Add EMAC driver for GD32_F307VG

Author: ChazJin

features/netsocket/emac-drivers/TARGET_GD_EMAC/TARGET_GD32F30X/gd32f3_eth_init.c

@@ -0,0 +1,77 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 Gigadevice
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "gd32f30x.h"
+
+/**
+ * Initializes the HW pin for enet
+ *
+ */
+void enet_bsp_init(void)
+{
+    /* Enable GPIOs clocks */
+    rcu_periph_clock_enable(RCU_GPIOA);
+    rcu_periph_clock_enable(RCU_GPIOB);
+    rcu_periph_clock_enable(RCU_GPIOC);
+    rcu_periph_clock_enable(RCU_AF);
+
+    gpio_para_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_8);
+    rcu_pll2_config(RCU_PLL2_MUL10);
+    rcu_osci_on(RCU_PLL2_CK);
+    rcu_osci_stab_wait(RCU_PLL2_CK);
+    rcu_ckout0_config(RCU_CKOUT0SRC_CKPLL2);
+    gpio_ethernet_phy_select(GPIO_ENET_PHY_RMII);
+
+    /** ETH GPIO Configuration
+      RMII_REF_CLK ----------------------> PA1
+      RMII_MDIO -------------------------> PA2
+      RMII_MDC --------------------------> PC1
+      RMII_MII_CRS_DV -------------------> PA7
+      RMII_MII_RXD0 ---------------------> PC4
+      RMII_MII_RXD1 ---------------------> PC5
+      RMII_MII_TX_EN --------------------> PB11
+      RMII_MII_TXD0 ---------------------> PB12
+      RMII_MII_TXD1 ---------------------> PB13
+     */
+    /* PA1: ETH_RMII_REF_CLK */
+    gpio_para_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX, GPIO_PIN_1);
+    /* PA2: ETH_MDIO */
+    gpio_para_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_2);
+    /* PA7: ETH_RMII_CRS_DV */
+    gpio_para_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX, GPIO_PIN_7);
+
+    /* PB11: ETH_RMII_TX_EN */
+    gpio_para_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_11);
+    /* PB12: ETH_RMII_TXD0 */
+    gpio_para_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_12);
+    /* PB13: ETH_RMII_TXD1 */
+    gpio_para_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_13);
+
+    /* PC1: ETH_MDC */
+    gpio_para_init(GPIOC, GPIO_MODE_AF_PP, GPIO_OSPEED_MAX, GPIO_PIN_1);
+    /* PC4: ETH_RMII_RXD0 */
+    gpio_para_init(GPIOC, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX, GPIO_PIN_4);
+    /* PC5: ETH_RMII_RXD1 */
+    gpio_para_init(GPIOC, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_MAX, GPIO_PIN_5);
+
+    /* Enable the Ethernet global Interrupt */
+    nvic_irq_enable(ENET_IRQn, 0x7, 0);
+
+    /* Enable ETHERNET clock  */
+    rcu_periph_clock_enable(RCU_ENET);
+    rcu_periph_clock_enable(RCU_ENETTX);
+    rcu_periph_clock_enable(RCU_ENETRX);
+}