Manas Savkoor / Mbed 2 deprecated adc_timer_try9

for utkalika use

Dependencies:   mbed

Fork of adc_timer_try7 by Manas Savkoor

adc.cpp@0:bf25fa7f7ff8, 2013-01-15 (annotated)

Committer:
manants
Date:
Tue Jan 15 08:31:02 2013 +0000
Revision:
0:bf25fa7f7ff8
first trial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
manants 0:bf25fa7f7ff8 1 /* mbed Library - ADC
manants 0:bf25fa7f7ff8 2 * Copyright (c) 2010, sblandford
manants 0:bf25fa7f7ff8 3 * released under MIT license http://mbed.org/licence/mit
manants 0:bf25fa7f7ff8 4 */
manants 0:bf25fa7f7ff8 5 #include "mbed.h"
manants 0:bf25fa7f7ff8 6 #include "adc.h"
manants 0:bf25fa7f7ff8 7
manants 0:bf25fa7f7ff8 8
manants 0:bf25fa7f7ff8 9 ADC *ADC::instance;
manants 0:bf25fa7f7ff8 10
manants 0:bf25fa7f7ff8 11 ADC::ADC(int sample_rate, int cclk_div)
manants 0:bf25fa7f7ff8 12 {
manants 0:bf25fa7f7ff8 13
manants 0:bf25fa7f7ff8 14 int i, adc_clk_freq, pclk, clock_div, max_div=1;
manants 0:bf25fa7f7ff8 15
manants 0:bf25fa7f7ff8 16 //Work out CCLK
manants 0:bf25fa7f7ff8 17 adc_clk_freq=CLKS_PER_SAMPLE*sample_rate;
manants 0:bf25fa7f7ff8 18 int m = (LPC_SC->PLL0CFG & 0xFFFF) + 1;
manants 0:bf25fa7f7ff8 19 int n = (LPC_SC->PLL0CFG >> 16) + 1;
manants 0:bf25fa7f7ff8 20 int cclkdiv = LPC_SC->CCLKCFG + 1;
manants 0:bf25fa7f7ff8 21 int Fcco = (2 * m * XTAL_FREQ) / n;
manants 0:bf25fa7f7ff8 22 int cclk = Fcco / cclkdiv;
manants 0:bf25fa7f7ff8 23
manants 0:bf25fa7f7ff8 24 //Power up the ADC
manants 0:bf25fa7f7ff8 25 LPC_SC->PCONP |= (1 << 12);
manants 0:bf25fa7f7ff8 26 //Set clock at cclk / 1.
manants 0:bf25fa7f7ff8 27 LPC_SC->PCLKSEL0 &= ~(0x3 << 24);
manants 0:bf25fa7f7ff8 28 switch (cclk_div) {
manants 0:bf25fa7f7ff8 29 case 1:
manants 0:bf25fa7f7ff8 30 LPC_SC->PCLKSEL0 |= 0x1 << 24;
manants 0:bf25fa7f7ff8 31 break;
manants 0:bf25fa7f7ff8 32 case 2:
manants 0:bf25fa7f7ff8 33 LPC_SC->PCLKSEL0 |= 0x2 << 24;
manants 0:bf25fa7f7ff8 34 break;
manants 0:bf25fa7f7ff8 35 case 4:
manants 0:bf25fa7f7ff8 36 LPC_SC->PCLKSEL0 |= 0x0 << 24;
manants 0:bf25fa7f7ff8 37 break;
manants 0:bf25fa7f7ff8 38 case 8:
manants 0:bf25fa7f7ff8 39 LPC_SC->PCLKSEL0 |= 0x3 << 24;
manants 0:bf25fa7f7ff8 40 break;
manants 0:bf25fa7f7ff8 41 default:
manants 0:bf25fa7f7ff8 42 fprintf(stderr, "Warning: ADC CCLK clock divider must be 1, 2, 4 or 8. %u supplied.\n",
manants 0:bf25fa7f7ff8 43 cclk_div);
manants 0:bf25fa7f7ff8 44 fprintf(stderr, "Defaulting to 1.\n");
manants 0:bf25fa7f7ff8 45 LPC_SC->PCLKSEL0 |= 0x1 << 24;
manants 0:bf25fa7f7ff8 46 break;
manants 0:bf25fa7f7ff8 47 }
manants 0:bf25fa7f7ff8 48 pclk = cclk / cclk_div;
manants 0:bf25fa7f7ff8 49 clock_div=pclk / adc_clk_freq;
manants 0:bf25fa7f7ff8 50
manants 0:bf25fa7f7ff8 51 if (clock_div > 0xFF) {
manants 0:bf25fa7f7ff8 52 fprintf(stderr, "Warning: Clock division is %u which is above 255 limit. Re-Setting at limit.\n",
manants 0:bf25fa7f7ff8 53 clock_div);
manants 0:bf25fa7f7ff8 54 clock_div=0xFF;
