contiki/cpu/avr/dev/usb/rndis/cdc_eem.c

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#include "cdc_eem.h"
#include "contiki.h"
#include "usb_drv.h"
#include "usb_descriptors.h"
#include "usb_specific_request.h"
#include "rndis/rndis_task.h"
#include "rndis/rndis_protocol.h"
#include "uip.h"
#include "sicslow_ethernet.h"
#include <stdio.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#define BUF ((struct uip_eth_hdr *)&uip_buf[0])
#define PRINTF printf
#define PRINTF_P printf_P
extern uint8_t usb_eth_data_buffer[64];
//_____ M A C R O S ________________________________________________________
#define EEMCMD_ECHO 0x00 ///bmEEMCmd Echo
#define EEMCMD_ECHO_RESPONSE 0x01 ///bmEEMCmd Echo Response
#define EEMCMD_SUSPEND_HINT 0x02 ///bmEEMCmd Suspend Hint
#define EEMCMD_RESPONSE_HINT 0x03 ///bmEEMCmd Response Hint
#define EEMCMD_RESPONSE_COMPLETE_HINT 0x04 ///bmEEMCmd Response Complete Hint
#define EEMCMD_TICKLE 0x05 ///bmEEMCmd Tickle
void cdc_eem_configure_endpoints() {
usb_configure_endpoint(TX_EP, \
TYPE_BULK, \
DIRECTION_IN, \
SIZE_64, \
TWO_BANKS, \
NYET_ENABLED);
usb_configure_endpoint(RX_EP, \
TYPE_BULK, \
DIRECTION_OUT, \
SIZE_64, \
TWO_BANKS, \
NYET_ENABLED);
Usb_reset_endpoint(TX_EP);
Usb_reset_endpoint(RX_EP);
}
void cdc_eem_process(void) {
uint16_t datalength;
uint8_t bytecounter, headercounter;
uint16_t i;
#ifdef USB_ETH_HOOK_INIT
static uint8_t doInit = 1;
if (doInit) {
USB_ETH_HOOK_INIT();
doInit = 0;
}
#endif
//Connected!
Led0_on();
Usb_select_endpoint(RX_EP);
//If we have data and a free buffer
if(Is_usb_receive_out() && (uip_len == 0)) {
//Read how much (endpoint only stores up to 64 bytes anyway)
bytecounter = Usb_byte_counter_8();
//EEM uses 2 bytes as a header
headercounter = 2;
uint8_t fail = 0;
//Hmm.. what's going on here?
if (bytecounter < headercounter) {
Usb_ack_receive_out();
//TODO CO done = 1;
}
//Read EEM Header
i = 0;
while (headercounter) {
usb_eth_data_buffer[i] = Usb_read_byte();
bytecounter--;
headercounter--;
i++;
}
//Order is LSB/MSB, so MSN is in usb_eth_data_buffer[1]
//Bit 15 indicates command packet when set
if (usb_eth_data_buffer[1] & 0x80) {
//not a data payload
datalength = 0;
} else {
//'0' indicates data packet
//Length is lower 14 bits
datalength = usb_eth_data_buffer[0] | ((usb_eth_data_buffer[1] & 0x3F) << 8);
}
/* EEM Command Packet */
if ((datalength == 0) && (fail == 0))
{
uint8_t command;
uint16_t echoLength;
//Strip command off
command = usb_eth_data_buffer[1] & 0x38;
command = command >> 3;
//Decode command type
switch (command)
{
/* Echo Request */
case EEMCMD_ECHO:
//Get echo length
echoLength = (usb_eth_data_buffer[1] & 0x07) << 8; //MSB
echoLength |= usb_eth_data_buffer[0]; //LSB
//TODO: everything. oops.
