CC2541 I2C EEPROM例程 AT24C512

littleshrimp

CC2541 I2C EEPROM例程 AT24C512 [复制链接]

本帖最后由 littleshrimp 于 2015-12-8 14:34 编辑

94.cc2541 i2c eepro frame fm24v10.rar (22.24 KB, 下载次数: 38)

#include "hal_types.h"
#include "hal_defs.h"
#include "ioCC254x_bitdef.h"
#include <ioCC2541.h>
#include "i2c.h"
uint8 buf [20] = {8,2,3,4,5};
uint8 bufr [20] = {0,0,0,0,0};
void eeprom_test(void)
{
uint16 i;
eepromInit(0x50);
for(i=0;i<40;i++)
{
buf[i] = 255-i;
}
eepromWrite(0,buf,40);
for(i=0;i<40;i++)
{
bufr[i] = 0;
}
for(i=0;i<65500;i++);
eepromRead(0,bufr,20);
}
int main( void )
{
uint8 i;
/****************************************************************************
* Clock setup
* See basic software example "clk_xosc_cc254x"
*/
// Set system clock source to HS XOSC, with no pre-scaling.
CLKCONCMD = (CLKCONCMD & ~(CLKCON_OSC | CLKCON_CLKSPD)) | CLKCON_CLKSPD_32M;
// Wait until clock source has changed
while (CLKCONSTA & CLKCON_OSC);
eeprom_test();
while(1)
{
}
}