manants 0:bf25fa7f7ff8 55 }
manants 0:bf25fa7f7ff8 56 if (clock_div == 0) {
manants 0:bf25fa7f7ff8 57 fprintf(stderr, "Warning: Clock division is 0. Re-Setting to 1.\n");
manants 0:bf25fa7f7ff8 58 clock_div=1;
manants 0:bf25fa7f7ff8 59 }
manants 0:bf25fa7f7ff8 60
manants 0:bf25fa7f7ff8 61 _adc_clk_freq=pclk / clock_div;
manants 0:bf25fa7f7ff8 62 if (_adc_clk_freq > MAX_ADC_CLOCK) {
manants 0:bf25fa7f7ff8 63 fprintf(stderr, "Warning: Actual ADC sample rate of %u which is above %u limit\n",
manants 0:bf25fa7f7ff8 64 _adc_clk_freq / CLKS_PER_SAMPLE, MAX_ADC_CLOCK / CLKS_PER_SAMPLE);
manants 0:bf25fa7f7ff8 65 while ((pclk / max_div) > MAX_ADC_CLOCK) max_div++;
manants 0:bf25fa7f7ff8 66 fprintf(stderr, "Maximum recommended sample rate is %u\n", (pclk / max_div) / CLKS_PER_SAMPLE);
manants 0:bf25fa7f7ff8 67 }
manants 0:bf25fa7f7ff8 68
manants 0:bf25fa7f7ff8 69 LPC_ADC->ADCR =
manants 0:bf25fa7f7ff8 70 ((clock_div - 1 ) << 8 ) | //Clkdiv
manants 0:bf25fa7f7ff8 71 ( 1 << 21 ); //A/D operational
manants 0:bf25fa7f7ff8 72
manants 0:bf25fa7f7ff8 73 //Default no channels enabled
manants 0:bf25fa7f7ff8 74 LPC_ADC->ADCR &= ~0xFF;
manants 0:bf25fa7f7ff8 75 //Default NULL global custom isr
manants 0:bf25fa7f7ff8 76 _adc_g_isr = NULL;
manants 0:bf25fa7f7ff8 77 //Initialize arrays
manants 0:bf25fa7f7ff8 78 for (i=7; i>=0; i--) {
manants 0:bf25fa7f7ff8 79 _adc_data[i] = 0;
manants 0:bf25fa7f7ff8 80 _adc_isr[i] = NULL;
manants 0:bf25fa7f7ff8 81 }
manants 0:bf25fa7f7ff8 82
manants 0:bf25fa7f7ff8 83
manants 0:bf25fa7f7ff8 84 //* Attach IRQ
manants 0:bf25fa7f7ff8 85 instance = this;
manants 0:bf25fa7f7ff8 86 NVIC_SetVector(ADC_IRQn, (uint32_t)&_adcisr);
manants 0:bf25fa7f7ff8 87
manants 0:bf25fa7f7ff8 88 //Disable global interrupt
manants 0:bf25fa7f7ff8 89 LPC_ADC->ADINTEN &= ~0x100;
manants 0:bf25fa7f7ff8 90
manants 0:bf25fa7f7ff8 91 };
manants 0:bf25fa7f7ff8 92
manants 0:bf25fa7f7ff8 93 void ADC::_adcisr(void)
manants 0:bf25fa7f7ff8 94 {
manants 0:bf25fa7f7ff8 95 instance->adcisr();
manants 0:bf25fa7f7ff8 96 }
manants 0:bf25fa7f7ff8 97
manants 0:bf25fa7f7ff8 98
manants 0:bf25fa7f7ff8 99 void ADC::adcisr(void)
manants 0:bf25fa7f7ff8 100 {
manants 0:bf25fa7f7ff8 101 uint32_t stat;
manants 0:bf25fa7f7ff8 102 int chan;
manants 0:bf25fa7f7ff8 103
manants 0:bf25fa7f7ff8 104 // Read status
manants 0:bf25fa7f7ff8 105 stat = LPC_ADC->ADSTAT;
manants 0:bf25fa7f7ff8 106 //Scan channels for over-run or done and update array
manants 0:bf25fa7f7ff8 107 if (stat & 0x0101) _adc_data[0] = LPC_ADC->ADDR0;
manants 0:bf25fa7f7ff8 108 if (stat & 0x0202) _adc_data[1] = LPC_ADC->ADDR1;
manants 0:bf25fa7f7ff8 109 if (stat & 0x0404) _adc_data[2] = LPC_ADC->ADDR2;
manants 0:bf25fa7f7ff8 110 if (stat & 0x0808) _adc_data[3] = LPC_ADC->ADDR3;
manants 0:bf25fa7f7ff8 111 if (stat & 0x1010) _adc_data[4] = LPC_ADC->ADDR4;
manants 0:bf25fa7f7ff8 112 if (stat & 0x2020) _adc_data[5] = LPC_ADC->ADDR5;
