lm4f: Add USB to serial (CDCACM) example
Implements a USB-to-serial adapter, compliant to the CDCACM subclass. UART1 is used for the TX/RX lines. Although UART1 also has lines for flow control, they are not used. Instead, the control lines are implemented in software via GPIOA. Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Alexandru Gagniuc
committed by
Piotr Esden-Tempski
Piotr Esden-Tempski
parent
f5b0aa5638
commit
28f92cce2b
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = usb_to_serial_cdcacm
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LDSCRIPT = ../ek-lm4f120xl.ld
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OBJS += uart.o usb_cdcacm.o
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include ../../Makefile.include
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example demonstrates the following:
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* Using the USB controller
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* Setting up a simple usb to serial converter (CDCACM)
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File list:
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* usb_cdcacm.c - implementation of the CDCACM subclass
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* uart.c - implementation of UART peripheral
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* usb_to_serial_cdcacm.c - glue logic between UART and CDCACM device
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* usb_to_serial_cdcacm.h - common definitions
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Implements a USB-to-serial adapter, compliant to the CDCACM subclass. UART1 is
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used for the TX/RX lines. Although UART1 also has lines for flow control, they
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are not used. Instead, the control lines are implemented in software via GPIOA.
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The following pinout is used:
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Tx <- PB1
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Rx -> PB0
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DCD -> PA2
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DSR -> PA3
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RI -> PA4
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CTS -> PA5 (UNUSED)
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DTR <- PA6
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RTS <- PA7
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Note that the CTS pin is unused. The CDCACM specification does not define a way
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to control this pin, nor does it define a way to switch between flow control
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mechanisms.
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The glue logic in usb_to_serial_cdcacm.c receives requests from both the UART
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and CDCACM interface, and forward them to their destination, while also
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controlling the LEDs
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The green LED is lit as long as either DTR or RTS are high.
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The red LED is lit while the UART is sending data.
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The blue LED is lit while data is read from the UART.
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The red and blue LEDs will only be lit for very short periods of time, thus they
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may be difficult to notice.
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \addtogroup Examples
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*
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*/
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/*
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* Pins handled by hw peripheral:
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* Tx <-> PB1
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* Rx <-> PB0
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* Input pins handled manually via interrupts:
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* DCD <-> PA2
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* DSR <-> PA3
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* RI <-> PA4
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* CTS <-> PA5 (UNUSED)
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* Output pins handled via commands from the host:
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* DTR <-> PA6
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* RTS <-> PA7
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*/
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#include "usb_to_serial_cdcacm.h"
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#include <libopencm3/lm4f/rcc.h>
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#include <libopencm3/lm4f/uart.h>
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#include <libopencm3/lm4f/nvic.h>
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static void uart_ctl_line_setup(void)
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{
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u32 inpins, outpins;
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inpins = PIN_DCD | PIN_DSR | PIN_RI | PIN_CTS;
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outpins = PIN_DTR | PIN_RTS;
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gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
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gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, inpins);
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}
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void uart_init(void)
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{
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/* Enable GPIOA and GPIOB in run mode. */
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periph_clock_enable(RCC_GPIOB);
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periph_clock_enable(RCC_GPIOA);
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uart_ctl_line_setup();
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/* Mux PB0 and PB1 to AF1 (UART1 in this case) */
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gpio_set_af(GPIOB, 1, GPIO0 | GPIO1);
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/* Enable the UART clock */
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periph_clock_enable(RCC_UART1);
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/* Disable the UART while we mess with its setings */
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uart_disable(UART1);
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/* Configure the UART clock source */
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uart_clock_from_piosc(UART1);
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/* We don't make any other settings here. */
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uart_enable(UART1);
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/* Ping us when something comes in */
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uart_enable_rx_interrupt(UART1);
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nvic_enable_irq(NVIC_UART1_IRQ);
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}
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u8 uart_get_ctl_line_state(void)
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{
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return gpio_read(GPIOA, PIN_RI | PIN_DSR | PIN_DCD);
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}
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void uart_set_ctl_line_state(u8 dtr, u8 rts)
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{
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u8 val = 0;
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val |= dtr ? PIN_DTR : 0;
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val |= rts ? PIN_RTS : 0;
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gpio_write(GPIOA, PIN_DTR | PIN_RTS, val);
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}
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void uart1_isr(void)
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{
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u8 rx;
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rx = uart_recv(UART1);
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glue_data_recieved_cb(&rx, 1);
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uart_clear_interrupt_flag(UART1, UART_INT_RX);
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}
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@@ -0,0 +1,303 @@
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
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* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "usb_to_serial_cdcacm.h"
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#include <stdlib.h>
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#include <libopencm3/usb/usbd.h>
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#include <libopencm3/usb/cdc.h>
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#include <libopencm3/lm4f/rcc.h>
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#include <libopencm3/cm3/scb.h>
