Bender Robotics / Mbed 2 deprecated PLAUCI_full

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Dependencies:   FatFileSystemCpp mbed PowerControl USBHostLite

ADC_full/adc.cpp@0:16fd37cf4a7c, 2015-02-13 (annotated)

Committer:
jkaderka
Date:
Fri Feb 13 08:20:27 2015 +0000
Revision:
0:16fd37cf4a7c
first version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jkaderka 0:16fd37cf4a7c 1 /* mbed Library - ADC
jkaderka 0:16fd37cf4a7c 2 * Copyright (c) 2010, sblandford
jkaderka 0:16fd37cf4a7c 3 * released under MIT license http://mbed.org/licence/mit
jkaderka 0:16fd37cf4a7c 4 */
jkaderka 0:16fd37cf4a7c 5 #include "mbed.h"
jkaderka 0:16fd37cf4a7c 6 #include "adc.h"
jkaderka 0:16fd37cf4a7c 7
jkaderka 0:16fd37cf4a7c 8
jkaderka 0:16fd37cf4a7c 9 ADC *ADC::instance;
jkaderka 0:16fd37cf4a7c 10
jkaderka 0:16fd37cf4a7c 11 ADC::ADC(int sample_rate, int cclk_div)
jkaderka 0:16fd37cf4a7c 12 {
jkaderka 0:16fd37cf4a7c 13
jkaderka 0:16fd37cf4a7c 14 int i, adc_clk_freq, pclk, clock_div, max_div=1;
jkaderka 0:16fd37cf4a7c 15
jkaderka 0:16fd37cf4a7c 16 //Work out CCLK
jkaderka 0:16fd37cf4a7c 17 adc_clk_freq=CLKS_PER_SAMPLE*sample_rate;
jkaderka 0:16fd37cf4a7c 18 int m = (LPC_SC->PLL0CFG & 0xFFFF) + 1;
jkaderka 0:16fd37cf4a7c 19 int n = (LPC_SC->PLL0CFG >> 16) + 1;
jkaderka 0:16fd37cf4a7c 20 int cclkdiv = LPC_SC->CCLKCFG + 1;
jkaderka 0:16fd37cf4a7c 21 int Fcco = (2 * m * XTAL_FREQ) / n;
jkaderka 0:16fd37cf4a7c 22 int cclk = Fcco / cclkdiv;
jkaderka 0:16fd37cf4a7c 23
jkaderka 0:16fd37cf4a7c 24 //Power up the ADC
jkaderka 0:16fd37cf4a7c 25 LPC_SC->PCONP |= (1 << 12);
jkaderka 0:16fd37cf4a7c 26 //Set clock at cclk / 1.
jkaderka 0:16fd37cf4a7c 27 LPC_SC->PCLKSEL0 &= ~(0x3 << 24);
jkaderka 0:16fd37cf4a7c 28 switch (cclk_div) {
jkaderka 0:16fd37cf4a7c 29 case 1:
jkaderka 0:16fd37cf4a7c 30 LPC_SC->PCLKSEL0 |= 0x1 << 24;
jkaderka 0:16fd37cf4a7c 31 break;
jkaderka 0:16fd37cf4a7c 32 case 2:
jkaderka 0:16fd37cf4a7c 33 LPC_SC->PCLKSEL0 |= 0x2 << 24;
jkaderka 0:16fd37cf4a7c 34 break;
jkaderka 0:16fd37cf4a7c 35 case 4:
jkaderka 0:16fd37cf4a7c 36 LPC_SC->PCLKSEL0 |= 0x0 << 24;
jkaderka 0:16fd37cf4a7c 37 break;
jkaderka 0:16fd37cf4a7c 38 case 8:
jkaderka 0:16fd37cf4a7c 39 LPC_SC->PCLKSEL0 |= 0x3 << 24;
jkaderka 0:16fd37cf4a7c 40 break;
jkaderka 0:16fd37cf4a7c 41 default:
jkaderka 0:16fd37cf4a7c 42 fprintf(stderr, "Warning: ADC CCLK clock divider must be 1, 2, 4 or 8. %u supplied.\n",
jkaderka 0:16fd37cf4a7c 43 cclk_div);
jkaderka 0:16fd37cf4a7c 44 fprintf(stderr, "Defaulting to 1.\n");
jkaderka 0:16fd37cf4a7c 45 LPC_SC->PCLKSEL0 |= 0x1 << 24;
jkaderka 0:16fd37cf4a7c 46 break;
jkaderka 0:16fd37cf4a7c 47 }
jkaderka 0:16fd37cf4a7c 48 pclk = cclk / cclk_div;
jkaderka 0:16fd37cf4a7c 49 clock_div=pclk / adc_clk_freq;
jkaderka 0:16fd37cf4a7c 50
jkaderka 0:16fd37cf4a7c 51 if (clock_div > 0xFF) {
jkaderka 0:16fd37cf4a7c 52 fprintf(stderr, "Warning: Clock division is %u which is above 255 limit. Re-Setting at limit.\n",
jkaderka 0:16fd37cf4a7c 53 clock_div);