manants 0:bf25fa7f7ff8 113 if (stat & 0x4040) _adc_data[6] = LPC_ADC->ADDR6;
manants 0:bf25fa7f7ff8 114 if (stat & 0x8080) _adc_data[7] = LPC_ADC->ADDR7;
manants 0:bf25fa7f7ff8 115
manants 0:bf25fa7f7ff8 116 // Channel that triggered interrupt
manants 0:bf25fa7f7ff8 117 chan = (LPC_ADC->ADGDR >> 24) & 0x07;
manants 0:bf25fa7f7ff8 118 //User defined interrupt handlers
manants 0:bf25fa7f7ff8 119 if (_adc_isr[chan] != NULL)
manants 0:bf25fa7f7ff8 120 _adc_isr[chan](_adc_data[chan]);
manants 0:bf25fa7f7ff8 121 if (_adc_g_isr != NULL)
manants 0:bf25fa7f7ff8 122 _adc_g_isr(chan, _adc_data[chan]);
manants 0:bf25fa7f7ff8 123 return;
manants 0:bf25fa7f7ff8 124 }
manants 0:bf25fa7f7ff8 125
manants 0:bf25fa7f7ff8 126 int ADC::_pin_to_channel(PinName pin) {
manants 0:bf25fa7f7ff8 127 int chan;
manants 0:bf25fa7f7ff8 128 switch (pin) {
manants 0:bf25fa7f7ff8 129 case p15://=p0.23 of LPC1768
manants 0:bf25fa7f7ff8 130 default:
manants 0:bf25fa7f7ff8 131 chan=0;
manants 0:bf25fa7f7ff8 132 break;
manants 0:bf25fa7f7ff8 133 case p16://=p0.24 of LPC1768
manants 0:bf25fa7f7ff8 134 chan=1;
manants 0:bf25fa7f7ff8 135 break;
manants 0:bf25fa7f7ff8 136 case p17://=p0.25 of LPC1768
manants 0:bf25fa7f7ff8 137 chan=2;
manants 0:bf25fa7f7ff8 138 break;
manants 0:bf25fa7f7ff8 139 case p18://=p0.26 of LPC1768
manants 0:bf25fa7f7ff8 140 chan=3;
manants 0:bf25fa7f7ff8 141 break;
manants 0:bf25fa7f7ff8 142 case p19://=p1.30 of LPC1768
manants 0:bf25fa7f7ff8 143 chan=4;
manants 0:bf25fa7f7ff8 144 break;
manants 0:bf25fa7f7ff8 145 case p20://=p1.31 of LPC1768
manants 0:bf25fa7f7ff8 146 chan=5;
manants 0:bf25fa7f7ff8 147 break;
manants 0:bf25fa7f7ff8 148 }
manants 0:bf25fa7f7ff8 149 return(chan);
manants 0:bf25fa7f7ff8 150 }
manants 0:bf25fa7f7ff8 151
manants 0:bf25fa7f7ff8 152 PinName ADC::channel_to_pin(int chan) {
manants 0:bf25fa7f7ff8 153 const PinName pin[8]={p15, p16, p17, p18, p19, p20, p15, p15};
manants 0:bf25fa7f7ff8 154
manants 0:bf25fa7f7ff8 155 if ((chan < 0) || (chan > 5))
manants 0:bf25fa7f7ff8 156 fprintf(stderr, "ADC channel %u is outside range available to MBED pins.\n", chan);
manants 0:bf25fa7f7ff8 157 return(pin[chan & 0x07]);
manants 0:bf25fa7f7ff8 158 }
manants 0:bf25fa7f7ff8 159
manants 0:bf25fa7f7ff8 160
manants 0:bf25fa7f7ff8 161 int ADC::channel_to_pin_number(int chan) {
manants 0:bf25fa7f7ff8 162 const int pin[8]={15, 16, 17, 18, 19, 20, 0, 0};
manants 0:bf25fa7f7ff8 163
manants 0:bf25fa7f7ff8 164 if ((chan < 0) || (chan > 5))
manants 0:bf25fa7f7ff8 165 fprintf(stderr, "ADC channel %u is outside range available to MBED pins.\n", chan);
manants 0:bf25fa7f7ff8 166 return(pin[chan & 0x07]);
manants 0:bf25fa7f7ff8 167 }
manants 0:bf25fa7f7ff8 168
manants 0:bf25fa7f7ff8 169
manants 0:bf25fa7f7ff8 170 uint32_t ADC::_data_of_pin(PinName pin) {
manants 0:bf25fa7f7ff8 171 //If in burst mode and at least one interrupt enabled then
