From e41764fceeabb1cdb6a7a299e00f2166a6f6ac32 Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Thu, 18 Jun 2020 13:26:56 +0100
Subject: moved stm32 into directory added noddy pcb

---
 stm32/app/oled2.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 stm32/app/oled2.c

(limited to 'stm32/app/oled2.c')

diff --git a/stm32/app/oled2.c b/stm32/app/oled2.c
new file mode 100644
index 0000000..bccb4ba
--- /dev/null
+++ b/stm32/app/oled2.c
@@ -0,0 +1,124 @@
+#include "project.h"
+
+
+static uint8_t dma_buf[DMA_BUF_SZ];
+uint8_t vram_2[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_2, DMA_BUF_SZ);
+
+  if (ssd1306_cmds (I2C2, cmds, sizeof (cmds), 0)) {
+    oled_sad++;
+    return;
+  }
+
+  if (i2cp_start_transaction (I2C2, SSD1306_I2C_ADDRESS, I2C_WRITE)) {
+    oled_sad++;
+    return;
+  }
+
+  refresh_wdt = 0;
+  dma_in_progress = 1;
+
+  i2cp2_start_dma (dma_buf, DMA_BUF_SZ);
+}
+
+
+
+void
+dma1_channel4_isr (void)
+{
+  if (dma_in_progress) {
+    i2cp2_stop_dma();
+
+    i2cp_stop (I2C2);
+    dma_in_progress = 0;
+  }
+
+  if (refresh_enabled)
+    start_dma();
+}
+
+void
+oled2_ticker (void)
+{
+  if (!refresh_enabled)
+    return;
+
+  refresh_wdt++;
+
+  if ((refresh_wdt < MS_TO_TICKS (1000)) && (!oled_sad))
+    return;
+
+  refresh_wdt = 0;
+
+  /*No refresh for 1s, restart everything */
+
+  i2cp2_stop_dma();
+  i2cp_stop (I2C2);
+  dma_in_progress = 0;
+
+  if (oled_sad) {
+    oled_sad = 0;
+    i2cp2_reset_sm();
+  }
+
+  start_dma();
+
+}
+
+void
+oled2_enable_refresh (void)
+{
+  refresh_enabled = 1;
+  start_dma();
+}
+
+
+void
+oled2_disable_refresh (void)
+{
+  refresh_enabled = 0;
+
+  while (dma_in_progress);
+}
+
+
+
+void
+oled2_init (void)
+{
+  oled_reset (I2C2);
+
+  delay_us (100);
+
+  oled_generate_stream (vram_2);
+
+  nvic_enable_irq (NVIC_DMA1_CHANNEL4_IRQ);
+  oled2_enable_refresh();
+}
+
+
+void
+oled2_shutdown (void)
+{
+  oled2_disable_refresh();
+  oled_off (I2C2);
+}
-- 
cgit v1.2.3