Paul Paterson / mbed-src-CanNucleoF0

mbed library sources, include can_api for nucleo-f091rc

Dependents:   CanNucleoF0_example

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F4XX/port_api.c@645:13c87cbecd54, 2016-01-07 (annotated)

Committer:
ptpaterson
Date:
Thu Jan 07 05:49:05 2016 +0000
Revision:
645:13c87cbecd54
Parent:
20:4263a77256ae 
corrected freeze on CAN_RECEIVE_IT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 */
bogdanm 20:4263a77256ae 16 #include "port_api.h"
bogdanm 20:4263a77256ae 17 #include "pinmap.h"
bogdanm 20:4263a77256ae 18 #include "gpio_api.h"
bogdanm 20:4263a77256ae 19
bogdanm 20:4263a77256ae 20 #if DEVICE_PORTIN || DEVICE_PORTOUT
bogdanm 20:4263a77256ae 21
bogdanm 20:4263a77256ae 22 PinName port_pin(PortName port, int pin_n) {
bogdanm 20:4263a77256ae 23 return pin_n + (port << 4);
bogdanm 20:4263a77256ae 24 }
bogdanm 20:4263a77256ae 25
bogdanm 20:4263a77256ae 26 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
bogdanm 20:4263a77256ae 27 obj->port = port;
bogdanm 20:4263a77256ae 28 obj->mask = mask;
bogdanm 20:4263a77256ae 29
bogdanm 20:4263a77256ae 30 uint32_t port_index = (uint32_t) port;
bogdanm 20:4263a77256ae 31
bogdanm 20:4263a77256ae 32 GPIO_TypeDef *port_reg = (GPIO_TypeDef *)(GPIOA_BASE + (port_index << 10));
bogdanm 20:4263a77256ae 33 // Enable GPIO peripheral clock
bogdanm 20:4263a77256ae 34 RCC->AHB1ENR |= 1 << port_index;
bogdanm 20:4263a77256ae 35
bogdanm 20:4263a77256ae 36 obj->reg_mode = &port_reg->MODER;
bogdanm 20:4263a77256ae 37 obj->reg_set = &port_reg->BSRRH;
bogdanm 20:4263a77256ae 38 obj->reg_clr = &port_reg->BSRRL;
bogdanm 20:4263a77256ae 39 obj->reg_in = &port_reg->IDR;
bogdanm 20:4263a77256ae 40 obj->reg_out = &port_reg->ODR;
bogdanm 20:4263a77256ae 41
bogdanm 20:4263a77256ae 42 port_dir(obj, dir);
bogdanm 20:4263a77256ae 43 }
bogdanm 20:4263a77256ae 44
bogdanm 20:4263a77256ae 45 void port_mode(port_t *obj, PinMode mode) {
bogdanm 20:4263a77256ae 46 uint32_t i;
bogdanm 20:4263a77256ae 47 // The mode is set per pin: reuse pinmap logic
bogdanm 20:4263a77256ae 48 for (i=0; i<16; i++) {
bogdanm 20:4263a77256ae 49 if (obj->mask & (1<<i)) {
bogdanm 20:4263a77256ae 50 pin_mode(port_pin(obj->port, i), mode);
bogdanm 20:4263a77256ae 51 }
bogdanm 20:4263a77256ae 52 }
bogdanm 20:4263a77256ae 53 }
bogdanm 20:4263a77256ae 54
bogdanm 20:4263a77256ae 55 void port_dir(port_t *obj, PinDirection dir) {
bogdanm 20:4263a77256ae 56 obj->direction = dir;
bogdanm 20:4263a77256ae 57 uint32_t tmp = *obj->reg_mode;
bogdanm 20:4263a77256ae 58 for (int i=0; i<16; i++) {
bogdanm 20:4263a77256ae 59 if (obj->mask & (1 << i)) {
bogdanm 20:4263a77256ae 60 // Clear the mode bits (i.e. set to input)
bogdanm 20:4263a77256ae 61 tmp &= ~(0x3 << (i << 1));
bogdanm 20:4263a77256ae 62 if (dir == PIN_OUTPUT) {
bogdanm 20:4263a77256ae 63 // Set to output
bogdanm 20:4263a77256ae 64 tmp |= 0x1 << (i << 1);
bogdanm 20:4263a77256ae 65 }
bogdanm 20:4263a77256ae 66 }
bogdanm 20:4263a77256ae 67 }
bogdanm 20:4263a77256ae 68 *obj->reg_mode = tmp;
bogdanm 20:4263a77256ae 69 }
bogdanm 20:4263a77256ae 70
bogdanm 20:4263a77256ae 71 void port_write(port_t *obj, int value) {
bogdanm 20:4263a77256ae 72 *obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
bogdanm 20:4263a77256ae 73 }
bogdanm 20:4263a77256ae 74
bogdanm 20:4263a77256ae 75 int port_read(port_t *obj) {
bogdanm 20:4263a77256ae 76 switch (obj->direction) {
bogdanm 20:4263a77256ae 77 case PIN_OUTPUT: return *obj->reg_out & obj->mask;
bogdanm 20:4263a77256ae 78 case PIN_INPUT: return *obj->reg_in & obj->mask;
bogdanm 20:4263a77256ae 79 }
bogdanm 20:4263a77256ae 80 return 0;
bogdanm 20:4263a77256ae 81 }
bogdanm 20:4263a77256ae 82
bogdanm 20:4263a77256ae 83 #endif