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/* ------------------------------------------------------------------------------------------------
* Includes
* ------------------------------------------------------------------------------------------------
*/
#include "i2c.h"
/* ------------------------------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------------------------------
*/
#define I2C_ENS1 BV(6)
#define I2C_STA BV(5)
#define I2C_STO BV(4)
#define I2C_SI BV(3)
#define I2C_AA BV(2)
#define I2C_MST_RD_BIT BV(0) // Master RD/WRn bit to be OR'ed with Slave address.
#define I2C_CLOCK_MASK 0x83
#define I2C_PXIFG P2IFG
#define I2C_IF P2IF
#define I2C_IE BV(1)
/* ------------------------------------------------------------------------------------------------
* Typedefs
* ------------------------------------------------------------------------------------------------
*/
typedef enum
{
// HAL_I2C_MASTER mode statuses.
mstStarted = 0x08,
mstRepStart = 0x10,
mstAddrAckW = 0x18,
mstAddrNackW = 0x20,
mstDataAckW = 0x28,
mstDataNackW = 0x30,
mstLostArb = 0x38,
mstAddrAckR = 0x40,
mstAddrNackR = 0x48,
mstDataAckR = 0x50,
mstDataNackR = 0x58,
} i2cStatus_t;
/* ------------------------------------------------------------------------------------------------
* Macros
* ------------------------------------------------------------------------------------------------
*/
#define I2C_WRAPPER_DISABLE() st( I2CWC = 0x00; )
#define I2C_CLOCK_RATE(x) st( I2CCFG &= ~I2C_CLOCK_MASK; \
I2CCFG |= x; )
#define I2C_SET_NACK() st( I2CCFG &= ~I2C_AA; )
#define I2C_SET_ACK() st( I2CCFG |= I2C_AA; )
// Enable I2C bus
#define I2C_ENABLE() st( I2CCFG |= (I2C_ENS1); )
#define I2C_DISABLE() st( I2CCFG &= ~(I2C_ENS1); )
// Must clear SI before setting STA and then STA must be manually cleared.
#define I2C_STRT() st ( \
I2CCFG &= ~I2C_SI; \
I2CCFG |= I2C_STA; \
while ((I2CCFG & I2C_SI) == 0); \
I2CCFG &= ~I2C_STA; \
)
// Must set STO before clearing SI.
#define I2C_STOP() st ( \
I2CCFG |= I2C_STO; \
I2CCFG &= ~I2C_SI; \
while ((I2CCFG & I2C_STO) != 0); \
)
// Stop clock-stretching and then read when it arrives.
#define I2C_READ(_X_) st ( \
I2CCFG &= ~I2C_SI; \
while ((I2CCFG & I2C_SI) == 0); \
(_X_) = I2CDATA; \
)
// First write new data and then stop clock-stretching.
#define I2C_WRITE(_X_) st ( \
I2CDATA = (_X_); \
I2CCFG &= ~I2C_SI; \
while ((I2CCFG & I2C_SI) == 0); \
)
/* ------------------------------------------------------------------------------------------------
* Local Variables
* ------------------------------------------------------------------------------------------------
*/
static uint8 i2cAddr; // Target Slave address pre-shifted up by one leaving RD/WRn LSB as zero.
/**************************************************************************************************
* @fn i2cMstStrt
*
* @brief Attempt to send an I2C bus START and Slave Address as an I2C bus Master.
*
* input parameters
*
* @param RD_WRn - The LSB of the Slave Address as Read/~Write.
*
* @return The I2C status of the START request or of the Slave Address Ack.
*/
static uint8 i2cMstStrt(uint8 RD_WRn)
{
I2C_STRT();
if (I2CSTAT == mstStarted) /* A start condition has been transmitted */
{
I2C_WRITE(i2cAddr | RD_WRn);
}
return I2CSTAT;
}
/**************************************************************************************************
* @fn HalI2CInit
*
* @brief Initialize the I2C bus as a Master.
*
* input parameters
*
* @param address - I2C slave address.
* @param clockRate - I2C clock rate.
*
* output parameters
*
* None.
*
* @return None.
*/
void eepromInit(uint8 address)
{
i2cAddr = address << 1;
I2C_WRAPPER_DISABLE();
I2CADDR = 0; // no multi master support at this time
I2C_CLOCK_RATE(i2cClock_123KHZ);
I2C_ENABLE();
}
/**************************************************************************************************
* @fn HalI2CRead
*
* @brief Read from the I2C bus as a Master.
*
* input parameters
*
* @param len - Number of bytes to read.
* @param pBuf - Pointer to the data buffer to put read bytes.
*
* output parameters
*
* None.
*
* @return The number of bytes successfully read.
*/
bool eepromRead(uint16 addr, uint8 *pBuf, uint16 len)
{
uint8 cnt = 0;
eepromWrite(0,(uint8 *)(&addr),0);
if (i2cMstStrt(I2C_MST_RD_BIT) != mstAddrAckR)
{
len = 0;
}
// All bytes are ACK'd except for the last one which is NACK'd. If only
// 1 byte is being read, a single NACK will be sent. Thus, we only want
// to enable ACK if more than 1 byte is going to be read.
if (len > 1)
{
I2C_SET_ACK();
}
while (len > 0)
{
// slave devices require NACK to be sent after reading last byte
if (len == 1)
{
I2C_SET_NACK();
}
// read a byte from the I2C interface
I2C_READ(*pBuf++);
cnt++;
len--;
if (I2CSTAT != mstDataAckR)
{
if (I2CSTAT != mstDataNackR)
{
// something went wrong, so don't count last byte
cnt--;
}
break;
}
}
I2C_STOP();
return cnt;
}
/**************************************************************************************************
* @fn HalI2CWrite
*
* @brief Write to the I2C bus as a Master.
*
* input parameters
*
* @param len - Number of bytes to write.
* @param pBuf - Pointer to the data buffer to write.
*
* output parameters
*
* None.
*
* @return The number of bytes successfully written.
*/
uint8 eepromWrite(uint16 addr, uint8 *pBuf, uint16 len)
{
if (i2cMstStrt(0) != mstAddrAckW)
{
len = 0;
}
I2C_WRITE(addr>>8);
I2C_WRITE(addr);
// for (uint8 cnt = 0; cnt < 2; cnt++)
// {
// I2C_WRITE(0);
//
// if (I2CSTAT != mstDataAckW)
// {
// if (I2CSTAT == mstDataNackW)
// {
// len = cnt + 1;
// }
// else
// {
// len = cnt;
// }
// break;
// }
// }
for (uint8 cnt = 0; cnt < len; cnt++)
{
I2C_WRITE(*pBuf++);
if (I2CSTAT != mstDataAckW)
{
if (I2CSTAT == mstDataNackW)
{
len = cnt + 1;
}
else
{
len = cnt;
}
break;
}
}
I2C_STOP();
return len;
}

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