playground-stm32/neopixel_f103_mvp
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Alternating buffers for DMA (works only with optimization)

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This commit is contained in:
Attila Body 2020-12-01 14:35:47 +01:00
parent fe332dea5d
commit 731bba0f0e
8 changed files with 106 additions and 40 deletions
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94
App/App.cpp
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@ -21,8 +21,15 @@
Sparkle g_sparkles[NUMSPARKLES];
volatile uint8_t g_spi_idle = 0;
uint16_t g_pixels_transmitted;
volatile uint8_t g_buffer_in_transmit;
volatile bool g_need_refill;
uint32_t g_refills = 0;
uint16_t g_pixels_converted = 0;
volatile uint32_t g_tick = 0;
volatile uint32_t g_tick = 0;
#define MIN(a,b) ((a) < (b) ? (a) : (b))
void convert(uint8_t *src, uint8_t *dst, uint16_t size)
{
@ -51,7 +58,7 @@ uint16_t ChoosePixel()
do {
chosen = rr(NUMPIXELS);
for(spi=0; spi<NUMSPARKLES; ++spi) {
if(static_cast<Pixel_t*>(g_sparkles[spi]) && static_cast<Pixel_t*>(g_sparkles[spi]) == &g_pixels[chosen])
if(static_cast<pixel_t*>(g_sparkles[spi]) && static_cast<pixel_t*>(g_sparkles[spi]) == &g_pixels[chosen])
break;
}
} while(spi < NUMSPARKLES);
@ -63,7 +70,7 @@ uint16_t ChoosePixel()
void StartSparkle( Sparkle &s )
{
s.Start(g_pixels+ChoosePixel(), Pixel(255,255,255), Pixel(rr(8)+3,rr(8)+3,rr(8)+3));
s.Start(g_pixels+ChoosePixel(), rr(32), Pixel(255,255,255), Pixel(rr(8)+3,rr(8)+3,rr(8)+3));
}
extern "C" void HandleSystick()
@ -78,54 +85,97 @@ extern "C" uint32_t GetTick()
extern "C" void HandleSpiDmaIrq()
{
if(LL_DMA_IsActiveFlag_TC3(DMA1)) {
static bool endframe;
if(LL_DMA_IsActiveFlag_TC3(DMA1))
{
LL_DMA_ClearFlag_TC3(DMA1);
g_spi_idle = true;
LL_SPI_DisableDMAReq_TX(SPI1);
LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_3);
} else if(LL_DMA_IsActiveFlag_TE3(DMA1))
g_buffer_in_transmit ^= 1;
g_pixels_transmitted += SPIBUFFER_PIXELS;
if(g_pixels_transmitted < NUMPIXELS)
{
LL_DMA_SetMemoryAddress(DMA1, LL_DMA_CHANNEL_3, (uint32_t)g_spibuffer[g_buffer_in_transmit]);
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, SPIBUFFER_SIZE);
LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_3);
if(g_pixels_converted < NUMPIXELS)
{
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
convert((uint8_t*)&g_pixels[g_pixels_converted],
g_spibuffer[g_buffer_in_transmit ^ 1],
MIN(SPIBUFFER_PIXELS, NUMPIXELS - g_pixels_converted) * sizeof(pixel_t));
g_pixels_converted += MIN(SPIBUFFER_PIXELS, NUMPIXELS - g_pixels_converted);
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
endframe = false;
}
else
{
memset(g_spibuffer[g_buffer_in_transmit ^1], 0, sizeof(g_spibuffer[g_buffer_in_transmit ^1]));
endframe = true;
}
}
else if(endframe)
{
LL_DMA_SetMemoryAddress(DMA1, LL_DMA_CHANNEL_3, (uint32_t)g_spibuffer[g_buffer_in_transmit]);
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, SPIBUFFER_SIZE);
LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_3);
endframe = false;
}
else {
g_spi_idle = true;
}
}
else if(LL_DMA_IsActiveFlag_TE3(DMA1))
LL_DMA_ClearFlag_TE3(DMA1);
}
extern "C" void App()
{
g_spibuffer[sizeof(g_spibuffer)-1] = 0;
uint32_t lastTick = GetTick();
for(uint16_t px = 0; px < NUMPIXELS; ++px)
g_pixels[px] = Pixel( DEFAULT_COLOR );
uint32_t lastTick = GetTick();
g_pixels[px] = Pixel(DEFAULT_COLOR);
LL_SYSTICK_EnableIT();
LL_SPI_Enable(SPI1);
LL_SPI_EnableDMAReq_TX(SPI1);
while(1)
{
while(GetTick() - lastTick < FRAMETIME );
lastTick += FRAMETIME;
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
for(int16_t spi = 0; spi < NUMSPARKLES; ++spi) {
if(static_cast<Pixel_t*>(g_sparkles[spi]))
if(static_cast<pixel_t*>(g_sparkles[spi]))
g_sparkles[spi].Step();
else
StartSparkle(g_sparkles[spi]);
}
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
convert((uint8_t*)g_pixels, g_spibuffer, sizeof(g_pixels));
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
g_pixels_converted = 0;
g_pixels_transmitted = 0;
g_need_refill = true;
g_spi_idle = false;
// HAL_SPI_Transmit_DMA(&hspi1, g_ledBits, sizeof(g_ledBits));
LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_3, (uint32_t)g_spibuffer, LL_SPI_DMA_GetRegAddr(SPI1), LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, sizeof(g_spibuffer));
convert((uint8_t*)g_pixels, g_spibuffer[0], SPIBUFFER_PIXELS * sizeof(pixel_t));
g_pixels_converted += SPIBUFFER_PIXELS;
convert((uint8_t*)&g_pixels[g_pixels_converted], g_spibuffer[1], SPIBUFFER_PIXELS * sizeof(pixel_t));
g_pixels_converted += SPIBUFFER_PIXELS;
g_buffer_in_transmit = 0;
LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_3, (uint32_t)g_spibuffer[0], LL_SPI_DMA_GetRegAddr(SPI1), LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, SPIBUFFER_SIZE);
LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_3);
LL_SPI_EnableDMAReq_TX(SPI1);
LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_3);
LL_DMA_EnableIT_TE(DMA1, LL_DMA_CHANNEL_3);
g_spi_idle = false;
while(!g_spi_idle);
LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_13);
}
}