Other Parts Discussed in Thread: OMAP-L137
Tool/software:
Hi.
I'm having trouble writing to the EEPROM with the I2C0 peripheral.
The symptom is that there is no output to SCL and SDA when the DSP is the master.
The I2C0 peripheral is not unpaused by PSC.
It has been confirmed that each register changes normally when I2C_init() and I2C_write() are executed in steps.
It has been confirmed that ICPFUNC0.PFUNC0 is 0 (Disable).
The UART0 peripheral, which is a pin that conflicts with I2C0's SCL and SDA, is in sleep mode.
The SCL and SDA terminals are pulled up with 10kΩ.
The necessary code is partially extracted and listed below.
These codes are based on the code included in OMAP-L137_C6747_BSL.
/*****************************************************/
char pBuff[16];
/*****************************************************/
u16 I2C_init(void)
{
ICMDR0 = 0; // Reset I2C
ICMDR0 |= ICMDR_MST; // Release I2C master
// I2C input clock = 16.384MHz
ICPSC0 = 0x00000001; // IPSC=1 I2C Prescaler = 2
// Prescaled module clock = 16.384MHz / 2 = 8.192MHz
ICCLKL0 = 5; // ICCL=5 (ICCL+6)+(ICCH+6)
ICCLKH0 = 5; // ICCH=5 (ICCL+6)+(ICCH+6)
// SCL = (16.384MHz / 2) / ( (ICCL+6)+(ICCH+6) )
// = (16.384MHz / 2) / 22
// = 372.363kHz
ICSTR0 = ICSTR0;
ICMDR0 |= ICMDR_IRS; // Release I2C from reset
ICSTR0 |= (ICSTR_ARDY | ICSTR_BB);
return 0;
}
/*****************************************************/
s16 I2C_close(void)
{
ICMDR0 = 0; // Reset I2C
return 0;
}
/*****************************************************/
s16 I2C_reset(void)
{
I2C_close();
I2C_init();
return 0;
}
/*****************************************************/
s16 I2C_write( u16 i2c_addr, u08* data, u16 len )
{
s32 timeout, i;
ICCNT0 = len; // Set length
ICSAR0 = i2c_addr; // Set I2C slave address
ICMDR0 = ICMDR_STT // Set for Master Write
| ICMDR_TRX
| ICMDR_MST
| ICMDR_IRS
| ICMDR_FREE;
i2c_wait( 1000 ); // Short delay
for ( i = 0 ; i < len ; i++ )
{
ICDXR0 = data[i]; // Write
timeout = i2c_timeout;
do
{
if ( timeout-- < 0 )
{
I2C_reset();
return -1;
}
} while ( ( ICSTR0 & ICSTR_ICXRDY ) == 0 ); // Wait for Tx Ready
}
ICMDR0 |= ICMDR_STP; // Generate STOP
return 0;
}
/*****************************************************/
void main()
{
s16 ans;
// PLL,PINMUX setting
AUXCLK is 16.384MHz
SYSCNF0.PINMUX8_19_16 = 2 // I2C_SCL
SYSCNF0.PINMUX8_15_12 = 2 // I2C_SDA
...
//
I2C_init();
while(1){
strcpy(pBuff[], "TEST - 0");
ans = I2C_write(pBuff, 0x0FF0, 8); // 0x0FF0 is the write address in the EEPROM
if(ans == 0) break;
}
}
/*****************************************************/
Thanks.