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#include <libopencm3/lm4f/nvic.h>
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#include <libopencm3/lm4f/usb.h>
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static const struct usb_device_descriptor dev = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = 0x2000,
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.bDeviceClass = USB_CLASS_CDC,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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.bMaxPacketSize0 = 64,
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.idVendor = 0xc03e,
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.idProduct = 0xb007,
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.bcdDevice = 0x2000,
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.iManufacturer = 1,
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.iProduct = 2,
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.iSerialNumber = 3,
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.bNumConfigurations = 1,
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};
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/*
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* This notification endpoint isn't implemented. According to CDC spec it's
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* optional, but its absence causes a NULL pointer dereference in the
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* Linux cdc_acm driver.
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*/
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static const struct usb_endpoint_descriptor comm_endp[] = {{
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x83,
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.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
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.wMaxPacketSize = 16,
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.bInterval = 1,
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}};
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static const struct usb_endpoint_descriptor data_endp[] = {{
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x01,
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.bmAttributes = USB_ENDPOINT_ATTR_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 1,
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}, {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x82,
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.bmAttributes = USB_ENDPOINT_ATTR_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 1,
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}};
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static const struct {
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struct usb_cdc_header_descriptor header;
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struct usb_cdc_call_management_descriptor call_mgmt;
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struct usb_cdc_acm_descriptor acm;
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struct usb_cdc_union_descriptor cdc_union;
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} __attribute__ ((packed)) cdcacm_functional_descriptors = {
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.header = {
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.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
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.bcdCDC = 0x0110,
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},
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.call_mgmt = {
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.bFunctionLength =
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sizeof(struct usb_cdc_call_management_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
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.bmCapabilities = 0,
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.bDataInterface = 1,
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},
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.acm = {
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.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_ACM,
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.bmCapabilities = (1 << 1),
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},
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.cdc_union = {
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.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_UNION,
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.bControlInterface = 0,
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.bSubordinateInterface0 = 1,
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}
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};
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static const struct usb_interface_descriptor comm_iface[] = {{
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_CDC,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
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.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
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.iInterface = 0,
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.endpoint = comm_endp,
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.extra = &cdcacm_functional_descriptors,
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.extralen = sizeof(cdcacm_functional_descriptors)
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}};
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static const struct usb_interface_descriptor data_iface[] = {{
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 1,
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.bAlternateSetting = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_DATA,
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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.iInterface = 0,
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.endpoint = data_endp,
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}};
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static const struct usb_interface ifaces[] = {{
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.num_altsetting = 1,
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.altsetting = comm_iface,
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}, {
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.num_altsetting = 1,
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.altsetting = data_iface,
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}};
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static const struct usb_config_descriptor config = {
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.bLength = USB_DT_CONFIGURATION_SIZE,
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.bDescriptorType = USB_DT_CONFIGURATION,
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.wTotalLength = 0,
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.bNumInterfaces = 2,
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.bConfigurationValue = 1,
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.iConfiguration = 0,
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.bmAttributes = 0x80,
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.bMaxPower = 0x32,
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.interface = ifaces,
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};
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static const char *usb_strings[] = {
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"libopencm3",
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"usb_to_serial_cdcacm",
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"none",
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"DEMO",
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};
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usbd_device *acm_dev;
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u8 usbd_control_buffer[128];
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extern usbd_driver lm4f_usb_driver;
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static int cdcacm_control_request(usbd_device * usbd_dev,
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struct usb_setup_data *req, u8 ** buf,
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u16 * len,
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void (**complete) (usbd_device * usbd_dev,
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struct usb_setup_data *
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req))
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{
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u8 dtr, rts;
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(void)complete;
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(void)buf;
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(void)usbd_dev;
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switch (req->bRequest) {
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case USB_CDC_REQ_SET_CONTROL_LINE_STATE:{
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/*
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* This Linux cdc_acm driver requires this to be implemented
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* even though it's optional in the CDC spec, and we don't
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* advertise it in the ACM functional descriptor.
