*/
#include "util.h"
+#include "interface.h"
#include <libopencm3/cm3/cortex.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/cm3/systick.h>
+#include <libopencm3/cm3/scb.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/desig.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/timer.h>
#include <libopencm3/stm32/usart.h>
+#include <libopencm3/usb/dfu.h>
#include <libopencm3/usb/usbd.h>
#include <string.h>
+/*** Hardware init ***/
+
static void clock_init(void)
{
rcc_clock_setup_in_hse_8mhz_out_72mhz();
rcc_periph_clock_enable(RCC_GPIOB);
rcc_periph_clock_enable(RCC_GPIOC);
rcc_periph_clock_enable(RCC_USART1);
+ rcc_periph_clock_enable(RCC_USART3);
rcc_periph_clock_enable(RCC_USB);
rcc_periph_reset_pulse(RST_GPIOA);
rcc_periph_reset_pulse(RST_GPIOB);
rcc_periph_reset_pulse(RST_GPIOC);
rcc_periph_reset_pulse(RST_USART1);
+ rcc_periph_reset_pulse(RST_USART3);
rcc_periph_reset_pulse(RST_USB);
}
static void gpio_init(void)
{
// PA9 = TXD1 for debugging console
- gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
-
// PA10 = RXD1 for debugging console
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO10);
// PC13 = BluePill LED
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
gpio_clear(GPIOC, GPIO13);
+
+ // PB0 = yellow LED*, PB1 = green LED*
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO0 | GPIO1);
+ gpio_set(GPIOB, GPIO0 | GPIO1);
+
+ // PB10 = TXD3 for BSB
+ // PB11 = RXD3 for BSB
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, GPIO10);
+ gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO11);
+}
+
+static void usart_init(void)
+{
+ usart_set_baudrate(USART1, 115200);
+ usart_set_databits(USART1, 8);
+ usart_set_stopbits(USART1, USART_STOPBITS_1);
+ usart_set_mode(USART1, USART_MODE_TX);
+ usart_set_parity(USART1, USART_PARITY_NONE);
+ usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+ usart_enable(USART1);
}
+/*** System ticks ***/
+
static volatile u32 ms_ticks;
void sys_tick_handler(void)
static void tick_init(void)
{
- systick_set_frequency(1000, 72000000);
+ systick_set_frequency(1000, CPU_CLOCK_MHZ * 1000000);
systick_counter_enable();
systick_interrupt_enable();
}
;
}
-static void usart_init(void)
+/*** Random generator ***/
+
+static u32 rng_state;
+
+static u32 random_u32(void)
{
- usart_set_baudrate(USART1, 115200);
- usart_set_databits(USART1, 8);
- usart_set_stopbits(USART1, USART_STOPBITS_1);
- usart_set_mode(USART1, USART_MODE_TX_RX);
- usart_set_parity(USART1, USART_PARITY_NONE);
- usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+ rng_state *= 2654289733;
+ return rng_state;
+}
- usart_enable(USART1);
+static void random_init(void)
+{
+ u32 desig[3];
+ desig_get_unique_id(desig);
+ rng_state = desig[0] ^ desig[1] ^ desig[2];
+}
+
+/*** BSB ***/
+
+#define BSB_MAX_SIZE 32
+#define BSB_RX_TIMEOUT 10 // If no byte was received for this time, end the current frame [ms]
+#define BSB_TX_IDLE_LINE 100 // Consider the line idle if no byte was received for this time [ms]
+#define BSB_TX_MAX_ATTEMPTS 3
