From 5cdfcb08fbcaca99c92c157eb929a38ddf6415bb Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Mon, 15 Jun 2020 12:47:22 +0100
Subject: working 2nd display

---
 app/oled1.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 app/oled1.c

(limited to 'app/oled1.c')

diff --git a/app/oled1.c b/app/oled1.c
new file mode 100644
index 0000000..48c6167
--- /dev/null
+++ b/app/oled1.c
@@ -0,0 +1,127 @@
+#include "project.h"
+
+
+static uint8_t dma_buf[DMA_BUF_SZ];
+uint8_t vram_1[DMA_BUF_SZ];
+
+static int dma_in_progress = 0;
+static int refresh_enabled = 0;
+static uint32_t refresh_wdt = 0;
+static int oled_sad = 0;
+
+
+static void
+start_dma (void)
+{
+  uint8_t cmds[] = {
+    SSD1306_SET_PAGE_ADDR, 0, 0xff,
+    SSD1306_SET_COLUMN_ADDR, 0, SSD1306_WIDTH - 1
+  };
+
+  if (dma_in_progress)
+    return;
+
+
+  memcpy (dma_buf, vram_1, DMA_BUF_SZ);
+
+  if (ssd1306_cmds (I2C1, cmds, sizeof (cmds), 0))
+    {
+      oled_sad++;
+      return;
+    }
+
+  if (i2cp_start_transaction (I2C1, SSD1306_I2C_ADDRESS, I2C_WRITE))
+    {
+      oled_sad++;
+      return;
+    }
+
+  refresh_wdt = 0;
+  dma_in_progress = 1;
+
+  i2cp1_start_dma (dma_buf, DMA_BUF_SZ);
+}
+
+
+
+void
+dma1_channel6_isr (void)
+{
+  if (dma_in_progress)
+    {
+      i2cp1_stop_dma ();
+
+      i2cp_stop (I2C1);
+      dma_in_progress = 0;
+    }
+
+  if (refresh_enabled)
+    start_dma ();
+}
+
+void
+oled1_ticker (void)
+{
+  if (!refresh_enabled)
+    return;
+
+  refresh_wdt++;
+
+  if ((refresh_wdt < 1000) && (!oled_sad))
+    return;
+
+  refresh_wdt = 0;
+
+/*No refresh for 1s, restart everything */
+
+  i2cp1_stop_dma ();
+  i2cp_stop (I2C1);
+  dma_in_progress = 0;
+
+  if (oled_sad)
+    {
+      oled_sad = 0;
+      i2cp1_reset_sm ();
+    }
+
+  start_dma ();
+
+}
+
+void
+oled1_enable_refresh (void)
+{
+  refresh_enabled = 1;
+  start_dma ();
+}
+
+
+void
+oled1_disable_refresh (void)
+{
+  refresh_enabled = 0;
+  while (dma_in_progress);
+}
+
+
+
+void
+oled1_init (void)
+{
+  oled_reset (I2C1);
+
+  delay_us (100);
+
+  oled_generate_stream (vram_1);
+
+  nvic_enable_irq (NVIC_DMA1_CHANNEL6_IRQ);
+  oled1_enable_refresh ();
+}
+
+
+void
+oled1_shutdown (void)
+{
+  oled1_disable_refresh ();
+  oled_off (I2C1);
+}
-- 
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