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*/
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dtr = (req->wValue & (1 << 0)) ? 1 : 0;
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rts = (req->wValue & (1 << 1)) ? 1 : 0;
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glue_set_line_state_cb(dtr, rts);
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return 1;
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}
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case USB_CDC_REQ_SET_LINE_CODING:{
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struct usb_cdc_line_coding *coding;
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||||||
|
if (*len < sizeof(struct usb_cdc_line_coding))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
coding = (struct usb_cdc_line_coding *)*buf;
|
||||||
|
return glue_set_line_coding_cb(coding->dwDTERate,
|
||||||
|
coding->bDataBits,
|
||||||
|
coding->bParityType,
|
||||||
|
coding->bCharFormat);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void cdcacm_data_rx_cb(usbd_device * usbd_dev, u8 ep)
|
||||||
|
{
|
||||||
|
u8 buf[64];
|
||||||
|
|
||||||
|
(void)ep;
|
||||||
|
|
||||||
|
int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64);
|
||||||
|
glue_send_data_cb(buf, len);
|
||||||
|
}
|
||||||
|
|
||||||
|
void cdcacm_send_data(u8 * buf, u16 len)
|
||||||
|
{
|
||||||
|
usbd_ep_write_packet(acm_dev, 0x82, buf, len);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void cdcacm_set_config(usbd_device * usbd_dev, u16 wValue)
|
||||||
|
{
|
||||||
|
(void)wValue;
|
||||||
|
|
||||||
|
usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64,
|
||||||
|
cdcacm_data_rx_cb);
|
||||||
|
usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
|
||||||
|
usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
|
||||||
|
|
||||||
|
usbd_register_control_callback(usbd_dev,
|
||||||
|
USB_REQ_TYPE_CLASS |
|
||||||
|
USB_REQ_TYPE_INTERFACE,
|
||||||
|
USB_REQ_TYPE_TYPE |
|
||||||
|
USB_REQ_TYPE_RECIPIENT,
|
||||||
|
cdcacm_control_request);
|
||||||
|
}
|
||||||
|
|
||||||
|
void cdcacm_line_state_changed_cb(u8 linemask)
|
||||||
|
{
|
||||||
|
const int size = sizeof(struct usb_cdc_notification) + 2;
|
||||||
|
u8 buf[size];
|
||||||
|
|
||||||
|
struct usb_cdc_notification *notify = (void *)buf;
|
||||||
|
notify->bmRequestType = 0xa1;
|
||||||
|
notify->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
|
||||||
|
notify->wValue = 0;
|
||||||
|
notify->wIndex = 1;
|
||||||
|
notify->wLength = 2;
|
||||||
|
u16 *data = (void *)&buf[sizeof(struct usb_cdc_notification)];
|
||||||
|
*data = linemask;
|
||||||
|
|
||||||
|
while (usbd_ep_write_packet(acm_dev, 0x83, buf, size) == size) ;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void usb_pins_setup(void)
|
||||||
|
{
|
||||||
|
/* USB pins are connected to port D */
|
||||||
|
periph_clock_enable(RCC_GPIOD);
|
||||||
|
/* Mux USB pins to their analog function */
|
||||||
|
gpio_mode_setup(GPIOD, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO4 | GPIO5);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void usb_ints_setup(void)
|
||||||
|
{
|
||||||
|
u8 usbints;
|
||||||
|
/* Gimme some interrupts */
|
||||||
|
usbints = USB_INT_RESET | USB_INT_DISCON | USB_INT_RESUME | USB_INT_SUSPEND; //| USB_IM_SOF;
|
||||||
|
usb_enable_interrupts(usbints, 0xff, 0xff);
|
||||||
|
nvic_enable_irq(NVIC_USB0_IRQ);
|
||||||
|
}
|
||||||
|
|
||||||
|
void cdcacm_init(void)
|
||||||
|
{
|
||||||
|
usbd_device *usbd_dev;
|
||||||
|
|
||||||
|
usb_pins_setup();
|
||||||
|
|
||||||
|
usbd_dev = usbd_init(&lm4f_usb_driver, &dev, &config, usb_strings, 4,
|
||||||
|
usbd_control_buffer, sizeof(usbd_control_buffer));
|
||||||
|
acm_dev = usbd_dev;
|
||||||
|
usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
|
||||||
|
|
||||||
|
usb_ints_setup();
|
||||||
|
}
|
||||||
|
|
||||||
|
void usb0_isr(void)
|
||||||
|
{
|
||||||
|
usbd_poll(acm_dev);
|
||||||
|
}
|
||||||
@@ -0,0 +1,206 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopencm3 project.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
|
||||||
|
* Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
|
||||||
|
*
|
||||||
|
* 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 <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**
|
||||||
|
* \addtogroup Examples
|
||||||
|
*
|
||||||
|
* Flashes the Red, Green and Blue diodes on the board, in order.
