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added different ADC sampling examples for the LisaM v2 including:

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* simple polling of an injected channel
 * timer triggered sampling of an injected channel
 * timer triggered sampling and IRQ handling of an injected channel
 * timer triggered sampling and IRQ handling of 4 injected channels
This commit is contained in:
Stephen Dwyer
2012-10-05 11:40:21 -06:00
parent 9e77f8c361
commit bece4c30d3
12 changed files with 964 additions and 0 deletions
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27
examples/stm32/f1/lisa-m-2/adc_injec/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## 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/>.
##
BINARY = adc
# Comment the following line if you _don't_ have luftboot flashed!
LDFLAGS += -Wl,-Ttext=0x8002000
CFLAGS += -std=c99
LDSCRIPT = ../lisa-m.ld
include ../../Makefile.include

11
examples/stm32/f1/lisa-m-2/adc_injec/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is a simple polling example that sends the value read out from the
temperature sensor ADC channel of the STM32 to the USART2.
This example polls injected channels.
The terminal settings for the receiving device/PC are 115200 8n1.

174
examples/stm32/f1/lisa-m-2/adc_injec/adc_injec.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
* Copyright (C) 2012 Stephen Dwyer <dwyer.sc@gmail.com>
*
* 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/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/flash.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/stm32/f1/adc.h>
#include <libopencm3/stm32/usart.h>
void usart_setup(void)
{
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
/* Setup UART parameters. */
usart_set_baudrate(USART2, 115200);
usart_set_databits(USART2, 8);
usart_set_stopbits(USART2, USART_STOPBITS_1);
usart_set_mode(USART2, USART_MODE_TX_RX);
usart_set_parity(USART2, USART_PARITY_NONE);
usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART2);
}
void gpio_setup(void)
{
/* Enable GPIO clocks. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Setup the LEDs. */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
}
void adc_setup(void)
{
int i;
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
/* Make sure the ADC doesn't run during config. */
adc_off(ADC1);
/* We configure everything for one single injected conversion. */
adc_disable_scan_mode(ADC1);
adc_set_single_conversion_mode(ADC1);
/* We can only use discontinuous mode on either the regular OR injected channels, not both */
adc_disable_discontinous_mode_regular(ADC1);
adc_enable_discontinous_mode_injected(ADC1);
/* We want to start the injected conversion in software */
adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_JSWSTART);
adc_set_right_aligned(ADC1);
/* We want to read the temperature sensor, so we have to enable it. */
adc_enable_temperature_sensor(ADC1);
adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
adc_on(ADC1);
/* Wait for ADC starting up. */
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
adc_reset_calibration(ADC1);
while ((ADC_CR2(ADC1) & ADC_CR2_RSTCAL) != 0); //added this check
adc_calibration(ADC1);
while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0); //added this check
}
void my_usart_print_int(u32 usart, int value)
{
s8 i;
u8 nr_digits = 0;
char buffer[25];
if (value < 0) {
usart_send_blocking(usart, '-');
value = value * -1;
}
while (value > 0) {
buffer[nr_digits++] = "0123456789"[value % 10];
value /= 10;
}
for (i = (nr_digits - 1); i >= 0; i--) {
usart_send_blocking(usart, buffer[i]);
}
usart_send_blocking(usart, '\r');
}
int main(void)
{
u8 channel_array[16];
u16 temperature = 0;
rcc_clock_setup_in_hse_12mhz_out_72mhz();
gpio_setup();
usart_setup();
adc_setup();
gpio_set(GPIOA, GPIO8); /* LED1 on */
gpio_set(GPIOC, GPIO15); /* LED2 on */
/* Send a message on USART1. */
usart_send_blocking(USART2, 's');
usart_send_blocking(USART2, 't');
usart_send_blocking(USART2, 'm');
usart_send_blocking(USART2, '\r');
usart_send_blocking(USART2, '\n');
/* Select the channel we want to convert. 16=temperature_sensor. */
channel_array[0] = 16;
/* Set the injected sequence here, with number of channels */
adc_set_injected_sequence(ADC1, 1, channel_array);
/* Continously convert and poll the temperature ADC. */
while (1) {
/*
* If the ADC_CR2_ON bit is already set -> setting it another time
* starts a regular conversion. Injected conversion is started
* explicitly with the JSWSTART bit as an external trigger. It may
* also work by setting no regular channels and setting JAUTO to
* automatically convert the injected channels after the regular
* channels (of which there would be none). (Not tested.)
*/
adc_start_conversion_injected(ADC1);
/* Wait for end of conversion. */
while (!(ADC_SR(ADC1) & ADC_SR_JEOC));
ADC_SR(ADC2) &= ~ADC_SR_JEOC; //clear injected end of conversion
temperature = ADC_JDR1(ADC1); //get the result from ADC_JDR1 on ADC1 (only bottom 16bits)
/*
* That's actually not the real temperature - you have to compute it
* as described in the datasheet.
*/
my_usart_print_int(USART2, temperature);
gpio_toggle(GPIOA, GPIO8); /* LED2 on */
}
return 0;
}