2092a6759d
This brings in the new ADC api for STM32 parts. Update to new standardized ADC apis. Drops pointless channel definitions, uses common names for common functions. No functional changes. Based on work in: https://github.com/libopencm3/libopencm3-examples/pull/130
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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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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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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* Modified by Fernando Cortes <fermando.corcam@gmail.com>
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* modified by Guillermo Rivera <memogrg@gmail.com>
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* modified by Frantisek Burian <BuFran@seznam.cz>
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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 <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/adc.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/gpio.h>
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uint8_t channel_array[] = { 1, 1, ADC_CHANNEL_TEMP};
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static void adc_setup(void)
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{
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rcc_periph_clock_enable(RCC_ADC);
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rcc_periph_clock_enable(RCC_GPIOA);
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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_power_off(ADC1);
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adc_set_clk_source(ADC1, ADC_CLKSOURCE_ADC);
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adc_calibrate_start(ADC1);
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adc_calibrate_wait_finish(ADC1);
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adc_set_operation_mode(ADC1, ADC_MODE_SCAN);
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adc_disable_external_trigger_regular(ADC1);
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adc_set_right_aligned(ADC1);
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adc_enable_temperature_sensor();
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adc_set_sample_time_on_all_channels(ADC1, ADC_SMPTIME_071DOT5);
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adc_set_regular_sequence(ADC1, 1, channel_array);
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adc_set_resolution(ADC1, ADC_RESOLUTION_12BIT);
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adc_disable_analog_watchdog(ADC1);
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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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}
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}
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static void usart_setup(void)
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{
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/* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART1. */
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rcc_periph_clock_enable(RCC_USART1);
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rcc_periph_clock_enable(RCC_GPIOA);
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/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
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gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 38400);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_CR2_STOP_1_0BIT);
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usart_set_mode(USART1, USART_MODE_TX);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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static void my_usart_print_int(uint32_t usart, int16_t value)
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{
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int8_t i;
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int8_t nr_digits = 0;
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char buffer[25];
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if (value < 0) {
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usart_send_blocking(usart, '-');
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value = value * -1;
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}
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if (value == 0) {
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usart_send_blocking(usart, '0');
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}
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while (value > 0) {
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buffer[nr_digits++] = "0123456789"[value % 10];
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value /= 10;
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}
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for (i = nr_digits-1; i >= 0; i--) {
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usart_send_blocking(usart, buffer[i]);
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}
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usart_send_blocking(usart, '\r');
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usart_send_blocking(usart, '\n');
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}
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int main(void)
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{
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uint16_t temp;
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adc_setup();
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usart_setup();
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while (1) {
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adc_start_conversion_regular(ADC1);
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while (!(adc_eoc(ADC1)));
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temp = adc_read_regular(ADC1);
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my_usart_print_int(USART1, temp);
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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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}
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}
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return 0;
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}
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