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SPI: Provide byte[] JNI interfaces.

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This avoids a direct byte buffer allocation on every read/write/transaction
for the byte[] variants.

Also change spiGetAccumulatorOutput() to directly set the AccumulatorResult
object, avoiding a ByteBuffer allocation.

Changes HAL SPI interfaces to use const for dataToSend.

Fixes #733.
This commit is contained in:
Peter Johnson
2017-11-14 00:00:45 -08:00
parent df7c1389de
commit 6307d41002
11 changed files with 168 additions and 73 deletions
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5
hal/src/main/native/athena/SPI.cpp
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@@ -260,7 +260,7 @@ void HAL_InitializeSPI(HAL_SPIPort port, int32_t* status) {
* @param size Number of bytes to transfer. [0..7]
* @return Number of bytes transferred, -1 for error
*/
int32_t HAL_TransactionSPI(HAL_SPIPort port, uint8_t* dataToSend,
int32_t HAL_TransactionSPI(HAL_SPIPort port, const uint8_t* dataToSend,
uint8_t* dataReceived, int32_t size) {
if (port < 0 || port >= kSpiMaxHandles) {
return -1;
@@ -286,7 +286,8 @@ int32_t HAL_TransactionSPI(HAL_SPIPort port, uint8_t* dataToSend,
* @param sendSize The number of bytes to be written
* @return The number of bytes written. -1 for an error
*/
int32_t HAL_WriteSPI(HAL_SPIPort port, uint8_t* dataToSend, int32_t sendSize) {
int32_t HAL_WriteSPI(HAL_SPIPort port, const uint8_t* dataToSend,
int32_t sendSize) {
if (port < 0 || port >= kSpiMaxHandles) {
return -1;
}