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#include "project.h"
#define BUFFER_SIZE 512
ring_t cdcacm_rx_ring;
static uint8_t cdcacm_rx_ring_buf[BUFFER_SIZE];
ring_t cdcacm_tx_ring;
static uint8_t cdcacm_tx_ring_buf[BUFFER_SIZE];
static int cdcacm_ready = 0;
#define COMM_EP 0x83
#define DATA_IN 0x01
#define DATA_OUT 0x82
static const struct usb_endpoint_descriptor comm_endp[] = {
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = COMM_EP,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 16,
.bInterval = 255,
}
};
static const struct usb_endpoint_descriptor data_endp[] = {
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = DATA_IN,
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
.wMaxPacketSize = 64,
.bInterval = 1,
},
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = DATA_OUT,
.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 = 3,
},
.acm = {
.bFunctionLength = sizeof (struct usb_cdc_acm_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_ACM,
.bmCapabilities = 0,
},
.cdc_union = {
.bFunctionLength = sizeof (struct usb_cdc_union_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_UNION,
.bControlInterface = 2,
.bSubordinateInterface0 = 3,
}
};
const struct usb_interface_descriptor comm_iface = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 2,
.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)
};
const struct usb_interface_descriptor data_iface = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 3,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = 0,
.endpoint = data_endp,
};
const struct usb_iface_assoc_descriptor cdc_iface_assoc = {
.bLength = USB_DT_INTERFACE_ASSOCIATION_SIZE,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
.bFirstInterface = 2,
.bInterfaceCount = 2,
.bFunctionClass = USB_CLASS_CDC,
.bFunctionSubClass = USB_CDC_SUBCLASS_ACM,
.bFunctionProtocol = USB_CDC_PROTOCOL_AT,
.iFunction = 6,
};
enum usbd_request_return_codes
cdcacm_control_request (usbd_device *usbd_dev,
struct usb_setup_data *req,
uint8_t **buf,
uint16_t *len,
usbd_control_complete_callback *complete) {
(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.
*/
return USBD_REQ_HANDLED;
}
case USB_CDC_REQ_SET_LINE_CODING:
if (*len < sizeof (struct usb_cdc_line_coding))
return USBD_REQ_NOTSUPP;
return USBD_REQ_HANDLED;
}
return USBD_REQ_NEXT_CALLBACK;
}
void cdcacm_tick (void)
{
unsigned ep = DATA_OUT;
uint8_t buf[16];
uint8_t *ptr = buf;
size_t n = 0;
if (!cdcacm_ready)
return;
if (ring_empty (&cdcacm_tx_ring))
return;
/* Return if endpoint is already enabled. */
if ((*USB_EP_REG (ep & 0x7f) & USB_EP_TX_STAT) == USB_EP_TX_STAT_VALID)
return;
while (!ring_read_byte (&cdcacm_tx_ring, ptr++)) {
n++;
if (n == sizeof (buf)) break;
}
usbd_ep_write_packet (usb_device, ep, buf, n);
}
int cdcacm_write (char *ptr, int len)
{
int ret;
ret = ring_write (&cdcacm_tx_ring, (uint8_t *) ptr, len);
return ret;
}
static void cdcacm_data_rx_cb (usbd_device *usbd_dev, uint8_t ep)
{
(void) ep;
uint8_t buf[64];
int len = usbd_ep_read_packet (usbd_dev, DATA_IN, buf, 64);
if (len)
ring_write (&cdcacm_rx_ring, buf, len);
}
void cdcacm_set_config (usbd_device *usbd_dev, uint16_t wValue)
{
(void) wValue;
usbd_ep_setup (usbd_dev, DATA_IN, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb);
usbd_ep_setup (usbd_dev, DATA_OUT, USB_ENDPOINT_ATTR_BULK, 64, NULL);
usbd_ep_setup (usbd_dev, COMM_EP, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
cdcacm_ready = 1;
}
void cdcacm_rings_init (void)
{
ring_init (&cdcacm_rx_ring, cdcacm_rx_ring_buf, sizeof (cdcacm_rx_ring_buf));
ring_init (&cdcacm_tx_ring, cdcacm_tx_ring_buf, sizeof (cdcacm_tx_ring_buf));
}
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