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

Revision:

52:a51c77007319

Child:

70:c1fbde68b492

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/port_api.c	Mon Dec 02 11:30:05 2013 +0000
@@ -0,0 +1,85 @@
+/* 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 "port_api.h"
+#include "pinmap.h"
+#include "gpio_api.h"
+
+#if DEVICE_PORTIN || DEVICE_PORTOUT
+
+// high nibble = port number (0=A, 1=B, 2=C, 3=D, 4=E, 5=F, ...)
+// low nibble  = pin number
+PinName port_pin(PortName port, int pin_n) {
+  return (PinName)(pin_n + (port << 4));
+}
+
+void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
+
+    uint32_t port_index = (uint32_t)port; // (0=A, 1=B, 2=C, 3=D, 4=E, 5=F, ...)
+
+    // Enable GPIO clock
+    RCC_APB2PeriphClockCmd((RCC_APB2Periph_GPIOA << port_index), ENABLE);
+
+    // Get GPIO structure base address
+    GPIO_TypeDef *gpio = (GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10));
+
+    // Fill PORT object structure for future use
+    obj->port      = port;
+    obj->mask      = mask;
+    obj->direction = dir;  
+    obj->reg_in    = &gpio->IDR;
+    obj->reg_out   = &gpio->ODR;  
+
+    port_dir(obj, dir);
+}
+
+void port_dir(port_t *obj, PinDirection dir) {
+    uint32_t i;
+    obj->direction = dir;
+    for (i = 0; i < 16; i++) { // Process all pins
+        if (obj->mask & (1 << i)) { // If the pin is used
+            if (dir == PIN_OUTPUT) {
+                pin_function(port_pin(obj->port, i), STM_PIN_DATA(GPIO_Mode_Out_PP, 0));
+            }
+            else { // PIN_INPUT
+                pin_function(port_pin(obj->port, i), STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
+            }
+        }
+    }  
+}
+
+void port_mode(port_t *obj, PinMode mode) {
+    uint32_t i;  
+    for (i = 0; i < 16; i++) { // Process all pins
+        if (obj->mask & (1 << i)) { // If the pin is used
+            pin_mode(port_pin(obj->port, i), mode);
+        }
+    }
+}
+
+void port_write(port_t *obj, int value) {
+    *obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
+}
+
+int port_read(port_t *obj) {
+    if (obj->direction == PIN_OUTPUT) {
+        return (*obj->reg_out & obj->mask);
+    }
+    else { // PIN_INPUT
+        return (*obj->reg_in & obj->mask);
+    }
+}
+
+#endif