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Add initial setup and USB CDC-ACM serial port

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Based on the following sources:
https://github.com/blacksphere/blackmagic
https://github.com/satoshinm/pill_serial
https://github.com/satoshinm/pill_duck
This commit is contained in:
Satoshi N. M 2018-01-11 20:36:47 -08:00
parent ecf0758ab1
commit ee8f54e915
12 changed files with 1243 additions and 0 deletions
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*.bin
*.hex
*.d
*.elf
*.map
*.o
*.elf
src/version.h
src/mapfile

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[submodule "libopencm3"]
path = libopencm3
url = https://github.com/libopencm3/libopencm3

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under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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ifneq ($(V), 1)
MFLAGS += --no-print-dir
Q := @
endif
all:
$(Q)if [ ! -f libopencm3/Makefile ]; then \
echo "Initialising git submodules..." ;\
git submodule init ;\
git submodule update ;\
fi
$(Q)$(MAKE) $(MFLAGS) -C libopencm3 lib
$(Q)$(MAKE) $(MFLAGS) -C src
clean:
$(Q)$(MAKE) $(MFLAGS) -C libopencm3 $@
$(Q)$(MAKE) $(MFLAGS) -C src $@

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# pill\_6502

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version: 1
test:
override:
- PATH=/home/ubuntu/pill_6502/gcc-arm-none-eabi-7-2017-q4-major/bin/:${PATH} make
- cp src/pill_6502.bin $CIRCLE_ARTIFACTS/
- cp src/pill_6502.elf $CIRCLE_ARTIFACTS/
dependencies:
pre:
- wget -O armgcc.tar.bz2 'https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2017q4/gcc-arm-none-eabi-7-2017-q4-major-linux.tar.bz2?revision=375265d4-e9b5-41c8-bf23-56cbe927e156?product=GNU%20Arm%20Embedded%20Toolchain,64-bit,,Linux,7-2017-q4-major'
- tar -xvjf armgcc.tar.bz2

1
libopencm3 Submodule

@ -0,0 +1 @@
Subproject commit 3922cc7d3ea362b816cc1de6d3287375afbe58aa

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ifneq ($(V), 1)
MAKEFLAGS += --no-print-dir
Q := @
endif
OPT_FLAGS ?= -O2
CFLAGS += -Wall -Wextra -Werror -Wno-char-subscripts\
$(OPT_FLAGS) -std=gnu99 -g3 -MD \
-I.
LDFLAGS += $(OPT_FLAGS)
SRC = \
cdcacm.c \
main.c \
CROSS_COMPILE ?= arm-none-eabi-
CC = $(CROSS_COMPILE)gcc
OBJCOPY = $(CROSS_COMPILE)objcopy
OPT_FLAGS = -Os
CFLAGS += -mcpu=cortex-m3 -mthumb \
-DSTM32F1 -DDISCOVERY_STLINK -I../libopencm3/include \
-I .
LDFLAGS_BOOT := $(LDFLAGS) --specs=nano.specs \
-lopencm3_stm32f1 -Wl,--defsym,_stack=0x20005000 \
-Wl,-T,bluepill.ld -nostartfiles -lc \
-Wl,-Map=mapfile -mthumb -mcpu=cortex-m3 -Wl,-gc-sections \
-L../libopencm3/lib
LDFLAGS = $(LDFLAGS_BOOT)
LDFLAGS += --specs=nosys.specs
all: pill_6502.bin
host_clean:
-$(Q)$(RM) pill_6502.bin
OBJ = $(SRC:.c=.o)
pill_6502.elf: version.h $(OBJ)
@echo " LD $@"
$(Q)$(CC) -o $@ $(OBJ) $(LDFLAGS)
%.o: %.c
@echo " CC $<"
$(Q)$(CC) $(CFLAGS) -c $< -o $@
%.bin: %.elf
@echo " OBJCOPY $@"
$(Q)$(OBJCOPY) -O binary $^ $@
%.hex: %
@echo " OBJCOPY $@"
$(Q)$(OBJCOPY) -O ihex $^ $@
.PHONY: clean host_clean FORCE
clean: host_clean
$(Q)echo " CLEAN"
-$(Q)$(RM) -f *.o *.d *~ *.elf *.bin $(HOSTFILES)
-$(Q)$(RM) -f mapfile version.h
version.h: FORCE
$(Q)echo " GIT version.h"
$(Q)echo "#define FIRMWARE_VERSION \"`git describe --always --dirty`\"" > $@
-include *.d