|
||||||
|
*
|
||||||
|
* RED controlled by PF1
|
||||||
|
* Green controlled by PF3
|
||||||
|
* Blue controlled by PF2
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "usb_to_serial_cdcacm.h"
|
||||||
|
|
||||||
|
#include <libopencm3/lm4f/systemcontrol.h>
|
||||||
|
#include <libopencm3/lm4f/rcc.h>
|
||||||
|
#include <libopencm3/lm4f/gpio.h>
|
||||||
|
#include <libopencm3/lm4f/uart.h>
|
||||||
|
#include <libopencm3/lm4f/nvic.h>
|
||||||
|
#include <libopencm3/cm3/scb.h>
|
||||||
|
|
||||||
|
#define PLL_DIV_80MHZ 5
|
||||||
|
/* This is how the RGB LED is connected on the stellaris launchpad */
|
||||||
|
#define RGB_PORT GPIOF
|
||||||
|
enum {
|
||||||
|
LED_R = GPIO1,
|
||||||
|
LED_G = GPIO3,
|
||||||
|
LED_B = GPIO2,
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Clock setup:
|
||||||
|
* Take the main crystal oscillator at 16MHz, run it through the PLL, and divide
|
||||||
|
* the 400MHz PLL clock to get a system clock of 80MHz.
|
||||||
|
*/
|
||||||
|
static void clock_setup(void)
|
||||||
|
{
|
||||||
|
rcc_sysclk_config(OSCSRC_MOSC, XTAL_16M, PLL_DIV_80MHZ);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* GPIO setup:
|
||||||
|
* Enable the pins driving the RGB LED as outputs.
|
||||||
|
*/
|
||||||
|
static void gpio_setup(void)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* Configure GPIOF
|
||||||
|
* This port is used to control the RGB LED
|
||||||
|
*/
|
||||||
|
periph_clock_enable(RCC_GPIOF);
|
||||||
|
const u32 opins = (LED_R | LED_G | LED_B);
|
||||||
|
|
||||||
|
gpio_mode_setup(RGB_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, opins);
|
||||||
|
gpio_set_output_config(RGB_PORT, GPIO_OTYPE_PP, GPIO_DRIVE_2MA, opins);
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
static void cm4f_enable_fpu(void)
|
||||||
|
{
|
||||||
|
/* Enable FPU */
|
||||||
|
SCB_CPACR |= SCB_CPACR_FULL * (SCB_CPACR_CP10 | SCB_CPACR_CP11);
|
||||||
|
/* Wait for store to complete */
|
||||||
|
__asm__("DSB");
|
||||||
|
/* Reset pipeline. Now the FPU is enabled */
|
||||||
|
__asm__("ISB");
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
void glue_data_recieved_cb(u8 * buf, u16 len)
|
||||||
|
{
|
||||||
|
/* Blue LED indicates data coming in */
|
||||||
|
gpio_set(RGB_PORT, LED_B);
|
||||||
|
cdcacm_send_data(buf, len);
|
||||||
|
gpio_clear(RGB_PORT, LED_B);
|
||||||
|
}
|
||||||
|
|
||||||
|
void glue_set_line_state_cb(u8 dtr, u8 rts)
|
||||||
|
{
|
||||||
|
/* Green LED indicated one of the control lines are active */
|
||||||
|
if (dtr || rts)
|
||||||
|
gpio_set(RGB_PORT, LED_G);
|
||||||
|
else
|
||||||
|
gpio_clear(RGB_PORT, LED_G);
|
||||||
|
|
||||||
|
uart_set_ctl_line_state(dtr, rts);
|
||||||
|
}
|
||||||
|
|
||||||
|
int glue_set_line_coding_cb(u32 baud, u8 databits,
|
||||||
|
enum usb_cdc_line_coding_bParityType cdc_parity,
|
||||||
|
enum usb_cdc_line_coding_bCharFormat cdc_stopbits)
|
||||||
