Hi all, I'm trying to get i2c work as a slave (on GPIO 32 and 33) in lab_5b but it doesn't work.
I have a LaunchXL F28027F and a BoostXL-DRV8301
I use a atmel avr as a master, the i2c clock is at 100khz.Both sda and scl havea 4.7kohms pull up.
I use the i2c.c/h from maria
e2e.ti.com/.../1203642
When the MCU starts, there some signals on scl and sda pin (I don't know why)
and then the SDA and SCL line go low (If i am right they should be high)
What I have done :
in hal_obj.h I had
typedef struct _HAL_Obj_
{
...
I2C_Handle i2cAHandle; //!< the I2CA handle
I2C_Obj i2cA; //!< the I2CA object
} HAL_Obj;
in hal.c i added some code in existing functions :
in HAL_Handle HAL_init(void *pMemory,const size_t numBytes)
{
...
// initialize the I2C handle
obj->i2cAHandle = I2C_init((void *)I2CA_BASE_ADDR,sizeof(I2C_Obj));
...
}
void HAL_setParams(HAL_Handle handle,const USER_Params *pUserParams)
{
...
// setup the i2cA
HAL_setupI2cA(handle);
...
}
void HAL_setupGpios(HAL_Handle handle)
{
...
//I2C SDA
GPIO_setMode(obj->gpioHandle,GPIO_Number_32,GPIO_32_Mode_SDAA);
//I2C SCL
GPIO_setMode(obj->gpioHandle,GPIO_Number_33,GPIO_33_Mode_SCLA);
...
}
void HAL_setupPeripheralClks(HAL_Handle handle)
{
...
CLK_enableI2cClock(obj->clkHandle);
...
}
I added some function in hal.c/h
void HAL_setupI2cA(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *)handle;
I2C_resetAll(obj->i2cAHandle);
I2C_setupClock(obj->i2cAHandle,4,55,55); //I2C Clock module à 12MHz clock scl à 100khz
I2C_setSlave(obj->i2cAHandle); //Mode Slave
I2C_setSlaveAddress(obj->i2cAHandle,0x50);
I2C_enable(obj->i2cAHandle); //enable i2c
return;
} // end of HAL_setupI2cA() function
void HAL_enableI2cInt(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *)handle;
PIE_enableI2cInt(obj->pieHandle);
//I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Arb_Lost);
//I2C_enableInt(obj->i2cAHandle,I2C_IntEn_NACK);
I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Reg_Rdy);
I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Rx_Rdy);
//I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Tx_Rdy);
//I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Stop);
//I2C_enableInt(obj->i2cAHandle,I2C_IntEn_Slave_Addr);
// enable the cpu interrupt for TINT8
CPU_enableInt(obj->cpuHandle,CPU_IntNumber_8);
return;
}
in hal.h i added
extern interrupt void i2cISR(void);
//! \brief Acknowledges an interrupt from i2c so that another i2c interrupt can
//! happen again.
//! \param[in] handle The hardware abstraction layer (HAL) handle
static inline void HAL_acqI2cInt(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *)handle;
//I2C_clearTxFifoInt(obj->i2cAHandle);
//I2C_clearRxFifoInt(obj->i2cAHandle);
I2C_clearRRDYflag(obj->i2cAHandle);
// Acknowledge interrupt from PIE group 8
PIE_clearInt(obj->pieHandle,PIE_GroupNumber_8);
return;
}
and I modified
static inline void HAL_initIntVectorTable(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *)handle;
PIE_Obj *pie = (PIE_Obj *)obj->pieHandle;
ENABLE_PROTECTED_REGISTER_WRITE_MODE;
//pie->I2CINT2A = &i2cISR; //I2C FIFO interrupt
pie->I2CINT1A = &i2cISR; //I2C interrupt
pie->ADCINT1 = &mainISR;
DISABLE_PROTECTED_REGISTER_WRITE_MODE;
return;
} // end of HAL_initIntVectorTable() function
in pie.c I added
void PIE_enableI2cInt(PIE_Handle pieHandle)
{
PIE_Obj *pie = (PIE_Obj *)pieHandle;
// set the value
pie->PIEIER_PIEIFR[7].IER |= PIE_IERx_INTx1_BITS;
return;
} // end of PIE_enableI2cInt() function
In the main, before the forever loop I put
//enable I2c interrupts
HAL_enableI2cInt(halHandle);
And my i2cisr does not do someting except
interrupt void i2cISR(void)
{
//Read the interrupt source
//acknoledge the I2C interrupt
HAL_acqI2cInt(halHandle);
// I2C_IntSource_e source;
HAL_toggleLed(halHandle,(GPIO_Number_e)HAL_Gpio_LED2);
I2cSource = HAL_getIntSourceI2c(halHandle);
I2cStatus = HAL_getStatusI2c(halHandle);
switch(I2cSource)
{
case I2C_IntSrc_None: //!< No Interrupt
case I2C_IntSrc_Arb_Lost : //!< Arbitration Lost
case I2C_IntSrc_NACK: //!< No-Acknowledge Detected
case I2C_IntSrc_Stop: //!< Stop Condition Detected
case I2C_IntSrc_Slave_Addr: //!< Addressed as Slave
case I2C_IntSrc_Reg_Rdy: //!< Register Ready for Access
break;
case I2C_IntSrc_Rx_Rdy: //!< Recieve Data Ready
break;
case I2C_IntSrc_Tx_Rdy: //!< Transmit Data Ready
break;
}
gLEDcnt++;
return;
}
When i start the MCU, The I2C registers are I think correct (set as setup in HAL_setupI2cA(handle);
The odd thing is I got some signals in i2c pin even if nothing is plugged on i2c pins.
The gLEDcnt variable is 1, so it enter in the i2cisr and then the i2c pins are both low.
so no communication is possible.
I tried to put the HAL_enableI2cInt(halHandle) in the forever lopp after the while(!(gMotorVars.Flag_enableSys));
It is the same behavior expt that the gLEDcnt is still a t 0 but i2c pins are low.
The signals in i2c pinsat startup are there even if i didn't do a HAL_setupI2c.
What's wrong ? where is the mistake ?
Thank you