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/*
* This file is part of the libopenstm32 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 8K
data (rwx) : ORIGIN = 0x08002000, LENGTH = 128K-8K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
}
SECTIONS
{
.user_data (NOLOAD) :
{
. = ALIGN(4);
*(.user_data)
. = ALIGN(4);
} > data
}
/* Include the common ld script from libopenstm32. */
INCLUDE libopencm3_stm32f1.ld

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// vim: tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
*
* 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 <stdlib.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/cdc.h>
#include <string.h>
#include "cdcacm.h"
#include "version.h"
/* Serial ACM interface */
#define CDCACM_PACKET_SIZE 128
#define CDCACM_UART_ENDPOINT 0x03
#define CDCACM_INTR_ENDPOINT 0x84
static const struct usb_endpoint_descriptor uart_comm_endp[] = {{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = CDCACM_INTR_ENDPOINT,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 16,
.bInterval = 255,
}};
static const struct usb_endpoint_descriptor uart_data_endp[] = {{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = CDCACM_UART_ENDPOINT,
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
.wMaxPacketSize = CDCACM_PACKET_SIZE,
.bInterval = 1,
}, {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 0x80 | CDCACM_UART_ENDPOINT,
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
.wMaxPacketSize = CDCACM_PACKET_SIZE,
.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)) uart_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 = 2,
},
.acm = {
.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_ACM,
.bmCapabilities = 2, /* SET_LINE_CODING supported*/
},
.cdc_union = {
.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_UNION,
.bControlInterface = 1,
.bSubordinateInterface0 = 2,
}
};
const struct usb_interface_descriptor uart_comm_iface[] = {{
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_CDC,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
.iInterface = 4,
.endpoint = uart_comm_endp,
.extra = &uart_cdcacm_functional_descriptors,
.extralen = sizeof(uart_cdcacm_functional_descriptors)
}};
const struct usb_interface_descriptor uart_data_iface[] = {{
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 2,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = 0,
.endpoint = uart_data_endp,
}};
const struct usb_iface_assoc_descriptor uart_assoc = {
.bLength = USB_DT_INTERFACE_ASSOCIATION_SIZE,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
.bFirstInterface = 1,
.bInterfaceCount = 2,
.bFunctionClass = USB_CLASS_CDC,
.bFunctionSubClass = USB_CDC_SUBCLASS_ACM,
.bFunctionProtocol = USB_CDC_PROTOCOL_AT,
.iFunction = 0,
};
static void cdcacm_set_modem_state(usbd_device *dev, int iface, bool dsr, bool dcd)
{
char buf[10];
struct usb_cdc_notification *notif = (void*)buf;
/* We echo signals back to host as notification */
notif->bmRequestType = 0xA1;
notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
notif->wValue = 0;
notif->wIndex = iface;
notif->wLength = 2;
buf[8] = (dsr ? 2 : 0) | (dcd ? 1 : 0);
buf[9] = 0;
usbd_ep_write_packet(dev, 0x82 + iface, buf, 10);
}
static int cdcacm_control_request(usbd_device *dev,
struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
void (**complete)(usbd_device *dev, struct usb_setup_data *req))
{
(void)dev;
(void)complete;
(void)buf;
(void)len;
switch(req->bRequest) {
case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
cdcacm_set_modem_state(dev, req->wIndex, true, true);
return 1;
case USB_CDC_REQ_SET_LINE_CODING:
if(*len < sizeof(struct usb_cdc_line_coding))
return 0;
return 1;
}
return 0;
}
static void send_chunked_blocking(char *buf, int len, usbd_device *dev, int endpoint, int max_packet_length) {
uint16_t bytes_written = 0;
uint16_t total_bytes_written = 0;
uint16_t bytes_remaining = len;
do {
uint16_t this_length = bytes_remaining;
if (this_length > max_packet_length) this_length = max_packet_length;
bytes_written = usbd_ep_write_packet(dev, endpoint, buf + total_bytes_written, this_length);
bytes_remaining -= bytes_written;
total_bytes_written += bytes_written;
} while (bytes_remaining > 0);
}
extern char *process_serial_command(char *buf, int len);
static void usbuart_usb_out_cb(usbd_device *dev, uint8_t ep)
{
(void)ep;
char buf[CDCACM_PACKET_SIZE];
char reply_buf[256];
static char typing_buf[2048] = {0};
static int typing_index = 0;
int len = usbd_ep_read_packet(dev, CDCACM_UART_ENDPOINT,
buf, CDCACM_PACKET_SIZE);
int j = 0;
for(int i = 0; i < len; i++) {
gpio_toggle(GPIOC, GPIO13);
// Echo back what was typed
// Enter sends a CR, but an LF is needed to advance to next line
if (buf[i] == '\r') reply_buf[j++] = '\n';
reply_buf[j++] = buf[i];
typing_buf[typing_index++] = buf[i];
if (buf[i] == '\r' || buf[i] == '\n') {
char *response = process_serial_command(typing_buf, typing_index);
typing_index = 0;
for (size_t k = 0; k < strlen(response); ++k) {
reply_buf[j++] = response[k];
}
// prompt
reply_buf[j++] = '>';
reply_buf[j++] = ' ';
}
}
send_chunked_blocking(reply_buf, j, dev, CDCACM_UART_ENDPOINT, CDCACM_PACKET_SIZE);
}
static void usbuart_usb_in_cb(usbd_device *dev, uint8_t ep)
{
(void) dev;
(void) ep;
}
void cdcacm_set_config(usbd_device *dev, uint16_t wValue)
{
(void) wValue;
/* Serial interface */
usbd_ep_setup(dev, CDCACM_UART_ENDPOINT, USB_ENDPOINT_ATTR_BULK,
CDCACM_PACKET_SIZE, usbuart_usb_out_cb);
usbd_ep_setup(dev, 0x80 | CDCACM_UART_ENDPOINT, USB_ENDPOINT_ATTR_BULK,
CDCACM_PACKET_SIZE, usbuart_usb_in_cb);
usbd_ep_setup(dev, CDCACM_INTR_ENDPOINT, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
usbd_register_control_callback(dev,
USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
cdcacm_control_request);
/* Notify the host that DCD is asserted.
* Allows the use of /dev/tty* devices on *BSD/MacOS
*/
cdcacm_set_modem_state(dev, 2, true, true);
}

