stub adc on/off test code.

Needs a pot on PA0, should get the temperature input working as well.

4 files changed, 215 insertions, 0 deletions

diff --git a/tests/adc-power/Makefile.stm32f4-disco b/tests/adc-power/Makefile.stm32f4-disco
new file mode 100644
index 0000000..b592384
--- /dev/null
+++ b/tests/adc-power/Makefile.stm32f4-disco
@@ -0,0 +1,44 @@
+##
+## This file is part of the libopencm3 project.
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BOARD = stm32f4-disco
+PROJECT = adc-power-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../../shared
+
+CFILES = main-$(BOARD).c
+CFILES += adc-power.c
+CFILES += trace.c trace_stdio.c
+
+VPATH += $(SHARED_DIR)
+
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+
+OPENCM3_DIR=../../libopencm3/
+
+### This section can go to an arch shared rules eventually...
+LDSCRIPT = ../../../libopencm3/lib/stm32/f4/stm32f405x6.ld
+OPENCM3_LIB = opencm3_stm32f4
+OPENCM3_DEFS = -DSTM32F4
+FP_FLAGS ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
+ARCH_FLAGS = -mthumb -mcpu=cortex-m4 $(FP_FLAGS)
+#OOCD_INTERFACE = stlink-v2
+#OOCD_TARGET = stm32f4x
+OOCD_FILE = ../../openocd/openocd.stm32f4-disco.cfg
+
+include ../../rules.mk
diff --git a/tests/adc-power/adc-power.c b/tests/adc-power/adc-power.c
new file mode 100644
index 0000000..817671c
--- /dev/null
+++ b/tests/adc-power/adc-power.c
@@ -0,0 +1,94 @@
+/**
+ * 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]))
+
+
+void adc_power_init(void)
+{
+	/* Some basic ADC config, that we won't touch again */
+	rcc_periph_clock_enable(RCC_ADC1);
+	adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_28CYC);
+#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
+	adc_disable_scan_mode(ADC1);
+#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);
+}
+
+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);
+#if 0
+	uint8_t channels[2] = { 0, 1 };
+	adc_set_regular_sequence(ADC1, ARRAY_SIZE(channels), channels);
+	TIM_CNT(TIMER) = 0;
+	adc_start_conversion_regular(ADC1);
+	while (!adc_eoc(ADC1));
+	unsigned int v1 = adc_read_regular(ADC1);
+	while (!adc_eoc(ADC1));
+	unsigned int v2 = adc_read_regular(ADC1);
+	unsigned int tconv = TIM_CNT(TIMER);
+#else
+	TIM_CNT(TIMER) = 0;
+	unsigned int v1 = read_adc_naiive(0);
+	unsigned int v2 = read_adc_naiive(1);
+	unsigned int tconv = TIM_CNT(TIMER);
+#endif
+	
+	printf("ton: %u, tconv: %u, v1: %u, v2: %u\n", td, tconv, v1, v2);
+}
+
+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);
+}
\ No newline at end of file
diff --git a/tests/adc-power/adc-power.h b/tests/adc-power/adc-power.h
new file mode 100644
index 0000000..2775d1a
--- /dev/null
+++ b/tests/adc-power/adc-power.h
@@ -0,0 +1,25 @@
+/* 
+ * File:   adc-power.h
+ * Author: karlp
+ *
+ * Created on October 17, 2015, 12:19 AM
+ */
+
+#ifndef ADC_POWER_H
+#define	ADC_POWER_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+	void adc_power_init(void);
+	void adc_power_task_up(void);
+	void adc_power_task_down(void);
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* ADC_POWER_H */
+
diff --git a/tests/adc-power/main-stm32f4-disco.c b/tests/adc-power/main-stm32f4-disco.c
new file mode 100644
index 0000000..f02e610
--- /dev/null
+++ b/tests/adc-power/main-stm32f4-disco.c
@@ -0,0 +1,52 @@
+/*
+ * Oct 2015 Karl Palsson <karlp@tweak.net.au>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/adc.h>
+#include <libopencm3/stm32/dac.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/usart.h>
+
+#include "trace.h"
+#include "adc-power.h"
+
+#define LED_DISCO_GREEN_PORT GPIOD
+#define LED_DISCO_GREEN_PIN GPIO12
+
+int main(void)
+{
+	int i;
+	int j = 0;
+	rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
+	rcc_periph_clock_enable(RCC_GPIOD);
+	printf("hi guys!\n");
+	/* green led for ticking */
+	gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
+			LED_DISCO_GREEN_PIN);
+
+	rcc_periph_clock_enable(RCC_GPIOA);
+	gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0);
+	gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO1);
+
+	adc_power_init();
+	while (1) {
+		adc_power_task_up();
+		gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
+
+		for (i = 0; i < 0x1000000; i++) { /* Wait a bit. */
+			__asm__("NOP");
+		}
+		adc_power_task_down();
+		gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
+		for (i = 0; i < 0x1000000; i++) { /* Wait a bit. */
+			__asm__("NOP");
+		}
+	}
+
+	return 0;
+}