+#define BSB_TX_WAIT_LOG 8 // base 2 log of pre-frame waiting time in ms
+#define BSB_TX_TIMEOUT 10000 // Total time to transmit a frame including all retries and waiting for reply [ms]
+#define BSB_REPLY_TIMEOUT 1000 // How long to wait for a reply [ms]
+
+#undef DEBUG_BSB
+#ifdef DEBUG_BSB
+#define BSB_DEBUG(x) debug_putc(x)
+#else
+#define BSB_DEBUG(x) do { } while (0)
+#endif
+
+struct bsb_state {
+ byte rx_len; // Bytes received so far
+ byte rx_led; // Countdown to turning RX LED off
+ u16 rx_crc;
+ volatile u32 rx_timestamp; // Last byte received
+
+ byte tx_state; // TX_STATE_xxx
+ byte tx_len;
+ byte tx_send_index;
+ byte tx_check_index;
+ byte tx_attempts;
+ byte tx_result; // TX_RESULT_xxx
+ u32 tx_start_timestamp;
+ u32 tx_ticks_to_send;
+ u32 tx_end_timestamp;
+ u32 reply_type_mask; // Expected reply types (0=no reply)
+
+ byte rx_buf[BSB_MAX_SIZE];
+ byte tx_buf[BSB_MAX_SIZE];
+};
+
+static struct bsb_state bsb;
+
+// Passing received frames and status codes to the main loop
+static byte bsb_rx_status_and_frame[1 + BSB_MAX_SIZE];
+static volatile byte bsb_rx_frame_len;
+static byte bsb_tx_result;
+
+enum bsb_tx_state {
+ TX_STATE_OFF,
+ TX_STATE_WAITING_FOR_IDLE_LINE,
+ TX_STATE_PRE_PACKET_DELAY,
+ TX_STATE_SENDING,
+ TX_STATE_SENT,
+ TX_STATE_WAITING_FOR_REPLY,
+ TX_STATE_COLLISION,
+};
+
+static struct bsb_stats bsb_stats;
+
+static void bsb_attempt_tx(void);
+
+static u16 bsb_crc_update(u16 crc, byte data)
+{
+ crc = crc ^ (data << 8);
+ for (uint i=0; i<8; i++) {
+ if (crc & 0x8000)
+ crc = (crc << 1) ^ 0x1021;
+ else
+ crc <<= 1;
+ }
+ return crc;
+}
+
+void usart3_isr(void)
+{
+ u32 status = USART_SR(USART3);
+
+ if (status & USART_SR_RXNE) {
+ uint ch = ~usart_recv(USART3) & 0xff;
+ bsb.rx_timestamp = ms_ticks;
+#ifdef DEBUG_BSB
+ debug_printf(" %02x", ch);
+#endif
+
+ if (bsb.tx_state == TX_STATE_SENDING) {
+ // We are hearing the echo of a transmitted packet, check it for collisions
+ if (status & (USART_SR_FE | USART_SR_ORE | USART_SR_NE)) {
+ BSB_DEBUG('e');
+ bsb.tx_state = TX_STATE_COLLISION;
+ } else if (ch == bsb.tx_buf[bsb.tx_check_index++]) {
+ if (bsb.tx_check_index >= bsb.tx_len) {
+ BSB_DEBUG('d');
+ bsb.tx_state = TX_STATE_SENT;
+ }
+ } else {
+ BSB_DEBUG('c');
+ bsb.tx_state = TX_STATE_COLLISION;
+ }
+ } else {
+ // Regular receive
+ if (status & (USART_SR_FE | USART_SR_ORE | USART_SR_NE)) {
+ bsb_stats.rx_errors++;
+ bsb.rx_len = 0;
+ } else if (!bsb.rx_len) {
+ // Start of frame
+ if (ch == 0xdc) {
+ bsb.rx_buf[bsb.rx_len++] = ch;
+ bsb.rx_crc = bsb_crc_update(0, ch);
+ BSB_DEBUG('<');
+ } else {
+ bsb_stats.rx_noise++;
+ BSB_DEBUG('?');
+ }
+ } else {
+ bsb.rx_buf[bsb.rx_len++] = ch;
+ bsb.rx_crc = bsb_crc_update(bsb.rx_crc, ch);
+ if (bsb.rx_len < 4) {
+ // First three bytes: SOF, source addr, destination addr
+ } else if (bsb.rx_len == 4) {
+ // Received length byte
+ if (bsb.rx_buf[BF_LEN] < 7 || bsb.rx_buf[BF_LEN] > BSB_MAX_SIZE) {
+ bsb_stats.rx_invalid++;
+ bsb.rx_len = 0;
+ BSB_DEBUG('L');
+ }
