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Merge pull request #77 from monroewilliams/master 

Faster hardware SPI writes on SAMD
This commit is contained in:
Limor "Ladyada" Fried 2022-02-02 16:23:57 -05:00 committed by GitHub
parent 92b460c3f4 5efa09dbe7
commit 512fde07b5
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1 changed files with 29 additions and 0 deletions
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29
Adafruit_SPIDevice.cpp
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@ -312,6 +312,22 @@ bool Adafruit_SPIDevice::write(uint8_t *buffer, size_t len,
_spi->transferBytes(buffer, nullptr, len); _spi->transferBytes(buffer, nullptr, len);
} }
} else } else
#elif defined(ARDUINO_ARCH_SAMD) && defined(_ADAFRUIT_ZERODMA_H_)
// The variant of transfer() used below currently only exists in the Adafruit
// core. It causes a build failure when building against the main Arduino SAMD
// core. Unfortunately there doesn't seem to be a supported #define that this
// code can use to tell which core it's building against. This hack (checking
// for the include guard that gets defined when the Adafruit core's SPI.h
// includes Adafruit_ZeroDMA.h) works for now, but it should be improved when
// possible.
if (_spi) {
if (prefix_len > 0) {
_spi->transfer(prefix_buffer, nullptr, prefix_len);
}
if (len > 0) {
_spi->transfer(buffer, nullptr, len);
}
} else
#endif #endif
{ {
for (size_t i = 0; i < prefix_len; i++) { for (size_t i = 0; i < prefix_len; i++) {
@ -417,6 +433,19 @@ bool Adafruit_SPIDevice::write_then_read(uint8_t *write_buffer,
_spi->transferBytes(write_buffer, nullptr, write_len); _spi->transferBytes(write_buffer, nullptr, write_len);
} }
} else } else
#elif defined(ARDUINO_ARCH_SAMD) && defined(_ADAFRUIT_ZERODMA_H_)
// The variant of transfer() used below currently only exists in the Adafruit
// core. It causes a build failure when building against the main Arduino SAMD
// core. Unfortunately there doesn't seem to be a supported #define that this
// code can use to tell which core it's building against. This hack (checking
// for the include guard that gets defined when the Adafruit core's SPI.h
// includes Adafruit_ZeroDMA.h) works for now, but it should be improved when
// possible.
if (_spi) {
if (write_len > 0) {
_spi->transfer(write_buffer, nullptr, write_len);
}
} else
#endif #endif
{ {
for (size_t i = 0; i < write_len; i++) { for (size_t i = 0; i < write_len; i++) {