215 lines
5.5 KiB
C
215 lines
5.5 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2012 LeafLabs, LLC.
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/stm32f1/usart.c
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* @author Marti Bolivar <mbolivar@leaflabs.com>,
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* Perry Hung <perry@leaflabs.com>
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* @brief STM32F1 USART.
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*/
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#include <libmaple/usart.h>
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#include <libmaple/gpio.h>
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#include "usart_private.h"
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/*
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* Devices
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*/
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static ring_buffer usart1_rb;
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static usart_dev usart1 = {
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.regs = USART1_BASE,
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.rb = &usart1_rb,
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.max_baud = 4500000UL,
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.clk_id = RCC_USART1,
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.irq_num = NVIC_USART1,
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};
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/** USART1 device */
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usart_dev *USART1 = &usart1;
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static ring_buffer usart2_rb;
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static usart_dev usart2 = {
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.regs = USART2_BASE,
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.rb = &usart2_rb,
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.max_baud = 2250000UL,
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.clk_id = RCC_USART2,
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.irq_num = NVIC_USART2,
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};
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/** USART2 device */
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usart_dev *USART2 = &usart2;
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static ring_buffer usart3_rb;
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static usart_dev usart3 = {
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.regs = USART3_BASE,
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.rb = &usart3_rb,
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.max_baud = 2250000UL,
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.clk_id = RCC_USART3,
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.irq_num = NVIC_USART3,
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};
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/** USART3 device */
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usart_dev *USART3 = &usart3;
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#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
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static ring_buffer uart4_rb;
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static usart_dev uart4 = {
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.regs = UART4_BASE,
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.rb = &uart4_rb,
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.max_baud = 2250000UL,
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.clk_id = RCC_UART4,
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.irq_num = NVIC_UART4,
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};
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/** UART4 device */
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usart_dev *UART4 = &uart4;
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static ring_buffer uart5_rb;
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static usart_dev uart5 = {
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.regs = UART5_BASE,
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.rb = &uart5_rb,
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.max_baud = 2250000UL,
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.clk_id = RCC_UART5,
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.irq_num = NVIC_UART5,
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};
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/** UART5 device */
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usart_dev *UART5 = &uart5;
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#endif
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/*
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* Routines
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*/
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void usart_config_gpios_async(usart_dev *udev,
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gpio_dev *rx_dev, uint8 rx,
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gpio_dev *tx_dev, uint8 tx,
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unsigned flags) {
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gpio_set_mode(rx_dev, rx, GPIO_INPUT_FLOATING);
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gpio_set_mode(tx_dev, tx, GPIO_AF_OUTPUT_PP);
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/*
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CR1 bit 12 Word length 0=8 1=9
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CR1 bit 11 wake (default value is 0) we can safely set this value to 0 (zero) each time
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CR1 bit 10 parity enable (1 = enabled)
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CR1 bit 9 Parity selection 0 = Even 1 = Odd
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CR2 bits 13 and 12 00 = 1 01 = 0.5 10 = 2 11 = 1.5
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Not all USARTs support 1.5 or 0.5 bits so its best to avoid them.
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CR2 CR1
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0B00 0000
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0B10 0000
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0B00 1000
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0B10 1000
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0B00 0010
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0B10 0010
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0B00 1010
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0B10 1010
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0B00 0011
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0B10 0011
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0B00 1011
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0B10 1011
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#define SERIAL_8N1 0B 0000 0000
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#define SERIAL_8N2 0B 0010 0000
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#define SERIAL_9N1 0B 0000 1000
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#define SERIAL_9N2 0B 0010 1000
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#define SERIAL_8E1 0B 0000 0010
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#define SERIAL_8E2 0B 0010 0010
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#define SERIAL_9E1 0B 0000 1010
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#define SERIAL_9E2 0B 0010 1010
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#define SERIAL_8O1 0B 0000 0011
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#define SERIAL_8O2 0B 0010 0011
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#define SERIAL_9O1 0B 0000 1011
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#define SERIAL_9O2 0B 0010 1011
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*/
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udev->regs->CR1 = udev->regs->CR1 ^ ((udev->regs->CR1 ^ (flags&0x0F)<<9 ) & 0B0001111000000000);
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udev->regs->CR2 = udev->regs->CR2 ^ ((udev->regs->CR2 ^ (flags&0xF0)<<8 ) & 0B0011000000000000);
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}
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void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) {
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uint32 integer_part;
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uint32 fractional_part;
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uint32 tmp;
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/* Figure out the clock speed, if the user doesn't give one. */
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if (clock_speed == 0) {
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clock_speed = _usart_clock_freq(dev);
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}
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ASSERT(clock_speed);
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/* Convert desired baud rate to baud rate register setting. */
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integer_part = (25 * clock_speed) / (4 * baud);
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tmp = (integer_part / 100) << 4;
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fractional_part = integer_part - (100 * (tmp >> 4));
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tmp |= (((fractional_part * 16) + 50) / 100) & ((uint8)0x0F);
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dev->regs->BRR = (uint16)tmp;
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}
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/**
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* @brief Call a function on each USART.
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* @param fn Function to call.
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*/
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void usart_foreach(void (*fn)(usart_dev*)) {
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fn(USART1);
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fn(USART2);
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fn(USART3);
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#ifdef STM32_HIGH_DENSITY
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fn(UART4);
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fn(UART5);
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#endif
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}
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/*
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* Interrupt handlers.
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*/
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void __irq_usart1(void) {
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usart_irq(&usart1_rb, USART1_BASE);
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}
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void __irq_usart2(void) {
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usart_irq(&usart2_rb, USART2_BASE);
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}
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void __irq_usart3(void) {
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usart_irq(&usart3_rb, USART3_BASE);
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}
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#ifdef STM32_HIGH_DENSITY
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void __irq_uart4(void) {
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usart_irq(&uart4_rb, UART4_BASE);
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}
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void __irq_uart5(void) {
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usart_irq(&uart5_rb, UART5_BASE);
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}
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#endif
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