我正在尝试在dspic33ep上使用mircochip的I2C驱动程序。我打电话给
I2C1_MasterWrite()，它进入else分支，表明即使对象未满也失败了。我想知道是否有人知道如何解决此问题，或者是否有我可以将其用于dspic33ep的I2C驱动程序。
#include "i2c1.h"
typedef union
{
struct
{
uint8_t full:1;
uint8_t empty:1;
uint8_t reserved:6;
}s;
uint8_t status;
} I2C_TR_QUEUE_STATUS;
typedef struct
{
uint8_t count;
I2C1_TRANSACTION_REQUEST_BLOCK *ptrb_list;
I2C1_MESSAGE_STATUS *pTrFlag;
} I2C_TR_QUEUE_ENTRY;
typedef struct
{
I2C_TR_QUEUE_ENTRY *pTrTail;
I2C_TR_QUEUE_ENTRY *pTrHead;
I2C_TR_QUEUE_STATUS trStatus;
uint8_t i2cDoneFlag;
uint8_t i2cErrors;
} I2C_OBJECT ;
typedef enum
{
S_MASTER_IDLE,
S_MASTER_RESTART,
S_MASTER_SEND_ADDR,
S_MASTER_SEND_DATA,
S_MASTER_SEND_STOP,
S_MASTER_ACK_ADDR,
S_MASTER_RCV_DATA,
S_MASTER_RCV_STOP,
S_MASTER_ACK_RCV_DATA,
S_MASTER_NOACK_STOP,
S_MASTER_SEND_ADDR_10BIT_LSB,
S_MASTER_10BIT_RESTART,
} I2C_MASTER_STATES;
#ifndef I2C1_CONFIG_TR_QUEUE_LENGTH
#define I2C1_CONFIG_TR_QUEUE_LENGTH 1
#endif
#define I2C1_TRANSMIT_REG I2C1TRN
#define I2C1_RECEIVE_REG I2C1RCV /
#define I2C1_WRITE_COLLISION_STATUS_BIT I2C1STATbits.IWCOL
#define I2C1_ACKNOWLEDGE_STATUS_BIT I2C1STATbits.ACKSTAT
#define I2C1_START_CONDITION_ENABLE_BIT I2C1CONbits.SEN
#define I2C1_REPEAT_START_CONDITION_ENABLE_BIT I2C1CONbits.RSEN
#define I2C1_RECEIVE_ENABLE_BIT I2C1CONbits.RCEN
#define I2C1_STOP_CONDITION_ENABLE_BIT I2C1CONbits.PEN
#define I2C1_ACKNOWLEDGE_ENABLE_BIT I2C1CONbits.ACKEN
#define I2C1_ACKNOWLEDGE_DATA_BIT I2C1CONbits.ACKDT
static void I2C1_FunctionComplete(void);
static void I2C1_Stop(I2C1_MESSAGE_STATUS completion_code);
static I2C_TR_QUEUE_ENTRY i2c1_tr_queue[I2C1_CONFIG_TR_QUEUE_LENGTH];
static I2C_OBJECT i2c1_object;
static I2C_MASTER_STATES i2c1_state = S_MASTER_IDLE;
static uint8_t i2c1_trb_count;
static I2C1_TRANSACTION_REQUEST_BLOCK *p_i2c1_trb_current;
static I2C_TR_QUEUE_ENTRY *p_i2c1_current = NULL;
void I2C1_Initialize(void)
{
i2c1_object.pTrHead = i2c1_tr_queue;
i2c1_object.pTrTail = i2c1_tr_queue;
i2c1_object.trStatus.s.empty = true;
i2c1_object.trStatus.s.full = false;
i2c1_object.i2cErrors = 0;
I2C1BRG = 0x03;
I2C1CON = 0x8000;
I2C1STAT = 0x00;
IFS1bits.MI2C1IF = 0;
IEC1bits.MI2C1IE = 1;
}
uint8_t I2C1_ErrorCountGet(void)
{
uint8_t ret;
ret = i2c1_object.i2cErrors;
return ret;
}
void __attribute__ ( ( interrupt, no_auto_psv ) ) _MI2C1Interrupt ( void )
{
static uint8_t *pi2c_buf_ptr;
static uint16_t i2c_address;
static uint8_t i2c_bytes_left;
static uint8_t i2c_10bit_address_restart = 0;
IFS1bits.MI2C1IF = 0;
// Check first if there was a collision.
