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
@@ -0,0 +1,27 @@
|
||||
##
|
||||
## 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/>.
|
||||
##
|
||||
|
||||
BINARY = usb_to_serial_cdcacm
|
||||
|
||||
LDSCRIPT = ../ek-lm4f120xl.ld
|
||||
|
||||
|
||||
OBJS += uart.o usb_cdcacm.o
|
||||
|
||||
include ../../Makefile.include
|
||||
@@ -0,0 +1,42 @@
|
||||
------------------------------------------------------------------------------
|
||||
README
|
||||
------------------------------------------------------------------------------
|
||||
|
||||
This example demonstrates the following:
|
||||
* Using the USB controller
|
||||
* Setting up a simple usb to serial converter (CDCACM)
|
||||
|
||||
File list:
|
||||
* usb_cdcacm.c - implementation of the CDCACM subclass
|
||||
* uart.c - implementation of UART peripheral
|
||||
* usb_to_serial_cdcacm.c - glue logic between UART and CDCACM device
|
||||
* usb_to_serial_cdcacm.h - common definitions
|
||||
|
||||
|
||||
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.
|
||||
|
||||
The following pinout is used:
|
||||
Tx <- PB1
|
||||
Rx -> PB0
|
||||
DCD -> PA2
|
||||
DSR -> PA3
|
||||
RI -> PA4
|
||||
CTS -> PA5 (UNUSED)
|
||||
DTR <- PA6
|
||||
RTS <- PA7
|
||||
|
||||
Note that the CTS pin is unused. The CDCACM specification does not define a way
|
||||
to control this pin, nor does it define a way to switch between flow control
|
||||
mechanisms.
|
||||
|
||||
The glue logic in usb_to_serial_cdcacm.c receives requests from both the UART
|
||||
and CDCACM interface, and forward them to their destination, while also
|
||||
controlling the LEDs
|
||||
|
||||
The green LED is lit as long as either DTR or RTS are high.
|
||||
The red LED is lit while the UART is sending data.
|
||||
The blue LED is lit while data is read from the UART.
|
||||
The red and blue LEDs will only be lit for very short periods of time, thus they
|
||||
may be difficult to notice.
|
||||
@@ -0,0 +1,99 @@
|
||||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* 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
|
||||
*
|
||||
*/
|
||||
/*
|
||||
* Pins handled by hw peripheral:
|
||||
* Tx <-> PB1
|
||||
* Rx <-> PB0
|
||||
* Input pins handled manually via interrupts:
|
||||
* DCD <-> PA2
|
||||
* DSR <-> PA3
|
||||
* RI <-> PA4
|
||||
* CTS <-> PA5 (UNUSED)
|
||||
* Output pins handled via commands from the host:
|
||||
* DTR <-> PA6
|
||||
* RTS <-> PA7
|
||||
*/
|
||||
|
||||
#include "usb_to_serial_cdcacm.h"
|
||||
|
||||
#include <libopencm3/lm4f/rcc.h>
|
||||
#include <libopencm3/lm4f/uart.h>
|
||||
#include <libopencm3/lm4f/nvic.h>
|
||||
|
||||
static void uart_ctl_line_setup(void)
|
||||
{
|
||||
u32 inpins, outpins;
|
||||
|
||||
inpins = PIN_DCD | PIN_DSR | PIN_RI | PIN_CTS;
|
||||
outpins = PIN_DTR | PIN_RTS;
|
||||
|
||||
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
|
||||
gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, inpins);
|
||||
}
|
||||
|
||||
void uart_init(void)
|
||||
{
|
||||
/* Enable GPIOA and GPIOB in run mode. */
|
||||
periph_clock_enable(RCC_GPIOB);
|
||||
periph_clock_enable(RCC_GPIOA);
|
||||
uart_ctl_line_setup();
|
||||
/* Mux PB0 and PB1 to AF1 (UART1 in this case) */
|
||||
gpio_set_af(GPIOB, 1, GPIO0 | GPIO1);
|
||||
|
||||
/* Enable the UART clock */
|
||||
periph_clock_enable(RCC_UART1);
|
||||
/* Disable the UART while we mess with its setings */
|
||||
uart_disable(UART1);
|
||||
/* Configure the UART clock source */
|
||||
uart_clock_from_piosc(UART1);
|
||||
/* We don't make any other settings here. */
|
||||
uart_enable(UART1);
|
||||
|
||||
/* Ping us when something comes in */
|
||||
uart_enable_rx_interrupt(UART1);
|
||||
nvic_enable_irq(NVIC_UART1_IRQ);
|
||||
}
|
||||
|
||||
u8 uart_get_ctl_line_state(void)
|
||||
{
|
||||
return gpio_read(GPIOA, PIN_RI | PIN_DSR | PIN_DCD);
|
||||
}
|
||||
|
||||
void uart_set_ctl_line_state(u8 dtr, u8 rts)
|
||||
{
|
||||
u8 val = 0;
|
||||
|
||||
val |= dtr ? PIN_DTR : 0;
|
||||
val |= rts ? PIN_RTS : 0;
|
||||
|
||||
gpio_write(GPIOA, PIN_DTR | PIN_RTS, val);
|
||||
}
|
||||
|
||||
void uart1_isr(void)
|
||||
{
|
||||
u8 rx;
|
||||
rx = uart_recv(UART1);
|
||||
glue_data_recieved_cb(&rx, 1);
|
||||
uart_clear_interrupt_flag(UART1, UART_INT_RX);
|
||||
}
|
||||
@@ -0,0 +1,303 @@
|
||||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
|
||||
* Copyright (C) 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/>.
