nexpaq / SerialInterface

Command processor to access I2C and SPI Takes URI coded commands and returns JSON array

Fork of SerialInterface by Greg Steiert

SerialInterface.cpp@5:9e27e2a46fa6, 2016-12-14 (annotated)

Committer:
switches
Date:
Wed Dec 14 19:52:31 2016 +0000
Revision:
5:9e27e2a46fa6
Parent:
4:0bd9ec504040
Child:
6:c9b7256c8261
Added dio GPIO function and configuration options for SPI

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gsteiert 0:828bfd94972b 1 /* Pmod Interface Library
gsteiert 0:828bfd94972b 2 *
gsteiert 0:828bfd94972b 3 */
gsteiert 0:828bfd94972b 4
gsteiert 0:828bfd94972b 5 #include "mbed.h"
switches 2:3f6a8ac111a9 6 #include "SerialInterface.h"
gsteiert 0:828bfd94972b 7
switches 2:3f6a8ac111a9 8 SerialInterface::SerialInterface()
gsteiert 0:828bfd94972b 9 {
gsteiert 0:828bfd94972b 10 }
gsteiert 0:828bfd94972b 11
switches 2:3f6a8ac111a9 12 SerialInterface::~SerialInterface()
gsteiert 0:828bfd94972b 13 {
gsteiert 0:828bfd94972b 14 }
gsteiert 0:828bfd94972b 15
switches 2:3f6a8ac111a9 16 // Initialize SerialInterface
switches 5:9e27e2a46fa6 17 void SerialInterface::init(I2C* i2c, SPI* spi, DigitalInOut* gpio)
gsteiert 0:828bfd94972b 18 {
switches 2:3f6a8ac111a9 19 _i2c = i2c; // save pointer to I2C interface
switches 2:3f6a8ac111a9 20 _spi = spi; // save pointer to SPI interface
switches 5:9e27e2a46fa6 21 _gpio = gpio; // save pointer to GPIO pins
switches 5:9e27e2a46fa6 22 }
switches 5:9e27e2a46fa6 23
switches 5:9e27e2a46fa6 24 /* Digital I/O
switches 5:9e27e2a46fa6 25 * /d read all
switches 5:9e27e2a46fa6 26 * /d/[pin] read from pin
switches 5:9e27e2a46fa6 27 * /d/[pin]/[cfg] write configuration to pin
switches 5:9e27e2a46fa6 28 * [pin] = number (from 0 to 7) of the pin to access
switches 5:9e27e2a46fa6 29 * [cfg] = pin configuration:
switches 5:9e27e2a46fa6 30 * 0 - output low
switches 5:9e27e2a46fa6 31 * 1 - output high
switches 5:9e27e2a46fa6 32 * 2 - input pull down
switches 5:9e27e2a46fa6 33 * 3 - input pull up
switches 5:9e27e2a46fa6 34 * 4 - input pull none
switches 5:9e27e2a46fa6 35 */
switches 5:9e27e2a46fa6 36 void SerialInterface::fnc_dio(char* resp)
switches 5:9e27e2a46fa6 37 {
switches 5:9e27e2a46fa6 38 int bdat;
switches 5:9e27e2a46fa6 39 int bcnt;
switches 5:9e27e2a46fa6 40 switch (_args[0]) {
switches 5:9e27e2a46fa6 41 case 0:
switches 5:9e27e2a46fa6 42 sprintf(resp, "[");
switches 5:9e27e2a46fa6 43 resp +=1;
switches 5:9e27e2a46fa6 44 for (bcnt = 0; bcnt < 8 ; bcnt++) {
switches 5:9e27e2a46fa6 45 bdat = _gpio[bcnt].read();
switches 5:9e27e2a46fa6 46 sprintf(resp, "%d,", bdat);
switches 5:9e27e2a46fa6 47 resp +=2;
switches 5:9e27e2a46fa6 48 }
switches 5:9e27e2a46fa6 49 sprintf((resp-1), "]");
switches 5:9e27e2a46fa6 50 break;
switches 5:9e27e2a46fa6 51 case 1:
