Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/port_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file port_api.c
<> 144:ef7eb2e8f9f7 3 *******************************************************************************
<> 144:ef7eb2e8f9f7 4 * @section License
<> 144:ef7eb2e8f9f7 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 6 *******************************************************************************
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 11 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 12 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 19 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 20 * limitations under the License.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 ******************************************************************************/
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25 #if DEVICE_PORTOUT
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 #include "port_api.h"
<> 144:ef7eb2e8f9f7 28 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 29 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 30 #include "em_gpio.h"
<> 144:ef7eb2e8f9f7 31 #include "em_cmu.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #define PORT_NUM_PINS 16
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 PinName port_pin(PortName port, int pin_n)
<> 144:ef7eb2e8f9f7 36 {
<> 144:ef7eb2e8f9f7 37 return (PinName) (pin_n | port << 4); // Encode pin and port number in one uint32
<> 144:ef7eb2e8f9f7 38 }
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
<> 144:ef7eb2e8f9f7 41 {
<> 144:ef7eb2e8f9f7 42 obj->mask = mask;
<> 144:ef7eb2e8f9f7 43 obj->port = port;
<> 144:ef7eb2e8f9f7 44 obj->dir = dir;
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 port_dir(obj, obj->dir);
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 void port_mode(port_t *obj, PinMode mode)
<> 144:ef7eb2e8f9f7 50 {
<> 144:ef7eb2e8f9f7 51 /* Set mode for pins given by mask */
<> 144:ef7eb2e8f9f7 52 uint32_t pin;
<> 144:ef7eb2e8f9f7 53 for (pin = 0; pin < PORT_NUM_PINS; pin++) {
<> 144:ef7eb2e8f9f7 54 if (obj->mask & (1 << pin)) {
<> 144:ef7eb2e8f9f7 55 pin_mode(port_pin(obj->port, pin), mode);
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57 }
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void port_dir(port_t *obj, PinDirection dir)
<> 144:ef7eb2e8f9f7 61 {
<> 144:ef7eb2e8f9f7 62 obj->dir = dir;
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 /* Set default pin mode for pins given by mask */
<> 144:ef7eb2e8f9f7 65 switch (dir) {
<> 144:ef7eb2e8f9f7 66 case PIN_INPUT:
<> 144:ef7eb2e8f9f7 67 port_mode(obj, Input);
<> 144:ef7eb2e8f9f7 68 break;
<> 144:ef7eb2e8f9f7 69 case PIN_OUTPUT:
<> 144:ef7eb2e8f9f7 70 port_mode(obj, PushPull);
<> 144:ef7eb2e8f9f7 71 break;
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 void port_write(port_t *obj, int value)
<> 144:ef7eb2e8f9f7 76 {
<> 144:ef7eb2e8f9f7 77 GPIO_PortOutSetVal(obj->port, value, obj->mask);
<> 144:ef7eb2e8f9f7 78 }
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 int port_read(port_t *obj)
<> 144:ef7eb2e8f9f7 81 {
<> 144:ef7eb2e8f9f7 82 if (obj->dir == PIN_INPUT) {
<> 144:ef7eb2e8f9f7 83 return (int) (GPIO_PortInGet(obj->port) & obj->mask);
<> 144:ef7eb2e8f9f7 84 } else {
<> 144:ef7eb2e8f9f7 85 return (int) (GPIO_PortOutGet(obj->port) & obj->mask);
<> 144:ef7eb2e8f9f7 86 }
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 #endif