jkaderka 0:16fd37cf4a7c 54 clock_div=0xFF;
jkaderka 0:16fd37cf4a7c 55 }
jkaderka 0:16fd37cf4a7c 56 if (clock_div == 0) {
jkaderka 0:16fd37cf4a7c 57 fprintf(stderr, "Warning: Clock division is 0. Re-Setting to 1.\n");
jkaderka 0:16fd37cf4a7c 58 clock_div=1;
jkaderka 0:16fd37cf4a7c 59 }
jkaderka 0:16fd37cf4a7c 60
jkaderka 0:16fd37cf4a7c 61 _adc_clk_freq=pclk / clock_div;
jkaderka 0:16fd37cf4a7c 62 if (_adc_clk_freq > MAX_ADC_CLOCK) {
jkaderka 0:16fd37cf4a7c 63 fprintf(stderr, "Warning: Actual ADC sample rate of %u which is above %u limit\n",
jkaderka 0:16fd37cf4a7c 64 _adc_clk_freq / CLKS_PER_SAMPLE, MAX_ADC_CLOCK / CLKS_PER_SAMPLE);
jkaderka 0:16fd37cf4a7c 65 while ((pclk / max_div) > MAX_ADC_CLOCK) max_div++;
jkaderka 0:16fd37cf4a7c 66 fprintf(stderr, "Maximum recommended sample rate is %u\n", (pclk / max_div) / CLKS_PER_SAMPLE);
jkaderka 0:16fd37cf4a7c 67 }
jkaderka 0:16fd37cf4a7c 68
jkaderka 0:16fd37cf4a7c 69 LPC_ADC->ADCR =
jkaderka 0:16fd37cf4a7c 70 ((clock_div - 1 ) << 8 ) | //Clkdiv
jkaderka 0:16fd37cf4a7c 71 ( 1 << 21 ); //A/D operational
jkaderka 0:16fd37cf4a7c 72
jkaderka 0:16fd37cf4a7c 73 //Default no channels enabled
jkaderka 0:16fd37cf4a7c 74 LPC_ADC->ADCR &= ~0xFF;
jkaderka 0:16fd37cf4a7c 75 //Default NULL global custom isr
jkaderka 0:16fd37cf4a7c 76 _adc_g_isr = NULL;
jkaderka 0:16fd37cf4a7c 77 //Initialize arrays
jkaderka 0:16fd37cf4a7c 78 for (i=7; i>=0; i--) {
jkaderka 0:16fd37cf4a7c 79 _adc_data[i] = 0;
jkaderka 0:16fd37cf4a7c 80 _adc_isr[i] = NULL;
jkaderka 0:16fd37cf4a7c 81 }
jkaderka 0:16fd37cf4a7c 82
jkaderka 0:16fd37cf4a7c 83
jkaderka 0:16fd37cf4a7c 84 //* Attach IRQ
jkaderka 0:16fd37cf4a7c 85 instance = this;
jkaderka 0:16fd37cf4a7c 86 NVIC_SetVector(ADC_IRQn, (uint32_t)&_adcisr);
jkaderka 0:16fd37cf4a7c 87
jkaderka 0:16fd37cf4a7c 88 //Disable global interrupt
jkaderka 0:16fd37cf4a7c 89 LPC_ADC->ADINTEN &= ~0x100;
jkaderka 0:16fd37cf4a7c 90
jkaderka 0:16fd37cf4a7c 91 };
jkaderka 0:16fd37cf4a7c 92
jkaderka 0:16fd37cf4a7c 93 void ADC::_adcisr(void)
jkaderka 0:16fd37cf4a7c 94 {
jkaderka 0:16fd37cf4a7c 95 instance->adcisr();
jkaderka 0:16fd37cf4a7c 96 }
jkaderka 0:16fd37cf4a7c 97
jkaderka 0:16fd37cf4a7c 98
jkaderka 0:16fd37cf4a7c 99 void ADC::adcisr(void)
jkaderka 0:16fd37cf4a7c 100 {
jkaderka 0:16fd37cf4a7c 101 uint32_t stat;
jkaderka 0:16fd37cf4a7c 102 int chan;
jkaderka 0:16fd37cf4a7c 103
jkaderka 0:16fd37cf4a7c 104 // Read status
jkaderka 0:16fd37cf4a7c 105 stat = LPC_ADC->ADSTAT;
jkaderka 0:16fd37cf4a7c 106 //Scan channels for over-run or done and update array
jkaderka 0:16fd37cf4a7c 107 if (stat & 0x0101) _adc_data[0] = LPC_ADC->ADDR0;
jkaderka 0:16fd37cf4a7c 108 if (stat & 0x0202) _adc_data[1] = LPC_ADC->ADDR1;
jkaderka 0:16fd37cf4a7c 109 if (stat & 0x0404) _adc_data[2] = LPC_ADC->ADDR2;
jkaderka 0:16fd37cf4a7c 110 if (stat & 0x0808) _adc_data[3] = LPC_ADC->ADDR3;
jkaderka 0:16fd37cf4a7c 111 if (stat & 0x1010) _adc_data[4] = LPC_ADC->ADDR4;
