ROBO_ 0:775667bb8069 20 break;
SK_ROBO_ 0:775667bb8069 21 case _3204:
SK_ROBO_ 0:775667bb8069 22 _channelsNum = 4;
SK_ROBO_ 0:775667bb8069 23 break;
SK_ROBO_ 0:775667bb8069 24 default: // _3208
SK_ROBO_ 0:775667bb8069 25 _channelsNum = 8;
SK_ROBO_ 0:775667bb8069 26 } // End of 'switch' statement
SK_ROBO_ 0:775667bb8069 27 _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 28 DEBUG("CMCP320x_SPI: familly:%d - #channels:%d", _familly, _channelsNum)
SK_ROBO_ 0:775667bb8069 29 _spiInstance = new SPI(p_mosi, p_miso, p_sclk);
SK_ROBO_ 0:775667bb8069 30 _spiInstance->frequency(p_frequency); // Set the frequency of the SPI interface
SK_ROBO_ 0:775667bb8069 31 _spiInstance->format(8, 3);
SK_ROBO_ 0:775667bb8069 32 DEBUG_ENTER("CMCP320x_SPI: refCounter=%d", CMCP320x_SPI::SPIModuleRefCounter)
SK_ROBO_ 0:775667bb8069 33
SK_ROBO_ 0:775667bb8069 34 if (p_cs != NC) {
SK_ROBO_ 0:775667bb8069 35 DEBUG("CMCP320x_SPI: /CS managed");
SK_ROBO_ 0:775667bb8069 36 _cs = new DigitalOut(p_cs);
SK_ROBO_ 0:775667bb8069 37 _cs->write(1); // Disable chip
SK_ROBO_ 0:775667bb8069 38 } else {
SK_ROBO_ 0:775667bb8069 39 DEBUG("CMCP320x_SPI: /CS not managed");
SK_ROBO_ 0:775667bb8069 40 _cs = NULL; // Not used
SK_ROBO_ 0:775667bb8069 41 }
SK_ROBO_ 0:775667bb8069 42
SK_ROBO_ 0:775667bb8069 43
SK_ROBO_ 0:775667bb8069 44 DEBUG_LEAVE("CMCP320x_SPI")
SK_ROBO_ 0:775667bb8069 45 }
SK_ROBO_ 0:775667bb8069 46
SK_ROBO_ 0:775667bb8069 47 CMCP320x_SPI::~CMCP320x_SPI() {
SK_ROBO_ 0:775667bb8069 48 DEBUG_ENTER("~CMCP320x_SPI")
SK_ROBO_ 0:775667bb8069 49
SK_ROBO_ 0:775667bb8069 50 // Release I2C instance
SK_ROBO_ 0:775667bb8069 51 DEBUG_ENTER("~CMCP320x_SPI: refCounter=%d", CMCP320x_SPI::SPIModuleRefCounter)
SK_ROBO_ 0:775667bb8069 52 CMCP320x_SPI::SPIModuleRefCounter -= 1;
SK_ROBO_ 0:775667bb8069 53 if (CMCP320x_SPI::SPIModuleRefCounter == 0) {
SK_ROBO_ 0:775667bb8069 54 delete _spiInstance;
SK_ROBO_ 0:775667bb8069 55 _spiInstance = NULL;
SK_ROBO_ 0:775667bb8069 56 }
SK_ROBO_ 0:775667bb8069 57 // Release _reset if required
SK_ROBO_ 0:775667bb8069 58 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 59 _cs->write(1);
SK_ROBO_ 0:775667bb8069 60 delete _cs;
SK_ROBO_ 0:775667bb8069 61 }
SK_ROBO_ 0:775667bb8069 62
SK_ROBO_ 0:775667bb8069 63 DEBUG_LEAVE("~CMCP320x_SPI")
SK_ROBO_ 0:775667bb8069 64 }
SK_ROBO_ 0:775667bb8069 65
SK_ROBO_ 0:775667bb8069 66 float CMCP320x_SPI::Read(const Mcp320xChannels p_channels) {
SK_ROBO_ 0:775667bb8069 67 DEBUG_ENTER("CMCP320x_SPI::Read: %d", (unsigned char)p_channels)
SK_ROBO_ 0:775667bb8069 68
SK_ROBO_ 0:775667bb8069 69 // Read a sample
SK_ROBO_ 0:775667bb8069 70 _sample.value = 0x00;
SK_ROBO_ 0:775667bb8069 71 switch (_familly) {
SK_ROBO_ 0:775667bb8069 72 case _3204:
SK_ROBO_ 0:775667bb8069 73 // No break;
SK_ROBO_ 0:775667bb8069 74 case _3208:
SK_ROBO_ 0:775667bb8069 75 Read_320x(p_channels);
SK_ROBO_ 0:775667bb8069 76 break;
SK_ROBO_ 0:775667bb8069 77 default: // _3201
SK_ROBO_ 0:775667bb8069 78 Read_3201();
SK_ROBO_ 0:775667bb8069 79 break;
SK_ROBO_ 0:775667bb8069 80 } // End of 'switch' statement
SK_ROBO_ 0:775667bb8069 81 DEBUG("CMCP320x_SPI::Read: 0x%02x - 0x%02x", _sample.bytes[0], _sample.bytes[1])
SK_ROBO_ 0:775667bb8069 82 //_sample.value >>= 1; // Adjust composite integer for 12 valid bits
SK_ROBO_ 0:775667bb8069 83 _sample.value &= 0x0FFF; // Mask out upper nibble of integer
SK_ROBO_ 0:775667bb8069 84
SK_ROBO_ 0:775667bb8069 85 DEBUG_LEAVE("CMCP320x_SPI::Read: %lu", _sample.value)
SK_ROBO_ 0:775667bb8069 86 return _sample.value;
