Posted on May 17, 2011 at 11:36Good morning to everyone!!
Theseday, i am working a slave mode between two ST9s.
One of ST9 is a master mode and another is a slave mode.
I believe that master mode is working well, becaues i have used it
with some slave devices.
It is problem that ST9(slave mode) does not match slave address (I2COAR1, 7 bit mode)
I want to set a slave address which is 0x08 (7bit mode by I2COAR1)
Please, check files attached below.
#define __I2C_C__
#include ''device.h''
#include ''i2c.h''
static unsigned char i2c_sr1;
static unsigned char i2c_sr2;
static unsigned char *i2c_data;
void I2cInit( void )
{
I2cPortInit();
spp(I2C_PG);
// Set the frequency bits before enabling the interface
I2COAR2 = 0xC0; // I2C Own Address Register 2
// - INTCLK between 14 and 30MHz (24MHz)
// - 7-bit mode
I2CCR = 0x00; // I2C Control Register
// - peripheral OFF
// Init interrupt
I2CISR = 7; // I2C Status Register
I2CIVR = 0x30; // I2C Vector register
// 30h : not used
// 32h : error condition detected
// 34h : data received
// 36h : I2C ready to transmit
I2CIMR = I2Cm_IERRM | I2Cm_IRXM | I2Cm_ITXM;
// I2C Interrupt Mask Register
// - all 3 interrupt sources enabled
// Init I2C config registers
I2CECCR = 0x00; // I2C Extended Clock Control Register
// - CC8-CC7 init (0 !)
I2CCCR = 0x92; // fast mode, 400khz
I2CADR = 0x08; // I2C General Call address
// - general call address to be recognized by the device in slave mode
I2CCR = (I2Cm_PE | I2Cm_ACK | I2Cm_ITE);
I2CCR = (I2Cm_PE | I2Cm_ACK | I2Cm_ITE);
// ENGC bit is cleared
// don't use I2C General Call address
} /* end of I2cInit() */
void I2cPortInit (void)
{
OUT_AFOD( 4, 6 );
OUT_AFOD( 4, 7 );
P4DR |= 0xC0;
} /* end of I2cPortInit() */
void I2cIsr (void)
{
int i;
spp(I2C_PG); // Target I2C control registers page
//Save status registers in static user variables
i2c_sr1 = I2CSR1;
i2c_sr2 = I2CSR2;
// Stop detection bit mask or bus error or ack mask
if ((i2c_sr2 & I2Cm_STOPF) || (i2c_sr2 & I2Cm_AF) || (i2c_sr2 & I2Cm_BERR))
{
I2CCR |= I2Cm_STOP;
}
if (i2c_sr1 & I2Cm_ADSL) //slave mode : EV1
{
*i2c_data = I2CDR; // then send stop bit
}
if (i2c_sr1 & I2Cm_BTF) // EV2
{
*i2c_data++ = I2CDR;
if (i2c_sr2 & I2Cm_STOPF) // EV4
{
I2CCR |= I2Cm_STOP; // then send stop bit
}
}
} // end of I2cIsr
#pragma interrupt I2cErrIsr
void I2cErrIsr (void)
{
save_page; // Save peripheral page pointer before modifying it
spp(I2C_PG); // Target I2C control registers page
I2CISR &= ~I2Cm_IERRP; // Clear Error Interrupt Flag
I2cIsr();
restore_page;
} /* end of I2cErrIsr() */
#pragma interrupt I2cRxIsr
void I2cRxIsr (void)
{
save_page;
spp(I2C_PG);
I2CISR &= ~I2Cm_IRXP; // Clear Receive Interrupt Flag
I2cIsr();
restore_page;
} /* end of I2cRxIsr() */
#pragma interrupt I2cTxIsr
void I2cTxIsr (void)
{
save_page;
spp(I2C_PG);
I2CISR &= ~I2Cm_ITXP; // Clear Transmit Interrupt Flag
I2cIsr();
restore_page;
} /* end of I2cTxIsr() */
:o