jkaderka 0:16fd37cf4a7c 112 if (stat & 0x2020) _adc_data[5] = LPC_ADC->ADDR5;
jkaderka 0:16fd37cf4a7c 113 if (stat & 0x4040) _adc_data[6] = LPC_ADC->ADDR6;
jkaderka 0:16fd37cf4a7c 114 if (stat & 0x8080) _adc_data[7] = LPC_ADC->ADDR7;
jkaderka 0:16fd37cf4a7c 115
jkaderka 0:16fd37cf4a7c 116 // Channel that triggered interrupt
jkaderka 0:16fd37cf4a7c 117 chan = (LPC_ADC->ADGDR >> 24) & 0x07;
jkaderka 0:16fd37cf4a7c 118 //User defined interrupt handlers
jkaderka 0:16fd37cf4a7c 119 if (_adc_isr[chan] != NULL)
jkaderka 0:16fd37cf4a7c 120 _adc_isr[chan](_adc_data[chan]);
jkaderka 0:16fd37cf4a7c 121 if (_adc_g_isr != NULL)
jkaderka 0:16fd37cf4a7c 122 _adc_g_isr(chan, _adc_data[chan]);
jkaderka 0:16fd37cf4a7c 123 return;
jkaderka 0:16fd37cf4a7c 124 }
jkaderka 0:16fd37cf4a7c 125
jkaderka 0:16fd37cf4a7c 126 int ADC::_pin_to_channel(PinName pin) {
jkaderka 0:16fd37cf4a7c 127 int chan;
jkaderka 0:16fd37cf4a7c 128 switch (pin) {
jkaderka 0:16fd37cf4a7c 129 case p15://=p0.23 of LPC1768
jkaderka 0:16fd37cf4a7c 130 default:
jkaderka 0:16fd37cf4a7c 131 chan=0;
jkaderka 0:16fd37cf4a7c 132 break;
jkaderka 0:16fd37cf4a7c 133 case p16://=p0.24 of LPC1768
jkaderka 0:16fd37cf4a7c 134 chan=1;
jkaderka 0:16fd37cf4a7c 135 break;
jkaderka 0:16fd37cf4a7c 136 case p17://=p0.25 of LPC1768
jkaderka 0:16fd37cf4a7c 137 chan=2;
jkaderka 0:16fd37cf4a7c 138 break;
jkaderka 0:16fd37cf4a7c 139 case p18://=p0.26 of LPC1768
jkaderka 0:16fd37cf4a7c 140 chan=3;
jkaderka 0:16fd37cf4a7c 141 break;
jkaderka 0:16fd37cf4a7c 142 case p19://=p1.30 of LPC1768
jkaderka 0:16fd37cf4a7c 143 chan=4;
jkaderka 0:16fd37cf4a7c 144 break;
jkaderka 0:16fd37cf4a7c 145 case p20://=p1.31 of LPC1768
jkaderka 0:16fd37cf4a7c 146 chan=5;
jkaderka 0:16fd37cf4a7c 147 break;
jkaderka 0:16fd37cf4a7c 148 }
jkaderka 0:16fd37cf4a7c 149 return(chan);
jkaderka 0:16fd37cf4a7c 150 }
jkaderka 0:16fd37cf4a7c 151
jkaderka 0:16fd37cf4a7c 152 PinName ADC::channel_to_pin(int chan) {
jkaderka 0:16fd37cf4a7c 153 const PinName pin[8]={p15, p16, p17, p18, p19, p20, p15, p15};
jkaderka 0:16fd37cf4a7c 154
jkaderka 0:16fd37cf4a7c 155 if ((chan < 0) || (chan > 5))
jkaderka 0:16fd37cf4a7c 156 fprintf(stderr, "ADC channel %u is outside range available to MBED pins.\n", chan);
jkaderka 0:16fd37cf4a7c 157 return(pin[chan & 0x07]);
jkaderka 0:16fd37cf4a7c 158 }
jkaderka 0:16fd37cf4a7c 159
jkaderka 0:16fd37cf4a7c 160
jkaderka 0:16fd37cf4a7c 161 int ADC::channel_to_pin_number(int chan) {
jkaderka 0:16fd37cf4a7c 162 const int pin[8]={15, 16, 17, 18, 19, 20, 0, 0};
jkaderka 0:16fd37cf4a7c 163
jkaderka 0:16fd37cf4a7c 164 if ((chan < 0) || (chan > 5))
jkaderka 0:16fd37cf4a7c 165 fprintf(stderr, "ADC channel %u is outside range available to MBED pins.\n", chan);
jkaderka 0:16fd37cf4a7c 166 return(pin[chan & 0x07]);
jkaderka 0:16fd37cf4a7c 167 }
jkaderka 0:16fd37cf4a7c 168
jkaderka 0:16fd37cf4a7c 169
jkaderka 0:16fd37cf4a7c 170 uint32_t ADC::_data_of_pin(PinName pin) {
jkaderka 0:16fd37cf4a7c 171 //If in burst mode and at least one interrupt enabled then
