Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/pinmap.c

Revision:

52:a51c77007319

Child:

58:3b55b7a41411

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/pinmap.c	Mon Dec 02 11:30:05 2013 +0000
@@ -0,0 +1,120 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 "pinmap.h"
+#include "error.h"
+
+// Alternate-function mapping
+static const uint32_t AF_mapping[] = {
+  0,                   // 0 = No AF
+  GPIO_Remap_SPI1,     // 1
+  GPIO_Remap_I2C1,     // 2
+  GPIO_Remap_USART1,   // 3
+  GPIO_Remap_USART2,   // 4
+  GPIO_FullRemap_TIM2, // 5
+  GPIO_FullRemap_TIM3, // 6
+  GPIO_Remap_I2C1      // 7
+};
+
+/**
+ * Set the pin function (input, output, alternate function or analog) + output speed + AF
+ */
+void pin_function(PinName pin, int data) {
+    if (pin == NC) return;
+
+    // Get the pin mode and alternate-function number
+    uint32_t mode  = STM_PIN_MODE(data);
+    uint32_t afnum = STM_PIN_AFNUM(data);
+
+    // Get GPIO structure base address
+    uint32_t pin_number = (uint32_t)pin;
+    uint32_t pin_index  = (pin_number & 0xF);
+    uint32_t port_index = (pin_number >> 4);
+    GPIO_TypeDef *gpio  = ((GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10)));
+
+    // Enable GPIO and AFIO clocks
+    RCC_APB2PeriphClockCmd((uint32_t)(RCC_APB2Periph_GPIOA << port_index), ENABLE);
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
+  
+    // Configure GPIO
+    GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitStructure.GPIO_Pin   = (uint16_t)(1 << pin_index);
+    GPIO_InitStructure.GPIO_Mode  = (GPIOMode_TypeDef)mode;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(gpio, &GPIO_InitStructure);
+
+    // Configure Alternate Function
+    if (afnum > 0) {
+        GPIO_PinRemapConfig(AF_mapping[afnum], ENABLE);
+    }
+    
+    // Disconnect JTAG-DP + SW-DP signals.
+    // Warning: Need to reconnect under reset
+    if ((pin == PA_13) || (pin == PA_14)) {
+        GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable, ENABLE);
+    }
+    if ((pin == PA_15) || (pin == PB_3) || (pin == PB_4)) {
+        GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
+    }    
+}
+
+/**
+ * Set the pin mode (open-drain/push-pull + pull-up/pull-down)
+ */
+void pin_mode(PinName pin, PinMode mode) {
+    if (pin == NC) return;
+
+    GPIO_InitTypeDef GPIO_InitStructure;
+  
+    // Get GPIO structure base address
+    uint32_t pin_number = (uint32_t)pin;
+    uint32_t pin_index  = (pin_number & 0xF);
+    uint32_t port_index = (pin_number >> 4);
+    GPIO_TypeDef *gpio  = ((GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10)));
+
+    // Enable GPIO clock
+    RCC_APB2PeriphClockCmd((uint32_t)(RCC_APB2Periph_GPIOA << port_index), ENABLE);
+  
+    // Configure open-drain and pull-up/down
+    switch (mode) {
+      case PullNone:       
+        return;
+      case PullUp:
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+      break;
+      case PullDown:
+        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+      break;
+      case OpenDrain:
+        if (pin_index < 8) {
+            if ((gpio->CRL & (0x03 << (pin_index * 4))) > 0) { // MODE bits = Output mode
+                gpio->CRL |= (0x04 << (pin_index * 4)); // Set open-drain
+            }
+        }
+        else {
+            if ((gpio->CRH & (0x03 << ((pin_index % 8) * 4))) > 0) { // MODE bits = Output mode          
+                gpio->CRH |= (0x04 << ((pin_index % 8) * 4)); // Set open-drain
+            }
+        }
+        return;
+      default:
+      break;
+    }
+    
+    // Configure GPIO
+    GPIO_InitStructure.GPIO_Pin   = (uint16_t)(1 << pin_index);
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(gpio, &GPIO_InitStructure);    
+}