// If we have a Write Collision, reset and go to idle state */
if(I2C1_WRITE_COLLISION_STATUS_BIT)
{
printf("collision\t");
// clear the Write colision
I2C1_WRITE_COLLISION_STATUS_BIT = 0;
i2c1_state = S_MASTER_IDLE;
*(p_i2c1_current->pTrFlag) = I2C1_MESSAGE_FAIL;
// reset the buffer pointer
p_i2c1_current = NULL;
return;
}
/* Handle the correct i2c state */
switch(i2c1_state)
{
case S_MASTER_IDLE: /* In reset state, waiting for data to send */
printf("master idle \t");
if(i2c1_object.trStatus.s.empty != true)
{
// grab the item pointed by the head
p_i2c1_current = i2c1_object.pTrHead;
i2c1_trb_count = i2c1_object.pTrHead->count;
p_i2c1_trb_current = i2c1_object.pTrHead->ptrb_list;
i2c1_object.pTrHead++;
// check if the end of the array is reached
if(i2c1_object.pTrHead == (i2c1_tr_queue + I2C1_CONFIG_TR_QUEUE_LENGTH))
{
// adjust to restart at the beginning of the array
i2c1_object.pTrHead = i2c1_tr_queue;
}
// since we moved one item to be processed, we know
// it is not full, so set the full status to false
i2c1_object.trStatus.s.full = false;
// check if the queue is empty
if(i2c1_object.pTrHead == i2c1_object.pTrTail)
{
// it is empty so set the empty status to true
i2c1_object.trStatus.s.empty = true;
}
// send the start condition
I2C1_START_CONDITION_ENABLE_BIT = 1;
// start the i2c request
i2c1_state = S_MASTER_SEND_ADDR;
}
break;
case S_MASTER_RESTART:
printf("restart\t");
/* check for pending i2c Request */
// ... trigger a REPEATED START
I2C1_REPEAT_START_CONDITION_ENABLE_BIT = 1;
// start the i2c request
i2c1_state = S_MASTER_SEND_ADDR;
break;
case S_MASTER_SEND_ADDR_10BIT_LSB:
printf("s master send 10 bit addr \t");
if(I2C1_ACKNOWLEDGE_STATUS_BIT)
{
printf("acknowledge stats bit \t");
i2c1_object.i2cErrors++;
I2C1_Stop(I2C1_MESSAGE_ADDRESS_NO_ACK);
}
else
{
// Remove bit 0 as R/W is never sent here
I2C1_TRANSMIT_REG = (i2c_address >> 1) & 0x00FF;
// determine the next state, check R/W
if(i2c_address & 0x01)
{
// if this is a read we must repeat start
// the bus to perform a read
i2c1_state = S_MASTER_10BIT_RESTART;
}
else
{
// this is a write continue writing data
i2c1_state = S_MASTER_SEND_DATA;
}
}
break;
case S_MASTER_10BIT_RESTART:
printf("s master 10 bit restart\t");
if(I2C1_ACKNOWLEDGE_STATUS_BIT)
{
i2c1_object.i2cErrors++;
I2C1_Stop(I2C1_MESSAGE_ADDRESS_NO_ACK);
}
else
{
// ACK Status is good
// restart the bus
I2C1_REPEAT_START_CONDITION_ENABLE_BIT = 1;
// fudge the address so S_MASTER_SEND_ADDR works correctly
// we only do this on a 10-bit address resend
i2c_address = 0x00F0 | ((i2c_address >> 8) & 0x0006);
// set the R/W flag
i2c_address |= 0x0001;
// set the address restart flag so we do not change the address
i2c_10bit_address_restart = 1;
// Resend the address as a read
i2c1_state = S_MASTER_SEND_ADDR;
}
break;
case S_MASTER_SEND_ADDR:
printf("s master send addr \t");
/* Start has been sent, send the address byte */
/* Note:
On a 10-bit address resend (done only during a 10-bit
device read), the original i2c_address was modified in
S_MASTER_10BIT_RESTART state. So the check if this is
a 10-bit address will fail and a normal 7-bit address
is sent with the R/W bit set to read. The flag
i2c_10bit_address_restart prevents the address to
be re-written.
