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Diffstat (limited to 'libmaple/stm32f2/usart.c')
| -rw-r--r-- | libmaple/stm32f2/usart.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/libmaple/stm32f2/usart.c b/libmaple/stm32f2/usart.c deleted file mode 100644 index 1472d13..0000000 --- a/libmaple/stm32f2/usart.c +++ /dev/null @@ -1,204 +0,0 @@ -/****************************************************************************** - * The MIT License - * - * Copyright (c) 2012 LeafLabs, LLC. - * - * Permission is hereby granted, free of charge, to any person - * obtaining a copy of this software and associated documentation - * files (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, copy, - * modify, merge, publish, distribute, sublicense, and/or sell copies - * of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - *****************************************************************************/ - -/** - * @file libmaple/stm32f2/usart.c - * @author Marti Bolivar <mbolivar@leaflabs.com> - * @brief STM32F2 USART. - */ - -#include <libmaple/usart.h> -#include <libmaple/gpio.h> -#include "usart_private.h" - -/* - * Devices - */ - -static ring_buffer usart1_rb; -static usart_dev usart1 = { - .regs = USART1_BASE, - .rb = &usart1_rb, - .max_baud = 4500000UL, /* TODO: are these correct? */ - .clk_id = RCC_USART1, - .irq_num = NVIC_USART1, -}; -/** USART1 device */ -usart_dev *USART1 = &usart1; - -static ring_buffer usart2_rb; -static usart_dev usart2 = { - .regs = USART2_BASE, - .rb = &usart2_rb, - .max_baud = 2250000UL, /* TODO: are these correct? */ - .clk_id = RCC_USART2, - .irq_num = NVIC_USART2, -}; -/** USART2 device */ -usart_dev *USART2 = &usart2; - -static ring_buffer usart3_rb; -static usart_dev usart3 = { - .regs = USART3_BASE, - .rb = &usart3_rb, - .max_baud = 2250000UL, /* TODO: are these correct? */ - .clk_id = RCC_USART3, - .irq_num = NVIC_USART3, -}; -/** USART3 device */ -usart_dev *USART3 = &usart3; - -static ring_buffer uart4_rb; -static usart_dev uart4 = { - .regs = UART4_BASE, - .rb = &uart4_rb, - .max_baud = 2250000UL, /* TODO: are these correct? */ - .clk_id = RCC_UART4, - .irq_num = NVIC_UART4, -}; -/** UART4 device */ -usart_dev *UART4 = &uart4; - -static ring_buffer uart5_rb; -static usart_dev uart5 = { - .regs = UART5_BASE, - .rb = &uart5_rb, - .max_baud = 2250000UL, /* TODO: are these correct? */ - .clk_id = RCC_UART5, - .irq_num = NVIC_UART5, -}; -/** UART5 device */ -usart_dev *UART5 = &uart5; - -static ring_buffer usart6_rb; -static usart_dev usart6 = { - .regs = USART6_BASE, - .rb = &usart6_rb, - .max_baud = 4500000UL, /* TODO: are these correct? */ - .clk_id = RCC_USART6, - .irq_num = NVIC_USART6, -}; -usart_dev *USART6 = &usart6; - -/* - * Routines - */ - -void usart_config_gpios_async(usart_dev *udev, - gpio_dev *rx_dev, uint8 rx, - gpio_dev *tx_dev, uint8 tx, - unsigned flags) { - gpio_af af = usart_get_af(udev); - gpio_set_modef(rx_dev, rx, GPIO_MODE_AF, 0); - gpio_set_modef(tx_dev, tx, GPIO_MODE_AF, 0); - gpio_set_af(rx_dev, rx, af); - gpio_set_af(tx_dev, tx, af); -} - -void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) { - uint32 integer_part; - uint32 fractional_part; - uint32 tmp; - uint32 over8 = !!(dev->regs->CR1 & USART_CR1_OVER8); - - ASSERT(!over8); /* OVER8 is currently unsupported. */ - - /* Figure out the clock speed, if the user doesn't give one. */ - if (clock_speed == 0) { - clock_speed = _usart_clock_freq(dev); - } - ASSERT(clock_speed); - - /* Convert desired baud rate to baud rate register setting. */ - integer_part = (25 * clock_speed) / (2 * (2 - over8) * baud); - tmp = (integer_part / 100) << 4; - fractional_part = integer_part - (100 * (tmp >> 4)); - tmp |= ((fractional_part * 16 + 50) / 100) & (uint8)0x0F; - - dev->regs->BRR = tmp; -} - -/** - * @brief Call a function on each USART. - * @param fn Function to call. - */ -void usart_foreach(void (*fn)(usart_dev*)) { - fn(USART1); - fn(USART2); - fn(USART3); - fn(UART4); - fn(UART5); - fn(USART6); -} - -/** - * @brief Get GPIO alternate function mode for a USART. - * @param dev USART whose gpio_af to get. - * @return gpio_af corresponding to dev. - */ -gpio_af usart_get_af(usart_dev *dev) { - switch (dev->clk_id) { - case RCC_USART1: - case RCC_USART2: - case RCC_USART3: - return GPIO_AF_USART_1_2_3; - case RCC_UART4: - case RCC_UART5: - case RCC_USART6: - return GPIO_AF_USART_4_5_6; - default: - ASSERT(0); /* Can't happen */ - return (gpio_af)-1; - } -} - -/* - * Interrupt handlers. - */ - -void __irq_usart1(void) { - usart_irq(&usart1_rb, USART1_BASE); -} - -void __irq_usart2(void) { - usart_irq(&usart2_rb, USART2_BASE); -} - -void __irq_usart3(void) { - usart_irq(&usart3_rb, USART3_BASE); -} - -void __irq_uart4(void) { - usart_irq(&uart4_rb, UART4_BASE); -} - -void __irq_uart5(void) { - usart_irq(&uart5_rb, UART5_BASE); -} - -void __irq_usart6(void) { - usart_irq(&usart6_rb, USART6_BASE); -} |