[136] | 1 | /*
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| 2 | * Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
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| 3 | * SPI Master library for arduino.
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| 4 | *
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| 5 | * This file is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of either the GNU General Public License version 2
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| 7 | * or the GNU Lesser General Public License version 2.1, both as
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| 8 | * published by the Free Software Foundation.
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| 9 | */
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| 10 |
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| 11 | #include "SPI.h"
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| 12 | #include "wiring_digital.h"
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| 13 | #include "assert.h"
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| 14 | #include "variant.h"
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| 15 |
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| 16 | SPIClass::SPIClass(SERCOM *p_sercom, uint8_t uc_pinMISO, uint8_t uc_pinSCK, uint8_t uc_pinMOSI)
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| 17 | {
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| 18 | assert(p_sercom != NULL );
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| 19 | _p_sercom = p_sercom;
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| 20 |
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| 21 | _uc_pinMiso = uc_pinMISO;
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| 22 | _uc_pinSCK = uc_pinSCK;
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| 23 | _uc_pinMosi = uc_pinMOSI;
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| 24 | }
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| 25 |
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| 26 | void SPIClass::begin()
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| 27 | {
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| 28 | // PIO init
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| 29 | pinPeripheral(_uc_pinMiso, g_APinDescription[_uc_pinMiso].ulPinType);
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| 30 | pinPeripheral(_uc_pinSCK, g_APinDescription[_uc_pinSCK].ulPinType);
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| 31 | pinPeripheral(_uc_pinMosi, g_APinDescription[_uc_pinMosi].ulPinType);
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| 32 |
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| 33 | // Default speed set to 4Mhz, SPI mode set to MODE 0 and Bit order set to MSB first.
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| 34 | _p_sercom->initSPI(SPI_PAD_2_SCK_3, SERCOM_RX_PAD_0, SPI_CHAR_SIZE_8_BITS, MSB_FIRST);
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| 35 | _p_sercom->initSPIClock(SERCOM_SPI_MODE_0, 4000000);
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| 36 |
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| 37 | _p_sercom->enableSPI();
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| 38 | }
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| 39 |
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| 40 | void SPIClass::end()
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| 41 | {
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| 42 | _p_sercom->resetSPI();
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| 43 | }
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| 44 |
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| 45 | void SPIClass::setBitOrder(BitOrder order)
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| 46 | {
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| 47 | if(order == LSBFIRST)
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| 48 | _p_sercom->setDataOrderSPI(LSB_FIRST);
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| 49 | else
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| 50 | _p_sercom->setDataOrderSPI(MSB_FIRST);
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| 51 | }
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| 52 |
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| 53 | void SPIClass::setDataMode(uint8_t mode)
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| 54 | {
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| 55 | switch(mode)
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| 56 | {
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| 57 | case SPI_MODE0:
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| 58 | _p_sercom->setClockModeSPI(SERCOM_SPI_MODE_0);
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| 59 | break;
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| 60 |
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| 61 | case SPI_MODE1:
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| 62 | _p_sercom->setClockModeSPI(SERCOM_SPI_MODE_1);
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| 63 | break;
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| 64 |
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| 65 | case SPI_MODE2:
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| 66 | _p_sercom->setClockModeSPI(SERCOM_SPI_MODE_2);
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| 67 | break;
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| 68 |
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| 69 | case SPI_MODE3:
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| 70 | _p_sercom->setClockModeSPI(SERCOM_SPI_MODE_3);
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| 71 | break;
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| 72 |
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| 73 | default:
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| 74 | break;
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| 75 | }
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| 76 | }
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| 77 |
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| 78 | void SPIClass::setClockDivider(uint8_t div)
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| 79 | {
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| 80 | _p_sercom->setBaudrateSPI(div);
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| 81 | }
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| 82 |
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| 83 | byte SPIClass::transfer(uint8_t data)
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| 84 | {
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| 85 | //Writing the data
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| 86 | _p_sercom->writeDataSPI(data);
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| 87 |
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| 88 | //Read data
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| 89 | return _p_sercom->readDataSPI();
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| 90 | }
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| 91 |
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| 92 | void SPIClass::attachInterrupt() {
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| 93 | // Should be enableInterrupt()
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| 94 | }
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| 95 |
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| 96 | void SPIClass::detachInterrupt() {
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| 97 | // Should be disableInterrupt()
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| 98 | }
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| 99 |
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| 100 | SPIClass SPI(&sercom4, 18, 20, 21);
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