# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1540314544 -7200
# Node ID 06aa97e33e1e84722475a42d19a982d6bca86b7c
# Parent  d1226062d91ce5a7e065e1c03fa9f00c9b57ff29
Replaced usage of the DMA interrupt with the Timer3 event for the zero channel.

diff -r d1226062d91c -r 06aa97e33e1e examples/vga-timer/main.c
--- a/examples/vga-timer/main.c	Tue Oct 23 19:01:07 2018 +0200
+++ b/examples/vga-timer/main.c	Tue Oct 23 19:09:04 2018 +0200
@@ -102,7 +102,7 @@
                   |
        Timer3 -> DMA1: linedata -> PORTB
                   |
-         DMA1 -> DMA2: zerodata -> PORTB
+       Timer3 -> DMA2: zerodata -> PORTB
     */
 
     /* Initiate DMA on the Timer2 interrupt condition, transferring line data to
@@ -125,14 +125,13 @@
     dma_set_transfer(1, PHYSICAL((uint32_t) screenstart), LINE_LENGTH,
                         HW_PHYSICAL(PORTB), 1,
                         1);
-    dma_init_interrupt(1, 0b00001000, 1, 3);
 
     /* Enable DMA on the preceding channel's completion, with this also
        initiating transfers. */
 
     dma_init(2, 3);
     dma_set_chaining(2, dma_chain_previous);
-    dma_set_interrupt(2, DMA1, 1);
+    dma_set_interrupt(2, T3, 1);
     dma_set_transfer(2, PHYSICAL((uint32_t) zerodata), ZERO_LENGTH,
                         HW_PHYSICAL(PORTB), 1,
                         ZERO_LENGTH);
@@ -230,18 +229,7 @@
 
 void visible_active(void)
 {
-    uint32_t ifs;
-
-    /* Remove any DMA interrupt condition (CHBCIF). */
-
-    ifs = REG(DMAIFS) & DMA_INT_FLAGS(1, DCHxIF);
-
-    if (ifs)
-    {
-        CLR_REG(DMA_REG(1, DCHxINT), 0b11111111);
-        CLR_REG(DMAIFS, ifs);
-        INV_REG(PORTA, 1 << 2);
-    }
+    INV_REG(PORTA, 1 << 2);
 
     if (line < VFP_START)
     {