264 lines
6.9 KiB
C++
264 lines
6.9 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
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*
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*/
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/********************************************************************************
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* @file eeprom_BL24CXX.cpp
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* @brief i2c EEPROM for Ender 3 v2 board (4.2.2)
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********************************************************************************/
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#include "../../inc/MarlinConfig.h"
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#if ENABLED(IIC_BL24CXX_EEPROM)
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#include "eeprom_BL24CXX.h"
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#include "../../MarlinCore.h"
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#include <stdlib.h>
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/******************** IIC ********************/
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// 初始化IIC
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void IIC::init() {
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SET_OUTPUT(IIC_EEPROM_SDA);
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SET_OUTPUT(IIC_EEPROM_SCL);
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IIC_SCL_1();
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IIC_SDA_1();
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}
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// 产生IIC起始信号
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void IIC::start() {
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SDA_OUT(); // sda线输出
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IIC_SDA_1();
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IIC_SCL_1();
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delay_us(4);
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IIC_SDA_0(); // START:when CLK is high, DATA change form high to low
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delay_us(4);
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IIC_SCL_0(); // 钳住I2C总线，准备发送或接收数据
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}
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// 产生IIC停止信号
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void IIC::stop() {
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SDA_OUT(); // sda线输出
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IIC_SCL_0();
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IIC_SDA_0(); // STOP:when CLK is high DATA change form low to high
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delay_us(4);
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IIC_SCL_1();
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IIC_SDA_1(); // 发送I2C总线结束信号
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delay_us(4);
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}
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// 等待应答信号到来
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// 返回值：1，接收应答失败
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// 0，接收应答成功
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uint8_t IIC::wait_ack() {
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uint8_t ucErrTime=0;
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SDA_IN(); // SDA设置为输入
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IIC_SDA_1();delay_us(1);
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IIC_SCL_1();delay_us(1);
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while (READ_SDA()) {
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ucErrTime++;
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if (ucErrTime>250) {
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stop();
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return 1;
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}
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}
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IIC_SCL_0(); // 时钟输出0
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return 0;
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}
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// 产生ACK应答
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void IIC::ack() {
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IIC_SCL_0();
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SDA_OUT();
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IIC_SDA_0();
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delay_us(2);
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IIC_SCL_1();
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delay_us(2);
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IIC_SCL_0();
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}
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// 不产生ACK应答
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void IIC::nAck() {
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IIC_SCL_0();
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SDA_OUT();
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IIC_SDA_1();
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delay_us(2);
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IIC_SCL_1();
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delay_us(2);
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IIC_SCL_0();
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}
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// IIC发送一个字节
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// 返回从机有无应答
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// 1，有应答
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// 0，无应答
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void IIC::send_byte(uint8_t txd) {
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SDA_OUT();
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IIC_SCL_0(); // 拉低时钟开始数据传输
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LOOP_L_N(t, 8) {
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// IIC_SDA = (txd & 0x80) >> 7;
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if (txd & 0x80) IIC_SDA_1(); else IIC_SDA_0();
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txd <<= 1;
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delay_us(2); // 对TEA5767这三个延时都是必须的
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IIC_SCL_1();
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delay_us(2);
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IIC_SCL_0();
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delay_us(2);
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}
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}
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// 读1个字节，ack=1时，发送ACK，ack=0，发送nACK
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uint8_t IIC::read_byte(unsigned char ack_chr) {
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unsigned char receive = 0;
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SDA_IN(); // SDA设置为输入
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LOOP_L_N(i, 8) {
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IIC_SCL_0();
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delay_us(2);
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IIC_SCL_1();
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receive <<= 1;
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if (READ_SDA()) receive++;
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delay_us(1);
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}
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ack_chr ? ack() : nAck(); // 发送ACK / 发送nACK
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return receive;
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}
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/******************** EEPROM ********************/
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// 初始化IIC接口
