marcus chiou
mbed library sources
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mbed-src
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mbed official
Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/pinmap_function.c
- Revision:
- 592:a274ee790e56
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Atmel/TARGET_SAM21/pinmap_function.c Fri Jul 17 09:15:10 2015 +0100
@@ -0,0 +1,221 @@
+/* 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 <stddef.h>
+#include "us_ticker_api.h"
+#include "cmsis.h"
+#include "mbed_assert.h"
+#include "ins_gclk.h"
+#include "compiler.h"
+#include "system.h"
+
+#include "pinmap_function.h"
+
+static uint32_t pinmap_merge_pins(uint32_t a, uint32_t b)
+{
+ // both are the same (inc both NC)
+ if (a == b)
+ return a;
+
+ // one (or both) is not connected
+ if (a == (uint32_t)NC)
+ return b;
+ if (b == (uint32_t)NC)
+ return a;
+
+ return (uint32_t)NC;
+}
+
+/** Find the common SERCOM shared by two pins
+ *
+ * Finds the common SERCOM index of two input pins.
+ * If swapping the input argument gives different result, it means, two SERCOMs share both pins
+ * @param[in] pin1 First pin
+ * @param[in] pin2 Second pin
+ * @return SERCOM index if found, else, NC
+ */
+uint32_t pinmap_merge_sercom(PinName pin1, PinName pin2)
+{
+ int i, j;
+ uint32_t pin1_sercom[2];
+ uint32_t pin2_sercom[2];
+ uint32_t sercom_index[4];
+
+ uint32_t pin_com = NC;
+ uint32_t pin_alt = NC;
+ uint32_t count_com = 0;
+ uint32_t count_alt = 0;
+
+ /* Adding a condition check just in case we need a different result when swapping arguments */
+ if (pin1 >= pin2) {
+ pin1_sercom[0] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PAD);
+ pin1_sercom[1] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PADEx);
+ } else {
+ pin1_sercom[0] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PADEx);
+ pin1_sercom[1] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PAD);
+ }
+
+ pin2_sercom[0] = pinmap_find_peripheral(pin2, PinMap_SERCOM_PAD);
+ pin2_sercom[1] = pinmap_find_peripheral(pin2, PinMap_SERCOM_PADEx);
+
+ for (i=0; i<2; i++) {
+ if (pin1_sercom[i] != NC) {
+ pin1_sercom[i] &= 0x0F;
+ }
+ for (j=0; j<2; j++) {
+ if (pin2_sercom[i] != NC) {
+ pin2_sercom[i] &= 0x0F;
+ }
+ sercom_index[(i*2) + j] = pinmap_merge_pins(pin1_sercom[i], pin2_sercom[j]);
+ }
+ }
+
+ for (i=0; i<4; i++) {
+ if (sercom_index[i] != NC) {
+ if (pin_com == NC) {
+ pin_com = sercom_index[i];
+ count_com++;
+ } else if (pin_com == sercom_index[i]) {
+ count_com++;
+ } else if (pin_alt == NC) {
+ pin_alt = sercom_index[i];
+ count_alt++;
+ } else if (pin_alt == sercom_index[i]) {
+ count_alt++;
+ } else {}
+ }
+ }
+ return ((count_com >= count_alt) ? pin_com : pin_alt);
+}
+
+/** Find the common SERCOM shared by four pins
+ *
+ * Finds the common SERCOM index shared by four input pins.