switches 5:9e27e2a46fa6 52 if (_args[1] > 7) {
switches 5:9e27e2a46fa6 53 sprintf(resp, "[-1]");
switches 5:9e27e2a46fa6 54 } else {
switches 5:9e27e2a46fa6 55 sprintf(resp,"[%d]", _gpio[_args[1]].read());
switches 5:9e27e2a46fa6 56 }
switches 5:9e27e2a46fa6 57 break;
switches 5:9e27e2a46fa6 58 case 2:
switches 5:9e27e2a46fa6 59 if (_args[1] > 7) {
switches 5:9e27e2a46fa6 60 sprintf(resp, "[-1]");
switches 5:9e27e2a46fa6 61 } else {
switches 5:9e27e2a46fa6 62 if (_args[2] < 2) {
switches 5:9e27e2a46fa6 63 _gpio[_args[1]].write(_args[2]);
switches 5:9e27e2a46fa6 64 _gpio[_args[1]].output();
switches 5:9e27e2a46fa6 65 } else {
switches 5:9e27e2a46fa6 66 if (_args[2] == 2) {
switches 5:9e27e2a46fa6 67 _gpio[_args[1]].mode(PullDown);
switches 5:9e27e2a46fa6 68 } else if (_args[2] == 3) {
switches 5:9e27e2a46fa6 69 _gpio[_args[1]].mode(PullUp);
switches 5:9e27e2a46fa6 70 } else {
switches 5:9e27e2a46fa6 71 _gpio[_args[1]].mode(PullNone);
switches 5:9e27e2a46fa6 72 }
switches 5:9e27e2a46fa6 73 _gpio[_args[1]].input();
switches 5:9e27e2a46fa6 74 }
switches 5:9e27e2a46fa6 75 sprintf(resp,"[%d]", _args[2]);
switches 5:9e27e2a46fa6 76 }
switches 5:9e27e2a46fa6 77 break;
switches 5:9e27e2a46fa6 78 default:
switches 5:9e27e2a46fa6 79 sprintf(resp, "[-1]");
switches 5:9e27e2a46fa6 80 break;
switches 5:9e27e2a46fa6 81 }
gsteiert 0:828bfd94972b 82 }
gsteiert 0:828bfd94972b 83
gsteiert 0:828bfd94972b 84 /* I2C
gsteiert 0:828bfd94972b 85 * /i/[even]/[data]... write
gsteiert 0:828bfd94972b 86 * /i/[odd]/[cnt]/[data]... read
gsteiert 0:828bfd94972b 87 * [even] = even I2C address used for writes
gsteiert 0:828bfd94972b 88 * [odd] = odd I2C address used for reads
gsteiert 0:828bfd94972b 89 * [data] = data to be writen, if data is included with a read, the data
gsteiert 0:828bfd94972b 90 * will be written prior to the read to set the register address
gsteiert 0:828bfd94972b 91 * [cnt] = number of bytes to read
switches 3:601b78524967 92 * returns data read in JSON array
gsteiert 0:828bfd94972b 93 */
switches 2:3f6a8ac111a9 94 void SerialInterface::fnc_i2c(char* resp)
gsteiert 0:828bfd94972b 95 {
gsteiert 0:828bfd94972b 96 int dcnt=0;
gsteiert 0:828bfd94972b 97 if (_args[IA_CNT] < 2) {
switches 2:3f6a8ac111a9 98 sprintf(resp, "[-1]");
gsteiert 0:828bfd94972b 99 } else {
gsteiert 0:828bfd94972b 100 if (_args[IA_ADD] & 1) {
switches 2:3f6a8ac111a9 101 sprintf(resp, "[");
switches 2:3f6a8ac111a9 102 resp +=1;
gsteiert 0:828bfd94972b 103 if (_args[IA_CNT] > 2) {
gsteiert 0:828bfd94972b 104 for (dcnt = 0; dcnt < (_args[IA_CNT] -2) ; dcnt++) {
gsteiert 0:828bfd94972b 105 _dbuf[dcnt] = _args[(dcnt +3)];
gsteiert 0:828bfd94972b 106 }
gsteiert 0:828bfd94972b 107 if ((*_i2c).write(_args[IA_ADD], _dbuf, dcnt, true) != 0) {