*/
if(i2c_10bit_address_restart != 1)
{
// extract the information for this message
i2c_address = p_i2c1_trb_current->address;
pi2c_buf_ptr = p_i2c1_trb_current->pbuffer;
i2c_bytes_left = p_i2c1_trb_current->length;
}
else
{
// reset the flag so the next access is ok
i2c_10bit_address_restart = 0;
}
// check for 10-bit address
if(i2c_address > 0x00FF)
{
// we have a 10 bit address
// send bits<9:8>
// mask bit 0 as this is always a write
I2C1_TRANSMIT_REG = 0xF0 | ((i2c_address >> 8) & 0x0006);
i2c1_state = S_MASTER_SEND_ADDR_10BIT_LSB;
}
else
{
// Transmit the address
I2C1_TRANSMIT_REG = i2c_address;
if(i2c_address & 0x01)
{
// Next state is to wait for address to be acked
i2c1_state = S_MASTER_ACK_ADDR;
}
else
{
// Next state is transmit
i2c1_state = S_MASTER_SEND_DATA;
}
}
break;
case S_MASTER_SEND_DATA:
printf("s master send data \t");
// Make sure the previous byte was acknowledged
if(I2C1_ACKNOWLEDGE_STATUS_BIT)
{
// Transmission was not acknowledged
i2c1_object.i2cErrors++;
// Reset the Ack flag
I2C1_ACKNOWLEDGE_STATUS_BIT = 0;
// Send a stop flag and go back to idle
I2C1_Stop(I2C1_DATA_NO_ACK);
}
else
{
// Did we send them all ?
if(i2c_bytes_left-- == 0U)
{
// yup sent them all!
// update the trb pointer
p_i2c1_trb_current++;
// are we done with this string of requests?
if(--i2c1_trb_count == 0)
{
I2C1_Stop(I2C1_MESSAGE_COMPLETE);
}
else
{
// no!, there are more TRB to be sent.
//I2C1_START_CONDITION_ENABLE_BIT = 1;
// In some cases, the slave may require
// a restart instead of a start. So use this one
// instead.
I2C1_REPEAT_START_CONDITION_ENABLE_BIT = 1;
// start the i2c request
i2c1_state = S_MASTER_SEND_ADDR;
}
}
else
{
// Grab the next data to transmit
I2C1_TRANSMIT_REG = *pi2c_buf_ptr++;
}
}
break;
case S_MASTER_ACK_ADDR:
printf("s master ack addr \t");
/* Make sure the previous byte was acknowledged */
if(I2C1_ACKNOWLEDGE_STATUS_BIT)
{
// Transmission was not acknowledged
i2c1_object.i2cErrors++;
// Send a stop flag and go back to idle
I2C1_Stop(I2C1_MESSAGE_ADDRESS_NO_ACK);
// Reset the Ack flag
I2C1_ACKNOWLEDGE_STATUS_BIT = 0;
}
else
{
I2C1_RECEIVE_ENABLE_BIT = 1;
i2c1_state = S_MASTER_ACK_RCV_DATA;
}
break;
case S_MASTER_RCV_DATA:
printf("master rcv data \t");
/* Acknowledge is completed. Time for more data */
// Next thing is to ack the data
i2c1_state = S_MASTER_ACK_RCV_DATA;
// Set up to receive a byte of data
I2C1_RECEIVE_ENABLE_BIT = 1;
break;
case S_MASTER_ACK_RCV_DATA:
printf("master ack rcv data \t");
// Grab the byte of data received and acknowledge it
*pi2c_buf_ptr++ = I2C1_RECEIVE_REG;
// Check if we received them all?
if(--i2c_bytes_left)
{
/* No, there's more to receive */
// No, bit 7 is clear. Data is ok
// Set the flag to acknowledge the data
I2C1_ACKNOWLEDGE_DATA_BIT = 0;
// Wait for the acknowledge to complete, then get more
i2c1_state = S_MASTER_RCV_DATA;
}
else
{
// Yes, it's the last byte. Don't ack it
// Flag that we will nak the data
I2C1_ACKNOWLEDGE_DATA_BIT = 1;
I2C1_FunctionComplete();
}
// Initiate the acknowledge
I2C1_ACKNOWLEDGE_ENABLE_BIT = 1;
break;
case S_MASTER_RCV_STOP:
case S_MASTER_SEND_STOP:
printf("send stop \t");
// Send the stop flag
I2C1_Stop(I2C1_MESSAGE_COMPLETE);
break;
default:
printf("not working\t");
// This case should not happen, if it does then
// terminate the transfer
i2c1_object.i2cErrors++;
I2C1_Stop(I2C1_LOST_STATE);
break;
}
}
static void I2C1_FunctionComplete(void)
{
// update the trb pointer
p_i2c1_trb_current++;
// are we done with this string of requests?