jkaderka 0:16fd37cf4a7c 172 //take all values from _adc_data
jkaderka 0:16fd37cf4a7c 173 if (burst() && (LPC_ADC->ADINTEN & 0x3F)) {
jkaderka 0:16fd37cf4a7c 174 return(_adc_data[_pin_to_channel(pin)]);
jkaderka 0:16fd37cf4a7c 175 } else {
jkaderka 0:16fd37cf4a7c 176 //Return current register value or last value from interrupt
jkaderka 0:16fd37cf4a7c 177 switch (pin) {
jkaderka 0:16fd37cf4a7c 178 case p15://=p0.23 of LPC1768
jkaderka 0:16fd37cf4a7c 179 default:
jkaderka 0:16fd37cf4a7c 180 return(LPC_ADC->ADINTEN & 0x01?_adc_data[0]:LPC_ADC->ADDR0);
jkaderka 0:16fd37cf4a7c 181 case p16://=p0.24 of LPC1768
jkaderka 0:16fd37cf4a7c 182 return(LPC_ADC->ADINTEN & 0x02?_adc_data[1]:LPC_ADC->ADDR1);
jkaderka 0:16fd37cf4a7c 183 case p17://=p0.25 of LPC1768
jkaderka 0:16fd37cf4a7c 184 return(LPC_ADC->ADINTEN & 0x04?_adc_data[2]:LPC_ADC->ADDR2);
jkaderka 0:16fd37cf4a7c 185 case p18://=p0.26 of LPC1768:
jkaderka 0:16fd37cf4a7c 186 return(LPC_ADC->ADINTEN & 0x08?_adc_data[3]:LPC_ADC->ADDR3);
jkaderka 0:16fd37cf4a7c 187 case p19://=p1.30 of LPC1768
jkaderka 0:16fd37cf4a7c 188 return(LPC_ADC->ADINTEN & 0x10?_adc_data[4]:LPC_ADC->ADDR4);
jkaderka 0:16fd37cf4a7c 189 case p20://=p1.31 of LPC1768
jkaderka 0:16fd37cf4a7c 190 return(LPC_ADC->ADINTEN & 0x20?_adc_data[5]:LPC_ADC->ADDR5);
jkaderka 0:16fd37cf4a7c 191 }
jkaderka 0:16fd37cf4a7c 192 }
jkaderka 0:16fd37cf4a7c 193 }
jkaderka 0:16fd37cf4a7c 194
jkaderka 0:16fd37cf4a7c 195 //Enable or disable an ADC pin
jkaderka 0:16fd37cf4a7c 196 void ADC::setup(PinName pin, int state) {
jkaderka 0:16fd37cf4a7c 197 int chan;
jkaderka 0:16fd37cf4a7c 198 chan=_pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 199 if ((state & 1) == 1) {
jkaderka 0:16fd37cf4a7c 200 switch(pin) {
jkaderka 0:16fd37cf4a7c 201 case p15://=p0.23 of LPC1768
jkaderka 0:16fd37cf4a7c 202 default:
jkaderka 0:16fd37cf4a7c 203 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 14);
jkaderka 0:16fd37cf4a7c 204 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 14;
jkaderka 0:16fd37cf4a7c 205 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 14);
jkaderka 0:16fd37cf4a7c 206 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 14;
jkaderka 0:16fd37cf4a7c 207 break;
jkaderka 0:16fd37cf4a7c 208 case p16://=p0.24 of LPC1768
jkaderka 0:16fd37cf4a7c 209 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 16);
jkaderka 0:16fd37cf4a7c 210 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 16;
jkaderka 0:16fd37cf4a7c 211 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 16);
jkaderka 0:16fd37cf4a7c 212 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 16;
jkaderka 0:16fd37cf4a7c 213 break;
jkaderka 0:16fd37cf4a7c 214 case p17://=p0.25 of LPC1768
jkaderka 0:16fd37cf4a7c 215 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 18);
jkaderka 0:16fd37cf4a7c 216 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 18;
jkaderka 0:16fd37cf4a7c 217 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 18);