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// vim: tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab
#include <libopencm3/usb/cdc.h>
extern const struct usb_interface_descriptor uart_comm_iface[];
extern const struct usb_interface_descriptor uart_data_iface[];
extern const struct usb_iface_assoc_descriptor uart_assoc;
void cdcacm_set_config(usbd_device *dev, uint16_t wValue);

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// vim: tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
*
* 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 <stdlib.h>
#include <string.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/hid.h>
#include <libopencm3/usb/cdc.h>
#include "cdcacm.h"
#include "version.h"
static usbd_device *usbd_dev;
const struct usb_device_descriptor dev_descr = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = 0x0200,
.bDeviceClass = 0,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.bMaxPacketSize0 = 64,
.idVendor = 0x05ac,
.idProduct = 0x2227,
.bcdDevice = 0x0200,
.iManufacturer = 1,
.iProduct = 2,
.iSerialNumber = 3,
.bNumConfigurations = 1,
};
const struct usb_interface ifaces[] = {{
.num_altsetting = 1,
.iface_assoc = &uart_assoc,
.altsetting = uart_comm_iface,
}, {
.num_altsetting = 1,
.altsetting = uart_data_iface,
}};
const struct usb_config_descriptor config = {
.bLength = USB_DT_CONFIGURATION_SIZE,
.bDescriptorType = USB_DT_CONFIGURATION,
.wTotalLength = 0,
.bNumInterfaces = sizeof(ifaces)/sizeof(ifaces[0]),
.bConfigurationValue = 1,
.iConfiguration = 0,
.bmAttributes = 0xC0,
.bMaxPower = 0x32,
.interface = ifaces,
};
static const char *usb_strings[] = {
"satoshinm",
"Pill 6502",
"6502",
"Pill 6502 UART Port",
};
void sys_tick_handler(void)
{
gpio_toggle(GPIOC, GPIO13);
}
static void usb_set_config(usbd_device *dev, uint16_t wValue)
{
cdcacm_set_config(dev, wValue);
}
char *process_serial_command(char *buf, int len) {
(void) len;
if (buf[0] == 'v') {
return "Pill 6502 version " FIRMWARE_VERSION;
} else {
return "invalid command, try ? for help";
}
return "";
}
static void setup_clock(void) {
rcc_clock_setup_in_hsi_out_48mhz();
rcc_periph_clock_enable(RCC_GPIOC);
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8);
/* SysTick interrupt every N clock pulses: set reload to N-1
* Period: N / (72 MHz / 8 )
* */
systick_set_reload(8999); // 1 ms
systick_interrupt_enable();
systick_counter_enable();
}
static void setup_gpio(void) {
// Built-in LED on blue pill board, PC13
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
gpio_set(GPIOC, GPIO13);
}
/* Buffer to be used for control requests. */
uint8_t usbd_control_buffer[128];
int main(void)
{
setup_clock();
setup_gpio();
usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev_descr, &config, usb_strings,
sizeof(usb_strings)/sizeof(char *),
usbd_control_buffer, sizeof(usbd_control_buffer));
usbd_register_set_config_callback(usbd_dev, usb_set_config);
while (1)
usbd_poll(usbd_dev);
}