manants 0:bf25fa7f7ff8 172 //take all values from _adc_data
manants 0:bf25fa7f7ff8 173 if (burst() && (LPC_ADC->ADINTEN & 0x3F)) {
manants 0:bf25fa7f7ff8 174 return(_adc_data[_pin_to_channel(pin)]);
manants 0:bf25fa7f7ff8 175 } else {
manants 0:bf25fa7f7ff8 176 //Return current register value or last value from interrupt
manants 0:bf25fa7f7ff8 177 switch (pin) {
manants 0:bf25fa7f7ff8 178 case p15://=p0.23 of LPC1768
manants 0:bf25fa7f7ff8 179 default:
manants 0:bf25fa7f7ff8 180 return(LPC_ADC->ADINTEN & 0x01?_adc_data[0]:LPC_ADC->ADDR0);
manants 0:bf25fa7f7ff8 181 case p16://=p0.24 of LPC1768
manants 0:bf25fa7f7ff8 182 return(LPC_ADC->ADINTEN & 0x02?_adc_data[1]:LPC_ADC->ADDR1);
manants 0:bf25fa7f7ff8 183 case p17://=p0.25 of LPC1768
manants 0:bf25fa7f7ff8 184 return(LPC_ADC->ADINTEN & 0x04?_adc_data[2]:LPC_ADC->ADDR2);
manants 0:bf25fa7f7ff8 185 case p18://=p0.26 of LPC1768:
manants 0:bf25fa7f7ff8 186 return(LPC_ADC->ADINTEN & 0x08?_adc_data[3]:LPC_ADC->ADDR3);
manants 0:bf25fa7f7ff8 187 case p19://=p1.30 of LPC1768
manants 0:bf25fa7f7ff8 188 return(LPC_ADC->ADINTEN & 0x10?_adc_data[4]:LPC_ADC->ADDR4);
manants 0:bf25fa7f7ff8 189 case p20://=p1.31 of LPC1768
manants 0:bf25fa7f7ff8 190 return(LPC_ADC->ADINTEN & 0x20?_adc_data[5]:LPC_ADC->ADDR5);
manants 0:bf25fa7f7ff8 191 }
manants 0:bf25fa7f7ff8 192 }
manants 0:bf25fa7f7ff8 193 }
manants 0:bf25fa7f7ff8 194
manants 0:bf25fa7f7ff8 195 //Enable or disable an ADC pin
manants 0:bf25fa7f7ff8 196 void ADC::setup(PinName pin, int state) {
manants 0:bf25fa7f7ff8 197 int chan;
manants 0:bf25fa7f7ff8 198 chan=_pin_to_channel(pin);
manants 0:bf25fa7f7ff8 199 if ((state & 1) == 1) {
manants 0:bf25fa7f7ff8 200 switch(pin) {
manants 0:bf25fa7f7ff8 201 case p15://=p0.23 of LPC1768
manants 0:bf25fa7f7ff8 202 default:
manants 0:bf25fa7f7ff8 203 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 14);
manants 0:bf25fa7f7ff8 204 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 14;
manants 0:bf25fa7f7ff8 205 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 14);
manants 0:bf25fa7f7ff8 206 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 14;
manants 0:bf25fa7f7ff8 207 break;
manants 0:bf25fa7f7ff8 208 case p16://=p0.24 of LPC1768
manants 0:bf25fa7f7ff8 209 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 16);
manants 0:bf25fa7f7ff8 210 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 16;
manants 0:bf25fa7f7ff8 211 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 16);
manants 0:bf25fa7f7ff8 212 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 16;
manants 0:bf25fa7f7ff8 213 break;
manants 0:bf25fa7f7ff8 214 case p17://=p0.25 of LPC1768
manants 0:bf25fa7f7ff8 215 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 18);
manants 0:bf25fa7f7ff8 216 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 18;
manants 0:bf25fa7f7ff8 217 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 18);