+ } else if (bsb.rx_len == bsb.rx_buf[BF_LEN]) {
+ // Received a complete frame: check CRC and pass it to the main loop
+ if (bsb.rx_crc) {
+ bsb_stats.rx_bad_crc++;
+ BSB_DEBUG('C');
+ } else {
+ if (bsb_rx_frame_len) {
+ // The previous one was not sent yet
+ bsb_stats.rx_overruns++;
+ BSB_DEBUG('O');
+ } else {
+ bsb_rx_frame_len = bsb.rx_buf[BF_LEN];
+ memcpy(bsb_rx_status_and_frame + 1, bsb.rx_buf, bsb_rx_frame_len);
+ bsb_stats.rx_ok++;
+ BSB_DEBUG('.');
+ // Will match with expected replies in main loop
+ }
+ gpio_clear(GPIOB, GPIO1);
+ bsb.rx_led = 100;
+ }
+ bsb.rx_len = 0;
+ }
+ }
+ }
+ }
+
+ if (status & USART_SR_TXE) {
+ if (bsb.tx_state == TX_STATE_SENDING && bsb.tx_send_index < bsb.tx_len) {
+ BSB_DEBUG('>');
+ usart_send(USART3, bsb.tx_buf[bsb.tx_send_index++] ^ 0xff);
+ } else {
+ usart_disable_tx_interrupt(USART3);
+ // Main loop will be notified by receiving the echo of our frame,
+ // so we do not need to wait for the "transmit complete" flag.
+ }
+ }
+}
+
+static void bsb_rx_step(void)
+{
+ cm_disable_interrupts();
+ barrier();
+ if (bsb.rx_len && ms_ticks - bsb.rx_timestamp >= BSB_RX_TIMEOUT) {
+ bsb.rx_len = 0;
+ bsb_stats.rx_timeouts++;
+ BSB_DEBUG('T');
+ }
+ if (bsb.rx_led) {
+ if (!--bsb.rx_led)
+ gpio_set(GPIOB, GPIO1);
+ }
+ cm_enable_interrupts();
+}
+
+static void bsb_tx_step(void)
+{
+ switch (bsb.tx_state) {
+ case TX_STATE_WAITING_FOR_IDLE_LINE:
+ if (ms_ticks - bsb.rx_timestamp < BSB_TX_IDLE_LINE)
+ return;
+ bsb.tx_state = TX_STATE_PRE_PACKET_DELAY;
+ BSB_DEBUG('i');
+ // Fall thru
+ case TX_STATE_PRE_PACKET_DELAY:
+ if (ms_ticks - bsb.tx_start_timestamp > BSB_TX_TIMEOUT) {
+ bsb.tx_state = TX_STATE_OFF;
+ bsb_tx_result = TX_RESULT_TIMEOUT;
+ bsb_stats.tx_timeouts++;
+ return;
+ }
+ if (ms_ticks - bsb.rx_timestamp < BSB_TX_IDLE_LINE) {
+ bsb.tx_state = TX_STATE_WAITING_FOR_IDLE_LINE;
+ BSB_DEBUG('n');
+ return;
+ }
+ if (--bsb.tx_ticks_to_send)
+ return;
+ BSB_DEBUG('s');
+ bsb.rx_timestamp = ms_ticks;
+ barrier();
+ bsb.tx_state = TX_STATE_SENDING;
+ barrier();
+ usart_enable_tx_interrupt(USART3);
+ return;
+ case TX_STATE_SENDING:
+ // In this state, we can race with the USART interrupt handler
+ cm_disable_interrupts();
+ if (bsb.tx_state == TX_STATE_SENDING && ms_ticks - bsb.rx_timestamp >= BSB_RX_TIMEOUT) {
+ // The echo of our packet was truncated due to collision
+ bsb.tx_state = TX_STATE_COLLISION;
+ BSB_DEBUG('t');
+ }
+ cm_enable_interrupts();
+ return;
+ case TX_STATE_COLLISION:
+ bsb_stats.tx_collisions++;
+ bsb_attempt_tx();
+ return;
+ case TX_STATE_SENT:
+ if (!bsb.reply_type_mask) {
+ // The frame needs no reply => confirm transmission
+ bsb_stats.tx_ok_no_reply++;
+ bsb.tx_state = TX_STATE_OFF;
+ bsb_tx_result = TX_RESULT_OK;
+ } else {
+ bsb.tx_state = TX_STATE_WAITING_FOR_REPLY;
+ bsb.tx_end_timestamp = ms_ticks;
+ BSB_DEBUG('w');
+ }
+ return;
+ case TX_STATE_WAITING_FOR_REPLY:
+ if (ms_ticks - bsb.tx_end_timestamp > BSB_REPLY_TIMEOUT) {
+ // We did not receive a reply. Maybe the request was lost? Re-transmit it.
