Merge pull request #81 "[examples f1] ADC+DAC very basic example"
Merge remote-tracking branch 'karlp/pr_f1_adc_dac'
This commit is contained in:
Piotr Esden-Tempski
commit
f980f197ca
24
examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile
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examples/stm32/f1/stm32vl-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 = ../../../../../lib/stm32/f1/stm32f100xb.ld
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include ../../Makefile.include
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17
examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README
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examples/stm32/f1/stm32vl-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) 2013 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/dac.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/adc.h>
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#define LED_DISCOVERY_USER_PORT GPIOC
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#define LED_DISCOVERY_USER_PIN GPIO8
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#define USART_CONSOLE USART2
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void clock_setup(void)
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{
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rcc_clock_setup_in_hsi_out_24mhz();
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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 the ADC and IO ports */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
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}
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void usart_setup(void)
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{
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
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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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void adc_setup(void)
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{
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO0);
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO1);
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/* Make sure the ADC doesn't run during config. */
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adc_off(ADC1);
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/* We configure everything for one single conversion. */
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adc_disable_scan_mode(ADC1);
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adc_set_single_conversion_mode(ADC1);
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adc_disable_external_trigger_regular(ADC1);
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adc_set_right_aligned(ADC1);
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adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
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adc_power_on(ADC1);
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/* Wait for ADC starting up. */
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int i;
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for (i = 0; i < 800000; i++) /* Wait a bit. */
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__asm__("nop");
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adc_reset_calibration(ADC1);
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adc_calibration(ADC1);
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}
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void dac_setup(void)
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{
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, 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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u16 read_adc_naiive(u8 channel)
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{
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u8 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_direct(ADC1);
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while (!adc_eoc(ADC1));
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u16 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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gpio_set_mode(LED_DISCOVERY_USER_PORT, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, LED_DISCOVERY_USER_PIN);
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while (1) {
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u16 input_adc0 = read_adc_naiive(0);
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u16 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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u16 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_DISCOVERY_USER_PORT, LED_DISCOVERY_USER_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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