manants 0:bf25fa7f7ff8 218 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 18;
manants 0:bf25fa7f7ff8 219 break;
manants 0:bf25fa7f7ff8 220 case p18://=p0.26 of LPC1768:
manants 0:bf25fa7f7ff8 221 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 20);
manants 0:bf25fa7f7ff8 222 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 20;
manants 0:bf25fa7f7ff8 223 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 20);
manants 0:bf25fa7f7ff8 224 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 20;
manants 0:bf25fa7f7ff8 225 break;
manants 0:bf25fa7f7ff8 226 case p19://=p1.30 of LPC1768
manants 0:bf25fa7f7ff8 227 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 28);
manants 0:bf25fa7f7ff8 228 LPC_PINCON->PINSEL3 |= (unsigned int)0x3 << 28;
manants 0:bf25fa7f7ff8 229 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 28);
manants 0:bf25fa7f7ff8 230 LPC_PINCON->PINMODE3 |= (unsigned int)0x2 << 28;
manants 0:bf25fa7f7ff8 231 break;
manants 0:bf25fa7f7ff8 232 case p20://=p1.31 of LPC1768
manants 0:bf25fa7f7ff8 233 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 30);
manants 0:bf25fa7f7ff8 234 LPC_PINCON->PINSEL3 |= (unsigned int)0x3 << 30;
manants 0:bf25fa7f7ff8 235 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 30);
manants 0:bf25fa7f7ff8 236 LPC_PINCON->PINMODE3 |= (unsigned int)0x2 << 30;
manants 0:bf25fa7f7ff8 237 break;
manants 0:bf25fa7f7ff8 238 }
manants 0:bf25fa7f7ff8 239 //Only one channel can be selected at a time if not in burst mode
manants 0:bf25fa7f7ff8 240 if (!burst()) LPC_ADC->ADCR &= ~0xFF;
manants 0:bf25fa7f7ff8 241 //Select channel
manants 0:bf25fa7f7ff8 242 LPC_ADC->ADCR |= (1 << chan);
manants 0:bf25fa7f7ff8 243 }
manants 0:bf25fa7f7ff8 244 else {
manants 0:bf25fa7f7ff8 245 switch(pin) {
manants 0:bf25fa7f7ff8 246 case p15://=p0.23 of LPC1768
manants 0:bf25fa7f7ff8 247 default:
manants 0:bf25fa7f7ff8 248 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 14);
manants 0:bf25fa7f7ff8 249 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 14);
manants 0:bf25fa7f7ff8 250 break;
manants 0:bf25fa7f7ff8 251 case p16://=p0.24 of LPC1768
manants 0:bf25fa7f7ff8 252 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 16);
manants 0:bf25fa7f7ff8 253 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 16);
manants 0:bf25fa7f7ff8 254 break;
manants 0:bf25fa7f7ff8 255 case p17://=p0.25 of LPC1768
manants 0:bf25fa7f7ff8 256 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 18);
manants 0:bf25fa7f7ff8 257 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 18);
manants 0:bf25fa7f7ff8 258 break;
manants 0:bf25fa7f7ff8 259 case p18://=p0.26 of LPC1768:
manants 0:bf25fa7f7ff8 260 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 20);
manants 0:bf25fa7f7ff8 261 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 20);
manants 0:bf25fa7f7ff8 262 break;
manants 0:bf25fa7f7ff8 263 case p19://=p1.30 of LPC1768
