Tool/software: TI-RTOS
Hi,
i tried to make use of the i2c bound EEPROM on my custom am3358 board (phytec phycore am335x). It is accessable via I2C id 0x52 and i would like to store configuration data in this EEPROM.
I run the I2C read from a task with following code:
char i2c_read(int RegAdd, int address, int channel)
{
uint8_t txBuffer[1] = { RegAdd };
char rxBuffer[1] = { 0 };
I2C_Handle handle;
if (channel == 1)
{
handle = i2c_chan1_init();
}
else if (channel == 0)
{
handle = i2c_chan0_init();
}
int16_t transferStatus;
I2C_Transaction i2cTransaction;
I2C_transactionInit(&i2cTransaction);
i2cTransaction.slaveAddress = address;
i2cTransaction.readBuf = (uint8_t *) &rxBuffer[0];
i2cTransaction.writeBuf = (uint8_t *) &txBuffer[0];
i2cTransaction.writeCount = 1;
i2cTransaction.readCount = 0;
i2cTransaction.timeout = 100;
transferStatus = I2C_transfer(handle, &i2cTransaction);
Task_sleep(100);
i2cTransaction.readBuf = (uint8_t *) &rxBuffer[0];
i2cTransaction.writeBuf = (uint8_t *) &txBuffer[0];
i2cTransaction.writeCount = 0;
i2cTransaction.readCount = 1;
i2cTransaction.timeout = 100;
transferStatus = I2C_transfer(handle, &i2cTransaction);
I2C_close(handle);
return rxBuffer[0];
}
The write function follows this schematic:
int16_t i2c_write(char Buf[5], int address, int channel)
{
I2C_Handle handle;
if (channel == 1)
{
handle = i2c_chan1_init();
}
else if (channel == 0)
{
handle = i2c_chan0_init();
}
int16_t transferStatus;
I2C_Transaction i2cTransaction;
I2C_transactionInit(&i2cTransaction);
i2cTransaction.slaveAddress = address;
i2cTransaction.readBuf = NULL;
i2cTransaction.readCount = 0;
i2cTransaction.writeBuf = (uint8_t *) &Buf[0];
i2cTransaction.writeCount = 2;
i2cTransaction.timeout = 2000;
transferStatus = I2C_transfer(handle, &i2cTransaction);
I2C_close(handle);
return transferStatus;
}
My Problem is that neither the write nor the read function proceed succesfuly and i found no other example for writing or reading the eeprom.
Even when I try to programm the eeprom from within yocto linux with i2cset i am not successfull. The i2cdump returns lots of 0xFF.
The write enable pin is pulled to gnd via a 10kohm resistor on the phycore SOM. I hope you can help me.
Regards,
Jim
EDIT: Is there any existing driver to store data in non volatile memory, e.g. SPI or nand flash ?