|
||||
*/
|
||||
|
||||
#include "usb_to_serial_cdcacm.h"
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <libopencm3/usb/usbd.h>
|
||||
#include <libopencm3/usb/cdc.h>
|
||||
#include <libopencm3/lm4f/rcc.h>
|
||||
#include <libopencm3/cm3/scb.h>
|
||||
#include <libopencm3/lm4f/nvic.h>
|
||||
#include <libopencm3/lm4f/usb.h>
|
||||
|
||||
static const struct usb_device_descriptor dev = {
|
||||
.bLength = USB_DT_DEVICE_SIZE,
|
||||
.bDescriptorType = USB_DT_DEVICE,
|
||||
.bcdUSB = 0x2000,
|
||||
.bDeviceClass = USB_CLASS_CDC,
|
||||
.bDeviceSubClass = 0,
|
||||
.bDeviceProtocol = 0,
|
||||
.bMaxPacketSize0 = 64,
|
||||
.idVendor = 0xc03e,
|
||||
.idProduct = 0xb007,
|
||||
.bcdDevice = 0x2000,
|
||||
.iManufacturer = 1,
|
||||
.iProduct = 2,
|
||||
.iSerialNumber = 3,
|
||||
.bNumConfigurations = 1,
|
||||
};
|
||||
|
||||
/*
|
||||
* This notification endpoint isn't implemented. According to CDC spec it's
|
||||
* optional, but its absence causes a NULL pointer dereference in the
|
||||
* Linux cdc_acm driver.
|
||||
*/
|
||||
static const struct usb_endpoint_descriptor comm_endp[] = {{
|
||||
.bLength = USB_DT_ENDPOINT_SIZE,
|
||||
.bDescriptorType = USB_DT_ENDPOINT,
|
||||
.bEndpointAddress = 0x83,
|
||||
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
|
||||
.wMaxPacketSize = 16,
|
||||
.bInterval = 1,
|
||||
}};
|
||||
|
||||
static const struct usb_endpoint_descriptor data_endp[] = {{
|
||||
.bLength = USB_DT_ENDPOINT_SIZE,
|
||||
.bDescriptorType = USB_DT_ENDPOINT,
|
||||
.bEndpointAddress = 0x01,
|
||||
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
|
||||
.wMaxPacketSize = 64,
|
||||
.bInterval = 1,
|
||||
}, {
|
||||
.bLength = USB_DT_ENDPOINT_SIZE,
|
||||
.bDescriptorType = USB_DT_ENDPOINT,
|
||||
.bEndpointAddress = 0x82,
|
||||
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
|
||||
.wMaxPacketSize = 64,
|
||||
.bInterval = 1,
|
||||
}};
|
||||
|
||||
static const struct {
|
||||
struct usb_cdc_header_descriptor header;
|
||||
struct usb_cdc_call_management_descriptor call_mgmt;
|
||||
struct usb_cdc_acm_descriptor acm;
|
||||
struct usb_cdc_union_descriptor cdc_union;
|
||||
} __attribute__ ((packed)) cdcacm_functional_descriptors = {
|
||||
.header = {
|
||||
.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
|
||||
.bDescriptorType = CS_INTERFACE,
|
||||
.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
|
||||
.bcdCDC = 0x0110,
|
||||
},
|
||||
.call_mgmt = {
|
||||
.bFunctionLength =
|
||||
sizeof(struct usb_cdc_call_management_descriptor),
|
||||
.bDescriptorType = CS_INTERFACE,
|
||||
.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
|
||||
.bmCapabilities = 0,
|
||||
.bDataInterface = 1,
|
||||
},
|
||||
.acm = {
|
||||
.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
|
||||
.bDescriptorType = CS_INTERFACE,
|
||||
.bDescriptorSubtype = USB_CDC_TYPE_ACM,
|
||||
.bmCapabilities = (1 << 1),
|
||||
},
|
||||
.cdc_union = {
|
||||
.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