manants 0:bf25fa7f7ff8 264 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 28);
manants 0:bf25fa7f7ff8 265 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 28);
manants 0:bf25fa7f7ff8 266 break;
manants 0:bf25fa7f7ff8 267 case p20://=p1.31 of LPC1768
manants 0:bf25fa7f7ff8 268 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 30);
manants 0:bf25fa7f7ff8 269 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 30);
manants 0:bf25fa7f7ff8 270 break;
manants 0:bf25fa7f7ff8 271 }
manants 0:bf25fa7f7ff8 272 LPC_ADC->ADCR &= ~(1 << chan);
manants 0:bf25fa7f7ff8 273 }
manants 0:bf25fa7f7ff8 274 }
manants 0:bf25fa7f7ff8 275 //Return channel enabled/disabled state
manants 0:bf25fa7f7ff8 276 int ADC::setup(PinName pin) {
manants 0:bf25fa7f7ff8 277 int chan;
manants 0:bf25fa7f7ff8 278
manants 0:bf25fa7f7ff8 279 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 280 return((LPC_ADC->ADCR & (1 << chan)) >> chan);
manants 0:bf25fa7f7ff8 281 }
manants 0:bf25fa7f7ff8 282
manants 0:bf25fa7f7ff8 283 //Select channel already setup
manants 0:bf25fa7f7ff8 284 void ADC::select(PinName pin) {
manants 0:bf25fa7f7ff8 285 int chan;
manants 0:bf25fa7f7ff8 286
manants 0:bf25fa7f7ff8 287 //Only one channel can be selected at a time if not in burst mode
manants 0:bf25fa7f7ff8 288 if (!burst()) LPC_ADC->ADCR &= ~0xFF;
manants 0:bf25fa7f7ff8 289 //Select channel
manants 0:bf25fa7f7ff8 290 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 291 LPC_ADC->ADCR |= (1 << chan);
manants 0:bf25fa7f7ff8 292 }
manants 0:bf25fa7f7ff8 293
manants 0:bf25fa7f7ff8 294 //Enable or disable burst mode
manants 0:bf25fa7f7ff8 295 void ADC::burst(int state) {
manants 0:bf25fa7f7ff8 296 if ((state & 1) == 1) {
manants 0:bf25fa7f7ff8 297 if (startmode(0) != 0)
manants 0:bf25fa7f7ff8 298 fprintf(stderr, "Warning. startmode is %u. Must be 0 for burst mode.\n", startmode(0));
manants 0:bf25fa7f7ff8 299 LPC_ADC->ADCR |= (1 << 16);
manants 0:bf25fa7f7ff8 300 }
manants 0:bf25fa7f7ff8 301 else
manants 0:bf25fa7f7ff8 302 LPC_ADC->ADCR &= ~(1 << 16);
manants 0:bf25fa7f7ff8 303 }
manants 0:bf25fa7f7ff8 304 //Return burst mode state
manants 0:bf25fa7f7ff8 305 int ADC::burst(void) {
manants 0:bf25fa7f7ff8 306 return((LPC_ADC->ADCR & (1 << 16)) >> 16);
manants 0:bf25fa7f7ff8 307 }
manants 0:bf25fa7f7ff8 308
manants 0:bf25fa7f7ff8 309 //Set startmode and edge
manants 0:bf25fa7f7ff8 310 void ADC::startmode(int mode, int edge) {
manants 0:bf25fa7f7ff8 311 int lpc_adc_temp;
manants 0:bf25fa7f7ff8 312
manants 0:bf25fa7f7ff8 313 //Reset start mode and edge bit,
manants 0:bf25fa7f7ff8 314 lpc_adc_temp = LPC_ADC->ADCR & ~(0x0F << 24);
manants 0:bf25fa7f7ff8 315 //Write with new values
manants 0:bf25fa7f7ff8 316 lpc_adc_temp |= ((mode & 7) << 24) | ((edge & 1) << 27);
manants 0:bf25fa7f7ff8 317 LPC_ADC->ADCR = lpc_adc_temp;
manants 0:bf25fa7f7ff8 318 }
manants 0:bf25fa7f7ff8 319