+ * If reversing the input argument order gives different result, it means, two SERCOMs share the pins
+ * @param[in] pin1 First pin
+ * @param[in] pin2 Second pin
+ * @param[in] pin3 Third pin
+ * @param[in] pin4 Fourth pin
+ * @return SERCOM index if found, else, NC
+ */
+uint32_t pinmap_find_sercom(PinName pin1, PinName pin2, PinName pin3, PinName pin4)
+{
+ int i;
+ uint32_t sercom_index[4];
+ uint32_t pin_com = NC;
+ uint32_t pin_alt = NC;
+ uint32_t count_com = 0;
+ uint32_t count_alt = 0;
+
+ sercom_index[0] = pinmap_merge_sercom(pin1, pin2);
+ sercom_index[1] = pinmap_merge_sercom(pin3, pin3);
+ sercom_index[2] = pinmap_merge_sercom(pin1, pin3);
+ sercom_index[3] = pinmap_merge_sercom(pin2, pin4);
+
+
+ for (i=0; i<4; i++) {
+ if (sercom_index[i] != NC) {
+ if (pin_com == NC) {
+ pin_com = sercom_index[i];
+ count_com++;
+ } else if (pin_com == sercom_index[i]) {
+ count_com++;
+ } else if (pin_alt == NC) {
+ pin_alt = sercom_index[i];
+ count_alt++;
+ } else if (pin_alt == sercom_index[i]) {
+ count_alt++;
+ } else {}
+ }
+ }
+ return ((count_com >= count_alt) ? pin_com : pin_alt);
+}
+
+/** Find the MUX function of input pin specific to given SERCOM index
+ *
+ * @param[in] pin Pin whose function is to be found out
+ * @param[in] sercom_index SERCOM index
+ * @return MUX function if found, else, NC
+ */
+uint32_t pinmap_function_sercom(PinName pin, uint32_t sercom_index)
+{
+ uint32_t func = NC;
+ uint32_t index;
+ sercom_index &= 0x0F;
+
+ if ((pin == NC) || (sercom_index >= SERCOM_INST_NUM)) {
+ return NC;
+ }
+ index = pinmap_peripheral(pin, PinMap_SERCOM_PAD);
+ if ((index & 0x0F) == sercom_index) {
+ func = pinmap_function(pin, PinMap_SERCOM_PAD);
+ return func;
+ }
+ index = pinmap_peripheral(pin, PinMap_SERCOM_PADEx);
+ if ((index & 0x0F) == sercom_index) {
+ func = pinmap_function(pin, PinMap_SERCOM_PADEx);
+ return func;
+ }
+ return NC;
+}
+
+/** Find the MUX pad of input pin specific to given SERCOM index
+ *
+ * @param[in] pin Pin whose function is to be found out
+ * @param[in] sercom_index SERCOM index
+ * @return MUX pad if found, else, NC
+ */
+uint32_t pinmap_pad_sercom(PinName pin, uint32_t sercom_index)
+{
+ uint32_t index;
+ sercom_index &= 0x0F;
+
+ if ((pin == NC) || (sercom_index >= SERCOM_INST_NUM)) {
+ return NC;
+ }
+ index = pinmap_peripheral(pin, PinMap_SERCOM_PAD);
+ if ((index & 0x0F) == sercom_index) {
+ return ((index >> 4) & 0x0F);
+ }
+ index = pinmap_peripheral(pin, PinMap_SERCOM_PADEx);
+ if ((index & 0x0F) == sercom_index) {
+ return ((index >> 4) & 0x0F);
+ }
+ return NC;
+}
+
+/** Find the MUX function of input pin specific to given SERCOM index
+ *
+ * @param[in] pin unused
+ * @param[in] sercom_index SERCOM index
+ * @return base address to SERCOM if found, else NC
+ */
+uint32_t pinmap_peripheral_sercom(PinName pin, uint32_t sercom_index)
+{
+ uint32_t sercom_address[6] = {
+ 0x42000800UL, // Base address of SERCOM0
+ 0x42000C00UL, // Base address of SERCOM1
+ 0x42001000UL, // Base address of SERCOM2
+ 0x42001400UL, // Base address of SERCOM3
+ 0x42001800UL, // Base address of SERCOM4
+ 0x42001C00UL // Base address of SERCOM5
+ };
+ uint32_t index = sercom_index & 0x0F;
+
+ if (index >= SERCOM_INST_NUM) {
+ return NC;
+ }
+ return sercom_address[(sercom_index&0x0F)];
+}
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