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void BL24CXX::init() { IIC::init(); }
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// 在BL24CXX指定地址读出一个数据
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// ReadAddr:开始读数的地址
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// 返回值 :读到的数据
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uint8_t BL24CXX::readOneByte(uint16_t ReadAddr) {
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uint8_t temp = 0;
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IIC::start();
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if (EE_TYPE > BL24C16) {
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IIC::send_byte(0xA0); // 发送写命令
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IIC::wait_ack();
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IIC::send_byte(ReadAddr >> 8); // 发送高地址
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IIC::wait_ack();
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}
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else
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IIC::send_byte(0xA0 + ((ReadAddr >> 8) << 1)); // 发送器件地址0xA0,写数据
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IIC::wait_ack();
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IIC::send_byte(ReadAddr & 0xFF); // 发送低地址
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IIC::wait_ack();
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IIC::start();
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IIC::send_byte(0xA1); // 进入接收模式
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IIC::wait_ack();
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temp = IIC::read_byte(0);
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IIC::stop(); // 产生一个停止条件
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return temp;
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}
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// 在BL24CXX指定地址写入一个数据
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// WriteAddr :写入数据的目的地址
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// DataToWrite:要写入的数据
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void BL24CXX::writeOneByte(uint16_t WriteAddr, uint8_t DataToWrite) {
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IIC::start();
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if (EE_TYPE > BL24C16) {
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IIC::send_byte(0xA0); // 发送写命令
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IIC::wait_ack();
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IIC::send_byte(WriteAddr >> 8); // 发送高地址
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}
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else {
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IIC::send_byte(0xA0 + ((WriteAddr >> 8) << 1)); // 发送器件地址0xA0,写数据
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}
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IIC::wait_ack();
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IIC::send_byte(WriteAddr & 0xFF); // 发送低地址
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IIC::wait_ack();
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IIC::send_byte(DataToWrite); // 发送字节
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IIC::wait_ack();
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IIC::stop(); // 产生一个停止条件
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delay(10);
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}
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// 在BL24CXX里面的指定地址开始写入长度为Len的数据
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// 该函数用于写入16bit或者32bit的数据.
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// WriteAddr :开始写入的地址
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// DataToWrite:数据数组首地址
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// Len :要写入数据的长度2,4
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void BL24CXX::writeLenByte(uint16_t WriteAddr, uint32_t DataToWrite, uint8_t Len) {
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LOOP_L_N(t, Len)
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writeOneByte(WriteAddr + t, (DataToWrite >> (8 * t)) & 0xFF);
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}
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// 在BL24CXX里面的指定地址开始读出长度为Len的数据
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// 该函数用于读出16bit或者32bit的数据.
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// ReadAddr :开始读出的地址
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// 返回值 :数据
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// Len :要读出数据的长度2,4
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uint32_t BL24CXX::readLenByte(uint16_t ReadAddr, uint8_t Len) {
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uint32_t temp = 0;
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LOOP_L_N(t, Len) {
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temp <<= 8;
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temp += readOneByte(ReadAddr + Len - t - 1);
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}
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return temp;
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}
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// 检查BL24CXX是否正常
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// 这里用了24XX的最后一个地址(255)来存储标志字.
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// 如果用其他24C系列,这个地址要修改
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// 返回1:检测失败
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// 返回0:检测成功
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uint8_t BL24CXX::check() {
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uint8_t temp;
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temp = readOneByte(255); // 避免每次开机都写BL24CXX
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if (temp == 'U') return 0;
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else { // 排除第一次初始化的情况
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writeOneByte(255, 'U');
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temp = readOneByte(255);
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if (temp == 'U') return 0;
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}
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return 1;
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}
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// 在BL24CXX里面的指定地址开始读出指定个数的数据
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// ReadAddr :开始读出的地址 对24c02为0~255
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// pBuffer :数据数组首地址
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// NumToRead:要读出数据的个数
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void BL24CXX::read(uint16_t ReadAddr, uint8_t *pBuffer, uint16_t NumToRead) {
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while (NumToRead) {
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*pBuffer++ = readOneByte(ReadAddr++);
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NumToRead--;
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}
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}
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// 在BL24CXX里面的指定地址开始写入指定个数的数据
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// WriteAddr :开始写入的地址 对24c02为0~255
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// pBuffer :数据数组首地址
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// NumToWrite:要写入数据的个数
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void BL24CXX::write(uint16_t WriteAddr, uint8_t *pBuffer, uint16_t NumToWrite) {
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while (NumToWrite--) {
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writeOneByte(WriteAddr, *pBuffer);
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WriteAddr++;
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pBuffer++;
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}
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}
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#endif // IIC_BL24CXX_EEPROM
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