manants 0:bf25fa7f7ff8 320 //Return startmode state according to mode_edge=0: mode and mode_edge=1: edge
manants 0:bf25fa7f7ff8 321 int ADC::startmode(int mode_edge){
manants 0:bf25fa7f7ff8 322 switch (mode_edge) {
manants 0:bf25fa7f7ff8 323 case 0:
manants 0:bf25fa7f7ff8 324 default:
manants 0:bf25fa7f7ff8 325 return((LPC_ADC->ADCR >> 24) & 0x07);
manants 0:bf25fa7f7ff8 326 case 1:
manants 0:bf25fa7f7ff8 327 return((LPC_ADC->ADCR >> 27) & 0x01);
manants 0:bf25fa7f7ff8 328 }
manants 0:bf25fa7f7ff8 329 }
manants 0:bf25fa7f7ff8 330
manants 0:bf25fa7f7ff8 331 //Start ADC conversion
manants 0:bf25fa7f7ff8 332 void ADC::start(void) {
manants 0:bf25fa7f7ff8 333 startmode(1,0);
manants 0:bf25fa7f7ff8 334 }
manants 0:bf25fa7f7ff8 335
manants 0:bf25fa7f7ff8 336
manants 0:bf25fa7f7ff8 337 //Set interrupt enable/disable for pin to state
manants 0:bf25fa7f7ff8 338 void ADC::interrupt_state(PinName pin, int state) {
manants 0:bf25fa7f7ff8 339 int chan;
manants 0:bf25fa7f7ff8 340
manants 0:bf25fa7f7ff8 341 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 342 if (state == 1) {
manants 0:bf25fa7f7ff8 343 LPC_ADC->ADINTEN &= ~0x100;
manants 0:bf25fa7f7ff8 344 LPC_ADC->ADINTEN |= 1 << chan;
manants 0:bf25fa7f7ff8 345 /* Enable the ADC Interrupt */
manants 0:bf25fa7f7ff8 346 NVIC_EnableIRQ(ADC_IRQn);
manants 0:bf25fa7f7ff8 347 } else {
manants 0:bf25fa7f7ff8 348 LPC_ADC->ADINTEN &= ~( 1 << chan );
manants 0:bf25fa7f7ff8 349 //Disable interrrupt if no active pins left
manants 0:bf25fa7f7ff8 350 if ((LPC_ADC->ADINTEN & 0xFF) == 0)
manants 0:bf25fa7f7ff8 351 NVIC_DisableIRQ(ADC_IRQn);
manants 0:bf25fa7f7ff8 352 }
manants 0:bf25fa7f7ff8 353 }
manants 0:bf25fa7f7ff8 354
manants 0:bf25fa7f7ff8 355 //Return enable/disable state of interrupt for pin
manants 0:bf25fa7f7ff8 356 int ADC::interrupt_state(PinName pin) {
manants 0:bf25fa7f7ff8 357 int chan;
manants 0:bf25fa7f7ff8 358
manants 0:bf25fa7f7ff8 359 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 360 return((LPC_ADC->ADINTEN >> chan) & 0x01);
manants 0:bf25fa7f7ff8 361 }
manants 0:bf25fa7f7ff8 362
manants 0:bf25fa7f7ff8 363
manants 0:bf25fa7f7ff8 364 //Attach custom interrupt handler replacing default
manants 0:bf25fa7f7ff8 365 void ADC::attach(void(*fptr)(void)) {
manants 0:bf25fa7f7ff8 366 //* Attach IRQ
manants 0:bf25fa7f7ff8 367 NVIC_SetVector(ADC_IRQn, (uint32_t)fptr);
manants 0:bf25fa7f7ff8 368 }
manants 0:bf25fa7f7ff8 369
manants 0:bf25fa7f7ff8 370 //Restore default interrupt handler
manants 0:bf25fa7f7ff8 371 void ADC::detach(void) {
manants 0:bf25fa7f7ff8 372 //* Attach IRQ
manants 0:bf25fa7f7ff8 373 instance = this;
manants 0:bf25fa7f7ff8 374 NVIC_SetVector(ADC_IRQn, (uint32_t)&_adcisr);
manants 0:bf25fa7f7ff8 375 }
manants 0:bf25fa7f7ff8 376
manants 0:bf25fa7f7ff8 377
manants 0:bf25fa7f7ff8 378 //Append interrupt handler for pin to function isr
manants 0:bf25fa7f7ff8 379 void ADC::append(PinName pin, void(*fptr)(uint32_t value)) {
