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esp32_Adafruit_BusIO
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In the Adafruit_SPIDevice class, when running on ESP32 in the hardware SPI case, use the SPIClass::transferBytes() method when writing instead of looping over individual bytes. 

This makes use of the hardware fifo buffers and is noticeably faster.
This commit is contained in:
Monroe Williams 2022-01-12 00:33:47 -08:00
parent ea1e1a833c
commit 3bdfee4ab8
1 changed files with 28 additions and 7 deletions
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35
Adafruit_SPIDevice.cpp
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@ -301,11 +301,23 @@ bool Adafruit_SPIDevice::write(uint8_t *buffer, size_t len,
digitalWrite(_cs, LOW);
// do the writing
for (size_t i = 0; i < prefix_len; i++) {
transfer(prefix_buffer[i]);
}
for (size_t i = 0; i < len; i++) {
transfer(buffer[i]);
#if defined(ARDUINO_ARCH_ESP32)
if (_spi) {
if (prefix_len > 0) {
_spi->transferBytes(prefix_buffer, nullptr, prefix_len);
}
if (len > 0) {
_spi->transferBytes(buffer, nullptr, len);
}
} else
#endif
{
for (size_t i = 0; i < prefix_len; i++) {
transfer(prefix_buffer[i]);
}
for (size_t i = 0; i < len; i++) {
transfer(buffer[i]);
}
}
digitalWrite(_cs, HIGH);
@ -396,8 +408,17 @@ bool Adafruit_SPIDevice::write_then_read(uint8_t *write_buffer,
digitalWrite(_cs, LOW);
// do the writing
for (size_t i = 0; i < write_len; i++) {
transfer(write_buffer[i]);
#if defined(ARDUINO_ARCH_ESP32)
if (_spi) {
if (write_len > 0) {
_spi->transferBytes(write_buffer, nullptr, write_len);
}
} else
#endif
{
for (size_t i = 0; i < write_len; i++) {
transfer(write_buffer[i]);
}
}
#ifdef DEBUG_SERIAL