d84c4030b2
Now all examples are including only the modules they really need. Also each header file of the library is including only the necessary headers making it possible to use these modules in parallel with other implementations that may collide with the definitions in other modules.
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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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 <libopenstm32/rcc.h>
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#include <libopenstm32/gpio.h>
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#include <libopenstm32/usart.h>
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void clock_setup(void)
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{
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/* Select HSI as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK);
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/* Set the PLL multiplication factor to 9. */
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rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9);
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/* Select HSI/2 as PLL source. */
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rcc_set_pll_source(PLLSRC_HSI_CLK_DIV2);
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rcc_set_pllxtpre(PLLXTPRE_HSE_CLK_DIV2);
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/* Enable PLL oscillator and wait for it to stabilize. */
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rcc_osc_on(PLL);
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rcc_wait_for_osc_ready(PLL);
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/* Select PLL as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_PLLCLK);
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}
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void usart_setup(void)
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{
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/* Enable clocks for GPIO port B (for GPIO_USART3_TX) and USART3. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPBEN);
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rcc_peripheral_enable_clock(&RCC_APB1ENR, USART3EN);
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/* Setup GPIO pin GPIO_USART3_TX/GPIO10 on GPIO port B for transmit. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART3_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART3, 38400);
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usart_set_databits(USART3, 8);
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usart_set_stopbits(USART3, USART_STOPBITS_1);
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usart_set_mode(USART3, USART_MODE_TX);
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usart_set_parity(USART3, USART_PARITY_NONE);
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usart_set_flow_control(USART3, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART3);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOC clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPCEN);
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/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
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}
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int main(void)
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{
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int i, j = 0, c = 0;
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clock_setup();
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gpio_setup();
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usart_setup();
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/* Blink the LED (PC12) on the board with every transmitted byte. */
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while (1) {
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gpio_toggle(GPIOC, GPIO12); /* LED on/off */
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usart_send(USART3, c + '0'); /* Send one byte on USART3. */
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c = (c == 9) ? 0 : c + 1; /* Increment c. */
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if ((j++ % 80) == 0) { /* Newline after line full. */
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usart_send(USART3, '\r');
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usart_send(USART3, '\n');
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}
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for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
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}
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return 0;
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}
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