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authorPiotr Esden-Tempski2012-08-26 14:07:04 -0700
committerPiotr Esden-Tempski2012-09-10 14:01:23 -0700
commitd1cc8ca2b3455019391d8a6fda5f66b952c3aea7 (patch)
treee4f851d20ed6cee059102cd0e45017c742a2e273
parent7373bfcb9b144ae7c2e8685d6d65bbeb3786ca7b (diff)
Added simple adc example for lisa/m 2.
-rw-r--r--examples/stm32/f1/lisa-m-2/adc/Makefile27
-rw-r--r--examples/stm32/f1/lisa-m-2/adc/README9
-rw-r--r--examples/stm32/f1/lisa-m-2/adc/adc.c162
3 files changed, 198 insertions, 0 deletions
diff --git a/examples/stm32/f1/lisa-m-2/adc/Makefile b/examples/stm32/f1/lisa-m-2/adc/Makefile
new file mode 100644
index 0000000..20355ce
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/adc/Makefile
@@ -0,0 +1,27 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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/>.
+##
+
+BINARY = adc
+# Comment the following line if you _don't_ have luftboot flashed!
+LDFLAGS += -Wl,-Ttext=0x8002000
+CFLAGS += -std=c99
+LDSCRIPT = ../lisa-m.ld
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/f1/lisa-m-2/adc/README b/examples/stm32/f1/lisa-m-2/adc/README
new file mode 100644
index 0000000..3b583ff
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/adc/README
@@ -0,0 +1,9 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is a simple polling example that sends the value read out from the
+temperature sensor ADC channel of the STM32 to the USART2.
+
+The terminal settings for the receiving device/PC are 115200 8n1.
+
diff --git a/examples/stm32/f1/lisa-m-2/adc/adc.c b/examples/stm32/f1/lisa-m-2/adc/adc.c
new file mode 100644
index 0000000..91d029f
--- /dev/null
+++ b/examples/stm32/f1/lisa-m-2/adc/adc.c
@@ -0,0 +1,162 @@
+/*
+ * 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>
+ *
+ * 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>
+
+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 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 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 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);
+ 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_blocking(usart, '-');
+ value = value * -1;
+ }
+
+ while (value > 0) {
+ buffer[nr_digits++] = "0123456789"[value % 10];
+ value /= 10;
+ }
+
+ for (i = nr_digits; i >= 0; i--) {
+ usart_send_blocking(usart, buffer[i]);
+ }
+
+ usart_send_blocking(usart, '\r');
+}
+
+int main(void)
+{
+ u8 channel_array[16];
+ u16 temperature = 0;
+
+ rcc_clock_setup_in_hse_12mhz_out_72mhz();
+ gpio_setup();
+ usart_setup();
+ adc_setup();
+
+ gpio_set(GPIOA, GPIO8); /* LED1 on */
+ gpio_set(GPIOC, GPIO15); /* LED2 off */
+
+ /* 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;
+ adc_set_regular_sequence(ADC1, 1, channel_array);
+
+ /* Continously convert and poll the temperature ADC. */
+ while (1) {
+ /*
+ * If the ADC_CR2_ON bit is already set -> setting it another time
+ * starts the conversion.
+ */
+ adc_on(ADC1);
+
+ /* Wait for end of conversion. */
+ while (!(ADC_SR(ADC1) & ADC_SR_EOC));
+
+ temperature = ADC_DR(ADC1);
+
+ /*
+ * 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;
+}