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In the Adafruit_SPIDevice class, when running on the SAMD architecture in the hardware SPI case, use the SPIClass::transfer(txbuf, rxbuf, count, block) method when writing instead of looping over individual bytes. 

This makes use of DMA and is noticeably faster.
This commit is contained in:
Monroe Williams 2022-01-13 19:18:00 -08:00
parent 69b929d400
commit 7f66a34b9c
1 changed files with 15 additions and 0 deletions
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15
Adafruit_SPIDevice.cpp
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@ -310,6 +310,15 @@ 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)
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++) {
@ -414,6 +423,12 @@ 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)
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++) {