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Parallel DMA working on PyPortal

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This commit is contained in:
Phillip Burgess 2019-03-14 22:09:42 -07:00
parent cadfd0a233
commit 6704269c77
2 changed files with 46 additions and 21 deletions
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37
Adafruit_SPITFT.cpp
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@ -673,6 +673,26 @@ void Adafruit_SPITFT::initSPI(uint32_t freq) {
dma.setTrigger(dmac_id);
dma.setAction(DMA_TRIGGER_ACTON_BEAT);
// Initialize descriptor list.
for(int d=0; d<numDescriptors; d++) {
// No need to set SRCADDR, DESCADDR or BTCNT --
// those are done in the pixel-writing functions.
descriptor[d].BTCTRL.bit.VALID = true;
descriptor[d].BTCTRL.bit.EVOSEL =
DMA_EVENT_OUTPUT_DISABLE;
descriptor[d].BTCTRL.bit.BLOCKACT =
DMA_BLOCK_ACTION_NOACT;
descriptor[d].BTCTRL.bit.BEATSIZE =
DMA_BEAT_SIZE_BYTE;
descriptor[d].BTCTRL.bit.DSTINC = 0;
descriptor[d].BTCTRL.bit.STEPSEL =
DMA_STEPSEL_SRC;
descriptor[d].BTCTRL.bit.STEPSIZE =
DMA_ADDRESS_INCREMENT_STEP_SIZE_1;
descriptor[d].DSTADDR.reg =
(uint32_t)data_reg;
}
} else { // Parallel connection
int dmaChannel = dma.getChannel();
@ -748,6 +768,7 @@ void Adafruit_SPITFT::initSPI(uint32_t freq) {
// Wait for it, then enable EVSYS clock
while(!GCLK->PCHCTRL[EVSYS_GCLK_ID_0].bit.CHEN);
MCLK->APBBMASK.bit.EVSYS_ = 1;
// Connect Timer EVU to ch 0
EVSYS->USER[tcList[tcNum].evu].reg = 1;
// Datasheet recommends single write operation;
@ -758,27 +779,29 @@ void Adafruit_SPITFT::initSPI(uint32_t freq) {
ev.bit.PATH = 2; // Asynchronous
ev.bit.EVGEN = 0x22 + dmaChannel; // DMA channel 0+
EVSYS->Channel[0].CHANNEL.reg = ev.reg;
} // end parallel-specific DMA setup
// Initialize descriptor list.
for(int d=0; d<numDescriptors; d++) {
// No need to set SRCADDR, DESCADDR or BTCNT --
// those are done in the pixel-writing functions.
descriptor[d].BTCTRL.bit.VALID = true;
descriptor[d].BTCTRL.bit.EVOSEL =
DMA_EVENT_OUTPUT_DISABLE;
// Event strobe on beat xfer:
descriptor[d].BTCTRL.bit.EVOSEL = 0x3;
descriptor[d].BTCTRL.bit.BLOCKACT =
DMA_BLOCK_ACTION_NOACT;
descriptor[d].BTCTRL.bit.BEATSIZE =
DMA_BEAT_SIZE_BYTE;
descriptor[d].BTCTRL.bit.BEATSIZE = tft8.wide ?
DMA_BEAT_SIZE_HWORD : DMA_BEAT_SIZE_BYTE;
descriptor[d].BTCTRL.bit.SRCINC = 1;
descriptor[d].BTCTRL.bit.DSTINC = 0;
descriptor[d].BTCTRL.bit.STEPSEL =
DMA_STEPSEL_SRC;
descriptor[d].BTCTRL.bit.STEPSIZE =
DMA_ADDRESS_INCREMENT_STEP_SIZE_1;
descriptor[d].DSTADDR.reg =
(uint32_t)data_reg;
(uint32_t)tft8.writePort;
}
} // end parallel-specific DMA setup
lastFillColor = 0x0000;
lastFillLen = 0;
dma.setCallback(dma_callback);
@ -892,6 +915,7 @@ void Adafruit_SPITFT::writePixels(uint16_t *colors, uint32_t len) {
memcpy(dptr, &descriptor[pixelBufIdx], sizeof(DmacDescriptor));
dma_busy = true;
dma.startJob(); // Trigger SPI DMA transfer
if(connection == TFT_PARALLEL) dma.trigger();
pixelBufIdx = 1 - pixelBufIdx; // Swap DMA pixel buffers
len -= count;
@ -1022,6 +1046,7 @@ void Adafruit_SPITFT::writeColor(uint16_t color, uint32_t len) {
dma_busy = true;
dma.startJob();
if(connection == TFT_PARALLEL) dma.trigger();
while(dma_busy); // Wait for completion
// Unfortunately blocking is necessary. An earlier version returned
// immediately and checked dma_busy on startWrite() instead, but it

2
library.properties
View File

@ -1,5 +1,5 @@
name=Adafruit GFX Library
version=1.4.2
version=1.4.3
author=Adafruit
maintainer=Adafruit <info@adafruit.com>
sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from.