/* * This file is part of the libopencm3 project. * * Copyright (C) 2009 Uwe Hermann , * Copyright (C) 2011-2012 Piotr Esden-Tempski * * 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 void clock_setup(void) { rcc_clock_setup_in_hse_12mhz_out_72mhz(); /* Enable GPIOA clock (for LED GPIOs). */ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); /* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART2. */ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN | RCC_APB2ENR_AFIOEN); rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN); } void usart_setup(void) { /* Setup GPIO pin GPIO_USART2_RE_TX on GPIO port B for transmit. */ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX); /* Setup UART parameters. */ usart_set_baudrate(USART2, 230400); usart_set_databits(USART2, 8); usart_set_stopbits(USART2, USART_STOPBITS_1); usart_set_parity(USART2, USART_PARITY_NONE); usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE); usart_set_mode(USART2, USART_MODE_TX); /* Finally enable the USART. */ usart_enable(USART2); } void gpio_setup(void) { gpio_set(GPIOA, GPIO8); /* Setup GPIO8 (in GPIO port A) for LED use. */ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8); } int _write(int file, char *ptr, int len) { int i; if (file == 1) { for (i = 0; i < len; i++) usart_send_blocking(USART2, ptr[i]); return i; } errno = EIO; return -1; } int main(void) { int counter = 0; float fcounter = 0.0; double dcounter = 0.0; clock_setup(); gpio_setup(); usart_setup(); /* * Write Hello World, an integer, float and double all over * again while incrementing the numbers. */ while (1) { gpio_toggle(GPIOA, GPIO8); printf("Hello World! %i %f %f\r\n", counter, fcounter, dcounter); counter++; fcounter += 0.01; dcounter += 0.01; } return 0; }