switches 2:3f6a8ac111a9 108 sprintf(resp, "-1,");
switches 2:3f6a8ac111a9 109 resp +=3;
gsteiert 0:828bfd94972b 110 }
gsteiert 0:828bfd94972b 111 }
gsteiert 0:828bfd94972b 112 if ((*_i2c).read(_args[IA_ADD], _dbuf, _args[IA_DATA])!=0) {
switches 2:3f6a8ac111a9 113 sprintf(resp, "-1]");
gsteiert 0:828bfd94972b 114 } else {
gsteiert 0:828bfd94972b 115 for (dcnt = 0; dcnt < _args[IA_DATA]; dcnt++) {
switches 2:3f6a8ac111a9 116 sprintf(resp,"0x%02X,", _dbuf[dcnt]);
gsteiert 0:828bfd94972b 117 resp +=5;
gsteiert 0:828bfd94972b 118 }
switches 2:3f6a8ac111a9 119 sprintf((resp-1), "]");
gsteiert 0:828bfd94972b 120 }
gsteiert 0:828bfd94972b 121 } else {
gsteiert 0:828bfd94972b 122 for (dcnt = 0; dcnt < (_args[IA_CNT] -1) ; dcnt++) {
gsteiert 0:828bfd94972b 123 _dbuf[dcnt] = _args[(dcnt +2)];
gsteiert 0:828bfd94972b 124 }
gsteiert 0:828bfd94972b 125 if ((*_i2c).write(_args[IA_ADD], _dbuf, dcnt) == 0) {
switches 2:3f6a8ac111a9 126 sprintf(resp,"[%d]", dcnt);
gsteiert 0:828bfd94972b 127 } else {
switches 2:3f6a8ac111a9 128 sprintf(resp, "[-1]");
gsteiert 0:828bfd94972b 129 }
gsteiert 0:828bfd94972b 130 }
gsteiert 0:828bfd94972b 131 }
gsteiert 0:828bfd94972b 132 }
gsteiert 0:828bfd94972b 133
switches 2:3f6a8ac111a9 134 /* SPI
switches 5:9e27e2a46fa6 135 * /s/[cfg]/[data]... read+write
switches 5:9e27e2a46fa6 136 * [cfg] = SPI configuration specifies gpio to use for chip
switches 5:9e27e2a46fa6 137 * select and other SPI parameters:
switches 5:9e27e2a46fa6 138 * 0x[Byte3][Byte2][Byte1][Byte0]
switches 5:9e27e2a46fa6 139 * Byte3 = SCK frequency in MHz (0 = no change)
switches 5:9e27e2a46fa6 140 * Byte2 = Format:
switches 5:9e27e2a46fa6 141 * 0 = no change
switches 5:9e27e2a46fa6 142 * 1 = Mode 1
switches 5:9e27e2a46fa6 143 * 2 = Mode 2
switches 5:9e27e2a46fa6 144 * 3 = Mode 3
switches 5:9e27e2a46fa6 145 * 4 = Mode 0
switches 5:9e27e2a46fa6 146 * Byte1 = CS polarity 1 = active high, 0 = active low
switches 5:9e27e2a46fa6 147 * Byte0 = GPIO to use for CS (0-7)
switches 5:9e27e2a46fa6 148 * 0 = P5_3
switches 5:9e27e2a46fa6 149 * 1 = P5_4
switches 5:9e27e2a46fa6 150 * 2 = P5_5
switches 5:9e27e2a46fa6 151 * 3 = P5_6
switches 5:9e27e2a46fa6 152 * 4 = P3_0
switches 5:9e27e2a46fa6 153 * 5 = P3_1
switches 5:9e27e2a46fa6 154 * 6 = P3_2
switches 5:9e27e2a46fa6 155 * 7 = P3_3
switches 2:3f6a8ac111a9 156 * [data] = data to be writen
switches 3:601b78524967 157 * this shifts out each data byte provided and
switches 3:601b78524967 158 * returns each byte read in a JSON array
gsteiert 0:828bfd94972b 159 */
switches 2:3f6a8ac111a9 160 void SerialInterface::fnc_spi(char* resp)
gsteiert 0:828bfd94972b 161 {
switches 5:9e27e2a46fa6 162 int dcnt=1;
switches 2:3f6a8ac111a9 163 int dataIn;
switches 5:9e27e2a46fa6 164 spiConfig_t spiCfg;
