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Added double buffering (untested)

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This commit is contained in:
jaseg 2013-12-17 12:35:28 +01:00
parent 0410b967b5
commit cc9378fe4f
1 changed files with 14 additions and 6 deletions
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20
firmware/main.c
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@ -67,7 +67,10 @@ unsigned const char const CRATE_MAP[CRATES_PER_BUS] = {
#define SYSTICKS_PER_SECOND 100
#define SYSTICK_PERIOD_MS (1000 / SYSTICKS_PER_SECOND)
unsigned char framebuffer[BUS_COUNT*BUS_SIZE];
unsigned char framebuffer1[BUS_COUNT*BUS_SIZE];
unsigned char framebuffer2[BUS_COUNT*BUS_SIZE];
unsigned char *framebuffer_input = framebuffer1;
unsigned char *framebuffer_output = framebuffer2;
unsigned long framebuffer_read(void *data, unsigned long len);
/* Kick off DMA transfer from RAM to SPI interfaces */
void kickoff_transfers(void);
@ -167,10 +170,10 @@ unsigned long framebuffer_read(void *data, unsigned long len) {
unsigned int bottle = BOTTLE_MAP[x + y*CRATE_WIDTH];
unsigned int dst = bus*BUS_SIZE + (crate*CRATE_SIZE + bottle)*3;
unsigned int src = (y*CRATE_WIDTH + x)*3;
// Copy r, g and b data
framebuffer[dst] = fb->rgb_data[src];
framebuffer[dst + 1] = fb->rgb_data[src + 1];
framebuffer[dst + 2] = fb->rgb_data[src + 2];
/* Copy r, g and b data */
framebuffer_input[dst] = fb->rgb_data[src];
framebuffer_input[dst + 1] = fb->rgb_data[src + 1];
framebuffer_input[dst + 2] = fb->rgb_data[src + 2];
}
}
@ -180,6 +183,11 @@ unsigned long framebuffer_read(void *data, unsigned long len) {
}
void kickoff_transfers() {
/* Swap buffers */
unsigned char *tmp = framebuffer_output;
framebuffer_output = framebuffer_input;
framebuffer_input = tmp;
/* Re-schedule DMA transfers */
kickoff_transfer(11, 0, SSI0_BASE);
kickoff_transfer(25, 1, SSI1_BASE);
kickoff_transfer(13, 2, SSI2_BASE);
@ -187,7 +195,7 @@ void kickoff_transfers() {
}
void kickoff_transfer(unsigned int channel, unsigned int offset, int base) {
ROM_uDMAChannelTransferSet(channel | UDMA_PRI_SELECT, UDMA_MODE_BASIC, framebuffer+BUS_SIZE*offset, (void *)(base + SSI_O_DR), BUS_SIZE);
ROM_uDMAChannelTransferSet(channel | UDMA_PRI_SELECT, UDMA_MODE_BASIC, framebuffer_output+BUS_SIZE*offset, (void *)(base + SSI_O_DR), BUS_SIZE);
ROM_uDMAChannelEnable(channel);
}