mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_Atmel/TARGET_SAM_CortexM0P/pinmap_function.c
- Revision:
- 149:156823d33999
- Parent:
- 64:41a834223ea3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_Atmel/TARGET_SAM_CortexM0P/pinmap_function.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,226 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2015 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 "cmsis.h" +#include "mbed_assert.h" +#include "compiler.h" + +#include "pinmap_function.h" + +extern struct pwm_pin_channel pwn_pins[]; + +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 SERCOM peripheral of given pin + * + * Find and return the SERCOM peripheral of input pin, either from default pads, or from extended pads + * @param[in] pin1 First pin + * @param[in] pad_select to select which pad is to be used first to find + * @return SERCOM peripheral if found, else, NC + */ +uint32_t pinmap_find_peripheral_from_pad(PinName pin, enum sercom_pad_selection pad_select) +{ + uint32_t pin_sercom =(uint32_t)NC; + + if (pin == NC) return (uint32_t)NC; + + if (pad_select == SERCOM_USE_EXTENDED_PAD) { + pin_sercom = pinmap_find_peripheral(pin, PinMap_SERCOM_PADEx); + } + if (pin_sercom == (uint32_t)NC) { + pin_sercom = pinmap_find_peripheral(pin, PinMap_SERCOM_PAD); + } + + return pin_sercom; +} + +/** Find the common SERCOM shared by two pins + * + * Finds the common SERCOM index of two input pins. + * Currently uses default pad only + * @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) +{ + uint32_t pin1_sercom, pin2_sercom; + + /* Using default pads for now */ + pin1_sercom = pinmap_find_peripheral_from_pad(pin1, SERCOM_USE_DEFAULT_PAD); + if (pin1_sercom != (uint32_t)NC) { + pin1_sercom &= 0x0F; + } + pin2_sercom = pinmap_find_peripheral_from_pad(pin2, SERCOM_USE_DEFAULT_PAD); + if (pin2_sercom != (uint32_t)NC) { + pin2_sercom &= 0x0F; + } + + return pinmap_merge_pins(pin1_sercom, pin2_sercom); +} + +/** Find the common SERCOM shared by four pins + * + * Finds the common SERCOM index shared by four input 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 = (uint32_t)NC; + + sercom_index[0] = pinmap_find_peripheral_from_pad(pin1, SERCOM_USE_DEFAULT_PAD); + sercom_index[1] = pinmap_find_peripheral_from_pad(pin2, SERCOM_USE_DEFAULT_PAD); + sercom_index[2] = pinmap_find_peripheral_from_pad(pin3, SERCOM_USE_DEFAULT_PAD); + sercom_index[3] = pinmap_find_peripheral_from_pad(pin4, SERCOM_USE_DEFAULT_PAD); + + /* Find common SERCOM, if there are conflicts, return NC */ + for (i=0; i<4; i++) { + if (sercom_index[i] != (uint32_t)NC) { + if (pin_com == (uint32_t)NC) { + pin_com = sercom_index[i] & 0x0F; + } else if (pin_com != (sercom_index[i] & 0x0F)) { + return (uint32_t)NC; + } + } + } + + return pin_com; +} + +/** 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 = (uint32_t)NC; + uint32_t index; + sercom_index &= 0x0F; + + if ((pin == NC) || (sercom_index >= SERCOM_INST_NUM)) { + return (uint32_t)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 (uint32_t)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 (uint32_t)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 (uint32_t)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] = { +#if (SAMD21) || (SAMR21) + 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 +#elif (SAML21) + 0x42000000UL, // Base address of SERCOM0 + 0x42000400UL, // Base address of SERCOM1 + 0x42000800UL, // Base address of SERCOM2 + 0x42000C00UL, // Base address of SERCOM3 + 0x42001000UL, // Base address of SERCOM4 + 0x43000400UL // Base address of SERCOM5 +#endif + }; + uint32_t index = sercom_index & 0x0F; + + if (index >= SERCOM_INST_NUM) { + return (uint32_t)NC; + } + return sercom_address[(sercom_index&0x0F)]; +} + +/** Find the channel index of a pin specific to a PWM instance + * + * @param[in] pin pin name + * @param[in] pwm pwm peripheral (unused now) + * @return Channel index of the specified pin + */ +uint32_t pinmap_channel_pwm(PinName pin, PWMName pwm) +{ + struct pwm_pin_channel *pwm_ch = pwn_pins; + + while (pwm_ch->pin != NC) { + if (pin == pwm_ch->pin) { + return (uint32_t)pwm_ch->channel_index; + } + pwm_ch++; + } + return (uint32_t)NC; +}