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authorUwe Hermann2010-12-30 01:52:44 +0100
committerUwe Hermann2010-12-30 01:52:44 +0100
commitbcce98da54b047a15ef0abf41e0c7794f29f0439 (patch)
tree98462dcb9874341bd7342a1794ec01e8ad420d47 /examples/stm32/other/adc_temperature_sensor/adc.c
parentb65f3f06d061823fac1af91594e0d702b4c80693 (diff)
Move STM32 examples to examples/stm32 subdir.
Diffstat (limited to 'examples/stm32/other/adc_temperature_sensor/adc.c')
-rw-r--r--examples/stm32/other/adc_temperature_sensor/adc.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/examples/stm32/other/adc_temperature_sensor/adc.c b/examples/stm32/other/adc_temperature_sensor/adc.c
new file mode 100644
index 0000000..7445399
--- /dev/null
+++ b/examples/stm32/other/adc_temperature_sensor/adc.c
@@ -0,0 +1,147 @@
+/*
+ * This file is part of the libopenstm32 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopenstm32/rcc.h>
+#include <libopenstm32/flash.h>
+#include <libopenstm32/gpio.h>
+#include <libopenstm32/usart.h>
+#include <libopenstm32/adc.h>
+
+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_APB2ENR, RCC_APB2ENR_USART1EN);
+
+ /* 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_USART1_TX);
+
+ /* Setup UART parameters. */
+ usart_set_baudrate(USART1, 115200);
+ usart_set_databits(USART1, 8);
+ usart_set_stopbits(USART1, USART_STOPBITS_1);
+ usart_set_mode(USART1, USART_MODE_TX_RX);
+ usart_set_parity(USART1, USART_PARITY_NONE);
+ usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+ /* Finally enable the USART. */
+ usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+ /* Enable GPIOB clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+ /* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void adc_setup(void)
+{
+ int i;
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
+
+ /* make shure it didnt run during config */
+ adc_off(ADC1);
+
+ /* we configure everything for one single conversion */
+ adc_disable_scan_mode(ADC1);
+ adc_set_single_conversion_mode(ADC1);
+ adc_enable_discontinous_mode_regular(ADC1);
+ adc_disable_external_trigger_regular(ADC1);
+ adc_set_right_aligned(ADC1);
+ /* we want read out 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 < 80000; i++); /* Wait (needs -O0 CFLAGS). */
+
+ adc_reset_calibration(ADC1);
+ adc_calibration(ADC1);
+}
+
+void my_usart_print_int(u32 usart, int value)
+{
+ s8 i;
+ u8 nr_digits = 0;
+ char buffer[25];
+
+ if (value < 0) {
+ usart_send(usart, '-');
+ value = value * -1;
+ }
+
+ while (value > 0) {
+ buffer[nr_digits++] = "0123456789"[value%10];
+ value = value/10;
+ }
+
+ for (i=nr_digits; i>=0; i--) {
+ usart_send(usart, buffer[i]);
+ }
+}
+
+int main(void)
+{
+ u8 channel_array[16];
+ u16 temperature;
+
+ rcc_clock_setup_in_hse_16mhz_out_72mhz();
+ gpio_setup();
+ usart_setup();
+ adc_setup();
+
+ gpio_clear(GPIOB, GPIO7); /* LED1 on */
+ gpio_set(GPIOB, GPIO6); /* LED2 off */
+
+ /* Send a message on USART1. */
+ usart_send(USART1, 's');
+ usart_send(USART1, 't');
+ usart_send(USART1, 'm');
+ usart_send(USART1, '\r');
+ usart_send(USART1, '\n');
+
+ /* Select the channel we want to convert. 16=temperature_sensor */
+ channel_array[0] = 16;
+ adc_set_regular_sequence(ADC1, 1, channel_array);
+
+ /* If the ADC_CR2_ON bit is already set -> setting it another time starts the conversion */
+ adc_on(ADC1);
+
+ /* Waiting for end of conversion */
+ while (!(ADC_SR(ADC1) & ADC_SR_EOC));
+
+ temperature = ADC_DR(ADC1);
+
+ /* thats actually not the real temparature - you have to compute it like described in the datasheet */
+ my_usart_print_int(USART1, temperature);
+
+ gpio_clear(GPIOB, GPIO6); /* LED2 on */
+
+ while(1); /* Halt. */
+
+ return 0;
+}