+ bsb_stats.tx_reply_timeouts++;
+ BSB_DEBUG('t');
+ bsb_attempt_tx();
+ }
+ return;
+ default:
+ ;
+ }
+}
+
+static void bsb_attempt_tx(void)
+{
+ if (bsb.tx_attempts++ >= BSB_TX_MAX_ATTEMPTS) {
+ bsb.tx_state = TX_STATE_OFF;
+ bsb_tx_result = TX_RESULT_TOO_MANY_RETRIES;
+ return;
+ }
+
+ bsb.tx_ticks_to_send = (random_u32() | 0x80000000) >> (32 - BSB_TX_WAIT_LOG - (bsb.tx_attempts-1));
+
+ bsb.tx_state = TX_STATE_WAITING_FOR_IDLE_LINE;
+ bsb.tx_send_index = 0;
+ bsb.tx_check_index = 0;
+ debug_printf("TX: Attempt #%u, wait for %u ms\n", bsb.tx_attempts, (uint) bsb.tx_ticks_to_send);
+}
+
+static void bsb_send(byte *buf, uint len)
+{
+ // If a transmit is in progress, declare overrrun
+ if (bsb_tx_result != TX_RESULT_NONE) {
+ bsb_stats.tx_overruns++;
+ return;
+ }
+ if (bsb.tx_state != TX_STATE_OFF) {
+ bsb_stats.tx_overruns++;
+ bsb_tx_result = TX_RESULT_OVERRUN;
+ return;
+ }
+
+ // Check frame validity
+ if (len < 7 || len > BSB_MAX_SIZE || buf[BF_SOF] != 0xdc || buf[BF_LEN] != len) {
+ bsb_stats.tx_rejects++;
+ bsb_tx_result = TX_RESULT_MALFORMED;
+ return;
+ }
+
+ // Detect frame type and prepare expected reply types
+ if (buf[BF_OP] == BSB_OP_QUERY) {
+ // So far, we allow only QUERY frames
+ bsb.reply_type_mask = (1 << BSB_OP_ANSWER) | (1 << BSB_OP_ERROR);
+ } else {
+ bsb_stats.tx_rejects++;
+ bsb_tx_result = TX_RESULT_FORBIDDEN;
+ return;
+ }
+
+ // Fill in source address
+ buf[BF_SRC] = 0x80 + BSB_ADDR_GATEWAY;
+
+ // Calculate CRC
+ u16 crc = 0;
+ for (uint i = 0; i < len - 2; i++)
+ crc = bsb_crc_update(crc, buf[i]);
+ buf[len-2] = crc >> 8;
+ buf[len-1] = crc;
+ debug_printf("TX: Prepared frame: type=%02x dest=%02x len=%u crc=%04x reply=%08x\n", buf[BF_OP], buf[BF_DEST], len, crc, (uint) bsb.reply_type_mask);
+
+ // Queue frame for transmission
+ memcpy(bsb.tx_buf, buf, len);
+ bsb.tx_len = len;
+ bsb.tx_start_timestamp = ms_ticks;
+ bsb.tx_attempts = 0;
+ bsb_attempt_tx();
+
+ // Light the TX LED
+ gpio_clear(GPIOB, GPIO0);
+}
+
+static void bsb_check_reply(void)
+{
+ // Match received frame in bsb_rx_status_and_frame to expected replies
+ // and set the status in byte 0.