break;
/* Everything else: Whatever. */
case EEMCMD_ECHO_RESPONSE:
case EEMCMD_SUSPEND_HINT:
case EEMCMD_RESPONSE_HINT:
case EEMCMD_RESPONSE_COMPLETE_HINT:
case EEMCMD_TICKLE:
break;
default: break;
}
}
/* EEM Data Packet */
else if (datalength && (fail == 0))
{
//Looks like we've got a live one
#ifdef USB_ETH_HOOK_RX_START
USB_ETH_HOOK_RX_START();
#endif
uint16_t bytes_received = 0;
uint16_t dataleft = datalength;
U8 * buffer = uip_buf;
while(dataleft)
{
*buffer++ = Usb_read_byte();
dataleft--;
bytecounter--;
bytes_received++;
//Check if endpoint is done but we are expecting more data
if ((bytecounter == 0) && (dataleft))
{
//ACK previous data
Usb_ack_receive_out();
//Wait for new data
while (!Is_usb_receive_out());
//Get new data
bytecounter = Usb_byte_counter_8();
//ZLP?
if (bytecounter == 0)
{
//Incomplete!!
break;
}
}
}
//Ack final data packet
Usb_ack_receive_out();
#ifdef USB_ETH_HOOK_RX_END
USB_ETH_HOOK_RX_END();
#endif
//Packet has CRC, nobody wants that garbage
datalength -= 4;
//Send data over RF or to local stack
if(datalength <= USB_ETH_MTU) {
USB_ETH_HOOK_HANDLE_INBOUND_PACKET(uip_buf,datalength);
} else {
USB_ETH_HOOK_RX_ERROR("Oversized packet");
}
} //if (datalength)
} //if(Is_usb_receive_out() && (uip_len == 0))
}
/**
\brief Send a single ethernet frame using EEM
*/
uint8_t eem_send(uint8_t * senddata, uint16_t sendlen, uint8_t led)
{
//Make a header
uint8_t header[2];
//Fake CRC! Add 4 to length for CRC
sendlen += 4;
header[0] = (sendlen >> 8) & 0x3f;
header[1] = sendlen & 0xff;
//We send CRC seperatly..
sendlen -= 4;
//Send Data
Usb_select_endpoint(TX_EP);
//Usb_send_in();
//Wait for ready
if(usb_endpoint_wait_for_write_enabled()!=0) {
USB_ETH_HOOK_TX_ERROR("Timeout: write enabled");
return 0;
}
#ifdef USB_ETH_HOOK_TX_START
USB_ETH_HOOK_TX_START();
#endif
//Send header (LSB then MSB)
Usb_write_byte(header[1]);
Usb_write_byte(header[0]);
//Send packet
while(sendlen) {
Usb_write_byte(*senddata);
senddata++;
sendlen--;
//If endpoint is full, send data in
//And then wait for data to transfer
if (!Is_usb_write_enabled()) {
Usb_send_in();
if(usb_endpoint_wait_for_write_enabled()!=0) {
USB_ETH_HOOK_TX_ERROR("Timeout: write enabled");
return 0;
}
}
}
//CRC = 0xdeadbeef
//Linux kernel 2.6.31 needs 0xdeadbeef in wrong order,
//like this: uint8_t crc[4] = {0xef, 0xbe, 0xad, 0xde};
//This is fixed in 2.6.32 to the correct order (0xde, 0xad, 0xbe, 0xef)
uint8_t crc[4] = {0xde, 0xad, 0xbe, 0xef};
sendlen = 4;
uint8_t i = 0;
//Send fake CRC
while(sendlen) {
Usb_write_byte(crc[i]);
i++;
sendlen--;
//If endpoint is full, send data in
//And then wait for data to transfer
if (!Is_usb_write_enabled()) {
Usb_send_in();
if(usb_endpoint_wait_for_write_enabled()!=0) {
USB_ETH_HOOK_TX_ERROR("Timeout: write enabled");
return 0;
}
}
}
//Send last data in - also handles sending a ZLP if needed
Usb_send_in();
#ifdef USB_ETH_HOOK_TX_END
USB_ETH_HOOK_TX_END();
#endif
//Wait for ready
if(usb_endpoint_wait_for_IN_ready()!=0) {
USB_ETH_HOOK_TX_ERROR("Timeout: IN ready");
return 0;
}
return 1;
}