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Diffstat (limited to 'examples/stm32/f1/lisa-m-2/adc_injec_timtrig_irq/adc_injec_timtrig_irq.c')
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diff --git a/examples/stm32/f1/lisa-m-2/adc_injec_timtrig_irq/adc_injec_timtrig_irq.c b/examples/stm32/f1/lisa-m-2/adc_injec_timtrig_irq/adc_injec_timtrig_irq.c
new file mode 100644
index 0000000..73814d8
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/adc_injec_timtrig_irq/adc_injec_timtrig_irq.c
@@ -0,0 +1,211 @@
+/*
+ * 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>
+#include <libopencm3/stm32/timer.h>
+#include <libopencm3/stm32/nvic.h>
+
+volatile u16 temperature = 0;
+
+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 timer_setup(void)
+{
+ /* Set up the timer TIM2 for injected sampling */
+ uint32_t timer;
+ volatile uint32_t *rcc_apbenr;
+ uint32_t rcc_apb;
+
+ timer = TIM2;
+ rcc_apbenr = &RCC_APB1ENR;
+ rcc_apb = RCC_APB1ENR_TIM2EN;
+
+ rcc_peripheral_enable_clock(rcc_apbenr, rcc_apb);
+
+ /* Time Base configuration */
+ timer_reset(timer);
+ timer_set_mode(timer, TIM_CR1_CKD_CK_INT,
+ TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+ timer_set_period(timer, 0xFF);
+ timer_set_prescaler(timer, 0x8);
+ timer_set_clock_division(timer, 0x0);
+ /* Generate TRGO on every update. */
+ timer_set_master_mode(timer, TIM_CR2_MMS_UPDATE);
+ timer_enable_counter(timer);
+}
+
+void irq_setup(void)
+{
+ /* Enable the adc1_2_isr() routine */
+ nvic_set_priority(NVIC_ADC1_2_IRQ, 0);
+ nvic_enable_irq(NVIC_ADC1_2_IRQ);
+}
+
+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 timer triggered injected conversion with interrupt generation. */
+ /* While not needed for a single channel, try out scan mode which does all channels in one sweep and
+ * generates the interrupt/EOC/JEOC flags set at the end of all channels, not each one.
+ */
+ adc_enable_scan_mode(ADC1);
+ adc_set_single_conversion_mode(ADC1);
+ /* We want to start the injected conversion with the TIM2 TRGO */
+ adc_enable_external_trigger_injected(ADC1,ADC_CR2_JEXTSEL_TIM2_TRGO);
+ /* Generate the ADC1_2_IRQ */
+ adc_enable_jeoc_interrupt(ADC1);
+ 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);
+ adc_calibration(ADC1);
+ while ((ADC_CR2(ADC1) & ADC_CR2_CAL) != 0);
+}
+
+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];
+
+ rcc_clock_setup_in_hse_12mhz_out_72mhz();
+ gpio_setup();
+ usart_setup();
+ timer_setup();
+ irq_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) {
+ /*
+ * Since sampling is triggered by the timer and copying the value
+ * out of the data register is handled by the interrupt routine,
+ * we just need to print the value and toggle the LED. It may be useful
+ * to buffer the adc values in some cases.
+ */
+
+ /*
+ * 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;
+}
+
+void adc1_2_isr(void)
+{
+ /* Clear Injected End Of Conversion (JEOC) */
+ ADC_SR(ADC1) &= ~ADC_SR_JEOC;
+ temperature = ADC_JDR1(ADC1);
+}