Diff: targets/hal/TARGET_STM/TARGET_STM32F4XX/pinmap.c

Revision:

20:4263a77256ae

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_STM32F4XX/pinmap.c	Tue Sep 10 15:14:19 2013 +0300
@@ -0,0 +1,73 @@
+/* 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"
+
+/**
+ * Set the pin into input, output, alternate function or analog mode
+ */
+void pin_function(PinName pin, int data) {
+    if (pin == (uint32_t)NC) return;
+    
+    int mode = STM_PIN_MODE(data);
+    int func = STM_PIN_FUNC(data);
+    
+    uint32_t pin_number = (uint32_t)pin;
+    int port_index = pin_number >> 4;
+    int pin_index = (pin_number & 0xF);
+    GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
+    
+    // MODE
+    int offset = pin_index << 1;
+    gpio->MODER &= ~(0x3 << offset);
+    gpio->MODER |= mode << offset;
+    
+    // Set high-speed mode
+    gpio->OSPEEDR &= ~(0x3 << offset);
+    gpio->OSPEEDR |= (0x2 << offset);
+    
+    // FUNCTION
+    // Bottom seven pins are in AFR[0], top seven in AFR[1]
+    offset = (pin_index & 0x7) << 2;
+    if (pin_index <= 0x7) {
+        gpio->AFR[0] &= ~(0xF << offset);
+        gpio->AFR[0] |= func << offset;
+    }
+    else {
+        gpio->AFR[1] &= ~(0xF << offset);
+        gpio->AFR[1] |= func << offset;
+    }
+}
+
+void pin_mode(PinName pin, PinMode mode) {
+    if (pin == (uint32_t)NC) { return; }
+
+    uint32_t pin_number = (uint32_t)pin;
+    int port_index = pin_number >> 4;
+    int pin_index = (pin_number & 0xF);
+    int offset = pin_index << 1;
+
+    GPIO_TypeDef * gpio = ((GPIO_TypeDef *) (GPIOA_BASE + (port_index << 10)));
+    if (mode == OpenDrain) {
+        gpio->OTYPER |= 1 << pin_index;
+    }
+    else {
+        gpio->OTYPER &= ~(1 << pin_index);
+        gpio->PUPDR &= ~(0x3 << offset);
+        gpio->PUPDR |= mode << offset;
+    }
+}
+