+
+ byte *frame = bsb_rx_status_and_frame + 1;
+ // XXX: This might be executed too fast, so we can still be in TX_STATE_SENT
+ if (bsb.tx_state == TX_STATE_WAITING_FOR_REPLY || bsb.tx_state == TX_STATE_SENT) {
+ if (frame[BF_DEST] == BSB_ADDR_GATEWAY &&
+ frame[BF_SRC] == bsb.tx_buf[BF_DEST] ^ 0x80 &&
+ frame[BF_OP] < 32 &&
+ bsb.reply_type_mask & (1 << frame[BF_OP])) {
+ debug_printf("BSB: Matched reply\n");
+ bsb.tx_state = TX_STATE_OFF;
+ bsb_stats.tx_ok_replied++;
+ bsb_rx_status_and_frame[0] = TX_RESULT_OK;
+ gpio_set(GPIOB, GPIO0); // Turn the TX LED off
+ return;
+ }
+ }
+
+ bsb_rx_status_and_frame[0] = TX_RESULT_NONE;
+}
+
+static void bsb_init(void)
+{
+ usart_set_baudrate(USART3, 4800);
+ usart_set_databits(USART3, 9);
+ usart_set_stopbits(USART3, USART_STOPBITS_1);
+ usart_set_mode(USART3, USART_MODE_TX_RX);
+ usart_set_parity(USART3, USART_PARITY_ODD);
+ usart_set_flow_control(USART3, USART_FLOWCONTROL_NONE);
+
+ usart_enable(USART3);
+ nvic_enable_irq(NVIC_USART3_IRQ);
+ usart_enable_rx_interrupt(USART3);
}
-static const struct usb_device_descriptor dev = {
+/*** USB ***/
+
+static usbd_device *usbd_dev;
+
+enum usb_string {
+ STR_MANUFACTURER = 1,
+ STR_PRODUCT,
+ STR_SERIAL,
+};
+
+static char usb_serial_number[13];
+
+static const char *usb_strings[] = {
+ "United Computer Wizards",
+ "BSB Gateway",
+ usb_serial_number,
+};
+
+static const struct usb_device_descriptor device = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = 0x0200,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.bMaxPacketSize0 = 64,
- .idVendor = 0x4242,
- .idProduct = 0x0003,
- .bcdDevice = 0x0200,
- .iManufacturer = 1,
- .iProduct = 2,
- .iSerialNumber = 3,
+ .idVendor = BSB_USB_VENDOR,
+ .idProduct = BSB_USB_PRODUCT,
+ .bcdDevice = BSB_USB_VERSION,
+ .iManufacturer = STR_MANUFACTURER,
+ .iProduct = STR_PRODUCT,
+ .iSerialNumber = STR_SERIAL,
.bNumConfigurations = 1,
};
static const struct usb_endpoint_descriptor endpoints[] = {{
+ // Bulk end-point for sending frames to BSB
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = 0x81,
+ .bEndpointAddress = 0x01,
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
.wMaxPacketSize = 64,
.bInterval = 1,
},{
+ // Interrupt end-point for receiving frames from BSB
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 0x82,
.endpoint = endpoints,
};
+static const struct usb_dfu_descriptor dfu_function = {
+ .bLength = sizeof(struct usb_dfu_descriptor),
+ .bDescriptorType = DFU_FUNCTIONAL,
+ .bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
+ .wDetachTimeout = 255,
+ .wTransferSize = 1024,
+ .bcdDFUVersion = 0x0100,
+};
+
+static const struct usb_interface_descriptor dfu_iface = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 1,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = 0xFE,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 1,
+ .iInterface = 0,
+
+ .extra = &dfu_function,
+ .extralen = sizeof(dfu_function),
+};
+
static const struct usb_interface ifaces[] = {{
.num_altsetting = 1,
.altsetting = &iface,
+}, {
+ .num_altsetting = 1,
+ .altsetting = &dfu_iface,
}};
static const struct usb_config_descriptor config = {
.bLength = USB_DT_CONFIGURATION_SIZE,
.bDescriptorType = USB_DT_CONFIGURATION,
.wTotalLength = 0,
- .bNumInterfaces = 1,
+ .bNumInterfaces = 2,
.bConfigurationValue = 1,
.iConfiguration = 0,
.bmAttributes = 0x80,
.interface = ifaces,
};
-static char usb_serial_number[13];
-
-static const char *usb_strings[] = {
- "United Computer Wizards",
