/*---------------------------------------------------------------------------*/
PROCESS_THREAD(cc1101_process, ev, data)
{
PROCESS_POLLHANDLER(pollhandler());
PROCESS_BEGIN();
#if 0
while(1) {
static struct etimer et;
uint8_t rxbytes, txbytes;
etimer_set(&et, CLOCK_SECOND * 4);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
// cc1101_rx_interrupt();
burst_read(CC1101_RXBYTES, &rxbytes, 1);
burst_read(CC1101_TXBYTES, &txbytes, 1);
printf("state 0x%02x rxbytes 0x%02x txbytes 0x%02x\n",
state(), rxbytes, txbytes);
on();
}
#endif /* 0 */
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_EXIT);
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static uint8_t
read_rxbytes(void)
{
uint8_t rxbytes1, rxbytes2;
do {
burst_read(CC1101_RXBYTES, &rxbytes1, 1);
burst_read(CC1101_RXBYTES, &rxbytes2, 1);
if(rxbytes1 + 1 == rxbytes2 || rxbytes1 + 2 == rxbytes2) {
/* XXX Workaround for slow CPU/SPI */
return rxbytes2;
}
} while(rxbytes1 != rxbytes2);
return rxbytes1;
}
/*---------------------------------------------------------------------------*/
static uint8_t
txbytes(void)
{
uint8_t txbytes1, txbytes2;
do {
burst_read(CC1101_TXBYTES, &txbytes1, 1);
burst_read(CC1101_TXBYTES, &txbytes2, 1);
if(txbytes1 - 1 == txbytes2 || txbytes1 - 2 == txbytes2) {
/* XXX Workaround for slow CPU/SPI */
return txbytes2;
}
} while(txbytes1 != txbytes2);
return txbytes2;
}
/**
* The CC1101 interrupt handler: called by the hardware interrupt
* handler, which is defined as part of the cc1101-arch interface.
*/
int
cc1101_rx_interrupt(void)
{
/* NB: This function may be called both from an rx interrupt and
from cc1101_process */
uint8_t rxbytes, s;
if(radio_on_or_off == OFF) {
return 0;
}
#if DEBUG
printf("-");
#endif /* DEBUG */
if(SPI_IS_LOCKED()) {
#if DEBUG
printf("/%d", spi_locked);
#endif /* DEBUG */
process_poll(&cc1101_process);
return 1;
}
LOCK_SPI();
s = state();
if(s == CC1101_STATE_RXFIFO_OVERFLOW) {
burst_read(CC1101_RXBYTES, &rxbytes, 1);
#if DEBUG
printf("irqflush\n");
printf("rxbytes 0x%02x\n", rxbytes);
#endif /* DEBUG */
flushrx();
RELEASE_SPI();
return 0;
}
if(s == CC1101_STATE_TXFIFO_UNDERFLOW) {
#if DEBUG
printf("irqflushtx\n");
#endif /* DEBUG */
strobe(CC1101_SFTX);
strobe(CC1101_SRX);
RELEASE_SPI();
return 0;
}
if(is_receiving() && timer_expired(&rxstate.timer)) {
#if DEBUG
printf("Packet expired, flushing fifo\n");
#endif /* DEBUG */
flushrx();
RELEASE_SPI();
return 0;
}
#define RX_OVERFLOW 0x80
/* Read each byte from the RXFIFO and put it into the input_byte()
function, which takes care of the reception logic. */
do {
uint8_t byte;
int i, numbytes;
rxbytes = read_rxbytes();
if(rxbytes & RX_OVERFLOW) {
#if DEBUG
printf("ovf\n");
leds_off(LEDS_GREEN;)
#endif /* DEBUG */
flushrx();
process_poll(&cc1101_process);
RELEASE_SPI();
return 1;
}
static int ec_command_lpc_3(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
struct ec_host_request rq;
struct ec_host_response rs;
const uint8_t *d;
int csum = 0;
int i;
/* Fail if output size is too big */
if (outsize + sizeof(rq) > EC_LPC_HOST_PACKET_SIZE)
return -EC_RES_REQUEST_TRUNCATED;
/* Fill in request packet */
/* TODO(crosbug.com/p/23825): This should be common to all protocols */
rq.struct_version = EC_HOST_REQUEST_VERSION;
rq.checksum = 0;
rq.command = command;
rq.command_version = version;
rq.reserved = 0;
rq.data_len = outsize;
/* Copy data and start checksum */
burst_write((const uint8_t *)outdata, &csum,
