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/*
* I2C_Comm.c
*
* Created on: Jun 12, 2018
* Author: avi
*/
#include <stdint.h>
#include <stdbool.h>
#include "include.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/tm4c1294ncpdt.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/i2c.h"
#include "inc/hw_i2c.h"
#include "i2c_fifo.h"
#include "i2c.h"
uint32_t LastReadI2C_BASE; unsigned char LastReadaddr; unsigned char* LastReaddata; unsigned int LastReadlen;
uint32_t LastWriteI2C_BASE; unsigned char LastWriteaddr; unsigned char *LastWritedata; unsigned int LastWritelen;
Task_Handle TaskId;
uint32_t Arb_Loss_Count = 0;
//*****************************************************************************
//! Indicates whether or not the I2C bus has timed out.
//!
//! \param ui32Base is the base address of the I2C module.
//!
//! This function returns an indication of whether or not the I2C bus has time
//! out. The I2C Master Timeout Value must be set.
//!
//! \return Returns \b true if the I2C bus has timed out; otherwise, returns
//! \b false.
//*****************************************************************************
char I2CErrMsg[181];
uint32_t I2C_WriteBuff(uint32_t I2C_BASE, unsigned char addr, unsigned char* data, unsigned int len)
{
uint32_t status = OK;
uint32_t I2C_BUSY_DELAY;
if(I2C_BASE == I2C4_BASE)
{
I2C_BUSY_DELAY = I2C_4_BUSY_DELAY;
}
else
{
I2C_BUSY_DELAY = I2C_2_3_BUSY_DELAY;
}
if (I2CMasterBusy(I2C_BASE))
{
ReportWithPackageFilter(CommFilter,"I2C_WriteBuff busy", __FILE__,__LINE__,status, RpMessage, Task_self(), 0);
return 0xFF;
}
I2CMasterSlaveAddrSet(I2C_BASE, addr, false);
I2CMasterDataPut(I2C_BASE, *data);
if (len == 1)
{
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_SINGLE_SEND);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
}
else
{
// Start sending consecutive data
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_SEND_START);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
len--;
data++;
// Continue sending consecutive data
while(len > 1){
I2CMasterDataPut(I2C_BASE, *data);
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
len--;
data++;
}
// Send last piece of data
I2CMasterDataPut(I2C_BASE, *data);
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
}
return status;
}
uint32_t I2C_ReadBuff(uint32_t I2C_BASE, unsigned char addr, unsigned char* data, unsigned int len)
{
uint32_t status = OK;
uint32_t I2C_BUSY_DELAY;
if(I2C_BASE == I2C4_BASE)
{
I2C_BUSY_DELAY = I2C_4_BUSY_DELAY;
}
else
{
I2C_BUSY_DELAY = I2C_2_3_BUSY_DELAY;
}
if (I2CMasterBusy(I2C_BASE))
{
ReportWithPackageFilter(CommFilter,"I2C_ReadBuff busy", __FILE__,__LINE__, status, RpMessage, Task_self(), 0);
return 0xFF;
}
/*if (Task_self()!= I2C_Task_Handle)
{
status = ERROR;
}
status = OK;*/
I2CMasterSlaveAddrSet(I2C_BASE, addr, true);
if (len == 1)
{
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
//On the TM4C129 we discovered a design behavior that due to higher system clock frequency and lower I2C baud rate,
//the CPU when it starts a I2C Transaction or writes a new I2C Command, for the I2C to respond to it takes time.
//So in effect the I2CMasterBusy statement gets skipped which causes The I2C controller to lose data.
//see: https://e2e.ti.com/support/microcontrollers/other/f/908/t/368493?Why-is-a-delay-needed-before-writing-the-first-byte-from-I2C-Master-
//therefore we need delay before waiting until bus is not busy - it doesn't work as expected without it or with while(!(I2CMasterBusy(I2C0_BASE)
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
*data = I2CMasterDataGet(I2C_BASE);
}
else
{
// Start receiving consecutive data
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
*data = I2CMasterDataGet(I2C_BASE);
len--;
data++;
// Continue receiving consecutive data
while(len > 1){
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
*data = I2CMasterDataGet(I2C_BASE);
len--;
data++;
}
// Receive last piece of data
I2CMasterControl(I2C_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
