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better use nrf spi with dma for drawing pixels with nrf52840 (#248)

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* better use nrf spi with dma

* only use spim dma API with 52840
This commit is contained in:
hathach 2019-10-18 01:22:54 +07:00 committed by Limor "Ladyada" Fried
parent 4e1e209b75
commit c4e7aea568
1 changed files with 43 additions and 0 deletions
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43
Adafruit_SPITFT.cpp
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@ -984,6 +984,25 @@ void Adafruit_SPITFT::writePixels(uint16_t *colors, uint32_t len,
hwspi._spi->writePixels(colors, len * 2);
return;
}
#elif defined(ARDUINO_NRF52_ADAFRUIT) && defined(NRF52840_XXAA)// Adafruit nRF52 use SPIM3 DMA at 32Mhz
// TFT and SPI DMA endian is different we need to swap bytes
if (!bigEndian) {
for(uint32_t i=0; i<len; i++) {
colors[i] = __builtin_bswap16(colors[i]);
}
}
// use the separate tx, rx buf variant to prevent overwrite the buffer
hwspi._spi->transfer(colors, NULL, 2*len);
// swap back color buffer
if (!bigEndian) {
for(uint32_t i=0; i<len; i++) {
colors[i] = __builtin_bswap16(colors[i]);
}
}
return;
#elif defined(USE_SPI_DMA)
if((connection == TFT_HARD_SPI) || (connection == TFT_PARALLEL)) {
int maxSpan = maxFillLen / 2; // One scanline max
@ -1131,6 +1150,30 @@ void Adafruit_SPITFT::writeColor(uint16_t color, uint32_t len) {
}
return;
}
#elif defined(ARDUINO_NRF52_ADAFRUIT) && defined(NRF52840_XXAA) // Adafruit nRF52840 use SPIM3 DMA at 32Mhz
// at most 2 scan lines
uint32_t const pixbufcount = min(len, ((uint32_t) 2*width()));
uint16_t* pixbuf = (uint16_t*) rtos_malloc(2*pixbufcount);
// use SPI3 DMA if we could allocate buffer, else fall back to writing each pixel loop below
if (pixbuf)
{
uint16_t const swap_color = __builtin_bswap16(color);
// fill buffer with color
for(uint32_t i=0; i<pixbufcount; i++) {
pixbuf[i] = swap_color;
}
while(len) {
uint32_t const count = min(len, pixbufcount);
writePixels(pixbuf, count, true, true);
len -= count;
}
rtos_free(pixbuf);
return;
}
#else // !ESP32
#if defined(USE_SPI_DMA)
if(((connection == TFT_HARD_SPI) || (connection == TFT_PARALLEL)) &&