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A fix contributed by James Ward to fix the restriction on the read/write sizes in I2C.

Change-Id: Iddc48dc55ff9cea37d8dcfaba5e63f0d14e4c7d0
This commit is contained in:
jmanning
2015-07-09 15:36:02 -04:00
committed by Brad Miller (WPI)
parent 3635299fde
commit c21c47f546
3 changed files with 38 additions and 76 deletions
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37
wpilibj/wpilibJavaDevices/src/main/java/edu/wpi/first/wpilibj/I2C.java
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@@ -72,9 +72,9 @@ public class I2C extends SensorBase {
* over each transaction.
*
* @param dataToSend Buffer of data to send as part of the transaction.
* @param sendSize Number of bytes to send as part of the transaction. [0..6]
* @param sendSize Number of bytes to send as part of the transaction.
* @param dataReceived Buffer to read data into.
* @param receiveSize Number of bytes to read from the device. [0..7]
* @param receiveSize Number of bytes to read from the device.
* @return Transfer Aborted... false for success, true for aborted.
*/
public synchronized boolean transaction(byte[] dataToSend, int sendSize, byte[] dataReceived,
@@ -88,15 +88,6 @@ public class I2C extends SensorBase {
aborted =
I2CJNI.i2CTransaction((byte) m_port.getValue(), (byte) m_deviceAddress, dataToSendBuffer,
(byte) sendSize, dataReceivedBuffer, (byte) receiveSize) != 0;
/*
* if (status.get() == HALUtil.PARAMETER_OUT_OF_RANGE) { if (sendSize > 6) {
* throw new BoundaryException(BoundaryException.getMessage( sendSize, 0,
* 6)); } else if (receiveSize > 7) { throw new
* BoundaryException(BoundaryException.getMessage( receiveSize, 0, 7)); }
* else { throw new RuntimeException(
* HALLibrary.PARAMETER_OUT_OF_RANGE_MESSAGE); } }
* HALUtil.checkStatus(status);
*/
if (receiveSize > 0 && dataReceived != null) {
dataReceivedBuffer.get(dataReceived);
}
@@ -156,18 +147,22 @@ public class I2C extends SensorBase {
/**
* Execute a read transaction with the device.
*
* Read 1 to 7 bytes from a device. Most I2C devices will auto-increment the
* register pointer internally allowing you to read up to 7 consecutive
* Read bytes from a device. Most I2C devices will auto-increment the
* register pointer internally allowing you to read consecutive
* registers on a device in a single transaction.
*
* @param registerAddress The register to read first in the transaction.
* @param count The number of bytes to read in the transaction. [1..7]
* @param count The number of bytes to read in the transaction.
* @param buffer A pointer to the array of bytes to store the data read from
* the device.
* @return Transfer Aborted... false for success, true for aborted.
*/
public boolean read(int registerAddress, int count, byte[] buffer) {
BoundaryException.assertWithinBounds(count, 1, 7);
if (count < 1) {
throw new BoundaryException("Value must be at least 1, " + count +
" given");
}
if (buffer == null) {
throw new NullPointerException("Null return buffer was given");
}
@@ -180,16 +175,20 @@ public class I2C extends SensorBase {
/**
* Execute a read only transaction with the device.
*
* Read 1 to 7 bytes from a device. This method does not write any data to
* prompt the device.
* Read bytes from a device. This method does not write any data to prompt
* the device.
*
* @param buffer A pointer to the array of bytes to store the data read from
* the device.
* @param count The number of bytes to read in the transaction. [1..7]
* @param count The number of bytes to read in the transaction.
* @return Transfer Aborted... false for success, true for aborted.
*/
public boolean readOnly(byte[] buffer, int count) {
BoundaryException.assertWithinBounds(count, 1, 7);
if (count < 1) {
throw new BoundaryException("Value must be at least 1, " + count +
" given");
}
if (buffer == null) {
throw new NullPointerException("Null return buffer was given");
}