altos: Add STM DMA debugging

This provides a command that shows current DMA operations when
compiled with -DDEBUG=1. Without that, this patch has no effect.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/stm/ao_dma_stm.c b/src/stm/ao_dma_stm.c
index 93b7fb47e1da815545d843cc2ae4838e65759264..0135de48e9e9131e619a8fc81b493ee23dfed4a8 100644 (file)
--- a/src/stm/ao_dma_stm.c
+++ b/src/stm/ao_dma_stm.c
@@ -113,6 +113,40 @@ ao_dma_alloc(uint8_t index)
        ao_dma_allocated[index] = 1;
 }
 
+#if DEBUG
+void
+ao_dma_dump_cmd(void)
+{
+       int i;
+
+       ao_arch_critical(
+               if (ao_dma_active++ == 0)
+                       stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_DMA1EN);
+               );
+       printf ("isr %08x ifcr%08x\n", stm_dma.isr, stm_dma.ifcr);
+       for (i = 0; i < NUM_DMA; i++)
+               printf("%d: done %d allocated %d mutex %2d ccr %04x cndtr %04x cpar %08x cmar %08x isr %08x\n",
+                      i,
+                      ao_dma_done[i],
+                      ao_dma_allocated[i],
+                      ao_dma_mutex[i],
+                      stm_dma.channel[i].ccr,
+                      stm_dma.channel[i].cndtr,
+                      stm_dma.channel[i].cpar,
+                      stm_dma.channel[i].cmar,
+                      ao_dma_config[i].isr);
+       ao_arch_critical(
+               if (--ao_dma_active == 0)
+                       stm_rcc.ahbenr &= ~(1 << STM_RCC_AHBENR_DMA1EN);
+               );
+}
+
+static const struct ao_cmds ao_dma_cmds[] = {
+       { ao_dma_dump_cmd,      "D\0Dump DMA status" },
+       { 0, NULL }
+};
+#endif
+
 void
 ao_dma_init(void)
 {
@@ -124,5 +158,7 @@ ao_dma_init(void)
                ao_dma_allocated[index] = 0;
                ao_dma_mutex[index] = 0;
        }
-       
+#if DEBUG
+       ao_cmd_register(&ao_dma_cmds[0]);
+#endif
 }