add adc support
This commit is contained in:
Mariano Alvira
parent
b2b18b37fc
commit
c27e96f1e9
138
lib/adc.c
Normal file
138
lib/adc.c
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/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of libmc1322x: see http://mc1322x.devl.org
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* for details.
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*
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*
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*/
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#include <stdint.h>
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#include "crm.h"
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#include "adc.h"
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#include "gpio-util.h"
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//#define ADC_CHANS_ENABLED 0x3F // channels 0-5 enabled
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//#define ADC_CHANS_ENABLED 0x7E // channels 1-6 enabled
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//#define ADC_CHANS_ENABLED (1 << 6) // only channel 6 enabled
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#define ADC_CHANS_ENABLED 0x1FF // all channels, including battery reference voltage
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//#define ADC_PRESCALE_VALUE 24 // divide by 24 for 1MHz.
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#define ADC_SAMPLE_FREQ 400 // Hz (minimum of ~366.21 Hz)
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#define ADC_PRESCALE_VALUE (REF_OSC / ADC_SAMPLE_FREQ)
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#define ADC_USE_TIMER 0
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#define ADC_USE_INTERRUPTS 0 // incomplete support
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uint16_t adc_reading[NUM_ADC_CHAN];
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void ADC_flush(void) {
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while(ADC->FIFO_STATUSbits.EMPTY == 0) ADC->FIFO_READ;
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}
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uint16_t ADC_READ(void) {
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while(ADC->FIFO_STATUSbits.EMPTY); // loop while empty
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return ADC->FIFO_READ; // upper 4 bits are channel number
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}
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void adc_service(void) {
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uint16_t value;
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uint8_t channel;
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while (ADC->FIFO_STATUSbits.EMPTY == 0) {
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value = ADC->FIFO_READ;
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channel = value >> 12;
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if (channel < NUM_ADC_CHAN) adc_reading[channel] = value & 0xFFF;
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}
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}
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void adc_init(void) {
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uint8_t n;
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ADC->CLOCK_DIVIDER = 80; // 300 KHz
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ADC->PRESCALE = ADC_PRESCALE_VALUE - 1; // divide by 24 for 1MHz.
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ADC->CONTROL = 1;
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// The ON-TIME must always be 10µs or greater - typical On-Time value = 0x000A (10dec)
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ADC->ON_TIME = 10;
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/*
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NOTE
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The ADC analog block requires 6 ADC_Clocks per conversion, and the
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ADC_Clock must 300kHz or less. With 6 clocks/conversion and a 33.33µs
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clock period:
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* The ADC convert time must always be 20µs or greater
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* If the ADC_Clock is a frequency lower than 300kHz, the convert time
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must always be 6 ADC_Clock periods or greater
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* For override mode, extend convert time to 40µs minimum or greater
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For the convert time:
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* This delay is a function of the Prescale Clock (typically 1 MHz)
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* The register must be initialized for proper operation
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* For a 20µs convert time with 1MHz, value = 0x0014 (20dec)
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* If convert time is insufficient, inaccurate sample data will result
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*/
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ADC->CONVERT_TIME = 1000000 / (115200 / 8) - 1;
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ADC->MODE = 0; // Automatic
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#if ADC_USE_INTERRUPTS
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ADC->FIFO_CONTROL = 7;
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#else
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ADC->FIFO_CONTROL = 0;
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#endif
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#if ADC_USE_TIMER
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ADC->SR_1_HIGH = 0x0000;
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ADC->SR_1_LOW = (REF_OSC / ADC_PRESCALE_VALUE) / (115200 / 8) + 1;
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#endif
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ADC->SEQ_1 = 0
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#if ADC_USE_TIMER
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| (1 << 15) // sequence based on Timer 1.
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#else
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| (0 << 15) // sequence based on convert time.
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#endif
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| ADC_CHANS_ENABLED;
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ADC->CONTROL = 0xF001
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//#if ADC_USE_TIMER
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| (1 << 1) // Timer 1 enable
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//#endif
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;
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ADC->OVERRIDE = (1 << 8);
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for (n=0; n<=8; n++) {
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if ((ADC_CHANS_ENABLED >> n) & 1) {
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gpio_select_function(30 + n, 1); // Function 1 = ADC
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gpio_set_pad_dir(30 + n, PAD_DIR_INPUT);
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}
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}
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}
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164
lib/include/adc.h
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164
lib/include/adc.h
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@ -0,0 +1,164 @@
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/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of libmc1322x: see http://mc1322x.devl.org
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* for details.