jkaderka 0:16fd37cf4a7c 218 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 18;
jkaderka 0:16fd37cf4a7c 219 break;
jkaderka 0:16fd37cf4a7c 220 case p18://=p0.26 of LPC1768:
jkaderka 0:16fd37cf4a7c 221 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 20);
jkaderka 0:16fd37cf4a7c 222 LPC_PINCON->PINSEL1 |= (unsigned int)0x1 << 20;
jkaderka 0:16fd37cf4a7c 223 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 20);
jkaderka 0:16fd37cf4a7c 224 LPC_PINCON->PINMODE1 |= (unsigned int)0x2 << 20;
jkaderka 0:16fd37cf4a7c 225 break;
jkaderka 0:16fd37cf4a7c 226 case p19://=p1.30 of LPC1768
jkaderka 0:16fd37cf4a7c 227 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 28);
jkaderka 0:16fd37cf4a7c 228 LPC_PINCON->PINSEL3 |= (unsigned int)0x3 << 28;
jkaderka 0:16fd37cf4a7c 229 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 28);
jkaderka 0:16fd37cf4a7c 230 LPC_PINCON->PINMODE3 |= (unsigned int)0x2 << 28;
jkaderka 0:16fd37cf4a7c 231 break;
jkaderka 0:16fd37cf4a7c 232 case p20://=p1.31 of LPC1768
jkaderka 0:16fd37cf4a7c 233 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 30);
jkaderka 0:16fd37cf4a7c 234 LPC_PINCON->PINSEL3 |= (unsigned int)0x3 << 30;
jkaderka 0:16fd37cf4a7c 235 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 30);
jkaderka 0:16fd37cf4a7c 236 LPC_PINCON->PINMODE3 |= (unsigned int)0x2 << 30;
jkaderka 0:16fd37cf4a7c 237 break;
jkaderka 0:16fd37cf4a7c 238 }
jkaderka 0:16fd37cf4a7c 239 //Only one channel can be selected at a time if not in burst mode
jkaderka 0:16fd37cf4a7c 240 if (!burst()) LPC_ADC->ADCR &= ~0xFF;
jkaderka 0:16fd37cf4a7c 241 //Select channel
jkaderka 0:16fd37cf4a7c 242 LPC_ADC->ADCR |= (1 << chan);
jkaderka 0:16fd37cf4a7c 243 }
jkaderka 0:16fd37cf4a7c 244 else {
jkaderka 0:16fd37cf4a7c 245 switch(pin) {
jkaderka 0:16fd37cf4a7c 246 case p15://=p0.23 of LPC1768
jkaderka 0:16fd37cf4a7c 247 default:
jkaderka 0:16fd37cf4a7c 248 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 14);
jkaderka 0:16fd37cf4a7c 249 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 14);
jkaderka 0:16fd37cf4a7c 250 break;
jkaderka 0:16fd37cf4a7c 251 case p16://=p0.24 of LPC1768
jkaderka 0:16fd37cf4a7c 252 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 16);
jkaderka 0:16fd37cf4a7c 253 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 16);
jkaderka 0:16fd37cf4a7c 254 break;
jkaderka 0:16fd37cf4a7c 255 case p17://=p0.25 of LPC1768
jkaderka 0:16fd37cf4a7c 256 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 18);
jkaderka 0:16fd37cf4a7c 257 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 18);
jkaderka 0:16fd37cf4a7c 258 break;
jkaderka 0:16fd37cf4a7c 259 case p18://=p0.26 of LPC1768:
jkaderka 0:16fd37cf4a7c 260 LPC_PINCON->PINSEL1 &= ~((unsigned int)0x3 << 20);
jkaderka 0:16fd37cf4a7c 261 LPC_PINCON->PINMODE1 &= ~((unsigned int)0x3 << 20);
jkaderka 0:16fd37cf4a7c 262 break;
jkaderka 0:16fd37cf4a7c 263 case p19://=p1.30 of LPC1768