SysCtlDelay(I2C_BUSY_DELAY);//The CPU waits for the Command processing to begin before it goes to check if the command is processed
status |= I2CMasterErr(I2C_BASE);
while(I2CMasterBusy(I2C_BASE));
*data = I2CMasterDataGet(I2C_BASE);
}
return status;
}
uint32_t I2C_Write(uint32_t I2C_ID, uint32_t Slave_Add, uint8_t *I2C_Write_buf, uint32_t No_BytesToWrite )
{
uint32_t status = OK;
uint32_t I2C_BASE;
if (I2C_ID == 4)
I2C_BASE = I2C4_BASE;
else
if (I2C_ID == 3)
I2C_BASE = I2C3_BASE;
else
if (I2C_ID == 2)
I2C_BASE = I2C2_BASE;
else
return ERROR;
/* if (Task_self()!=I2C_Task_Handle)
{
ReportWithPackageFilter(CommFilter,"I2C_Write called from different task", __FILE__,__LINE__, I2C_Task_Handle, RpMessage, Task_self(), 0);
}*/
/* if ( (Slave_Add != 0xE0) && (Slave_Add != 0xE4) && (Slave_Add != 0xE3) &
(Slave_Add != 0x40) && (Slave_Add != 0x44) && (Slave_Add != 0x46) &
(Slave_Add != 0x98) && (Slave_Add != 0xA0) )
return ERROR;*/
Slave_Add = Slave_Add>>1;
//Byte2Write = Byte2Write & 0xFF;
status = I2C_WriteBuff(I2C_BASE, Slave_Add, I2C_Write_buf, No_BytesToWrite);
//status = I2C_WriteFifo(I2C_BASE, Slave_Add, buff, No_BytesToWrite);
/*if(No_BytesToWrite <= 2)
{
status = I2C_WriteBuff(I2C_BASE, Slave_Add, I2C_Write_buf, No_BytesToWrite);
}
else
{
status = I2C_WriteFifo(I2C_BASE, Slave_Add, buff, No_BytesToWrite);
}*/
if (status == OK)
{
//LastWriteI2C_BASE = I2C_BASE;
LastWriteaddr = Slave_Add;
LastWritedata = I2C_Write_buf;
LastWritelen = No_BytesToWrite;
TaskId = Task_self();
}
else
{
usnprintf(I2CErrMsg, 180, "I2C Err write 0x%x 0x%x, last good read 0x%x, %d, write 0x%x, %d, T 0x%x 0x%x",status,Slave_Add,
LastReadaddr, LastReadlen,
LastWriteaddr, LastWritelen, Task_self(),TaskId);
Report(I2CErrMsg, __FILE__, __LINE__, status, RpWarning, Slave_Add, 0);
}
//uint32_t I2C_W_buf[256] = {0},i;
// for(i = 0; i < request->n_bytestwrite;i++)
// {
// I2C_W_buf[i] = request->bytestwrite[i];
// }
if (status)
{
if (Arb_Loss_Count++ >= 5)
{
Arb_Loss_Count= 0;
Init_All_I2C();
ReportWithPackageFilter(CommFilter,"Reinitializing I2C master", __FILE__,__LINE__, status, RpMessage, Task_self(), 0);
}
}
/*else
{
if (Arb_Loss_Count)
ReportWithPackageFilter(CommFilter,"Resetting count", __FILE__, Arb_Loss_Count, status, RpMessage, Task_self(), 0);
//Arb_Loss_Count = 0;
}*/
return status;
}
uint32_t I2C_Read(uint32_t I2C_ID, uint32_t Slave_Add, uint8_t *I2C_Read_buf, uint32_t No_BytesToRead )
{
uint32_t status = OK;
uint32_t I2C_BASE;
if (I2C_ID == 4)
I2C_BASE = I2C4_BASE;
else
if (I2C_ID == 3)
I2C_BASE = I2C3_BASE;
else
if (I2C_ID == 2)
I2C_BASE = I2C2_BASE;
else
return ERROR;
/* if ( (Slave_Add != 0xE0) && (Slave_Add != 0xE4) && (Slave_Add != 0xE3) &
(Slave_Add != 0x40) && (Slave_Add != 0x44) && (Slave_Add != 0x46) &
(Slave_Add != 0x98) && (Slave_Add != 0xA0) )
return ERROR;*/
/*if (Task_self()!=I2C_Task_Handle)
{
ReportWithPackageFilter(CommFilter,"I2C_Write called from different task", __FILE__,__LINE__, I2C_Task_Handle, RpMessage, Task_self(), 0);
}*/
Slave_Add = Slave_Add>>1;
//Byte2Write = Byte2Write & 0xFF;
status = I2C_ReadBuff(I2C_BASE, Slave_Add, I2C_Read_buf, No_BytesToRead);
if (status)
{
if (Arb_Loss_Count++ >= 5)
{
Arb_Loss_Count= 0;
Init_All_I2C();
ReportWithPackageFilter(CommFilter,"Reinitializing I2C master", __FILE__,__LINE__, status, RpMessage, Task_self(), 0);
}
}
if (status == OK)
{
//LastReadI2C_BASE = I2C_BASE;
LastReadaddr = Slave_Add;
LastReaddata = I2C_Read_buf;
LastReadlen = No_BytesToRead;
TaskId = Task_self();
}
else
{
usnprintf(I2CErrMsg, 180, "I2C Err read 0x%x 0x%x, last good read 0x%x, %d, write 0x%x, %d, T 0x%x 0x%x",status,Slave_Add,
LastReadaddr, LastReadlen,
LastWriteaddr, LastWritelen, Task_self(),TaskId);
Report(I2CErrMsg, __FILE__, __LINE__, status, RpWarning, Slave_Add, 0);
}
/*else
{
if (Arb_Loss_Count)
ReportWithPackageFilter(CommFilter,"Resetting count", __FILE__, Arb_Loss_Count, status, RpMessage, Task_self(), 0);
//Arb_Loss_Count = 0;
}*/
return status;
}
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