Diff: targets/TARGET_STM/port_api.c

Revision:

0:85b3fd62ea1a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/port_api.c	Mon Mar 16 06:35:48 2020 +0000
@@ -0,0 +1,102 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2016, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "port_api.h"
+#include "pinmap.h"
+#include "gpio_api.h"
+#include "mbed_error.h"
+
+#if DEVICE_PORTIN || DEVICE_PORTOUT
+
+extern GPIO_TypeDef *Set_GPIO_Clock(uint32_t port_idx);
+
+// 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;
+
+    // Enable GPIO clock
+    GPIO_TypeDef *gpio =  Set_GPIO_Clock(port_index);
+
+    // 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(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
+            } else { // PIN_INPUT
+                pin_function(port_pin(obj->port, i), STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 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