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targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/pinmap_function.c
- Committer:
- mbed_official
- Date:
- 2015-11-04
- Revision:
- 15:a81a8d6c1dfe
- Child:
- 18:da299f395b9e
File content as of revision 15:a81a8d6c1dfe:
/* 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 = NC; if (pin == NC) return 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 = 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 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 = 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)]; } /** 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 NC; }