jkaderka 0:16fd37cf4a7c 264 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 28);
jkaderka 0:16fd37cf4a7c 265 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 28);
jkaderka 0:16fd37cf4a7c 266 break;
jkaderka 0:16fd37cf4a7c 267 case p20://=p1.31 of LPC1768
jkaderka 0:16fd37cf4a7c 268 LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 30);
jkaderka 0:16fd37cf4a7c 269 LPC_PINCON->PINMODE3 &= ~((unsigned int)0x3 << 30);
jkaderka 0:16fd37cf4a7c 270 break;
jkaderka 0:16fd37cf4a7c 271 }
jkaderka 0:16fd37cf4a7c 272 LPC_ADC->ADCR &= ~(1 << chan);
jkaderka 0:16fd37cf4a7c 273 }
jkaderka 0:16fd37cf4a7c 274 }
jkaderka 0:16fd37cf4a7c 275 //Return channel enabled/disabled state
jkaderka 0:16fd37cf4a7c 276 int ADC::setup(PinName pin) {
jkaderka 0:16fd37cf4a7c 277 int chan;
jkaderka 0:16fd37cf4a7c 278
jkaderka 0:16fd37cf4a7c 279 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 280 return((LPC_ADC->ADCR & (1 << chan)) >> chan);
jkaderka 0:16fd37cf4a7c 281 }
jkaderka 0:16fd37cf4a7c 282
jkaderka 0:16fd37cf4a7c 283 //Select channel already setup
jkaderka 0:16fd37cf4a7c 284 void ADC::select(PinName pin) {
jkaderka 0:16fd37cf4a7c 285 int chan;
jkaderka 0:16fd37cf4a7c 286
jkaderka 0:16fd37cf4a7c 287 //Only one channel can be selected at a time if not in burst mode
jkaderka 0:16fd37cf4a7c 288 if (!burst()) LPC_ADC->ADCR &= ~0xFF;
jkaderka 0:16fd37cf4a7c 289 //Select channel
jkaderka 0:16fd37cf4a7c 290 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 291 LPC_ADC->ADCR |= (1 << chan);
jkaderka 0:16fd37cf4a7c 292 }
jkaderka 0:16fd37cf4a7c 293
jkaderka 0:16fd37cf4a7c 294 //Enable or disable burst mode
jkaderka 0:16fd37cf4a7c 295 void ADC::burst(int state) {
jkaderka 0:16fd37cf4a7c 296 if ((state & 1) == 1) {
jkaderka 0:16fd37cf4a7c 297 if (startmode(0) != 0)
jkaderka 0:16fd37cf4a7c 298 fprintf(stderr, "Warning. startmode is %u. Must be 0 for burst mode.\n", startmode(0));
jkaderka 0:16fd37cf4a7c 299 LPC_ADC->ADCR |= (1 << 16);
jkaderka 0:16fd37cf4a7c 300 }
jkaderka 0:16fd37cf4a7c 301 else
jkaderka 0:16fd37cf4a7c 302 LPC_ADC->ADCR &= ~(1 << 16);
jkaderka 0:16fd37cf4a7c 303 }
jkaderka 0:16fd37cf4a7c 304 //Return burst mode state
jkaderka 0:16fd37cf4a7c 305 int ADC::burst(void) {
jkaderka 0:16fd37cf4a7c 306 return((LPC_ADC->ADCR & (1 << 16)) >> 16);
jkaderka 0:16fd37cf4a7c 307 }
jkaderka 0:16fd37cf4a7c 308
jkaderka 0:16fd37cf4a7c 309 //Set startmode and edge
jkaderka 0:16fd37cf4a7c 310 void ADC::startmode(int mode, int edge) {
jkaderka 0:16fd37cf4a7c 311 int lpc_adc_temp;
jkaderka 0:16fd37cf4a7c 312
jkaderka 0:16fd37cf4a7c 313 //Reset start mode and edge bit,
jkaderka 0:16fd37cf4a7c 314 lpc_adc_temp = LPC_ADC->ADCR & ~(0x0F << 24);
jkaderka 0:16fd37cf4a7c 315 //Write with new values
jkaderka 0:16fd37cf4a7c 316 lpc_adc_temp |= ((mode & 7) << 24) | ((edge & 1) << 27);
jkaderka 0:16fd37cf4a7c 317 LPC_ADC->ADCR = lpc_adc_temp;
jkaderka 0:16fd37cf4a7c 318 }
jkaderka 0:16fd37cf4a7c 319
