/******************************************************************************
*
* Description:
* Read from LM75
*
* Params:
* [in] address - device address
* [in] pBuf - buffer for received data
* [in] len - buffer length
*
* Returns:
* I2C status code
*
*****************************************************************************/
tS8 lm75Read(tU8 address, tU8* pBuf, tU16 len) {
tS8 retCode = 0;
tU8 status = 0;
tU16 i = 0;
retCode = eepromStartRead(address, 0);
if (I2C_CODE_OK == retCode) {
/* wait until address transmitted and receive data */
for (i = 1; i <= len; i++) {
/* wait until data transmitted */
while (1) {
/* Get new status */
status = i2cCheckStatus();
if ((0x40 == status) || (0x48 == status) || (0x50 == status)) {
/* Data received */
if (i == len) {
/* Set generate NACK */
retCode = i2cGetChar(I2C_MODE_ACK1, pBuf);
} else {
retCode = i2cGetChar(I2C_MODE_ACK0, pBuf);
}
/* Read data */
retCode = i2cGetChar(I2C_MODE_READ, pBuf);
while (I2C_CODE_EMPTY == retCode) {
retCode = i2cGetChar(I2C_MODE_READ, pBuf);
}
pBuf++;
break;
} else if (0xf8 != status) {
/* ERROR */
i = len;
retCode = I2C_CODE_ERROR;
break;
}
}
}
}
/* Generate Stop condition */
i2cStop();
return retCode;
}
/******************************************************************************
*
* Description:
* Read a specified number of bytes from the I2C network.
*
* Note: After this function is run, you may need a bus free time before a
* new data transfer can be initiated.
*
* Params:
* [in] addr - address
* [in] pBuf - receive buffer
* [in] len - number of bytes to receive
*
* Returns:
* I2C_CODE_OK or I2C status code
*
*****************************************************************************/
tS8
i2cRead(tU8 addr,
tU8 *pBuf,
tU16 len) {
tS8 retCode = 0;
tU8 status = 0;
tU8 i = 0;
/* Generate Start condition */
retCode = i2cStart();
/* Transmit address */
if (retCode == I2C_CODE_OK) {
/* write SLA+R */
retCode = i2cPutChar(addr);
while (retCode == I2C_CODE_BUSY) {
retCode = i2cPutChar(addr);
}
}
if (retCode == I2C_CODE_OK) {
/* wait until address transmitted and receive data */
for (i = 1; i <= len; i++) {
/* wait until data transmitted */
while (1) {
/* get new status */
status = i2cCheckStatus();
/*
* SLA+R transmitted, ACK received or
* SLA+R transmitted, ACK not received
* data byte received in master mode, ACK transmitted
*/
if ((status == 0x40) || (status == 0x48) || (status == 0x50)) {
/* data received */
if (i == len) {
/* Set generate NACK */
retCode = i2cGetChar(I2C_MODE_ACK1, pBuf);
}
else {
retCode = i2cGetChar(I2C_MODE_ACK0, pBuf);
}
/* Read data */
retCode = i2cGetChar(I2C_MODE_READ, pBuf);
while (retCode == I2C_CODE_EMPTY) {
retCode = i2cGetChar(I2C_MODE_READ, pBuf);
}
pBuf++;
break;
}
/* no relevant status information */
else if (status != 0xf8) {
/* error */
i = len;
retCode = I2C_CODE_ERROR;
break;
}
}
}
}
/*--- Generate Stop condition ---*/
i2cStop();
return retCode;
}
/******************************************************************************
*
* Description:
* Communicate with PCA9532
*
* Params:
* [in] pBuf - buffer of bytes to write
* [in] len - length of pBuf
* [in] pBuf2 - buffer for received data
* [in] len - length of pBuf2
*
* Returns:
* I2C status code
*
*****************************************************************************/
tS8 pca9532(tU8* pBuf, tU16 len, tU8* pBuf2, tU16 len2) {
tS8 retCode = 0;
tU8 status = 0;
tU16 i = 0;
do {
/* generate Start condition */
retCode = i2cStart();
if (I2C_CODE_OK != retCode) {
break;
}
/* write pca9532 address */
retCode = i2cWriteWithWait(0xc0);
if (I2C_CODE_OK != retCode) {
break;
}
/* write data */
for (i = 0; i < len; i++) {
retCode = i2cWriteWithWait(*pBuf);
if (I2C_CODE_OK != retCode) {
break;
}
pBuf++;
}
} while (0);
if (len2 > 0) {
/* Generate Start condition */
retCode = i2cRepeatStart();
/* Transmit device address */
if (I2C_CODE_OK == retCode) {
/* Write SLA+R */
retCode = i2cPutChar(0xc0 + 0x01);
while (I2C_CODE_BUSY == retCode) {
retCode = i2cPutChar(0xc0 + 0x01);
}
}
/* Wait until SLA+R transmitted */
while (1) {
/* Get new status */
status = i2cCheckStatus();
if (0x40 == status) {
/* Data transmitted and ACK received */
break;
} else if (0xf8 != status) {
/* error */
retCode = I2C_CODE_ERROR;
break;
}
}
if (I2C_CODE_OK == retCode) {
/* wait until address transmitted and receive data */
for (i = 1; i <= len2; i++) {
/* wait until data transmitted */
while (1) {
/* Get new status */
status = i2cCheckStatus();
if ((0x40 == status) || (0x48 == status) || (0x50 == status)) {
/* Data received */
if (i == len2) {
/* Set generate NACK */
retCode = i2cGetChar(I2C_MODE_ACK1, pBuf2);
} else {
retCode = i2cGetChar(I2C_MODE_ACK0, pBuf2);
}
/* Read data */
retCode = i2cGetChar(I2C_MODE_READ, pBuf2);
while (I2C_CODE_EMPTY == retCode) {
retCode = i2cGetChar(I2C_MODE_READ, pBuf2);
}
pBuf2++;
break;
} else if (0xf8 != status) {
/* ERROR */
i = len2;
retCode = I2C_CODE_ERROR;
break;
}
}
}
}
}
/* Generate Stop condition */
i2cStop();
return retCode;
}