boards/esp32-ttgo-t-beam: switch on GPS module

boards/esp32-ttgo-t-beam/board.c

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2019 Gunar Schorcht
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_esp32_ttgo-t-beam
+ * @{
+ *
+ * @file
+ * @brief       Board specific definitions for TTGO T-Beam board
+ *
+ * @author      Gunar Schorcht <gunar@schorcht.net>
+ */
+
+#include "board.h"
+
+#if MODULE_ESP32_TTGO_T_BEAM_V1_0
+#include "periph/i2c.h"
+#endif
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define AXP192_I2C_ADDR         (0x34)
+#define AXP192_LDO234_DC23_CTL  (0x12)
+#define AXP192_LDO3OUT_VOL      (0x29)
+#define AXP192_LDO3_ON_BIT      (1 << 3)
+
+void board_init(void)
+{
+    board_init_common();
+
+#if MODULE_ESP32_TTGO_T_BEAM_V1_0
+    uint8_t reg;
+
+    i2c_acquire(I2C_DEV(0));
+    /* enable the LDO3 power control */
+    i2c_read_reg(I2C_DEV(0), AXP192_I2C_ADDR, AXP192_LDO234_DC23_CTL, &reg, 0);
+    reg |= AXP192_LDO3_ON_BIT;
+    i2c_write_reg(I2C_DEV(0), AXP192_I2C_ADDR, AXP192_LDO234_DC23_CTL, reg, 0);
+    /* set the output voltage to 3V3 */
+    i2c_write_reg(I2C_DEV(0), AXP192_I2C_ADDR, AXP192_LDO3OUT_VOL, 0xff, 0);
+    i2c_release(I2C_DEV(0));
+#endif
+}
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+/** @} */