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/**
* Testing ADC power up and power down, for timing and actual on/off
* Uses TIM6, because DWT_CYCCNT not available on cm0(+) :(
* (And with no DWT, no ITM timestamping either, get a real mcu!)
*/
#include <stdio.h>
#include <stdint.h>
#include <libopencm3/stm32/adc.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/timer.h>
#include "adc-power.h"
/* Everyone has tim6 right? */
#define TIMER TIM6
#define TIMER_RCC RCC_TIM6
// TODO - stick this in libopencm3?
#define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
// Still have some bad shit to deal with...
#if defined(STM32F0)
#define SEPARATE_ADC_SAMPLING 0
#define SAMPLE_TIME_BASIC ADC_SMPR_SMP_239DOT5 // 4usec or more for tempsensor
#elif defined(STM32F3)
#define SAMPLE_TIME_BASIC ADC_SMPR_SMP_181DOT5CYC
#define SAMPLE_TIME_TEMP ADC_SMPR_SMP_601DOT5CYC // 2.2usecs or more
#define SAMPLE_TIME_VREF SAMPLE_TIME_TEMP
#elif defined(STM32F4)
#define SAMPLE_TIME_BASIC ADC_SMPR_SMP_28CYC
#define SAMPLE_TIME_TEMP ADC_SMPR_SMP_144CYC // 10 usecs or more, in theory needs 840cycles!
#define SAMPLE_TIME_VREF SAMPLE_TIME_TEMP
#define ADC_CHANNEL_TEMP ADC_CHANNEL_TEMP_F40
#define SEPARATE_VREF 0
#elif defined(STM32L1)
#define SAMPLE_TIME_BASIC ADC_SMPR_SMP_24CYC
#define SAMPLE_TIME_TEMP ADC_SMPR_SMP_192CYC
#define SAMPLE_TIME_VREF SAMPLE_TIME_TEMP
#define SEPARATE_VREF 0
#elif defined(STM32L4)
#define SAMPLE_TIME_BASIC ADC_SMPR_SMP_247DOT5CYC
#define SAMPLE_TIME_TEMP ADC_SMPR_SMP_247DOT5CYC
#define SAMPLE_TIME_VREF SAMPLE_TIME_TEMP
#else
#error "no sample time for your target yet?!"
#endif
#ifndef SEPARATE_VREF
#define SEPARATE_VREF 1
#endif
#ifndef SEPARATE_ADC_SAMPLING
#define SEPARATE_ADC_SAMPLING 1
#endif
void adc_power_init(void)
{
/* Some basic ADC config, that we won't touch again */
#if defined(STM32F3)
/* silly f303 */
rcc_periph_clock_enable(RCC_ADC12);
rcc_adc_prescale(RCC_CFGR2_ADCxPRES_PLL_CLK_DIV_1, RCC_CFGR2_ADCxPRES_PLL_CLK_DIV_1);
adc_enable_regulator(ADC1);
#elif defined (STM32L4)
/* same same but different */
rcc_periph_clock_enable(RCC_ADC1);
ADC_CR(ADC1) &= ~ADC_CR_DEEPPWD;
RCC_CCIPR |= 3 << 28; // system clock as adc clock. (with CKMODE == 0)
adc_enable_regulator(ADC1);
ADC_CR(ADC1) &= ~ADC_CR_ADCALDIF;
ADC_CR(ADC1) |= ADC_CR_ADCAL;
while (ADC_CR(ADC1) & ADC_CR_ADCAL);
#else
rcc_periph_clock_enable(RCC_ADC1);
#if 0
// DANGER DANGER! doing this without DMA is dum.
// but... we're busy polling, we should be right... right?
// (dma across platforms is teh suck)
adc_enable_scan_mode(ADC1);
ADC_CR2 |= ADC_CR2_EOCS; // FIXME
#else
// FIXME - f0! adc_disable_scan_mode(ADC1);
#endif
#endif
#if (SEPARATE_ADC_SAMPLING == 1)
adc_set_sample_time_on_all_channels(ADC1, SAMPLE_TIME_BASIC);
adc_set_sample_time(ADC1, ADC_CHANNEL_TEMP, SAMPLE_TIME_TEMP);
adc_set_sample_time(ADC1, ADC_CHANNEL_TEMP, SAMPLE_TIME_VREF);
#else
adc_set_sample_time_on_all_channels(ADC1, SAMPLE_TIME_BASIC);
#endif
adc_enable_temperature_sensor();
#if (SEPARATE_VREF == 1)
adc_enable_vrefint();
#endif
/*
* We're going to setup a timer to run at top speed, so... "fast"
* but we don't actually care about the rate itself. We just
* want to collect how many ticks it takes to enable and disable
* the adc.
*/
rcc_periph_clock_enable(TIMER_RCC);
timer_reset(TIMER);
timer_set_prescaler(TIMER, 0);
timer_enable_counter(TIMER);
}
static uint16_t read_adc_naiive(uint8_t channel)
{
uint8_t channel_array[16];
channel_array[0] = channel;
adc_set_regular_sequence(ADC1, 1, channel_array);
adc_start_conversion_regular(ADC1);
while (!adc_eoc(ADC1));
return adc_read_regular(ADC1);
}
static float adc_calc_tempf(unsigned int ts_v, unsigned int vref) {
float adjusted_vtemp = ts_v * ST_VREFINT_CAL * 1.0f / vref * 1.0f;
float slope = (110-30) * 1.0f / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C) * 1.0f;
return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;
}
static int adc_calc_tempi(unsigned int ts, unsigned int vref) {
int adjusted_vtemp = ts * ST_VREFINT_CAL / vref;
int slope = (110-30) / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C);
return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;
}
void adc_power_task_up(void) {
TIM_CNT(TIMER) = 0;
adc_power_on(ADC1);
unsigned int td = TIM_CNT(TIMER);
/* just for kicks, let's time some sequences too....
* I mean, we're going to do some conversions right? */
adc_set_single_conversion_mode(ADC1);
TIM_CNT(TIMER) = 0;
unsigned int v1 = read_adc_naiive(1); // 8 for l4!
unsigned int v5 = read_adc_naiive(5);
unsigned int temp_adc = read_adc_naiive(ADC_CHANNEL_TEMP);
unsigned int vref_adc = read_adc_naiive(ADC_CHANNEL_VREF);
unsigned int tconv = TIM_CNT(TIMER);
TIM_CNT(TIMER) = 0;
float tempf = adc_calc_tempf(temp_adc, vref_adc);
int tconvf = TIM_CNT(TIMER);
TIM_CNT(TIMER) = 0;
int tempi = adc_calc_tempi(temp_adc, vref_adc);
int tconvi = TIM_CNT(TIMER);
printf("ton: %u, tconv: %u, ch1: %u, ch5: %u\n", td, tconv, v1, v5);
printf("\tTemperature: %f (tc %d) or %d (tc %d) (raw ts: %d, raw vref: %d)\n",
tempf, tconvf, tempi, tconvi, temp_adc, vref_adc);
//printf("\tT1-30 %d, t2-110 %d, vrefcal: %d\n", ST_TSENSE_CAL1_30C, ST_TSENSE_CAL2_110C, ST_VREFINT_CAL);
}
void adc_power_task_down()
{
TIM_CNT(TIMER) = 0;
adc_power_off(ADC1);
unsigned int td = TIM_CNT(TIMER);
printf("toff in: %u\n", td);
}
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