|
{
|
||||||
|
enum uart_parity parity;
|
||||||
|
u8 uart_stopbits;
|
||||||
|
|
||||||
|
if (databits < 5 || databits > 8)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
switch (cdc_parity) {
|
||||||
|
case USB_CDC_NO_PARITY:
|
||||||
|
parity = UART_PARITY_NONE;
|
||||||
|
break;
|
||||||
|
case USB_CDC_ODD_PARITY:
|
||||||
|
parity = UART_PARITY_ODD;
|
||||||
|
break;
|
||||||
|
case USB_CDC_EVEN_PARITY:
|
||||||
|
parity = UART_PARITY_EVEN;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
switch (cdc_stopbits) {
|
||||||
|
case USB_CDC_1_STOP_BITS:
|
||||||
|
uart_stopbits = 1;
|
||||||
|
break;
|
||||||
|
case USB_CDC_2_STOP_BITS:
|
||||||
|
uart_stopbits = 2;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Disable the UART while we mess with its settings */
|
||||||
|
uart_disable(UART1);
|
||||||
|
/* Set communication parameters */
|
||||||
|
uart_set_baudrate(UART1, baud);
|
||||||
|
uart_set_databits(UART1, databits);
|
||||||
|
uart_set_parity(UART1, parity);
|
||||||
|
uart_set_stopbits(UART1, uart_stopbits);
|
||||||
|
/* Back to work. */
|
||||||
|
uart_enable(UART1);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
void glue_send_data_cb(u8 * buf, u16 len)
|
||||||
|
{
|
||||||
|
int i;
|
||||||
|
|
||||||
|
/* Red LED indicates data going out */
|
||||||
|
gpio_set(RGB_PORT, LED_R);
|
||||||
|
|
||||||
|
for (i = 0; i < len; i++) {
|
||||||
|
uart_send_blocking(UART1, buf[i]);
|
||||||
|
}
|
||||||
|
|
||||||
|
gpio_clear(RGB_PORT, LED_R);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void mainloop(void)
|
||||||
|
{
|
||||||
|
u8 linestate, cdcacmstate;
|
||||||
|
static u8 oldlinestate = 0;
|
||||||
|
|
||||||
|
/* See if the state of control lines has changed */
|
||||||
|
linestate = uart_get_ctl_line_state();
|
||||||
|
if (oldlinestate != linestate) {
|
||||||
|
/* Inform host of state change */
|
||||||
|
cdcacmstate = 0;
|
||||||
|
if (linestate & PIN_RI)
|
||||||
|
cdcacmstate |= CDCACM_RI;
|
||||||
|
if (linestate & PIN_DSR)
|
||||||
|
cdcacmstate |= CDCACM_DSR;
|
||||||
|
if (linestate & PIN_DCD)
|
||||||
|
cdcacmstate |= CDCACM_DCD;
|
||||||
|
|
||||||
|
cdcacm_line_state_changed_cb(cdcacmstate);
|
||||||
|
}
|
||||||
|
oldlinestate = linestate;
|
||||||
|
}
|
||||||
|
|
||||||
|
int main(void)
|
||||||
|
{
|
||||||
|
gpio_enable_ahb_aperture();
|
||||||
|
clock_setup();
|
||||||
|
gpio_setup();
|
||||||
|
|
||||||
|
cdcacm_init();
|
||||||
|
uart_init();
|
||||||
|
|
||||||
|
cm4f_enable_fpu();
|
||||||
|
|
||||||
|
while (1)
|
||||||
|
mainloop();
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
@@ -0,0 +1,90 @@
|
|||||||
|
/*
|
||||||
|
* This file is part of the libopencm3 project.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
|
||||||
|
*
|
||||||
|
* 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 <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**@{*/
|
||||||
|
|
