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[stm32f429i-discovery] Added adc-dac-printf example.

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This commit is contained in:
Piotr Esden-Tempski
2015-01-15 01:58:25 -08:00
parent 016923e654
commit 4f1db00763
3 changed files with 202 additions and 0 deletions
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24
examples/stm32/f4/stm32f429i-discovery/adc-dac-printf/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-dac-printf
LDSCRIPT = ../stm32f429i-discovery.ld
include ../../Makefile.include

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examples/stm32/f4/stm32f429i-discovery/adc-dac-printf/README Normal file
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Console on PA9 (tx only) 115200@8n1
* Prints the ADC value on PA0 (adc channel 0) on the console
* Echos half that ADC value out to DAC channel 2 on PA5
* Prints the ADC value of PA1 (adc channel 1) to the console.
Recommended wiring:
* pot or any resistor ladder to PA0
* jumper from PA5 to PA1
example output:
...
tick: 228: adc0= 3950, target adc1=1975, adc1=1979
tick: 229: adc0= 3949, target adc1=1974, adc1=1978
tick: 230: adc0= 3950, target adc1=1975, adc1=1979
tick: 231: adc0= 3949, target adc1=1974, adc1=1978
...

161
examples/stm32/f4/stm32f429i-discovery/adc-dac-printf/adc-dac-printf.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
*
* 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 <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>
#define LED_DISCO_GREEN_PORT GPIOG
#define LED_DISCO_GREEN_PIN GPIO13
#define USART_CONSOLE USART1
int _write(int file, char *ptr, int len);
static void clock_setup(void)
{
rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
/* Enable GPIOD clock for LED & USARTs. */
rcc_periph_clock_enable(RCC_GPIOG);
rcc_periph_clock_enable(RCC_GPIOA);
/* Enable clocks for USART2 and dac */
rcc_periph_clock_enable(RCC_USART1);
rcc_periph_clock_enable(RCC_DAC);
/* And ADC*/
rcc_periph_clock_enable(RCC_ADC1);
}
static void usart_setup(void)
{
/* Setup GPIO pins for USART1 transmit. */
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
/* Setup USART1 TX pin as alternate function. */
gpio_set_af(GPIOA, GPIO_AF7, GPIO9);
usart_set_baudrate(USART_CONSOLE, 115200);
usart_set_databits(USART_CONSOLE, 8);
usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
usart_set_mode(USART_CONSOLE, USART_MODE_TX);
usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART_CONSOLE);
}
/**
* Use USART_CONSOLE as a console.
* This is a syscall for newlib
* @param file
* @param ptr
* @param len
* @return
*/
int _write(int file, char *ptr, int len)
{
int i;
if (file == STDOUT_FILENO || file == STDERR_FILENO) {
for (i = 0; i < len; i++) {
if (ptr[i] == '\n') {
usart_send_blocking(USART_CONSOLE, '\r');
}
usart_send_blocking(USART_CONSOLE, ptr[i]);
}
return i;
}
errno = EIO;
return -1;
}
static void adc_setup(void)
{
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0);
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO1);
adc_off(ADC1);
adc_disable_scan_mode(ADC1);
adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_3CYC);
adc_power_on(ADC1);
}
static void dac_setup(void)
{
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO5);
dac_disable(CHANNEL_2);
dac_disable_waveform_generation(CHANNEL_2);
dac_enable(CHANNEL_2);
dac_set_trigger_source(DAC_CR_TSEL2_SW);
}
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));
uint16_t reg16 = adc_read_regular(ADC1);
return reg16;
}
int main(void)
{
int i;
int j = 0;
clock_setup();
usart_setup();
printf("hi guys!\n");
adc_setup();
dac_setup();
/* green led for ticking */
gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
LED_DISCO_GREEN_PIN);
while (1) {
uint16_t input_adc0 = read_adc_naiive(0);
uint16_t target = input_adc0 / 2;
dac_load_data_buffer_single(target, RIGHT12, CHANNEL_2);
dac_software_trigger(CHANNEL_2);
uint16_t input_adc1 = read_adc_naiive(1);
printf("tick: %d: adc0= %u, target adc1=%d, adc1=%d\n",
j++, input_adc0, target, input_adc1);
/* LED on/off */
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 1000000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}