From 13dedaafc1be28ced50b6a5426f4b87a8a6dc61b Mon Sep 17 00:00:00 2001 From: Karl Palsson Date: Tue, 22 Jan 2013 10:55:58 +0000 Subject: [examples f1] ADC+DAC very basic example Just shows some basic working examples of using the DAC with the ADC. No special features, but very little hardware required to demonstrate. --- .../f1/stm32vl-discovery/adc-dac-printf/Makefile | 24 +++ .../f1/stm32vl-discovery/adc-dac-printf/README | 17 +++ .../adc-dac-printf/adc-dac-printf.c | 162 +++++++++++++++++++++ 3 files changed, 203 insertions(+) create mode 100644 examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile create mode 100644 examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README create mode 100644 examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c 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 +## +## 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 . +## + +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 + * + * 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 . + */ + +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#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; +} -- cgit v1.2.3