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Hello everyone,
I'm a fresher of coding TM4C123GH6PM microcontroller. I have some questions like this:
1) I'm working with I2C on this board. The code is fine and there are no errors in it but I'm unable to write and read the data from the slave. I'm using TMS123GH6PM as a master and AT24C04 as a slave. Here is my code. Please check it for me.
2) I want to use I2C to communicate several TM4C123GXL boards. So how Can I find the address of each I2C module in TM4C123GXL board?
Thanks,
Best regards,
#define ADDRESS_DEVICE 0x50 //0x24HC04 (A0, A1 = LOW)
#include "I2C.h"
void Config_I2C(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinConfigure(GPIO_PA6_I2C1SCL);
GPIOPinConfigure(GPIO_PA7_I2C1SDA);
GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_6);
GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_7);
I2CMasterInitExpClk(I2C1_BASE, SysCtlClockGet(), true);
}
void I2c_Read_Buffer(uint8_t regAddress, uint8_t *pData, uint8_t length)
{
I2CMasterSlaveAddrSet(I2C1_BASE, ADDRESS_DEVICE, false);
I2CMasterDataPut(I2C1_BASE, regAddress);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_SINGLE_SEND);
while(I2CMasterBusy(I2C1_BASE));
I2CMasterSlaveAddrSet(I2C1_BASE, ADDRESS_DEVICE, true);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
while(I2CMasterBusy(I2C1_BASE));
pData[0]=I2CMasterDataGet(I2C1_BASE);
uint8_t index=1;
for(index=1;index<length-1;index++)
{
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
while(I2CMasterBusy(I2C1_BASE));
pData[index]=I2CMasterDataGet(I2C1_BASE);
}
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
while(I2CMasterBusy(I2C1_BASE));
pData[index]=I2CMasterDataGet(I2C1_BASE);
}
void I2c_Read_Char(uint8_t regAddress, uint8_t *pData)
{
I2CMasterSlaveAddrSet(I2C1_BASE, ADDRESS_DEVICE, false);
I2CMasterDataPut(I2C1_BASE, regAddress);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_SINGLE_SEND);
while(I2CMasterBusy(I2C1_BASE));
I2CMasterSlaveAddrSet(I2C1_BASE, ADDRESS_DEVICE, true);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
while(I2CMasterBusy(I2C1_BASE));
*pData=I2CMasterDataGet(I2C1_BASE);
}
void I2c_Write_Buffer(uint8_t regAddress, uint8_t *pData, uint8_t length)
{
I2CMasterSlaveAddrSet(I2C1_BASE, ADDRESS_DEVICE, false);
I2CMasterDataPut(I2C1_BASE, regAddress);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C1_BASE));
uint8_t index=0;
for(index=0;index<length-1;index++)
{
I2CMasterDataPut(I2C1_BASE, pData[index]);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(I2CMasterBusy(I2C1_BASE));
}
I2CMasterDataPut(I2C1_BASE, pData[length-1]);
I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
while(I2CMasterBusy(I2C1_BASE));
}
Greetings,
Vendor's Charles has delivered his "usual" thoughtful:
We'll thus look more towards your Slave's demands & system implementation.
My small (outsider) group likes much of your posting - especially the neatness of the code & your identification of your "I2C Slave" and your determination of its address. (note to vendor - your syntax highlighter (always) confounds our ability to "edit and/or highlight our comments/corrections!")
We dislike your (poster's) "elimination of "main" - which disables a clear description of your, "Order of function calls" and/or "other program elements" - withheld from "helper view!" (in most cases - if posters' "really knew what could be withheld" - they'd not wind up here...)
Now some more concrete/focused comments:
That's not quite true/correct for your 4Kb device. Your slave's manual reveals:
Thus - you must "Ground pin A2 - which you've not presented here" and A0 (you marked low) is a "No Connect."
Your Slave manual presents a far simpler "Write Method" - and mastery of that is likely, "Faster, easier & more destined to succeed."
The far more complex "buffer" opens up multiple "Avenues of Error" - many of which bear "No Relationship" to I2C! Indeed that buffer idea may prove useful "downstream" (later) - but is premature now - and (almost) guarantees that your program will "fail to meet objectives." KISS rules - one small (and eased, measured/verified) Step at a Time!
Hi,
You did not answer me if you have the pullup resistors on the SDA and SCL bus. Without the scope/LA capture, it is difficult what is going on on the bus. You read the data into the pData array. What is the size of the pData? Note that the return value of the I2CMasterDataGet is cast to 32 bit. Also check if you are getting any errors. Check the ERROR bit in the I2CMCS register.