||||||
|
#ifndef __STELLARIS_EK_LM4F120XL_USB_TO_SERIAL_CDCACM_H
|
||||||
|
#define __STELLARIS_EK_LM4F120XL_USB_TO_SERIAL_CDCACM_H
|
||||||
|
|
||||||
|
#include <libopencm3/cm3/common.h>
|
||||||
|
#include <libopencm3/lm4f/gpio.h>
|
||||||
|
#include <libopencm3/usb/cdc.h>
|
||||||
|
|
||||||
|
/* =============================================================================
|
||||||
|
* Definitions missing from cdc.h
|
||||||
|
*
|
||||||
|
* TODO: Integrate those definitions into cdc.h
|
||||||
|
* ---------------------------------------------------------------------------*/
|
||||||
|
|
||||||
|
/* Table 17: Line Coding Structure */
|
||||||
|
enum usb_cdc_line_coding_bCharFormat {
|
||||||
|
USB_CDC_1_STOP_BITS = 0,
|
||||||
|
USB_CDC_1_5_STOP_BITS = 1,
|
||||||
|
USB_CDC_2_STOP_BITS = 2,
|
||||||
|
};
|
||||||
|
|
||||||
|
enum usb_cdc_line_coding_bParityType {
|
||||||
|
USB_CDC_NO_PARITY = 0,
|
||||||
|
USB_CDC_ODD_PARITY = 1,
|
||||||
|
USB_CDC_EVEN_PARITY = 2,
|
||||||
|
USB_CDC_MARK_PARITY = 3,
|
||||||
|
USB_CDC_SPACE_PARITY = 4,
|
||||||
|
};
|
||||||
|
|
||||||
|
/* =============================================================================
|
||||||
|
* UART control
|
||||||
|
* ---------------------------------------------------------------------------*/
|
||||||
|
enum rs232pin {
|
||||||
|
PIN_DCD = GPIO2,
|
||||||
|
PIN_DSR = GPIO3,
|
||||||
|
PIN_RI = GPIO4,
|
||||||
|
PIN_CTS = GPIO5,
|
||||||
|
PIN_DTR = GPIO6,
|
||||||
|
PIN_RTS = GPIO7,
|
||||||
|
};
|
||||||
|
|
||||||
|
void uart_init(void);
|
||||||
|
u8 uart_get_ctl_line_state(void);
|
||||||
|
void uart_set_ctl_line_state(u8 dtr, u8 rts);
|
||||||
|
/* =============================================================================
|
||||||
|
* CDCACM control
|
||||||
|
* ---------------------------------------------------------------------------*/
|
||||||
|
enum cdc_serial_state_line {
|
||||||
|
CDCACM_DCD = (1 << 0),
|
||||||
|
CDCACM_DSR = (1 << 1),
|
||||||
|
CDCACM_RI = (1 << 3),
|
||||||
|
};
|
||||||
|
|
||||||
|
void cdcacm_init(void);
|
||||||
|
void cdcacm_line_state_changed_cb(u8 linemask);
|
||||||
|
void cdcacm_send_data(u8 *buf, u16 len);
|
||||||
|
/* =============================================================================
|
||||||
|
* CDCACM <-> UART glue
|
||||||
|
* ---------------------------------------------------------------------------*/
|
||||||
|
void glue_data_recieved_cb(u8 *buf, u16 len);
|
||||||
|
void glue_set_line_state_cb(u8 dtr, u8 rts);
|
||||||
|
int glue_set_line_coding_cb(u32 baud, u8 databits,
|
||||||
|
enum usb_cdc_line_coding_bParityType cdc_parity,
|
||||||
|
enum usb_cdc_line_coding_bCharFormat cdc_stopbits);
|
||||||
|
void glue_send_data_cb(u8 *buf, u16 len);
|
||||||
|
|
||||||
|
#endif /* __STELLARIS_EK_LM4F120XL_USB_TO_SERIAL_CDCACM_H */
|
||||||
|
|
||||||
|
/**@}*/
|
||||||
|
|
||||||
Reference in New Issue
Block a user