Thomas Moore
7 years ago
committed by
Scott Lahteine
Scott Lahteine
19 changed files with 430 additions and 291 deletions
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/**
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* Marlin 3D Printer Firmware |
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* Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* |
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* Based on Sprinter and grbl. |
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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*/ |
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/**
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* Software SPI functions originally from Arduino Sd2Card Library |
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* Copyright (C) 2009 by William Greiman |
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*/ |
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/**
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* |
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* For TARGET_LPC1768 |
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*/ |
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#include "src/inc/MarlinConfig.h" |
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#ifdef TARGET_LPC1768 |
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// --------------------------------------------------------------------------
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// Software SPI
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// --------------------------------------------------------------------------
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/**
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* This software SPI runs at multiple rates. The SD software provides an index |
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* (spiRate) of 0-6. The mapping is: |
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* 0 - about 5 MHz peak (6 MHz on LPC1769) |
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* 1-2 - about 2 MHz peak |
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* 3 - about 1 MHz peak |
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* 4 - about 500 kHz peak |
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* 5 - about 250 kHz peak |
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* 6 - about 125 kHz peak |
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*/ |
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uint8_t swSpiTransfer(uint8_t b, uint8_t spi_speed, pin_t sck_pin, pin_t miso_pin, pin_t mosi_pin) { |
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for (uint8_t i = 0; i < 8; i++) { |
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if (spi_speed == 0) { |
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if (b & 0x80) |
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WRITE(mosi_pin, HIGH); |
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else |
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WRITE(mosi_pin, LOW); |
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WRITE(sck_pin, HIGH); |
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b <<= 1; |
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if (miso_pin >= 0) |
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if (READ(miso_pin)) b |= 1; |
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WRITE(sck_pin, LOW); |
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} |
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else { |
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if (b & 0x80) |
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for (uint8_t j = 0; j < spi_speed; j++) |
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WRITE(mosi_pin, HIGH); |
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else |
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for (uint8_t j = 0; j < spi_speed; j++) |
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WRITE(mosi_pin, LOW); |
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for (uint8_t j = 0; j < spi_speed + (miso_pin >= 0 ? 0 : 1); j++) |
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WRITE(sck_pin, HIGH); |
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b <<= 1; |
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if (miso_pin >= 0) |
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if (READ(miso_pin)) b |= 1; |
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for (uint8_t j = 0; j < spi_speed; j++) |
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WRITE(sck_pin, LOW); |
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} |
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} |
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return b; |
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} |
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void swSpiBegin(pin_t sck_pin, pin_t miso_pin, pin_t mosi_pin) { |
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SET_OUTPUT(sck_pin); |
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if (VALID_PIN(miso_pin)) |
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SET_INPUT(miso_pin); |
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SET_OUTPUT(mosi_pin); |
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} |
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uint8_t swSpiInit(uint8_t spiRate, pin_t sck_pin, pin_t mosi_pin) { |
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uint8_t spi_speed = 0; |
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spiRate = MIN(spiRate, 6); |
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if (SystemCoreClock == 120000000) |
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spi_speed = 44 / POW(2, 6 - spiRate); |
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else |
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spi_speed = 38 / POW(2, 6 - spiRate); |
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WRITE(mosi_pin, HIGH); |
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WRITE(sck_pin, LOW); |
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return spi_speed; |
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} |
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#endif // TARGET_LPC1768
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@ -0,0 +1,50 @@ |
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/**
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* Marlin 3D Printer Firmware |
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* |
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* Based on Sprinter and grbl. |
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm |
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* |
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* This program is free software: you can redistribute it and/or modify |
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|
* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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|
* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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*/ |
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#ifndef _SOFTWARE_SPI_H_ |
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#define _SOFTWARE_SPI_H_ |
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#include "pinmapping.h" |
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// --------------------------------------------------------------------------
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// software SPI
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// --------------------------------------------------------------------------
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/**
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* This software SPI runs at multiple rates. The SD software provides an index |
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* (spiRate) of 0-6. The mapping is: |
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* 0 - about 5 MHz peak (6 MHz on LPC1769) |
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* 1-2 - about 2 MHz peak |
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* 3 - about 1 MHz peak |
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* 4 - about 500 kHz peak |
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* 5 - about 250 kHz peak |
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* 6 - about 125 kHz peak |
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*/ |
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void swSpiBegin(pin_t sck_pin, pin_t miso_pin, pin_t mosi_pin); |
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// Returns the spi_speed value to be passed to swSpiTransfer
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uint8_t swSpiInit(uint8_t spiRate, pin_t sck_pin, pin_t mosi_pin); |
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uint8_t swSpiTransfer(uint8_t b, uint8_t spi_speed, pin_t sck_pin, pin_t miso_pin, pin_t mosi_pin); |
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#endif // _SOFTWARE_SPI_H_
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