* len is the length of data to send or receive
* buffer is the address of the data buffer
* stop = I2C_NO_STOP, don't signal STOP at end of transaction
- * I2C_STOP, signal STOP at end of transaction
+ * I2C_STOP, signal STOP at end of transaction
* retry is the timeout retry value, currently ignored
* rsta = I2C_NO_RESTART, this is not continuation of existing transaction
- * I2C_RESTART, this is a continuation of existing transaction
+ * I2C_RESTART, this is a continuation of existing transaction
*/
I2C_Status I2C_do_transaction ( I2C_INTERRUPT_MODE en_int,
I2C_TRANSACTION_MODE act,
}
/*
- * We first have to contact the slave device and transmit the
- * data address. Be careful about the STOP and restart stuff.
- * We don't want to signal STOP after sending the data
- * address, but this could be a continuation if the
- * application didn't release the bus after the previous
- * transaction, by not sending a STOP after it.
+ * We first have to contact the slave device and transmit the
+ * data address. Be careful about the STOP and restart stuff.
+ * We don't want to signal STOP after sending the data
+ * address, but this could be a continuation if the
+ * application didn't release the bus after the previous
+ * transaction, by not sending a STOP after it.
*/
status = I2C_do_buffer (en_int, I2C_MASTER_XMIT, i2c_addr, 1,
data_addr_buffer, I2C_NO_STOP, retry, rsta);
* len is the length of data to send or receive
* buffer is the address of the data buffer
* stop = I2C_NO_STOP, don't signal STOP at end of transaction
- * I2C_STOP, signal STOP at end of transaction
+ * I2C_STOP, signal STOP at end of transaction
* retry is the timeout retry value, currently ignored
* rsta = I2C_NO_RESTART, this is not continuation of existing transaction
- * I2C_RESTART, this is a continuation of existing transaction
+ * I2C_RESTART, this is a continuation of existing transaction
*/
static I2C_Status I2C_do_buffer (I2C_INTERRUPT_MODE en_int,
I2C_TRANSACTION_MODE act,
* function: I2C_Start
*
* description: Generate a START signal in the desired mode.
- * I2C is the master.
+ * I2C is the master.
*
- * Return I2CSUCCESS if no error.
+ * Return I2CSUCCESS if no error.
*
* note:
****************************************************/
* function: I2c_Stop
*
* description: Generate a STOP signal to terminate the master
- * transaction.
- * return I2CSUCCESS
+ * transaction.
+ * return I2CSUCCESS
*
**********************************************************/
static I2CStatus I2C_Stop (unsigned int eumbbar)
* function: I2C_Master_Xmit
*
* description: Master sends one byte of data to
- * slave target
+ * slave target
*
- * return I2CSUCCESS if the byte transmitted.
- * Otherwise no-zero
+ * return I2CSUCCESS if the byte transmitted.
+ * Otherwise no-zero
*
* Note: condition must meet when this function is called:
* I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && I2CSR(RXAK) == 0
* function: I2C_Master_Rcv
*
* description: master reads one byte data
- * from slave source
+ * from slave source
*
- * return I2CSUCCESS if no error
+ * return I2CSUCCESS if no error
*
* Note: condition must meet when this function is called:
* I2CSR(MIF) == 1 && I2CSR(MCF) == 1 &&
* function: I2C_Slave_Xmit
*
* description: Slave sends one byte of data to
- * requesting destination
+ * requesting destination
*
- * return SUCCESS if the byte transmitted. Otherwise
- * No-zero
+ * return SUCCESS if the byte transmitted. Otherwise
+ * No-zero
*
* Note: condition must meet when this function is called:
* I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && I2CSR(RXAK) = 0
ByteToXmit = 0;
/*
- * do not toggle I2CCR(MTX). Doing so will
- * cause bus-hung since current Kahlua design
- * does not give master a way to detect slave
- * stop. It is always a good idea for master
- * to use timer to prevent the long long
- * delays
+ * do not toggle I2CCR(MTX). Doing so will
+ * cause bus-hung since current Kahlua design
+ * does not give master a way to detect slave
+ * stop. It is always a good idea for master
+ * to use timer to prevent the long long
+ * delays
*/
return I2CBUFFEMPTY;
* function: I2C_Slave_Rcv
*
* description: slave reads one byte data
- * from master source
+ * from master source
*
- * return I2CSUCCESS if no error otherwise non-zero
+ * return I2CSUCCESS if no error otherwise non-zero
*
* Note: condition must meet when this function is called:
* I2CSR(MIF) == 1 && I2CSR(MCF) == 1 &&
* function: I2C_Init
*
* description: Initialize I2C unit with desired frequency divider,
- * master's listening address, with interrupt enabled
- * or disabled.
+ * master's listening address, with interrupt enabled
+ * or disabled.
*
* note:
********************************************************/
* function: I2c_Set_Ctrl
*
* description: Change I2C Control bits,
- * i.e., write to I2CCR
+ * i.e., write to I2CCR
*
********************************************/
static void I2C_Set_Ctrl (unsigned int eumbbar, I2C_CTRL ctrl)
* function: I2C_Get_Ctrl
*
* description: Query I2C Control bits,
- * i.e., read I2CCR
+ * i.e., read I2CCR
*****************************************/
static I2C_CTRL I2C_Get_Ctrl (unsigned int eumbbar)
{
* function: I2C_Slave_Addr
*
* description: Process slave address phase.
- * return I2CSUCCESS if no error
+ * return I2CSUCCESS if no error
*
* note: Precondition for calling this function:
* I2CSR(MIF) == 1 &&
int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
{
I2CStatus status;
- unsigned char dummy_buffer[I2C_RXTX_LEN + 2];
+ uchar dummy_buffer[I2C_RXTX_LEN + 2];
+ uchar *p;
int i;
- dummy_buffer[0] = addr & 0xFF;
- if (alen == 2)
- dummy_buffer[1] = (addr >> 8) & 0xFF;
- for (i = 0; i < len; i++)
- dummy_buffer[i + alen] = buffer[i];
+ p = dummy_buffer;
+ /* fill in address in big endian order */
+ for (i=0; i<alen; ++i)
+ *p++ = (addr >> (i * 8)) & 0xFF;
+ /* fill in data */
+ for (i=0; i<len; ++i)
+ *p++ = *buffer;
status = I2C_do_buffer (0, I2C_MASTER_XMIT, chip, alen + len,
dummy_buffer, I2C_STOP, 1, I2C_NO_RESTART);
projects / u-boot / blobdiff