EC_LPC_ADDR_HOST_PACKET + sizeof(rq), outsize);
/* Finish checksum */
for (i = 0, d = (const uint8_t *)&rq; i < sizeof(rq); i++, d++)
csum += *d;
/* Write checksum field so the entire packet sums to 0 */
rq.checksum = (uint8_t)(-csum);
/* Copy header */
burst_write((const uint8_t *)&rq, NULL,
EC_LPC_ADDR_HOST_PACKET, sizeof(rq));
/* Start the command */
send_byte(EC_COMMAND_PROTOCOL_3, EC_LPC_ADDR_HOST_CMD);
if (wait_for_ec(EC_LPC_ADDR_HOST_CMD, 1000000)) {
fprintf(stderr, "Timeout waiting for EC response\n");
return -EC_RES_ERROR;
}
/* Check result */
i = read_byte(EC_LPC_ADDR_HOST_DATA);
if (i) {
fprintf(stderr, "EC returned error result code %d\n", i);
return -EECRESULT - i;
}
/* Read back response header and start checksum */
csum = 0;
burst_read((uint8_t *)&rs, &csum, EC_LPC_ADDR_HOST_PACKET, sizeof(rs));
if (rs.struct_version != EC_HOST_RESPONSE_VERSION) {
fprintf(stderr, "EC response version mismatch\n");
return -EC_RES_INVALID_RESPONSE;
}
if (rs.reserved) {
fprintf(stderr, "EC response reserved != 0\n");
return -EC_RES_INVALID_RESPONSE;
}
if (rs.data_len > insize) {
fprintf(stderr, "EC returned too much data\n");
return -EC_RES_RESPONSE_TOO_BIG;
}
/* Read back data and update checksum */
burst_read((uint8_t *)indata, &csum,
EC_LPC_ADDR_HOST_PACKET + sizeof(rs), rs.data_len);
/* Verify checksum */
if ((uint8_t)csum) {
fprintf(stderr, "EC response has invalid checksum\n");
return -EC_RES_INVALID_CHECKSUM;
}
/* Return actual amount of data received */
return rs.data_len;
}
static int ec_command_lpc(int command, int version,
const void *outdata, int outsize,
void *indata, int insize)
{
struct ec_lpc_host_args args;
int csum;
int i;
/* Fill in args */
args.flags = EC_HOST_ARGS_FLAG_FROM_HOST;
args.command_version = version;
args.data_size = outsize;
/* Initialize checksum */
csum = command + args.flags + args.command_version + args.data_size;
/* Write data and update checksum */
burst_write((uint8_t *)outdata, &csum, EC_LPC_ADDR_HOST_PARAM, outsize);
/* Finalize checksum and write args */
args.checksum = (uint8_t)csum;
burst_write((const uint8_t *)&args, NULL,
EC_LPC_ADDR_HOST_ARGS, sizeof(args));
send_byte(command, EC_LPC_ADDR_HOST_CMD);
if (wait_for_ec(EC_LPC_ADDR_HOST_CMD, 1000000)) {
fprintf(stderr, "Timeout waiting for EC response\n");
return -EC_RES_ERROR;
}
/* Check result */
i = read_byte(EC_LPC_ADDR_HOST_DATA);
if (i) {
fprintf(stderr, "EC returned error result code %d\n", i);
return -EECRESULT - i;
}
/* Read back args */
burst_read((uint8_t *)&args, NULL, EC_LPC_ADDR_HOST_ARGS, sizeof(args));
/*
* If EC didn't modify args flags, then somehow we sent a new-style
* command to an old EC, which means it would have read its params
* from the wrong place.
*/
if (!(args.flags & EC_HOST_ARGS_FLAG_TO_HOST)) {
fprintf(stderr, "EC protocol mismatch\n");
return -EC_RES_INVALID_RESPONSE;
}
if (args.data_size > insize) {
fprintf(stderr, "EC returned too much data\n");
return -EC_RES_INVALID_RESPONSE;
}
/* Start calculating response checksum */
csum = command + args.flags + args.command_version + args.data_size;
/* Read response and update checksum */
burst_read((uint8_t *)indata, &csum,
EC_LPC_ADDR_HOST_PARAM, args.data_size);
/* Verify checksum */
if (args.checksum != (uint8_t)csum) {
fprintf(stderr, "EC response has invalid checksum\n");
return -EC_RES_INVALID_CHECKSUM;
}
/* Return actual amount of data received */
return args.data_size;
}
