micropython/cc3200/simplelink/cc_pal.c

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//*****************************************************************************
// cc_pal.c
//
// simplelink abstraction file for CC3200
//
// Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
//
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// Neither the name of Texas Instruments Incorporated nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//*****************************************************************************
//Simplelink includes
#include <simplelink.h>
#include <cc_pal.h>
//Driverlib includes
#include <hw_ints.h>
#include <hw_types.h>
#include <pin.h>
#include <hw_memmap.h>
#include <hw_mcspi.h>
#include <hw_common_reg.h>
#include <rom.h>
#include <rom_map.h>
#include <spi.h>
#include <prcm.h>
#include <rom.h>
#include <rom_map.h>
#include <hw_ints.h>
#include <interrupt.h>
#include <utils.h>
#define REG_INT_MASK_SET 0x400F7088
#define REG_INT_MASK_CLR 0x400F708C
#define APPS_SOFT_RESET_REG 0x4402D000
#define OCP_SHARED_MAC_RESET_REG 0x4402E168
#define SPI_RATE_20M 20000000
#define UNUSED(x) (x = x)
//
// GLOBAL VARIABLES -- Start
//
volatile Fd_t g_SpiFd =0;
P_EVENT_HANDLER g_pHostIntHdl = NULL;
//
// GLOBAL VARIABLES -- End
//
//****************************************************************************
// LOCAL FUNCTION PROTOTYPES
//****************************************************************************
static int spi_Read_CPU(unsigned char *pBuff, int len);
static int spi_Write_CPU(unsigned char *pBuff, int len);
//****************************************************************************
// LOCAL FUNCTION DEFINITIONS
//****************************************************************************
/*!
\brief attempts to read up to len bytes from SPI channel into a buffer starting at pBuff.
\param pBuff - points to first location to start writing the data
\param len - number of bytes to read from the SPI channel
\return upon successful completion, the function shall return Read Size.
Otherwise, -1 shall be returned
\sa spi_Read_CPU , spi_Write_CPU
\note
\warning
*/
int spi_Read_CPU(unsigned char *pBuff, int len)
{
unsigned long ulCnt;
unsigned long ulStatusReg;
unsigned long *ulDataIn;
unsigned long ulTxReg;
unsigned long ulRxReg;
MAP_SPICSEnable(LSPI_BASE);
//
// Initialize local variable.
//
ulDataIn = (unsigned long *)pBuff;
ulCnt = (len + 3) >> 2;
ulStatusReg = LSPI_BASE+MCSPI_O_CH0STAT;
ulTxReg = LSPI_BASE + MCSPI_O_TX0;
ulRxReg = LSPI_BASE + MCSPI_O_RX0;
//
// Reading loop
//
while(ulCnt--)
{
while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_TXS ));
HWREG(ulTxReg) = 0xFFFFFFFF;
while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_RXS ));
*ulDataIn = HWREG(ulRxReg);
ulDataIn++;
}
MAP_SPICSDisable(LSPI_BASE);
return len;
}
/*!
\brief attempts to write up to len bytes to the SPI channel
\param pBuff - points to first location to start getting the data from
\param len - number of bytes to write to the SPI channel
\return upon successful completion, the function shall return write size.
Otherwise, -1 shall be returned
\sa spi_Read_CPU , spi_Write_CPU
\note This function could be implemented as zero copy and return only upon successful completion
of writing the whole buffer, but in cases that memory allocation is not too tight, the
function could copy the data to internal buffer, return back and complete the write in
parallel to other activities as long as the other SPI activities would be blocked untill
the entire buffer write would be completed
\warning
*/
int spi_Write_CPU(unsigned char *pBuff, int len)
{
unsigned long ulCnt;
unsigned long ulStatusReg;
unsigned long *ulDataOut;
unsigned long ulDataIn;
unsigned long ulTxReg;
unsigned long ulRxReg;
MAP_SPICSEnable(LSPI_BASE);
//
// Initialize local variable.
//
ulDataOut = (unsigned long *)pBuff;
ulCnt = (len +3 ) >> 2;
ulStatusReg = LSPI_BASE+MCSPI_O_CH0STAT;
ulTxReg = LSPI_BASE + MCSPI_O_TX0;
ulRxReg = LSPI_BASE + MCSPI_O_RX0;
//
// Writing Loop
//
while(ulCnt--)
{
while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_TXS ));
HWREG(ulTxReg) = *ulDataOut;
while(!( HWREG(ulStatusReg)& MCSPI_CH0STAT_RXS ));
ulDataIn = HWREG(ulRxReg);
ulDataOut++;
}
MAP_SPICSDisable(LSPI_BASE);
UNUSED(ulDataIn);
return len;
}
/*!