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*
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*
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*/
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#ifndef ADC_H
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#define ADC_H
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#include <stdint.h>
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#include "utils.h"
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/* ADC registers are all 16-bit wide with 16-bit access only */
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#define ADC_BASE (0x8000D000)
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/* Structure-based register definitions */
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struct ADC_struct {
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union {
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uint16_t COMP[8];
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struct {
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uint16_t COMP_0;
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uint16_t COMP_1;
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uint16_t COMP_2;
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uint16_t COMP_3;
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uint16_t COMP_4;
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uint16_t COMP_5;
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uint16_t COMP_6;
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uint16_t COMP_7;
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};
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};
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uint16_t BAT_COMP_OVER;
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uint16_t BAT_COMP_UNDER;
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union {
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uint16_t SEQ_1;
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struct ADC_SEQ_1 {
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uint16_t CH0:1;
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uint16_t CH1:1;
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uint16_t CH2:1;
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uint16_t CH3:1;
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uint16_t CH4:1;
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uint16_t CH5:1;
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uint16_t CH6:1;
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uint16_t CH7:1;
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uint16_t BATT:1;
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uint16_t :6;
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uint16_t SEQ_MODE:1;
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} SEQ_1bits;
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};
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union {
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uint16_t SEQ_2;
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struct ADC_SEQ_2 {
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uint16_t CH0:1;
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uint16_t CH1:1;
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uint16_t CH2:1;
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uint16_t CH3:1;
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uint16_t CH4:1;
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uint16_t CH5:1;
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uint16_t CH6:1;
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uint16_t CH7:1;
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uint16_t :7;
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uint16_t SEQ_MODE:1;
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} SEQ_2bits;
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};
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union {
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uint16_t CONTROL;
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struct ADC_CONTROL {
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uint16_t ON:1;
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uint16_t TIMER1_ON:1;
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uint16_t TIMER2_ON:1;
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uint16_t SOFT_RESET:1;
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uint16_t AD1_FREFHL_EN:1;
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uint16_t AD2_VREFHL_EN:1;
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uint16_t :6;
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uint16_t COMPARE_IRQ_MASK:1;
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uint16_t SEQ1_IRQ_MASK:1;
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uint16_t SEQ2_IRQ_MASK:1;
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uint16_t FIFO_IRQ_MASK:1;
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} CONTROLbits;
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};
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uint16_t TRIGGERS;
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uint16_t PRESCALE;
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uint16_t reserved1;
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uint16_t FIFO_READ;
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uint16_t FIFO_CONTROL;
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union {
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uint16_t FIFO_STATUS;
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struct ADC_FIFO_STATUS {
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uint16_t LEVEL:4;
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uint16_t FULL:1;
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uint16_t EMPTY:1;
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uint16_t :10;
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} FIFO_STATUSbits;
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};
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uint16_t reserved2[5];
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uint16_t SR_1_HIGH;
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uint16_t SR_1_LOW;
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uint16_t SR_2_HIGH;
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uint16_t SR_2_LOW;
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uint16_t ON_TIME;
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uint16_t CONVERT_TIME;
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uint16_t CLOCK_DIVIDER;
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uint16_t reserved3;
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union {
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uint16_t OVERRIDE;
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struct ADC_OVERRIDE {
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uint16_t MUX1:4;
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uint16_t MUX2:4;
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uint16_t AD1_ON:1;
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uint16_t AD2_ON:1;
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uint16_t :6;
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} OVERRIDEbits;
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};
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uint16_t IRQ;
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uint16_t MODE;
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uint16_t RESULT_1;
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uint16_t RESULT_2;
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};
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static volatile struct ADC_struct * const ADC = (void *) (ADC_BASE);
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#define NUM_ADC_CHAN 9
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#define adc_enable() (ADC->CONTROLbits.ON = 1)
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#define adc_disable() (ADC->CONTROLbits.ON = 0)
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#define adc_select_channels(chans) (ADC->SEQ_1 = (ADC->SEQ_1 & 0xFE00) | chans)
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extern uint16_t adc_reading[NUM_ADC_CHAN];
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void ADC_flush(void);
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uint16_t ADC_READ(void);
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void read_scanners(void);
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void adc_init(void);
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void adc_service(void);
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#endif
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@ -121,8 +121,8 @@ enum {
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#define LFSR 6 /* 1 use polynomial for Turbolink */
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#define TM 5
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#define MODE 3
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#define MODE_MASK bit_mask(2,MODE)
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#define MACA_MODE 3
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#define MODE_MASK bit_mask(2,MACA_MODE)
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#define NO_CCA 0
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#define NO_SLOT_CCA 1
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#define SLOT_CCA 2
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@ -184,7 +184,7 @@ void maca_init(void) {
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/* nop, promiscuous, no cca */
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*MACA_CONTROL =
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(prm_mode << PRM) |
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(NO_CCA << MODE);
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(NO_CCA << MACA_MODE);
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enable_irq(MACA);
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*INTFRC = (1 << INT_NUM_MACA);
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63
tests/adc.c
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63
tests/adc.c
Normal file
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@ -0,0 +1,63 @@
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/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
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||||
* notice, this list of conditions and the following disclaimer.
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||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
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||||
* 3. Neither the name of the Institute nor the names of its contributors
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||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
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||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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||||
*
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* This file is part of libmc1322x: see http://mc1322x.devl.org
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* for details.
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*
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*
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*/
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#include <mc1322x.h>
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#include <board.h>
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#include <stdio.h>
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#include "config.h"
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#include "adc.h"
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int main(void)
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{
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uint8_t c;
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trim_xtal();
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uart1_init(INC,MOD,SAMP);
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adc_init();
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printf("adc test\r\n");
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printf("\x1B[2J"); // clear screen
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for(;;) {
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printf("\x1B[H"); // cursor home
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printf("# Value\r\n");
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for (c=0; c<NUM_ADC_CHAN; c++) {
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adc_service();
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printf("%u %04u\r\n", c, adc_reading[c]);
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}
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}
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}
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