diff options
Diffstat (limited to 'firmware/main.c')
| -rw-r--r-- | firmware/main.c | 89 |
1 files changed, 46 insertions, 43 deletions
diff --git a/firmware/main.c b/firmware/main.c index 3c8e000..4419435 100644 --- a/firmware/main.c +++ b/firmware/main.c @@ -103,21 +103,6 @@ void SysTickIntHandler(void) { g_ulSysTickCount++;
}
-/* Will be called when a DMA transfer is complete */
-void SSI0IntHandler(void) {
- /* FIXME is this necessary? */
- unsigned long ssistatus = SSIIntStatus(SSI0_BASE, 1);
- MAP_SSIIntClear(SSI0_BASE, ssistatus);
-
- if(!MAP_uDMAChannelIsEnabled(11)){
- /* A TX DMA transfer was completed */
- /* FIXME actually, just set a flag here and kick off when all four controllers signal completion.*/
- /* Wait 1.2ms for the WS2801s to latch (the datasheet specifies at least 500µs) */
- MAP_SysCtlDelay(20000);
- kickoff_transfers();
- }
-}
-
unsigned long RxHandler(void *pvCBData, unsigned long ulEvent, unsigned long ulMsgValue, void *pvMsgData) {
switch(ulEvent) {
case USB_EVENT_CONNECTED:
@@ -142,48 +127,68 @@ unsigned long RxHandler(void *pvCBData, unsigned long ulEvent, unsigned long ulM }
typedef struct {
+ unsigned char command; /* 0x00 for frame data, 0x01 to initiate latch */
unsigned char crate_x;
unsigned char crate_y;
unsigned char rgb_data[CRATE_SIZE*BYTES_PER_PIXEL];
} FramebufferData;
unsigned long framebuffer_read(void *data, unsigned long len) {
- if(len != sizeof(FramebufferData))
- return len;
+ if(len < 1)
+ goto length_error;
UARTprintf("Rearranging data.\n");
FramebufferData *fb = (FramebufferData *)data;
+ if(fb->command == 1){
+ if(len != 1)
+ goto length_error;
+ UARTprintf("Starting DMA.\n");
+ kickoff_transfers();
+ }else{
+ if(len != sizeof(FramebufferData))
+ goto length_error;
- unsigned int bus = fb->crate_x/CRATES_X;
- fb->crate_x %= CRATES_X;
+ unsigned int bus = fb->crate_x/CRATES_X;
+ fb->crate_x %= CRATES_X;
- if(bus > BUS_COUNT || fb->crate_y > CRATES_Y){
- UARTprintf("Invalid frame index\n");
- return len;
- }
+ if(bus > BUS_COUNT || fb->crate_y > CRATES_Y){
+ UARTprintf("Invalid frame index\n");
+ return len;
+ }
- /* Mirror crate map for the display's right half */
- if(bus >= BUS_COUNT/2)
- fb->crate_x = CRATES_X - fb->crate_x - 1;
-
- unsigned int crate = CRATE_MAP[fb->crate_x + fb->crate_y*CRATES_X];
- for(unsigned int x=0; x<CRATE_WIDTH; x++){
- for(unsigned int y=0; y<CRATE_HEIGHT; y++){
- 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_input[dst] = fb->rgb_data[src];
- framebuffer_input[dst + 1] = fb->rgb_data[src + 1];
- framebuffer_input[dst + 2] = fb->rgb_data[src + 2];
+ /* Mirror crate map for the display's right half */
+ if(bus >= BUS_COUNT/2)
+ fb->crate_x = CRATES_X - fb->crate_x - 1;
+
+ unsigned int crate = CRATE_MAP[fb->crate_x + fb->crate_y*CRATES_X];
+ for(unsigned int x=0; x<CRATE_WIDTH; x++){
+ for(unsigned int y=0; y<CRATE_HEIGHT; y++){
+ 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_input[dst] = fb->rgb_data[src];
+ framebuffer_input[dst + 1] = fb->rgb_data[src + 1];
+ framebuffer_input[dst + 2] = fb->rgb_data[src + 2];
+ }
}
}
-
- UARTprintf("Starting DMA.\n");
- kickoff_transfers();
+ return len;
+length_error:
+ UARTprintf("Invalid packet length\n");
return len;
}
void kickoff_transfers() {
+ while(MAP_uDMAChannelIsEnabled(11)
+ || MAP_uDMAChannelIsEnabled(25)
+ || MAP_uDMAChannelIsEnabled(13)
+ || MAP_uDMAChannelIsEnabled(15)){
+ UARTprintf("A DMA tranfer is still running\n");
+ /* Idle for some time to give the µDMA controller a chance to complete its job */
+ SysCtlDelay(5000);
+ }
+ /* Wait 1.2ms (20kCy @ 50MHz) to ensure the WS2801 latch this frame's data */
+ SysCtlDelay(20000);
/* Swap buffers */
unsigned char *tmp = framebuffer_output;
framebuffer_output = framebuffer_input;
@@ -195,7 +200,7 @@ void kickoff_transfers() { kickoff_transfer(15, 3, SSI3_BASE);
}
-void kickoff_transfer(unsigned int channel, unsigned int offset, int base) {
+inline void kickoff_transfer(unsigned int channel, unsigned int offset, int base) {
MAP_uDMAChannelTransferSet(channel | UDMA_PRI_SELECT, UDMA_MODE_BASIC, framebuffer_output+BUS_SIZE*offset, (void *)(base + SSI_O_DR), BUS_SIZE);
MAP_uDMAChannelEnable(channel);
}
@@ -302,8 +307,6 @@ int main(void) { MAP_SSIDMAEnable(SSI2_BASE, SSI_DMA_TX);
MAP_SSIDMAEnable(SSI3_BASE, SSI_DMA_TX);
- MAP_IntEnable(INT_SSI0);
-
/* Enable the SSIs after configuring anything around them. */
MAP_SSIEnable(SSI0_BASE);
MAP_SSIEnable(SSI1_BASE);
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