LPC1768: Allow I2C master channel override (#16584)

Marlin/src/HAL/HAL_LPC1768/include/i2c_util.c

@@ -0,0 +1,71 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * HAL_LPC1768/include/i2c_util.c
+ */
+
+#ifdef TARGET_LPC1768
+
+#include "../../../inc/MarlinConfigPre.h"
+#include "i2c_util.h"
+
+#define U8G_I2C_OPT_FAST 16  // from u8g.h
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+void configure_i2c(const uint8_t clock_option) {
+  /**
+   * Init I2C pin connect
+   */
+  PINSEL_CFG_Type PinCfg;
+  PinCfg.OpenDrain = 0;
+  PinCfg.Pinmode = 0;
+  PinCfg.Portnum = 0;
+  #if USEDI2CDEV_M == 0
+    PinCfg.Funcnum = 1;
+    PinCfg.Pinnum = 27;     // SDA0 / D57  AUX-1 ... SCL0 / D58  AUX-1
+  #elif USEDI2CDEV_M == 1
+    PinCfg.Funcnum = 3;
+    PinCfg.Pinnum = 0;      // SDA1 / D20 SCA ... SCL1 / D21 SCL
+  #elif USEDI2CDEV_M == 2
+    PinCfg.Funcnum = 2;
+    PinCfg.Pinnum = 10;     // SDA2 / D38  X_ENABLE_PIN ... SCL2 / D55  X_DIR_PIN
+  #endif
+  PINSEL_ConfigPin(&PinCfg);
+  PinCfg.Pinnum += 1;
+  PINSEL_ConfigPin(&PinCfg);
+
+  // Initialize I2C peripheral
+  I2C_Init(I2CDEV_M, (clock_option & U8G_I2C_OPT_FAST) ? 400000: 100000);  // LCD data rates
+
+  // Enable Master I2C operation
+  I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
+}
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif // TARGET_LPC1768