if(--i2c1_trb_count == 0)
{
i2c1_state = S_MASTER_SEND_STOP;
}
else
{
i2c1_state = S_MASTER_RESTART;
}
}
static void I2C1_Stop(I2C1_MESSAGE_STATUS completion_code)
{
// then send a stop
I2C1_STOP_CONDITION_ENABLE_BIT = 1;
// make sure the flag pointer is not NULL
if (p_i2c1_current->pTrFlag != NULL)
{
// update the flag with the completion code
*(p_i2c1_current->pTrFlag) = completion_code;
}
// Done, back to idle
i2c1_state = S_MASTER_IDLE;
}
void I2C1_MasterWrite(
uint8_t *pdata,
uint8_t length,
uint16_t address,
I2C1_MESSAGE_STATUS *pstatus)
{
static I2C1_TRANSACTION_REQUEST_BLOCK trBlock;
// check if there is space in the queue
if (i2c1_object.trStatus.s.full != true)
{
printf("there is space\t");
I2C1_MasterWriteTRBBuild(&trBlock, pdata, length, address);
I2C1_MasterTRBInsert(1, &trBlock, pstatus);
}
else
{
printf("failed\t");
*pstatus = I2C1_MESSAGE_FAIL;
}
}
void I2C1_MasterRead(
uint8_t *pdata,
uint8_t length,
uint16_t address,
I2C1_MESSAGE_STATUS *pstatus)
{
static I2C1_TRANSACTION_REQUEST_BLOCK trBlock;
// check if there is space in the queue
if (i2c1_object.trStatus.s.full != true)
{
I2C1_MasterReadTRBBuild(&trBlock, pdata, length, address);
I2C1_MasterTRBInsert(1, &trBlock, pstatus);
}
else
{
*pstatus = I2C1_MESSAGE_FAIL;
}
}
void I2C1_MasterTRBInsert(
uint8_t count,
I2C1_TRANSACTION_REQUEST_BLOCK *ptrb_list,
I2C1_MESSAGE_STATUS *pflag)
{
if (i2c1_object.trStatus.s.full != true)
{
*pflag = I2C1_MESSAGE_PENDING;
i2c1_object.pTrTail->ptrb_list = ptrb_list;
i2c1_object.pTrTail->count = count;
i2c1_object.pTrTail->pTrFlag = pflag;
i2c1_object.pTrTail++;
if (i2c1_object.pTrTail == (i2c1_tr_queue + I2C1_CONFIG_TR_QUEUE_LENGTH))
{
i2c1_object.pTrTail = i2c1_tr_queue;
}
i2c1_object.trStatus.s.empty = false;
if (i2c1_object.pTrHead == i2c1_object.pTrTail)
{
i2c1_object.trStatus.s.full = true;
}
if(i2c1_state == S_MASTER_IDLE)
{
IFS1bits.MI2C1IF = 1;
}
}
else
{
*pflag = I2C1_MESSAGE_FAIL;
}
}
void I2C1_MasterReadTRBBuild(
I2C1_TRANSACTION_REQUEST_BLOCK *ptrb,
uint8_t *pdata,
uint8_t length,
uint16_t address)
{
ptrb->address = address << 1;
// make this a read
ptrb->address |= 0x01;
ptrb->length = length;
ptrb->pbuffer = pdata;
}
void I2C1_MasterWriteTRBBuild(
I2C1_TRANSACTION_REQUEST_BLOCK *ptrb,
uint8_t *pdata,
uint8_t length,
uint16_t address)
{
ptrb->address = address << 1;
ptrb->length = length;
ptrb->pbuffer = pdata;
}
bool I2C1_MasterQueueIsEmpty(void)
{
return((bool)i2c1_object.trStatus.s.empty);
}
bool I2C1_MasterQueueIsFull(void)
{
return((bool)i2c1_object.trStatus.s.full);
}