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But first, please read . diff --git a/README.md b/README.md deleted file mode 100644 index 88e9e63..0000000 --- a/README.md +++ /dev/null @@ -1,3 +0,0 @@ -# synth - -Trying to make a software synthesizer for arduino \ No newline at end of file diff --git a/platformio.ini b/platformio.ini index edd3068..e77d5d8 100644 --- a/platformio.ini +++ b/platformio.ini @@ -8,7 +8,7 @@ ; Please visit documentation for the other options and examples ; https://docs.platformio.org/page/projectconf.html -[env:micro] -platform = atmelavr -board = micro -framework = arduino +[env:nucleo_f302r8] +platform = ststm32 +board = nucleo_f302r8 +framework = libopencm3 diff --git a/src/README.md b/src/README.md new file mode 100644 index 0000000..e09f36f --- /dev/null +++ b/src/README.md @@ -0,0 +1,19 @@ +# README + +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/src/adc-dac-printf.c b/src/adc-dac-printf.c new file mode 100644 index 0000000..d86c541 --- /dev/null +++ b/src/adc-dac-printf.c @@ -0,0 +1,161 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2014 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_DISCO_GREEN_PORT GPIOD +#define LED_DISCO_GREEN_PIN GPIO12 + +#define USART_CONSOLE USART2 + +int _write(int file, char *ptr, int len); + +static void clock_setup(void) +{ + rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]); + /* Enable GPIOD clock for LED & USARTs. */ + rcc_periph_clock_enable(RCC_GPIOD); + rcc_periph_clock_enable(RCC_GPIOA); + + /* Enable clocks for USART2 and dac */ + rcc_periph_clock_enable(RCC_USART2); + rcc_periph_clock_enable(RCC_DAC); + + /* And ADC*/ + rcc_periph_clock_enable(RCC_ADC1); +} + +static void usart_setup(void) +{ + /* Setup GPIO pins for USART2 transmit. */ + gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2); + + /* Setup USART2 TX pin as alternate function. */ + gpio_set_af(GPIOA, GPIO_AF7, GPIO2); + + 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; +} + +static void adc_setup(void) +{ + gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0); + gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO1); + + adc_power_off(ADC1); + adc_disable_scan_mode(ADC1); + adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_3CYC); + + adc_power_on(ADC1); + +} + +static void dac_setup(void) +{ + gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO5); + dac_disable(DAC1, DAC_CHANNEL2); + dac_disable_waveform_generation(DAC1, DAC_CHANNEL2); + dac_enable(DAC1, DAC_CHANNEL2); + dac_set_trigger_source(DAC1, DAC_CR_TSEL2_SW); +} + +static uint16_t read_adc_naiive(uint8_t channel) +{ + uint8_t channel_array[16]; + channel_array[0] = channel; + adc_set_regular_sequence(ADC1, 1, channel_array); + adc_start_conversion_regular(ADC1); + while (!adc_eoc(ADC1)); + uint16_t 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(); + + /* green led for ticking */ + gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, + LED_DISCO_GREEN_PIN); + + while (1) { + uint16_t input_adc0 = read_adc_naiive(0); + uint16_t target = input_adc0 / 2; + dac_load_data_buffer_single(DAC1, target, DAC_ALIGN_RIGHT12, DAC_CHANNEL2); + dac_software_trigger(DAC1, DAC_CHANNEL2); + uint16_t input_adc1 = read_adc_naiive(1); + printf("tick: %d: adc0= %u, target adc1=%d, adc1=%d\n", + j++, input_adc0, target, input_adc1); + + /* LED on/off */ + gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN); + + for (i = 0; i < 1000000; i++) { /* Wait a bit. */ + __asm__("NOP"); + } + } + + return 0; +} diff --git a/src/main.cpp b/src/main.cpp deleted file mode 100644 index 527c523..0000000 --- a/src/main.cpp +++ /dev/null @@ -1,18 +0,0 @@ -#include "Arduino.h" - -void setup() { - delay(2000); - DDRD = 0xFF; -} - -void loop() { - PORTD = 0x00; - delay(1000); - PORTD = 0xFF; - delay(1000); - PORTD = 0x7F; - delay(1000); - PORTD = 0xF7; - delay(1000); - -}