\brief open spi communication port to be used for communicating with a SimpleLink device
Given an interface name and option flags, this function opens the spi communication port
and creates a file descriptor. This file descriptor can be used afterwards to read and
write data from and to this specific spi channel.
The SPI speed, clock polarity, clock phase, chip select and all other attributes are all
set to hardcoded values in this function.
\param ifName - points to the interface name/path. The interface name is an
optional attributes that the simple link driver receives
on opening the device. in systems that the spi channel is
not implemented as part of the os device drivers, this
parameter could be NULL.
\param flags - option flags
\return upon successful completion, the function shall open the spi channel and return
a non-negative integer representing the file descriptor.
Otherwise, -1 shall be returned
\sa spi_Close , spi_Read , spi_Write
\note
\warning
*/
Fd_t spi_Open(char *ifName, unsigned long flags)
{
unsigned long ulBase;
unsigned long ulSpiBitRate = SPI_RATE_20M;
//NWP master interface
ulBase = LSPI_BASE;
//Enable MCSPIA2
MAP_PRCMPeripheralClkEnable(PRCM_LSPI,PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK);
//Disable Chip Select
MAP_SPICSDisable(ulBase);
//Disable SPI Channel
MAP_SPIDisable(ulBase);
// Reset SPI
MAP_SPIReset(ulBase);
//
// Configure SPI interface
//
MAP_SPIConfigSetExpClk(ulBase,MAP_PRCMPeripheralClockGet(PRCM_LSPI),
ulSpiBitRate,SPI_MODE_MASTER,SPI_SUB_MODE_0,
(SPI_SW_CTRL_CS |
SPI_4PIN_MODE |
SPI_TURBO_OFF |
SPI_CS_ACTIVEHIGH |
SPI_WL_32));
MAP_SPIEnable(ulBase);
g_SpiFd = 1;
return g_SpiFd;
}
/*!
\brief closes an opened spi communication port
\param fd - file descriptor of an opened SPI channel
\return upon successful completion, the function shall return 0.
Otherwise, -1 shall be returned
\sa spi_Open
\note
\warning
*/
int spi_Close(Fd_t fd)
{
unsigned long ulBase = LSPI_BASE;
g_SpiFd = 0;
//Disable Chip Select
MAP_SPICSDisable(LSPI_BASE);
//Disable SPI Channel
MAP_SPIDisable(ulBase);
// Reset SPI
MAP_SPIReset(ulBase);
// Disable SPI Peripheral
MAP_PRCMPeripheralClkDisable(PRCM_LSPI,PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK);
return 0;
}
/*!
\brief closes an opened spi communication port
\param fd - file descriptor of an opened SPI channel
\return upon successful completion, the function shall return 0.
Otherwise, -1 shall be returned
\sa spi_Open
\note
\warning
*/
int spi_Read(Fd_t fd, unsigned char *pBuff, int len)
{
if (fd != 1 || g_SpiFd != 1) {
return -1;
}
return spi_Read_CPU(pBuff, len);
}
/*!
\brief attempts to write up to len bytes to the SPI channel
\param fd - file descriptor of an opened SPI channel
\param pBuff - points to first location to start getting the data from
\param len - number of bytes to write to the SPI channel
\return upon successful completion, the function shall return 0.
Otherwise, -1 shall be returned
\sa spi_Open , spi_Read
\note This function could be implemented as zero copy and return only upon successful completion
of writing the whole buffer, but in cases that memory allocation is not too tight, the
function could copy the data to internal buffer, return back and complete the write in
parallel to other activities as long as the other SPI activities would be blocked untill
the entire buffer write would be completed
\warning
*/
int spi_Write(Fd_t fd, unsigned char *pBuff, int len)
{
if (fd != 1 || g_SpiFd != 1) {
return -1;
}
return spi_Write_CPU(pBuff,len);
}
/*!
\brief register an interrupt handler for the host IRQ
\param InterruptHdl - pointer to interrupt handler function
\param pValue - pointer to a memory strcuture that is passed to the interrupt handler.
