116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2011 Fergus Noble <fergusnoble@gmail.com>
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* Copyright (C) 2011 Henry Hallam <henry@pericynthion.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <libopencm3/stm32/spi.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/nvic.h>
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#include <libopencm3/stm32/f2/gpio.h>
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#include <libopencm3/stm32/f2/rcc.h>
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void clock_setup(void)
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{
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#warning "This code has to call some kind of rcc clock setup function!!!"
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RCC_APB1ENR |= RCC_APB1ENR_SPI2EN;
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RCC_APB2ENR |= RCC_APB2ENR_USART1EN;
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RCC_AHB1ENR |=
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RCC_AHB1ENR_IOPCEN | RCC_AHB1ENR_IOPAEN | RCC_AHB1ENR_IOPBEN;
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}
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void spi_setup(void)
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{
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gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE,
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GPIO13 | GPIO14 | GPIO15);
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gpio_set_af(GPIOB, GPIO_AF5, GPIO13 | GPIO14 | GPIO15);
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/* Setup SPI parameters. */
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spi_init_master(SPI2, SPI_CR1_BAUDRATE_FPCLK_DIV_256, SPI_CR1_CPOL,
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SPI_CR1_CPHA, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
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spi_enable_ss_output(SPI2); /* Required, see NSS, 25.3.1 section. */
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/* Finally enable the SPI. */
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spi_enable(SPI2);
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}
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void usart_setup(void)
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{
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
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gpio_set_af(GPIOA, GPIO_AF7, GPIO9 | GPIO10);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 9600);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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usart_set_mode(USART1, USART_MODE_TX);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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void gpio_setup(void)
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{
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gpio_set(GPIOC, GPIO3);
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/* Setup GPIO3 (in GPIO port C) for LED use. */
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gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_MODE_OUTPUT, GPIO3);
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}
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == 1) {
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for (i = 0; i < len; i++)
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usart_send_blocking(USART1, ptr[i]);
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return i;
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}
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errno = EIO;
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return -1;
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}
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int main(void)
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{
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int counter = 0;
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volatile u16 dummy;
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clock_setup();
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gpio_setup();
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usart_setup();
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spi_setup();
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while (1) {
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counter++;
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printf("Hello, world! %i\r\n", counter);
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/* Stops RX buffer overflow, but probably not needed. */
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dummy = spi_read(SPI2);
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spi_send(SPI2, (u8) counter);
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gpio_toggle(GPIOC, GPIO3);
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}
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while (1);
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return 0;
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}
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