- "BSB Gateway",
- usb_serial_number,
-};
-
static byte usb_configured;
+static byte usb_ep82_pending;
static uint8_t usbd_control_buffer[64];
-static enum usbd_request_return_codes control_cb(usbd_device *usbd_dev,
+static enum usbd_request_return_codes control_cb(
+ usbd_device *dev UNUSED,
struct usb_setup_data *req,
uint8_t **buf,
uint16_t *len,
- void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req) UNUSED)
+ void (**complete)(usbd_device *dev, struct usb_setup_data *req) UNUSED)
{
if (req->bmRequestType != 0xc0 || req->bRequest != 0x00)
return USBD_REQ_NOTSUPP;
- (void) usbd_dev;
- (void) buf;
- (void) len;
- (void) complete;
- debug_printf("USB: Control request\n");
+ // We support reading of statistics via control requests
+ debug_printf("USB: Reading statistics\n");
+ uint n = MIN(*len, sizeof(bsb_stats));
+ memcpy(*buf, (char *) &bsb_stats, n);
+ *len = n;
+
+ return USBD_REQ_HANDLED;
+}
- byte *b = *buf;
- b[0] = 0x12;
- b[1] = 0x34;
- b[2] = 0x56;
- b[3] = 0x78;
- if (*len > 4)
- *len = 4;
+static void dfu_detach_complete(usbd_device *dev UNUSED, struct usb_setup_data *req UNUSED)
+{
+ // Reset to bootloader, which implements the rest of DFU
+ debug_printf("Switching to DFU\n");
+ debug_flush();
+ scb_reset_core();
+}
+static enum usbd_request_return_codes dfu_control_cb(usbd_device *dev UNUSED,
+ struct usb_setup_data *req,
+ uint8_t **buf UNUSED,
+ uint16_t *len UNUSED,
+ void (**complete)(usbd_device *dev, struct usb_setup_data *req))
+{
+ if (req->bmRequestType != 0x21 || req->bRequest != DFU_DETACH)
+ return USBD_REQ_NOTSUPP;
+
+ *complete = dfu_detach_complete;
return USBD_REQ_HANDLED;
}
-static void ep81_cb(usbd_device *usbd_dev, uint8_t ep UNUSED)
+static void ep01_cb(usbd_device *dev, uint8_t ep UNUSED)
{
- byte buf[4];
- put_u32_be(buf, ms_ticks);
- usbd_ep_write_packet(usbd_dev, 0x81, buf, sizeof(buf));
- debug_printf("USB: Bulk write\n");
+ // We received a frame from the USB host
+ byte buf[64];
+ uint len = usbd_ep_read_packet(dev, 0x01, buf, sizeof(buf));
+ debug_printf("USB: Host sent %u bytes\n", len);
+ bsb_send(buf, len);
}
-static void set_config_cb(usbd_device *usbd_dev, uint16_t wValue UNUSED)
+static void ep82_cb(usbd_device *dev UNUSED, uint8_t ep UNUSED)
{
- usbd_register_control_callback(usbd_dev, USB_REQ_TYPE_VENDOR, USB_REQ_TYPE_TYPE, control_cb);
- usbd_ep_setup(usbd_dev, 0x81, USB_ENDPOINT_ATTR_BULK, 64, ep81_cb);
- usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
- ep81_cb(usbd_dev, 0);
+ // The frame was accepted by the USB host
+ debug_printf("USB: Interrupt done\n");
+ usb_ep82_pending = 0;
+}
+
+static void set_config_cb(usbd_device *dev, uint16_t wValue UNUSED)
+{
+ usbd_register_control_callback(
+ dev,
+ USB_REQ_TYPE_VENDOR,
+ USB_REQ_TYPE_TYPE,
+ control_cb);
+ usbd_register_control_callback(
+ dev,
+ USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+ USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+ dfu_control_cb);
+ usbd_ep_setup(dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, ep01_cb);
+ usbd_ep_setup(dev, 0x82, USB_ENDPOINT_ATTR_INTERRUPT, 64, ep82_cb);
usb_configured = 1;
}
{
debug_printf("USB: Reset\n");
usb_configured = 0;
+ usb_ep82_pending = 0;
+}
+
+static volatile bool usb_event_pending;
+
+void usb_lp_can_rx0_isr(void)
+{
+ /*
+ * We handle USB in the main loop to avoid race conditions between
+ * USB interrupts and other code. However, we need an interrupt to
+ * up the main loop from sleep.
