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authorPiotr Esden-Tempski2013-02-18 14:07:00 -0800
committerPiotr Esden-Tempski2013-02-18 14:07:00 -0800
commitf980f197ca17c324089f8650fee9df081e5502e6 (patch)
tree0fd2476cd3fe73261b26f953d55b88ac4ced92d3
parent9095f58fa3c167a8646a0f9abd5461115e53e2de (diff)
parent13dedaafc1be28ced50b6a5426f4b87a8a6dc61b (diff)
Merge pull request #81 "[examples f1] ADC+DAC very basic example"
Merge remote-tracking branch 'karlp/pr_f1_adc_dac'
-rw-r--r--examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile24
-rw-r--r--examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README17
-rw-r--r--examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c162
3 files changed, 203 insertions, 0 deletions
diff --git a/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile
new file mode 100644
index 0000000..979317c
--- /dev/null
+++ b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile
@@ -0,0 +1,24 @@
+##
+## 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-dac-printf
+LDSCRIPT = ../../../../../lib/stm32/f1/stm32f100xb.ld
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README
new file mode 100644
index 0000000..796cba2
--- /dev/null
+++ b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README
@@ -0,0 +1,17 @@
+Console on PA2 (tx only) 115200@8n1
+
+* Prints the ADC value on PA0 (adc channel 0) on the console
+* Echos half that ADC value out to DAC channel 2 on PA5
+* Prints the ADC value of PA1 (adc channel 1) to the console.
+
+Recommended wiring:
+* pot or any resistor ladder to PA0
+* jumper from PA5 to PA1
+
+example output:
+...
+tick: 228: adc0= 3950, target adc1=1975, adc1=1979
+tick: 229: adc0= 3949, target adc1=1974, adc1=1978
+tick: 230: adc0= 3950, target adc1=1975, adc1=1979
+tick: 231: adc0= 3949, target adc1=1974, adc1=1978
+...
diff --git a/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c
new file mode 100644
index 0000000..92e43c0
--- /dev/null
+++ b/examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c
@@ -0,0 +1,162 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2013 Karl Palsson <karlp@tweak.net.au>
+ *
+ * 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 <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/dac.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/f1/rcc.h>
+#include <libopencm3/stm32/f1/adc.h>
+
+#define LED_DISCOVERY_USER_PORT GPIOC
+#define LED_DISCOVERY_USER_PIN GPIO8
+
+#define USART_CONSOLE USART2
+
+void clock_setup(void)
+{
+ rcc_clock_setup_in_hsi_out_24mhz();
+ /* Enable clocks for USART2 and DAC*/
+ rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
+ rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_DACEN);
+
+ /* and the ADC and IO ports */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
+}
+
+void usart_setup(void)
+{
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
+
+ usart_set_baudrate(USART_CONSOLE, 115200);
+ usart_set_databits(USART_CONSOLE, 8);
+ usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
+ usart_set_mode(USART_CONSOLE, USART_MODE_TX);
+ usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
+ usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
+
+ /* Finally enable the USART. */
+ usart_enable(USART_CONSOLE);
+}
+
+/**
+ * Use USART_CONSOLE as a console.
+ * This is a syscall for newlib
+ * @param file
+ * @param ptr
+ * @param len
+ * @return
+ */
+int _write(int file, char *ptr, int len)
+{
+ int i;
+
+ if (file == STDOUT_FILENO || file == STDERR_FILENO) {
+ for (i = 0; i < len; i++) {
+ if (ptr[i] == '\n') {
+ usart_send_blocking(USART_CONSOLE, '\r');
+ }
+ usart_send_blocking(USART_CONSOLE, ptr[i]);
+ }
+ return i;
+ }
+ errno = EIO;
+ return -1;
+}
+
+void adc_setup(void)
+{
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO0);
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO1);
+
+ /* 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_disable_external_trigger_regular(ADC1);
+ adc_set_right_aligned(ADC1);
+ adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
+
+ adc_power_on(ADC1);
+
+ /* Wait for ADC starting up. */
+ int i;
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("nop");
+
+ adc_reset_calibration(ADC1);
+ adc_calibration(ADC1);
+}
+
+void dac_setup(void)
+{
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO5);
+ dac_disable(CHANNEL_2);
+ dac_disable_waveform_generation(CHANNEL_2);
+ dac_enable(CHANNEL_2);
+ dac_set_trigger_source(DAC_CR_TSEL2_SW);
+}
+
+u16 read_adc_naiive(u8 channel)
+{
+ u8 channel_array[16];
+ channel_array[0] = channel;
+ adc_set_regular_sequence(ADC1, 1, channel_array);
+ adc_start_conversion_direct(ADC1);
+ while (!adc_eoc(ADC1));
+ u16 reg16 = adc_read_regular(ADC1);
+ return reg16;
+}
+
+int main(void)
+{
+ int i;
+ int j = 0;
+ clock_setup();
+ usart_setup();
+ printf("hi guys!\n");
+ adc_setup();
+ dac_setup();
+ gpio_set_mode(LED_DISCOVERY_USER_PORT, GPIO_MODE_OUTPUT_2_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, LED_DISCOVERY_USER_PIN);
+
+ while (1) {
+ u16 input_adc0 = read_adc_naiive(0);
+ u16 target = input_adc0 / 2;
+ dac_load_data_buffer_single(target, RIGHT12, CHANNEL_2);
+ dac_software_trigger(CHANNEL_2);
+ u16 input_adc1 = read_adc_naiive(1);
+ printf("tick: %d: adc0= %u, target adc1=%d, adc1=%d\n",
+ j++, input_adc0, target, input_adc1);
+ gpio_toggle(LED_DISCOVERY_USER_PORT, LED_DISCOVERY_USER_PIN); /* LED on/off */
+ for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ __asm__("NOP");
+ }
+
+ return 0;
+}