SK_ROBO_ 0:775667bb8069 87 }
SK_ROBO_ 0:775667bb8069 88
SK_ROBO_ 0:775667bb8069 89 void CMCP320x_SPI::SetConfig(const bool p_settings) {
SK_ROBO_ 0:775667bb8069 90 DEBUG_LEAVE("CMCP320x_SPI::SetConfig: %x", (unsigned char)p_settings)
SK_ROBO_ 0:775667bb8069 91
SK_ROBO_ 0:775667bb8069 92 if (_settings) {
SK_ROBO_ 0:775667bb8069 93 _settings = 0x02;
SK_ROBO_ 0:775667bb8069 94 } else {
SK_ROBO_ 0:775667bb8069 95 _settings = 0x00;
SK_ROBO_ 0:775667bb8069 96 }
SK_ROBO_ 0:775667bb8069 97 }
SK_ROBO_ 0:775667bb8069 98
SK_ROBO_ 0:775667bb8069 99 bool CMCP320x_SPI::Shutdown(const bool p_shutdown) {
SK_ROBO_ 0:775667bb8069 100 // Sanity check
SK_ROBO_ 0:775667bb8069 101 if (_cs == NULL) {
SK_ROBO_ 0:775667bb8069 102 return false;
SK_ROBO_ 0:775667bb8069 103 }
SK_ROBO_ 0:775667bb8069 104
SK_ROBO_ 0:775667bb8069 105 _cs->write(p_shutdown == false ? 0 : 1);
SK_ROBO_ 0:775667bb8069 106
SK_ROBO_ 0:775667bb8069 107 return true;
SK_ROBO_ 0:775667bb8069 108 }
SK_ROBO_ 0:775667bb8069 109
SK_ROBO_ 0:775667bb8069 110 void CMCP320x_SPI::Read_3201() {
SK_ROBO_ 0:775667bb8069 111 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 112 _cs->write(0);
SK_ROBO_ 0:775667bb8069 113 wait_us(1);
SK_ROBO_ 0:775667bb8069 114 }
SK_ROBO_ 0:775667bb8069 115 _sample.bytes[1] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 116 _sample.bytes[0] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 117 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 118 _cs->write(1);
SK_ROBO_ 0:775667bb8069 119 }
SK_ROBO_ 0:775667bb8069 120 }
SK_ROBO_ 0:775667bb8069 121
SK_ROBO_ 0:775667bb8069 122 void CMCP320x_SPI::Read_320x(const Mcp320xChannels p_channels) {
SK_ROBO_ 0:775667bb8069 123 DEBUG_ENTER("CMCP320x_SPI::Read_320x: %d", (unsigned char)p_channels)
SK_ROBO_ 0:775667bb8069 124
SK_ROBO_ 0:775667bb8069 125 unsigned char _channels = (unsigned char)p_channels % _channelsNum;
SK_ROBO_ 0:775667bb8069 126 // Set start bit
SK_ROBO_ 0:775667bb8069 127 unsigned char mask = 0x04 | _settings; // Start bit set to 1 - See DS21298E-page 19 Clause 5.0 SERIAL COMMUNICATIONS
SK_ROBO_ 0:775667bb8069 128 // Set channel address
SK_ROBO_ 0:775667bb8069 129 unsigned char cmd0;
SK_ROBO_ 0:775667bb8069 130 unsigned char cmd1;
SK_ROBO_ 0:775667bb8069 131 if (_familly == _3204) {
SK_ROBO_ 0:775667bb8069 132 cmd0 = mask;
SK_ROBO_ 0:775667bb8069 133 cmd1 = _channels << 6; // MCP3204 has 4 channels in single-ended mode
SK_ROBO_ 0:775667bb8069 134 } else { // MCP3208
SK_ROBO_ 0:775667bb8069 135 cmd0 = mask | ((_channels & 0x04) >> 2); // Extract D2 bit - See DS21298E-page 19 Clause 5.0 SERIAL COMMUNICATIONS
SK_ROBO_ 0:775667bb8069 136 cmd1 = _channels << 6; // MCP3204 has 8 channels in single-ended mode
SK_ROBO_ 0:775667bb8069 137 }
SK_ROBO_ 0:775667bb8069 138 DEBUG("CMCP320x_SPI::Read_320x: cmd0:%02x - cmd1:%02x", cmd0, cmd1)
SK_ROBO_ 0:775667bb8069 139 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 140 _cs->write(0);
SK_ROBO_ 0:775667bb8069 141 wait_us(1);
SK_ROBO_ 0:775667bb8069 142 }
SK_ROBO_ 0:775667bb8069 143 _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 144 _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 145 _sample.bytes[0] = _spiInstance->write(0);
SK_ROBO_ 0:775667bb8069 146 if (_cs != NULL) {
SK_ROBO_ 0:775667bb8069 147 _cs->write(1);
SK_ROBO_ 0:775667bb8069 148 }
SK_ROBO_ 0:775667bb8069 149
SK_ROBO_ 0:775667bb8069 150 DEBUG_LEAVE("CMCP320x_SPI::Read_320x")
SK_ROBO_ 0:775667bb8069 151 }
SK_ROBO_ 0:775667bb8069 152
SK_ROBO_ 0:775667bb8069 153 } // End of namespace MCP320x_SPI