|
||||
.bDescriptorType = CS_INTERFACE,
|
||||
.bDescriptorSubtype = USB_CDC_TYPE_UNION,
|
||||
.bControlInterface = 0,
|
||||
.bSubordinateInterface0 = 1,
|
||||
}
|
||||
};
|
||||
|
||||
static const struct usb_interface_descriptor comm_iface[] = {{
|
||||
.bLength = USB_DT_INTERFACE_SIZE,
|
||||
.bDescriptorType = USB_DT_INTERFACE,
|
||||
.bInterfaceNumber = 0,
|
||||
.bAlternateSetting = 0,
|
||||
.bNumEndpoints = 1,
|
||||
.bInterfaceClass = USB_CLASS_CDC,
|
||||
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
|
||||
.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
|
||||
.iInterface = 0,
|
||||
|
||||
.endpoint = comm_endp,
|
||||
|
||||
.extra = &cdcacm_functional_descriptors,
|
||||
.extralen = sizeof(cdcacm_functional_descriptors)
|
||||
}};
|
||||
|
||||
static const struct usb_interface_descriptor data_iface[] = {{
|
||||
.bLength = USB_DT_INTERFACE_SIZE,
|
||||
.bDescriptorType = USB_DT_INTERFACE,
|
||||
.bInterfaceNumber = 1,
|
||||
.bAlternateSetting = 0,
|
||||
.bNumEndpoints = 2,
|
||||
.bInterfaceClass = USB_CLASS_DATA,
|
||||
.bInterfaceSubClass = 0,
|
||||
.bInterfaceProtocol = 0,
|
||||
.iInterface = 0,
|
||||
|
||||
.endpoint = data_endp,
|
||||
}};
|
||||
|
||||
static const struct usb_interface ifaces[] = {{
|
||||
.num_altsetting = 1,
|
||||
.altsetting = comm_iface,
|
||||
}, {
|
||||
.num_altsetting = 1,
|
||||
.altsetting = data_iface,
|
||||
}};
|
||||
|
||||
static const struct usb_config_descriptor config = {
|
||||
.bLength = USB_DT_CONFIGURATION_SIZE,
|
||||
.bDescriptorType = USB_DT_CONFIGURATION,
|
||||
.wTotalLength = 0,
|
||||
.bNumInterfaces = 2,
|
||||
.bConfigurationValue = 1,
|
||||
.iConfiguration = 0,
|
||||
.bmAttributes = 0x80,
|
||||
.bMaxPower = 0x32,
|
||||
|
||||
.interface = ifaces,
|
||||
};
|
||||
|
||||
static const char *usb_strings[] = {
|
||||
"libopencm3",
|
||||
"usb_to_serial_cdcacm",
|
||||
"none",
|
||||
"DEMO",
|
||||
};
|
||||
|
||||
usbd_device *acm_dev;
|
||||
u8 usbd_control_buffer[128];
|
||||
extern usbd_driver lm4f_usb_driver;
|
||||
|
||||
static int cdcacm_control_request(usbd_device * usbd_dev,
|
||||
struct usb_setup_data *req, u8 ** buf,
|
||||
u16 * len,
|
||||
void (**complete) (usbd_device * usbd_dev,
|
||||
struct usb_setup_data *
|
||||
req))
|
||||
{
|
||||
u8 dtr, rts;
|
||||
|
||||
(void)complete;
|
||||
(void)buf;
|
||||
(void)usbd_dev;
|
||||
|
||||
switch (req->bRequest) {
|
||||
case USB_CDC_REQ_SET_CONTROL_LINE_STATE:{
|
||||
/*
|
||||
* This Linux cdc_acm driver requires this to be implemented
|
||||
* even though it's optional in the CDC spec, and we don't
|
||||
* advertise it in the ACM functional descriptor.
|
||||
*/
|
||||
|
||||
dtr = (req->wValue & (1 << 0)) ? 1 : 0;
|
||||
rts = (req->wValue & (1 << 1)) ? 1 : 0;
|
||||
|
||||
glue_set_line_state_cb(dtr, rts);
|
||||
|
||||
return 1;
|
||||
}
|
||||
case USB_CDC_REQ_SET_LINE_CODING:{
|
||||
struct usb_cdc_line_coding *coding;
|
||||
|
||||
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