Hello,
Is it possible to call the I2C driver from multiple threads in SYSBIOS 6.35? At the moment it seems that I get an occasional exception on my C6748 custom board.
This is what I have in my .cfg file:
var dev1Params = new DEV.Params();
dev1Params.instance.name = "devI2c_0";
dev1Params.initFxn = "&userI2cInit";
dev1Params.deviceParams = "&g_i2cParams";
dev1Params.devid = 0;
Program.global.devI2c_0 = DEV.create("/i2c0", "&I2c_IOMFXNS", dev1Params);
And in C++ program:
I2c_Params g_i2cParams;
/*
* I2C0 init function called when creating the driver.
*/
extern "C"
{
void userI2cInit()
{
I2c_init();
g_i2cParams = I2c_PARAMS;
g_i2cParams.busFreq = TWI0_MODULE_CLOCK; //max 100kHz supported by my I2C devices
g_i2cParams.hwiNumber = 8;
/* configure I2c for interrupt mode */
g_i2cParams.opMode = I2c_OpMode_INTERRUPT;
g_i2cParams.edma3EventQueue = 1;//CC0, TC1
System_printf("I2C Driver Initialisation\n");
}
Then I called Open function in the initial thread:
void Open()
{
Error_Block eb;
I2c_ChanParams chanParams;
GIO_Params ioParams;
Error_init(&eb);
/*
* Initialise channel attributes.
*/
GIO_Params_init(&ioParams);
chanParams.hEdma = GetDMA0().GetHandle();
chanParams.masterOrSlave = I2c_CommMode_MASTER;
ioParams.chanParams = &chanParams;
System_printf("\r\nI2C Open instance\n");
/* Create the I2C Channels for the TX and RX communication */
m_i2c_outHandle = GIO_create("/i2c0", GIO_OUTPUT, &ioParams, &eb);
m_i2c_inHandle = GIO_create("/i2c0", GIO_INPUT, &ioParams, &eb);
}
My threads call the following function for same I2C device address:
uint8_t I2CDrv::Receive(uint8_t addr, uint8_t *pReadBuffer, uint16_t bufferLength, bool bRepeat)
{
I2c_DataParam dataBuffer;
UInt32 size = 0;
if(m_i2c_inHandle == NULL)
{
System_printf("I2c Read: port not opened");
return 0;
}
/* Assign data into output buffer */
/* First command word and then the data */
/* Prepare the data to be written to the port */
dataBuffer.slaveAddr = addr;
dataBuffer.buffer = pReadBuffer;
dataBuffer.bufLen = bufferLength;
dataBuffer.flags = I2c_READ | I2c_MASTER | I2c_START | I2c_STOP;
/* Write the data to I2c expander */
uint32_t error = GIO_submit(m_i2c_inHandle,
IOM_READ,
&dataBuffer,
&dataBuffer.bufLen,
NULL);
if ((error != 0) && (dataBuffer.bufLen != size))
{
System_printf("I2c Read: Data Read Failed: %d\n", error);
return 0;
}
return 1;
}
Thank you in advance,
David.
