Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Freescale/TARGET_K20XX/gpio_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 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2015 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 18 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 uint32_t gpio_set(PinName pin) {
<> 144:ef7eb2e8f9f7 21 MBED_ASSERT(pin != (PinName)NC);
<> 144:ef7eb2e8f9f7 22 pin_function(pin, 1);
<> 144:ef7eb2e8f9f7 23 return 1 << ((pin & 0x7F) >> 2);
<> 144:ef7eb2e8f9f7 24 }
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 void gpio_init(gpio_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 27 obj->pin = pin;
<> 144:ef7eb2e8f9f7 28 if (pin == (PinName)NC)
<> 144:ef7eb2e8f9f7 29 return;
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 obj->mask = gpio_set(pin);
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 GPIO_Type *reg = (GPIO_Type *)(PTA_BASE + port * 0x40);
<> 144:ef7eb2e8f9f7 36 obj->reg_set = &reg->PSOR;
<> 144:ef7eb2e8f9f7 37 obj->reg_clr = &reg->PCOR;
<> 144:ef7eb2e8f9f7 38 obj->reg_in = &reg->PDIR;
<> 144:ef7eb2e8f9f7 39 obj->reg_dir = &reg->PDDR;
<> 144:ef7eb2e8f9f7 40 }
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 void gpio_mode(gpio_t *obj, PinMode mode) {
<> 144:ef7eb2e8f9f7 43 pin_mode(obj->pin, mode);
<> 144:ef7eb2e8f9f7 44 }
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 void gpio_dir(gpio_t *obj, PinDirection direction) {
<> 144:ef7eb2e8f9f7 47 MBED_ASSERT(obj->pin != (PinName)NC);
<> 144:ef7eb2e8f9f7 48 switch (direction) {
<> 144:ef7eb2e8f9f7 49 case PIN_INPUT :
<> 144:ef7eb2e8f9f7 50 *obj->reg_dir &= ~obj->mask;
<> 144:ef7eb2e8f9f7 51 break;
<> 144:ef7eb2e8f9f7 52 case PIN_OUTPUT:
<> 144:ef7eb2e8f9f7 53 *obj->reg_dir |= obj->mask;
<> 144:ef7eb2e8f9f7 54 break;
<> 144:ef7eb2e8f9f7 55 }
<> 144:ef7eb2e8f9f7 56 }