+ *
+ * We set up only the low-priority ISR, because high-priority ISR handles
+ * only double-buffered bulk transfers and isochronous transfers.
+ */
+ nvic_disable_irq(NVIC_USB_LP_CAN_RX0_IRQ);
+ usb_event_pending = 1;
+}
+
+static void usb_init(void)
+{
+ // Simulate USB disconnect
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO11 | GPIO12);
+ gpio_clear(GPIOA, GPIO11 | GPIO12);
+ delay_ms(100);
+
+ usbd_dev = usbd_init(
+ &st_usbfs_v1_usb_driver,
+ &device,
+ &config,
+ usb_strings,
+ ARRAY_SIZE(usb_strings),
+ usbd_control_buffer,
+ sizeof(usbd_control_buffer)
+ );
+ usbd_register_reset_callback(usbd_dev, reset_cb);
+ usbd_register_set_config_callback(usbd_dev, set_config_cb);
+ usb_event_pending = 1;
}
+/*** Main ***/
+
int main(void)
{
clock_init();
tick_init();
usart_init();
desig_get_unique_id_as_dfu(usb_serial_number);
+ random_init();
- debug_printf("Hello, kitty!\n");
+ debug_printf("Hail, Lord Damian! Thy BSB interface is ready.\n");
- // Simulate USB disconnect
- gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO11 | GPIO12);
- gpio_clear(GPIOA, GPIO11 | GPIO12);
- delay_ms(1000);
+ bsb_init();
+ usb_init();
- usbd_device *usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config, usb_strings, ARRAY_SIZE(usb_strings), usbd_control_buffer, sizeof(usbd_control_buffer));
- usbd_register_reset_callback(usbd_dev, reset_cb);
- usbd_register_set_config_callback(usbd_dev, set_config_cb);
- u32 last_ds_step = 0;
+ u32 last_blink = 0;
+ u32 last_step = 0;
for (;;) {
- if (ms_ticks - last_ds_step >= 100) {
+ if (ms_ticks - last_blink >= 100) {
debug_led_toggle();
- last_ds_step = ms_ticks;
- if (usb_configured) {
- byte x[4];
- put_u32_be(x, ms_ticks);
- usbd_ep_write_packet(usbd_dev, 0x82, x, 4);
+ last_blink = ms_ticks;
+ }
+
+ if (usb_event_pending) {
+ usbd_poll(usbd_dev);
+ usb_event_pending = 0;
+ nvic_clear_pending_irq(NVIC_USB_LP_CAN_RX0_IRQ);
+ nvic_enable_irq(NVIC_USB_LP_CAN_RX0_IRQ);
+ }
+
+ if (usb_configured) {
+ // Passing of received frames to USB
+ if (!usb_ep82_pending) {
+ if (bsb_rx_frame_len) {
+ // Received frame, possibly marked as reply
+ barrier();
+ bsb_check_reply();
+ usbd_ep_write_packet(usbd_dev, 0x82, bsb_rx_status_and_frame, 1 + bsb_rx_frame_len);
+ usb_ep82_pending = 1;
+ barrier();
+ bsb_rx_frame_len = 0;
+ debug_printf("USB: Sending frame to interrupt EP\n");
+ } else if (bsb_tx_result != TX_RESULT_NONE) {
+ // Only a transmission result
+ usbd_ep_write_packet(usbd_dev, 0x82, &bsb_tx_result, 1);
+ usb_ep82_pending = 1;
+ gpio_set(GPIOB, GPIO0); // Turn the TX LED off
+ debug_printf("USB: Sending status %u to interrupt EP\n", bsb_tx_result);
+ bsb_tx_result = TX_RESULT_NONE;
+ }
}
}
- // XXX: libopencm3 usbd does not use interrupts at the moment, need to poll...
- // wait_for_interrupt();
- usbd_poll(usbd_dev);
+ if (ms_ticks != last_step) {
+ last_step = ms_ticks;
+ bsb_rx_step();
+ bsb_tx_step();
+ }
+
+ wait_for_interrupt();
}
return 0;
projects / home-hw.git / blobdiff