129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2019 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 L6470 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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#include "../../inc/MarlinConfig.h"
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#if HAS_DRIVER(L6470)
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#include "Delay.h"
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#include "../../core/serial.h"
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#include "../../libs/L6470/L6470_Marlin.h"
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// Make sure GCC optimizes this file.
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// Note that this line triggers a bug in GCC which is fixed by casting.
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// See the note below.
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#pragma GCC optimize (3)
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// run at ~4Mhz
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uint8_t L6470_SpiTransfer_Mode_0(uint8_t b) { // using Mode 0
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for (uint8_t bits = 8; bits--;) {
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WRITE(L6470_CHAIN_MOSI_PIN, b & 0x80);
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b <<= 1; // little setup time
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WRITE(L6470_CHAIN_SCK_PIN, HIGH);
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DELAY_NS(125); // 10 cycles @ 84mhz
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b |= (READ(L6470_CHAIN_MISO_PIN) != 0);
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WRITE(L6470_CHAIN_SCK_PIN, LOW);
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DELAY_NS(125); // 10 cycles @ 84mhz
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}
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return b;
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}
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uint8_t L6470_SpiTransfer_Mode_3(uint8_t b) { // using Mode 3
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for (uint8_t bits = 8; bits--;) {
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WRITE(L6470_CHAIN_SCK_PIN, LOW);
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WRITE(L6470_CHAIN_MOSI_PIN, b & 0x80);
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DELAY_NS(125); // 10 cycles @ 84mhz
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WRITE(L6470_CHAIN_SCK_PIN, HIGH);
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b <<= 1; // little setup time
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b |= (READ(L6470_CHAIN_MISO_PIN) != 0);
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}
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DELAY_NS(125); // 10 cycles @ 84mhz
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return b;
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}
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/**
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* The following are weak-linked and defined as do-nothing
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* functions by the L6470-Arduino library. They must be
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* defined by the client (Marlin) to provide an SPI interface.
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*/
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uint8_t L6470_transfer(uint8_t data, int16_t ss_pin, const uint8_t chain_position) {
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uint8_t data_out = 0;
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// first device in chain has data sent last
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extDigitalWrite(ss_pin, LOW);
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for (uint8_t i = L6470::chain[0]; (i >= 1) && !spi_abort; i--) { // stop sending data if spi_abort is active
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DISABLE_ISRS(); // disable interrupts during SPI transfer (can't allow partial command to chips)
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uint8_t temp = L6470_SpiTransfer_Mode_3(uint8_t(i == chain_position ? data : dSPIN_NOP));
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ENABLE_ISRS(); // enable interrupts
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if (i == chain_position) data_out = temp;
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}
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extDigitalWrite(ss_pin, HIGH);
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return data_out;
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}
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void L6470_transfer(uint8_t L6470_buf[], const uint8_t length) {
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// first device in chain has data sent last
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if (spi_active) { // interrupted SPI transfer so need to
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WRITE(L6470_CHAIN_SS_PIN, HIGH); // guarantee min high of 650nS
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DELAY_US(1);
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}
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WRITE(L6470_CHAIN_SS_PIN, LOW);
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for (uint8_t i = length; i >= 1; i--)
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L6470_SpiTransfer_Mode_3(uint8_t(L6470_buf[i]));
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WRITE(L6470_CHAIN_SS_PIN, HIGH);
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}
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void L6470_spi_init() {
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OUT_WRITE(L6470_CHAIN_SS_PIN, HIGH);
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OUT_WRITE(L6470_CHAIN_SCK_PIN, HIGH);
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OUT_WRITE(L6470_CHAIN_MOSI_PIN, HIGH);
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SET_INPUT(L6470_CHAIN_MISO_PIN);
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#if PIN_EXISTS(L6470_BUSY)
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SET_INPUT(L6470_BUSY_PIN);
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#endif
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OUT_WRITE(L6470_CHAIN_MOSI_PIN, HIGH);
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}
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#pragma GCC reset_options
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#endif // HAS_DRIVER(L6470)
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