jkaderka 0:16fd37cf4a7c 320 //Return startmode state according to mode_edge=0: mode and mode_edge=1: edge
jkaderka 0:16fd37cf4a7c 321 int ADC::startmode(int mode_edge){
jkaderka 0:16fd37cf4a7c 322 switch (mode_edge) {
jkaderka 0:16fd37cf4a7c 323 case 0:
jkaderka 0:16fd37cf4a7c 324 default:
jkaderka 0:16fd37cf4a7c 325 return((LPC_ADC->ADCR >> 24) & 0x07);
jkaderka 0:16fd37cf4a7c 326 case 1:
jkaderka 0:16fd37cf4a7c 327 return((LPC_ADC->ADCR >> 27) & 0x01);
jkaderka 0:16fd37cf4a7c 328 }
jkaderka 0:16fd37cf4a7c 329 }
jkaderka 0:16fd37cf4a7c 330
jkaderka 0:16fd37cf4a7c 331 //Start ADC conversion
jkaderka 0:16fd37cf4a7c 332 void ADC::start(void) {
jkaderka 0:16fd37cf4a7c 333 startmode(1,0);
jkaderka 0:16fd37cf4a7c 334 }
jkaderka 0:16fd37cf4a7c 335
jkaderka 0:16fd37cf4a7c 336
jkaderka 0:16fd37cf4a7c 337 //Set interrupt enable/disable for pin to state
jkaderka 0:16fd37cf4a7c 338 void ADC::interrupt_state(PinName pin, int state) {
jkaderka 0:16fd37cf4a7c 339 int chan;
jkaderka 0:16fd37cf4a7c 340
jkaderka 0:16fd37cf4a7c 341 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 342 if (state == 1) {
jkaderka 0:16fd37cf4a7c 343 LPC_ADC->ADINTEN &= ~0x100;
jkaderka 0:16fd37cf4a7c 344 LPC_ADC->ADINTEN |= 1 << chan;
jkaderka 0:16fd37cf4a7c 345 /* Enable the ADC Interrupt */
jkaderka 0:16fd37cf4a7c 346 NVIC_EnableIRQ(ADC_IRQn);
jkaderka 0:16fd37cf4a7c 347 } else {
jkaderka 0:16fd37cf4a7c 348 LPC_ADC->ADINTEN &= ~( 1 << chan );
jkaderka 0:16fd37cf4a7c 349 //Disable interrrupt if no active pins left
jkaderka 0:16fd37cf4a7c 350 if ((LPC_ADC->ADINTEN & 0xFF) == 0)
jkaderka 0:16fd37cf4a7c 351 NVIC_DisableIRQ(ADC_IRQn);
jkaderka 0:16fd37cf4a7c 352 }
jkaderka 0:16fd37cf4a7c 353 }
jkaderka 0:16fd37cf4a7c 354
jkaderka 0:16fd37cf4a7c 355 //Return enable/disable state of interrupt for pin
jkaderka 0:16fd37cf4a7c 356 int ADC::interrupt_state(PinName pin) {
jkaderka 0:16fd37cf4a7c 357 int chan;
jkaderka 0:16fd37cf4a7c 358
jkaderka 0:16fd37cf4a7c 359 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 360 return((LPC_ADC->ADINTEN >> chan) & 0x01);
jkaderka 0:16fd37cf4a7c 361 }
jkaderka 0:16fd37cf4a7c 362
jkaderka 0:16fd37cf4a7c 363
jkaderka 0:16fd37cf4a7c 364 //Attach custom interrupt handler replacing default
jkaderka 0:16fd37cf4a7c 365 void ADC::attach(void(*fptr)(void)) {
jkaderka 0:16fd37cf4a7c 366 //* Attach IRQ
jkaderka 0:16fd37cf4a7c 367 NVIC_SetVector(ADC_IRQn, (uint32_t)fptr);
jkaderka 0:16fd37cf4a7c 368 }
jkaderka 0:16fd37cf4a7c 369
jkaderka 0:16fd37cf4a7c 370 //Restore default interrupt handler
jkaderka 0:16fd37cf4a7c 371 void ADC::detach(void) {
jkaderka 0:16fd37cf4a7c 372 //* Attach IRQ
jkaderka 0:16fd37cf4a7c 373 instance = this;
jkaderka 0:16fd37cf4a7c 374 NVIC_SetVector(ADC_IRQn, (uint32_t)&_adcisr);
jkaderka 0:16fd37cf4a7c 375 }
jkaderka 0:16fd37cf4a7c 376
jkaderka 0:16fd37cf4a7c 377
jkaderka 0:16fd37cf4a7c 378 //Append interrupt handler for pin to function isr
jkaderka 0:16fd37cf4a7c 379 void ADC::append(PinName pin, void(*fptr)(uint32_t value)) {