\return upon successful registration, the function shall return 0.
Otherwise, -1 shall be returned
\sa
\note If there is already registered interrupt handler, the function should overwrite the old handler
with the new one
\warning
*/
int NwpRegisterInterruptHandler(P_EVENT_HANDLER InterruptHdl , void* pValue)
{
if(InterruptHdl == NULL)
{
//De-register Interprocessor communication interrupt between App and NWP
#ifdef SL_PLATFORM_MULTI_THREADED
osi_InterruptDeRegister(INT_NWPIC);
#else
MAP_IntDisable(INT_NWPIC);
MAP_IntUnregister(INT_NWPIC);
MAP_IntPendClear(INT_NWPIC);
#endif
}
else
{
#ifdef SL_PLATFORM_MULTI_THREADED
MAP_IntPendClear(INT_NWPIC);
osi_InterruptRegister(INT_NWPIC, (P_OSI_INTR_ENTRY)InterruptHdl,INT_PRIORITY_LVL_1);
#else
MAP_IntRegister(INT_NWPIC, InterruptHdl);
MAP_IntPrioritySet(INT_NWPIC, INT_PRIORITY_LVL_1);
MAP_IntPendClear(INT_NWPIC);
MAP_IntEnable(INT_NWPIC);
#endif
}
return 0;
}
/*!
\brief Masks host IRQ
\sa NwpUnMaskInterrupt
\warning
*/
void NwpMaskInterrupt()
{
(*(unsigned long *)REG_INT_MASK_SET) = 0x1;
}
/*!
\brief Unmasks host IRQ
\sa NwpMaskInterrupt
\warning
*/
void NwpUnMaskInterrupt()
{
(*(unsigned long *)REG_INT_MASK_CLR) = 0x1;
}
#ifdef DEBUG
/*!
\brief Preamble to the enabling the Network Processor.
Placeholder to implement any pre-process operations
before enabling networking operations.
\sa sl_DeviceEnable
\note belongs to \ref ported_sec
*/
void NwpPowerOnPreamble(void)
{
#define MAX_RETRY_COUNT 1000
unsigned int sl_stop_ind, apps_int_sts_raw, nwp_lpds_wake_cfg;
unsigned int retry_count;
/* Perform the sl_stop equivalent to ensure network services
are turned off if active */
HWREG(0x400F70B8) = 1; /* APPs to NWP interrupt */
UtilsDelay(800000/5);
retry_count = 0;
nwp_lpds_wake_cfg = HWREG(0x4402D404);
sl_stop_ind = HWREG(0x4402E16C);
if((nwp_lpds_wake_cfg != 0x20) && /* Check for NWP POR condition */
!(sl_stop_ind & 0x2)) /* Check if sl_stop was executed */
{
/* Loop until APPs->NWP interrupt is cleared or timeout */
while(retry_count < MAX_RETRY_COUNT)
{
apps_int_sts_raw = HWREG(0x400F70C0);
if(apps_int_sts_raw & 0x1)
{
UtilsDelay(800000/5);
retry_count++;
}
else
{
break;
}
}
}
HWREG(0x400F70B0) = 1; /* Clear APPs to NWP interrupt */
UtilsDelay(800000/5);
/* Stop the networking services */
NwpPowerOff();
}
#endif
/*!
\brief Enable the Network Processor
\sa sl_DeviceDisable
\note belongs to \ref ported_sec
*/
void NwpPowerOn(void)
{
//bring the 1.32 eco out of reset
HWREG(0x4402E16C) &= 0xFFFFFFFD;
//NWP Wakeup
HWREG(0x44025118) = 1;
#ifdef DEBUG
UtilsDelay(8000000);
#endif
//UnMask Host Interrupt
NwpUnMaskInterrupt();
}
/*!
\brief Disable the Network Processor
\sa sl_DeviceEnable
\note belongs to \ref ported_sec
*/
void NwpPowerOff(void)
{
//Must delay 300 usec to enable the NWP to finish all sl_stop activities
UtilsDelay(300*80/3);
//Mask Host Interrupt
NwpMaskInterrupt();
//Switch to PFM Mode
HWREG(0x4402F024) &= 0xF7FFFFFF;
//sl_stop eco for PG1.32 devices
HWREG(0x4402E16C) |= 0x2;
UtilsDelay(800000);
}