manants 0:bf25fa7f7ff8 380 int chan;
manants 0:bf25fa7f7ff8 381
manants 0:bf25fa7f7ff8 382 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 383 _adc_isr[chan] = fptr;
manants 0:bf25fa7f7ff8 384 }
manants 0:bf25fa7f7ff8 385
manants 0:bf25fa7f7ff8 386 //Append interrupt handler for pin to function isr
manants 0:bf25fa7f7ff8 387 void ADC::unappend(PinName pin) {
manants 0:bf25fa7f7ff8 388 int chan;
manants 0:bf25fa7f7ff8 389
manants 0:bf25fa7f7ff8 390 chan = _pin_to_channel(pin);
manants 0:bf25fa7f7ff8 391 _adc_isr[chan] = NULL;
manants 0:bf25fa7f7ff8 392 }
manants 0:bf25fa7f7ff8 393
manants 0:bf25fa7f7ff8 394 //Unappend global interrupt handler to function isr
manants 0:bf25fa7f7ff8 395 void ADC::append(void(*fptr)(int chan, uint32_t value)) {
manants 0:bf25fa7f7ff8 396 _adc_g_isr = fptr;
manants 0:bf25fa7f7ff8 397 }
manants 0:bf25fa7f7ff8 398
manants 0:bf25fa7f7ff8 399 //Detach global interrupt handler to function isr
manants 0:bf25fa7f7ff8 400 void ADC::unappend() {
manants 0:bf25fa7f7ff8 401 _adc_g_isr = NULL;
manants 0:bf25fa7f7ff8 402 }
manants 0:bf25fa7f7ff8 403
manants 0:bf25fa7f7ff8 404 //Set ADC offset
manants 0:bf25fa7f7ff8 405 void offset(int offset) {
manants 0:bf25fa7f7ff8 406 LPC_ADC->ADTRM &= ~(0x07 << 4);
manants 0:bf25fa7f7ff8 407 LPC_ADC->ADTRM |= (offset & 0x07) << 4;
manants 0:bf25fa7f7ff8 408 }
manants 0:bf25fa7f7ff8 409
manants 0:bf25fa7f7ff8 410 //Return current ADC offset
manants 0:bf25fa7f7ff8 411 int offset(void) {
manants 0:bf25fa7f7ff8 412 return((LPC_ADC->ADTRM >> 4) & 0x07);
manants 0:bf25fa7f7ff8 413 }
manants 0:bf25fa7f7ff8 414
manants 0:bf25fa7f7ff8 415 //Return value of ADC on pin
manants 0:bf25fa7f7ff8 416 int ADC::read(PinName pin) {
manants 0:bf25fa7f7ff8 417 //Reset DONE and OVERRUN flags of interrupt handled ADC data
manants 0:bf25fa7f7ff8 418 _adc_data[_pin_to_channel(pin)] &= ~(((uint32_t)0x01 << 31) | ((uint32_t)0x01 << 30));
manants 0:bf25fa7f7ff8 419 //Return value
manants 0:bf25fa7f7ff8 420 return((_data_of_pin(pin) >> 4) & 0xFFF);
manants 0:bf25fa7f7ff8 421 }
manants 0:bf25fa7f7ff8 422
manants 0:bf25fa7f7ff8 423 //Return DONE flag of ADC on pin
manants 0:bf25fa7f7ff8 424 int ADC::done(PinName pin) {
manants 0:bf25fa7f7ff8 425 return((_data_of_pin(pin) >> 31) & 0x01);
manants 0:bf25fa7f7ff8 426 }
manants 0:bf25fa7f7ff8 427
manants 0:bf25fa7f7ff8 428 //Return OVERRUN flag of ADC on pin
manants 0:bf25fa7f7ff8 429 int ADC::overrun(PinName pin) {
manants 0:bf25fa7f7ff8 430 return((_data_of_pin(pin) >> 30) & 0x01);
manants 0:bf25fa7f7ff8 431 }
manants 0:bf25fa7f7ff8 432
manants 0:bf25fa7f7ff8 433 int ADC::actual_adc_clock(void) {
manants 0:bf25fa7f7ff8 434 return(_adc_clk_freq);
manants 0:bf25fa7f7ff8 435 }
manants 0:bf25fa7f7ff8 436
manants 0:bf25fa7f7ff8 437 int ADC::actual_sample_rate(void) {
manants 0:bf25fa7f7ff8 438 return(_adc_clk_freq / CLKS_PER_SAMPLE);
manants 0:bf25fa7f7ff8 439 }
manants 0:bf25fa7f7ff8 440