jkaderka 0:16fd37cf4a7c 380 int chan;
jkaderka 0:16fd37cf4a7c 381
jkaderka 0:16fd37cf4a7c 382 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 383 _adc_isr[chan] = fptr;
jkaderka 0:16fd37cf4a7c 384 }
jkaderka 0:16fd37cf4a7c 385
jkaderka 0:16fd37cf4a7c 386 //Append interrupt handler for pin to function isr
jkaderka 0:16fd37cf4a7c 387 void ADC::unappend(PinName pin) {
jkaderka 0:16fd37cf4a7c 388 int chan;
jkaderka 0:16fd37cf4a7c 389
jkaderka 0:16fd37cf4a7c 390 chan = _pin_to_channel(pin);
jkaderka 0:16fd37cf4a7c 391 _adc_isr[chan] = NULL;
jkaderka 0:16fd37cf4a7c 392 }
jkaderka 0:16fd37cf4a7c 393
jkaderka 0:16fd37cf4a7c 394 //Unappend global interrupt handler to function isr
jkaderka 0:16fd37cf4a7c 395 void ADC::append(void(*fptr)(int chan, uint32_t value)) {
jkaderka 0:16fd37cf4a7c 396 _adc_g_isr = fptr;
jkaderka 0:16fd37cf4a7c 397 }
jkaderka 0:16fd37cf4a7c 398
jkaderka 0:16fd37cf4a7c 399 //Detach global interrupt handler to function isr
jkaderka 0:16fd37cf4a7c 400 void ADC::unappend() {
jkaderka 0:16fd37cf4a7c 401 _adc_g_isr = NULL;
jkaderka 0:16fd37cf4a7c 402 }
jkaderka 0:16fd37cf4a7c 403
jkaderka 0:16fd37cf4a7c 404 //Set ADC offset
jkaderka 0:16fd37cf4a7c 405 void offset(int offset) {
jkaderka 0:16fd37cf4a7c 406 LPC_ADC->ADTRM &= ~(0x07 << 4);
jkaderka 0:16fd37cf4a7c 407 LPC_ADC->ADTRM |= (offset & 0x07) << 4;
jkaderka 0:16fd37cf4a7c 408 }
jkaderka 0:16fd37cf4a7c 409
jkaderka 0:16fd37cf4a7c 410 //Return current ADC offset
jkaderka 0:16fd37cf4a7c 411 int offset(void) {
jkaderka 0:16fd37cf4a7c 412 return((LPC_ADC->ADTRM >> 4) & 0x07);
jkaderka 0:16fd37cf4a7c 413 }
jkaderka 0:16fd37cf4a7c 414
jkaderka 0:16fd37cf4a7c 415 //Return value of ADC on pin
jkaderka 0:16fd37cf4a7c 416 int ADC::read(PinName pin) {
jkaderka 0:16fd37cf4a7c 417 //Reset DONE and OVERRUN flags of interrupt handled ADC data
jkaderka 0:16fd37cf4a7c 418 _adc_data[_pin_to_channel(pin)] &= ~(((uint32_t)0x01 << 31) | ((uint32_t)0x01 << 30));
jkaderka 0:16fd37cf4a7c 419 //Return value
jkaderka 0:16fd37cf4a7c 420 return((_data_of_pin(pin) >> 4) & 0xFFF);
jkaderka 0:16fd37cf4a7c 421 }
jkaderka 0:16fd37cf4a7c 422
jkaderka 0:16fd37cf4a7c 423 //Return DONE flag of ADC on pin
jkaderka 0:16fd37cf4a7c 424 int ADC::done(PinName pin) {
jkaderka 0:16fd37cf4a7c 425 return((_data_of_pin(pin) >> 31) & 0x01);
jkaderka 0:16fd37cf4a7c 426 }
jkaderka 0:16fd37cf4a7c 427
jkaderka 0:16fd37cf4a7c 428 //Return OVERRUN flag of ADC on pin
jkaderka 0:16fd37cf4a7c 429 int ADC::overrun(PinName pin) {
jkaderka 0:16fd37cf4a7c 430 return((_data_of_pin(pin) >> 30) & 0x01);
jkaderka 0:16fd37cf4a7c 431 }
jkaderka 0:16fd37cf4a7c 432
jkaderka 0:16fd37cf4a7c 433 int ADC::actual_adc_clock(void) {
jkaderka 0:16fd37cf4a7c 434 return(_adc_clk_freq);
jkaderka 0:16fd37cf4a7c 435 }
jkaderka 0:16fd37cf4a7c 436
jkaderka 0:16fd37cf4a7c 437 int ADC::actual_sample_rate(void) {
jkaderka 0:16fd37cf4a7c 438 return(_adc_clk_freq / CLKS_PER_SAMPLE);
jkaderka 0:16fd37cf4a7c 439 }