switches 2:3f6a8ac111a9 165 if (_args[0] < 1) {
switches 2:3f6a8ac111a9 166 sprintf(resp, "[-1]");
gsteiert 0:828bfd94972b 167 } else {
switches 5:9e27e2a46fa6 168 spiCfg.merged = _args[1];
switches 5:9e27e2a46fa6 169 if (spiCfg.freq) {
switches 5:9e27e2a46fa6 170 (*_spi).frequency(spiCfg.freq * 1000000);
switches 5:9e27e2a46fa6 171 }
switches 5:9e27e2a46fa6 172 if (spiCfg.format) {
switches 5:9e27e2a46fa6 173 (*_spi).format(8, (spiCfg.format & 3));
gsteiert 0:828bfd94972b 174 }
switches 5:9e27e2a46fa6 175 if (_args[0] > 1) {
switches 5:9e27e2a46fa6 176 sprintf(resp, "[");
switches 5:9e27e2a46fa6 177 resp++;
switches 5:9e27e2a46fa6 178 _gpio[spiCfg.csPin] = (spiCfg.csPol);
switches 5:9e27e2a46fa6 179 while(dcnt < _args[0]) {
switches 5:9e27e2a46fa6 180 dcnt++;
switches 5:9e27e2a46fa6 181 dataIn = (*_spi).write(_args[dcnt]);
switches 5:9e27e2a46fa6 182 sprintf(resp, "0x%02X,", dataIn);
switches 5:9e27e2a46fa6 183 resp += 5;
switches 5:9e27e2a46fa6 184 }
switches 5:9e27e2a46fa6 185 _gpio[spiCfg.csPin] = !(spiCfg.csPol);
switches 5:9e27e2a46fa6 186 sprintf((resp-1), "]");
switches 5:9e27e2a46fa6 187 }
gsteiert 0:828bfd94972b 188 }
gsteiert 0:828bfd94972b 189 }
gsteiert 0:828bfd94972b 190
switches 2:3f6a8ac111a9 191 void SerialInterface::call(char* input, char* output)
gsteiert 0:828bfd94972b 192 {
gsteiert 0:828bfd94972b 193 char cmd;
gsteiert 0:828bfd94972b 194 _args[0] = 0;
gsteiert 0:828bfd94972b 195 if (*input == '/') {
gsteiert 0:828bfd94972b 196 input++;
gsteiert 0:828bfd94972b 197 cmd = *input;
gsteiert 0:828bfd94972b 198 input = strchr(input, '/');
gsteiert 0:828bfd94972b 199 while (*input == '/') {
gsteiert 0:828bfd94972b 200 input++;
gsteiert 0:828bfd94972b 201 _args[(_args[0]+1)] = strtol(input, &input, 0);
gsteiert 0:828bfd94972b 202 if (input) {
gsteiert 0:828bfd94972b 203 _args[0]++;
gsteiert 0:828bfd94972b 204 }
gsteiert 0:828bfd94972b 205 }
gsteiert 0:828bfd94972b 206 switch (cmd) {
switches 5:9e27e2a46fa6 207 case 'd':
switches 5:9e27e2a46fa6 208 case 'D':
switches 5:9e27e2a46fa6 209 fnc_dio(output);
switches 5:9e27e2a46fa6 210 break;
gsteiert 0:828bfd94972b 211 case 'i':
gsteiert 0:828bfd94972b 212 case 'I':
gsteiert 0:828bfd94972b 213 fnc_i2c(output);
gsteiert 0:828bfd94972b 214 break;
gsteiert 0:828bfd94972b 215 case 's':
gsteiert 0:828bfd94972b 216 case 'S':
gsteiert 0:828bfd94972b 217 fnc_spi(output);
gsteiert 0:828bfd94972b 218 break;
gsteiert 0:828bfd94972b 219 default:
switches 5:9e27e2a46fa6 220 sprintf(output, "!commands: dio i2c spi");
gsteiert 0:828bfd94972b 221 break;
gsteiert 0:828bfd94972b 222 }
gsteiert 0:828bfd94972b 223 } else {
gsteiert 0:828bfd94972b 224 sprintf(output, "!format: /cmd/arg1/arg2...");
gsteiert 0:828bfd94972b 225
gsteiert 0:828bfd94972b 226 }
gsteiert 0:828bfd94972b 227 }