From 32bdcfaf28122f42fd920c95778f71e5bda885d5 Mon Sep 17 00:00:00 2001
From: Joel Bodenmann <jbo@insane.engineer>
Date: Tue, 31 Oct 2023 12:30:19 +0100
Subject: [PATCH] SSD1312: Add example board file

---
 .../addons/gdisp/board_SSD1312_stm32cubehal.h | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 boards/addons/gdisp/board_SSD1312_stm32cubehal.h

diff --git a/boards/addons/gdisp/board_SSD1312_stm32cubehal.h b/boards/addons/gdisp/board_SSD1312_stm32cubehal.h
new file mode 100644
index 00000000..69cdf932
--- /dev/null
+++ b/boards/addons/gdisp/board_SSD1312_stm32cubehal.h
@@ -0,0 +1,92 @@
+#pragma once
+
+#include <stm32f4xx_hal.h>
+#include <string.h>
+
+// The command byte to put on the front of each page line
+#define SSD1312_PAGE_PREFIX	0x40		// Co = 0, D/C = 1
+
+static I2C_HandleTypeDef i2cHandle;
+
+static GFXINLINE void init_board(GDisplay *g)
+{
+    (void) g;
+
+    // GPIO
+    {
+        GPIO_InitTypeDef GPIO_InitStruct = {0};
+
+        __HAL_RCC_GPIOB_CLK_ENABLE();
+
+        // I2C SCL
+        GPIO_InitStruct.Pin         = GPIO_PIN_8;
+        GPIO_InitStruct.Mode        = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull        = GPIO_PULLUP;
+        GPIO_InitStruct.Speed       = GPIO_SPEED_FAST;
+        GPIO_InitStruct.Alternate   = GPIO_AF4_I2C1;
+        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+        // I2C SDA
+        GPIO_InitStruct.Pin         = GPIO_PIN_9;
+        GPIO_InitStruct.Mode        = GPIO_MODE_AF_OD;
+        GPIO_InitStruct.Pull        = GPIO_PULLUP;
+        GPIO_InitStruct.Speed       = GPIO_SPEED_FAST;
+        GPIO_InitStruct.Alternate   = GPIO_AF4_I2C1;
+        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+    }
+
+    // I2C1
+    {
+        __HAL_RCC_I2C1_CLK_ENABLE();
+
+        i2cHandle.Instance             = I2C1;
+        i2cHandle.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;
+        i2cHandle.Init.ClockSpeed      = 400000;
+        i2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
+        i2cHandle.Init.DutyCycle       = I2C_DUTYCYCLE_2;
+        i2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
+        i2cHandle.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLE;
+        if (HAL_I2C_Init(&i2cHandle) != HAL_OK)
+            gfxHalt("I2C HAL init error");
+    }
+}
+
+static GFXINLINE void post_init_board(GDisplay *g)
+{
+    (void) g;
+}
+
+static GFXINLINE void setpin_reset(GDisplay *g, gBool state)
+{
+    (void) g;
+    (void) state;
+}
+
+static GFXINLINE void acquire_bus(GDisplay *g)
+{
+    (void) g;
+}
+
+static GFXINLINE void release_bus(GDisplay *g)
+{
+    (void) g;
+}
+
+static GFXINLINE void write_cmd(GDisplay *g, gU8 *data, gU16 length)
+{
+    (void) g;
+
+    gU8 buf[4];		// length is always <= 3
+    buf[0] = 0x00;
+    memcpy(buf+1, data, length);
+
+    HAL_I2C_Master_Transmit(&i2cHandle, (0x3c << 1), buf, length+1, 10000);
+}
+
+static GFXINLINE void write_data(GDisplay *g, gU8 *data, gU16 length)
+{
+    (void) g;
+
+    HAL_I2C_Master_Transmit(&i2cHandle, (0x3c << 1), data, length, 10000);
+}
+