stm32f4: adc-dac-printf example
This is the same behaviour as the f1 and l1 examples of this code, making it easier to test changes to unification of the adc code.
This commit is contained in:
Karl Palsson
24
examples/stm32/f4/stm32f4-discovery/adc-dac-printf/Makefile
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24
examples/stm32/f4/stm32f4-discovery/adc-dac-printf/Makefile
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = adc-dac-printf
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LDSCRIPT = ../stm32f4-discovery.ld
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include ../../Makefile.include
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17
examples/stm32/f4/stm32f4-discovery/adc-dac-printf/README
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examples/stm32/f4/stm32f4-discovery/adc-dac-printf/README
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Console on PA2 (tx only) 115200@8n1
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* Prints the ADC value on PA0 (adc channel 0) on the console
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* Echos half that ADC value out to DAC channel 2 on PA5
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* Prints the ADC value of PA1 (adc channel 1) to the console.
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Recommended wiring:
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* pot or any resistor ladder to PA0
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* jumper from PA5 to PA1
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example output:
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...
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tick: 228: adc0= 3950, target adc1=1975, adc1=1979
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tick: 229: adc0= 3949, target adc1=1974, adc1=1978
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tick: 230: adc0= 3950, target adc1=1975, adc1=1979
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tick: 231: adc0= 3949, target adc1=1974, adc1=1978
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...
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/adc.h>
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#include <libopencm3/stm32/dac.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/usart.h>
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#define LED_DISCO_GREEN_PORT GPIOD
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#define LED_DISCO_GREEN_PIN GPIO12
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#define USART_CONSOLE USART2
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int _write(int file, char *ptr, int len);
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static void clock_setup(void)
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{
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rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
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/* Enable GPIOD clock for LED & USARTs. */
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
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/* Enable clocks for USART2 and dac */
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_DACEN);
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/* And ADC*/
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
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}
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static void usart_setup(void)
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{
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/* Setup GPIO pins for USART2 transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
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/* Setup USART2 TX pin as alternate function. */
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gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
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usart_set_baudrate(USART_CONSOLE, 115200);
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usart_set_databits(USART_CONSOLE, 8);
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usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
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usart_set_mode(USART_CONSOLE, USART_MODE_TX);
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usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
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usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART_CONSOLE);
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}
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/**
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* Use USART_CONSOLE as a console.
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* This is a syscall for newlib
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* @param file
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* @param ptr
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* @param len
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* @return
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*/
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == STDOUT_FILENO || file == STDERR_FILENO) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\n') {
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usart_send_blocking(USART_CONSOLE, '\r');
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}
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usart_send_blocking(USART_CONSOLE, ptr[i]);
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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static void adc_setup(void)
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{
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gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0);
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gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO1);
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adc_off(ADC1);
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adc_disable_scan_mode(ADC1);
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adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_3CYC);
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adc_power_on(ADC1);
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}
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static void dac_setup(void)
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{
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gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO5);
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dac_disable(CHANNEL_2);
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dac_disable_waveform_generation(CHANNEL_2);
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dac_enable(CHANNEL_2);
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dac_set_trigger_source(DAC_CR_TSEL2_SW);
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}
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static uint16_t read_adc_naiive(uint8_t channel)
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{
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uint8_t channel_array[16];
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channel_array[0] = channel;
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adc_set_regular_sequence(ADC1, 1, channel_array);
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adc_start_conversion_regular(ADC1);
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while (!adc_eoc(ADC1));
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uint16_t reg16 = adc_read_regular(ADC1);
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return reg16;
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}
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int main(void)
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{
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int i;
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int j = 0;
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clock_setup();
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usart_setup();
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printf("hi guys!\n");
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adc_setup();
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dac_setup();
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/* green led for ticking */
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gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_DISCO_GREEN_PIN);
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while (1) {
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uint16_t input_adc0 = read_adc_naiive(0);
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uint16_t target = input_adc0 / 2;
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dac_load_data_buffer_single(target, RIGHT12, CHANNEL_2);
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dac_software_trigger(CHANNEL_2);
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uint16_t input_adc1 = read_adc_naiive(1);
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printf("tick: %d: adc0= %u, target adc1=%d, adc1=%d\n",
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j++, input_adc0, target, input_adc1);
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gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN); /* LED on/off */
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for (i = 0; i < 1000000; i++) /* Wait a bit. */
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__asm__("NOP");
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}
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return 0;
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}
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