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/**************************************************************************
* spi. - SPI functions to connect an Arduidno to the TI CC3000
*
* This code uses the Arduino hardware SPI library (or a bit-banged
* SPI for the Teensy 3.0) to send & receive data between the library
* API calls and the CC3000 hardware. Every
*
* Version 1.0.1b
*
* Copyright (C) 2013 Chris Magagna - cmagagna@yahoo.com
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Don't sue me if my code blows up your board and burns down your house
*
****************************************************************************/
/*****************************************************************************
* Included Files
*****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <pthread.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <debug.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "spi.h"
#include <nuttx/wireless/cc3000.h>
#include <nuttx/wireless/cc3000/cc3000_common.h>
/*****************************************************************************
* Pre-processor Definitions
*****************************************************************************/
#undef SPI_DEBUG /* Define to enable debug */
#undef SPI_VERBOSE /* Define to enable verbose debug */
#ifdef SPI_DEBUG
# define spidbg lldbg
# ifdef SPI_VERBOSE
# define spivdbg lldbg
# else
# define spivdbg(x...)
# endif
#else
# undef SPI_VERBOSE
# define spidbg(x...)
# define spivdbg(x...)
#endif
static struct
{
int cc3000fd;
gcSpiHandleRx pfRxHandler;
pthread_t unsoliced_thread;
bool run;
uint8_t rx_buffer[CC3000_RX_BUFFER_SIZE];
} spiconf;
/*****************************************************************************
* Public Functions
*****************************************************************************/
/*****************************************************************************
* Name: SpiResumeSpi
*
* Description:
* Will re enable the SPI_IRQ'a ability to create interrupts. It is used to
* resume processing after the code passed to SpiOpen is Called
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
*****************************************************************************/
void SpiResumeSpi(void)
{
DEBUGASSERT(spiconf.cc3000fd);
if (ioctl(spiconf.cc3000fd,CC3000IOC_COMPLETE,0))
{
printf("ioctl:CC3000IOC_COMPLETE failed: %s\n", strerror(errno));
}
}
/*****************************************************************************
* Name: SpiWrite
*
* Description:
* This function enter point for write flow
*
* Input Parameters:
* pUserBuffer
* usLength
*
* Returned Value:
*
*****************************************************************************/
long SpiWrite(uint8_t *pUserBuffer, uint16_t usLength)
{
DEBUGASSERT(spiconf.cc3000fd);
return write(spiconf.cc3000fd,pUserBuffer,usLength) == usLength ? 0 : -errno;
}
/*****************************************************************************
* Name: SpiRead
*
* Description:
* This function enter point for read flow. This function will block the
* caller untinlthere is data Available
*
* Input Parameters:
* pUserBuffer
* usLength
*
* Returned Value:
*
*****************************************************************************/
long SpiRead(uint8_t *pUserBuffer, uint16_t usLength)
{
DEBUGASSERT(spiconf.cc3000fd);
return read(spiconf.cc3000fd,pUserBuffer,usLength);
}
/*****************************************************************************
* Name: unsoliced_thread_func
*
* Description:
* This is the thread for unsolicited events. This function will block the
* caller untinlthere is data Available
*
* Input Parameters:
* parameter
*
* Returned Value:
*
*****************************************************************************/
static void *unsoliced_thread_func(void *parameter)
{
char queuename[QUEUE_NAMELEN];
int status = 0;
int nbytes = 0;
int minor = 0;
ioctl(spiconf.cc3000fd, CC3000IOC_GETQUEID, (unsigned long)&minor);
snprintf(queuename, QUEUE_NAMELEN, QUEUE_FORMAT, minor);
mqd_t queue = mq_open(queuename,O_RDONLY);
while(spiconf.run)
{
memset(spiconf.rx_buffer,0,sizeof(spiconf.rx_buffer));
nbytes = mq_receive(queue, spiconf.rx_buffer, CC3000_RX_BUFFER_SIZE, 0);
if (nbytes > 0)
{
spiconf.pfRxHandler(spiconf.rx_buffer);
}
}
mq_close(queue);
pthread_exit((pthread_addr_t)status);
return (pthread_addr_t)status;
}
/*****************************************************************************
* Name: SpiOpen
*
* Description:
* Configure the SPI
*
* Input Parameters:
* pfRxHandler the Rx handler for SPI
*
* Returned Value:
* None
*
*****************************************************************************/
void SpiOpen(gcSpiHandleRx pfRxHandler)
{
int status;
DEBUGASSERT(spiconf.cc3000fd == 0);
int fd = open("/dev/wireless0",O_RDWR|O_BINARY);
if (fd > 0)
{
spiconf.pfRxHandler = pfRxHandler;
spiconf.cc3000fd = fd;
spiconf.run = true;
status = pthread_create(&spiconf.unsoliced_thread,NULL,
unsoliced_thread_func, NULL);
DEBUGASSERT(status == 0)
}
}
/*****************************************************************************
* Name: SpiClose
*
* Description:
* Configure the SPI
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
*****************************************************************************/
void SpiClose(void)
{
if (spiconf.cc3000fd)
{
int status;
spiconf.run = false;
pthread_cancel(spiconf.unsoliced_thread);
pthread_join(spiconf.unsoliced_thread, (pthread_addr_t*)&status);
close(spiconf.cc3000fd);
spiconf.cc3000fd = 0;
}
}
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