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282 lines
8.1 KiB
282 lines
8.1 KiB
/**
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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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* 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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#include "../inc/MarlinConfig.h"
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#if ENABLED(IIC_BL24CXX_EEPROM)
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/**
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* PersistentStore for Arduino-style EEPROM interface
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* with simple implementations supplied by Marlin.
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*/
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#include "BL24CXX.h"
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#ifdef __STM32F1__
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#include <libmaple/gpio.h>
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#else
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#include "../HAL/shared/Delay.h"
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#define delay_us(n) DELAY_US(n)
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#endif
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#ifndef EEPROM_WRITE_DELAY
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#define EEPROM_WRITE_DELAY 10
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#endif
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#ifndef EEPROM_DEVICE_ADDRESS
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#define EEPROM_DEVICE_ADDRESS (0x50 << 1)
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#endif
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// IO direction setting
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#ifdef __STM32F1__
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#define SDA_IN() do{ PIN_MAP[IIC_EEPROM_SDA].gpio_device->regs->CRH &= 0XFFFF0FFF; PIN_MAP[IIC_EEPROM_SDA].gpio_device->regs->CRH |= 8 << 12; }while(0)
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#define SDA_OUT() do{ PIN_MAP[IIC_EEPROM_SDA].gpio_device->regs->CRH &= 0XFFFF0FFF; PIN_MAP[IIC_EEPROM_SDA].gpio_device->regs->CRH |= 3 << 12; }while(0)
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#elif STM32F1
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#define SDA_IN() SET_INPUT(IIC_EEPROM_SDA)
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#define SDA_OUT() SET_OUTPUT(IIC_EEPROM_SDA)
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#endif
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// IO ops
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#define IIC_SCL_0() WRITE(IIC_EEPROM_SCL, LOW)
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#define IIC_SCL_1() WRITE(IIC_EEPROM_SCL, HIGH)
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#define IIC_SDA_0() WRITE(IIC_EEPROM_SDA, LOW)
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#define IIC_SDA_1() WRITE(IIC_EEPROM_SDA, HIGH)
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#define READ_SDA() READ(IIC_EEPROM_SDA)
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//
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// Simple IIC interface via libmaple
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//
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// Initialize 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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// Generate IIC start signal
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void IIC::start() {
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SDA_OUT(); // SDA line output
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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 from high to low
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delay_us(4);
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IIC_SCL_0(); // Clamp the I2C bus, ready to send or receive data
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}
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// Generate IIC stop signal
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void IIC::stop() {
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SDA_OUT(); // SDA line output
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IIC_SCL_0();
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IIC_SDA_0(); // STOP:when CLK is high DATA change from low to high
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delay_us(4);
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IIC_SCL_1();
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IIC_SDA_1(); // Send I2C bus end signal
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delay_us(4);
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}
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// Wait for the response signal to arrive
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// 1 = failed to receive response
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// 0 = response received
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uint8_t IIC::wait_ack() {
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uint8_t ucErrTime = 0;
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SDA_IN(); // SDA is set as input
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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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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(); // Clock output 0
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return 0;
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}
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// Generate ACK response
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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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// No ACK response
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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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// Send one IIC byte
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// Return whether the slave responds
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// 1 = there is a response
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// 0 = no response
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void IIC::send_byte(uint8_t txd) {
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SDA_OUT();
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IIC_SCL_0(); // Pull down the clock to start data transmission
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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); // All three delays are necessary for TEA5767
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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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// Read 1 byte, when ack=1, send ACK, ack=0, send 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 is set as input
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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(); // Send ACK / send nACK
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return receive;
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}
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/******************** EEPROM ********************/
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// Initialize the IIC interface
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void BL24CXX::init() { IIC::init(); }
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// Read a byte at the specified address
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// ReadAddr: the address to start reading
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// Return: the byte read
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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(EEPROM_DEVICE_ADDRESS); // Send write command
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IIC::wait_ack();
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IIC::send_byte(ReadAddr >> 8); // Send high address
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IIC::wait_ack();
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}
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else
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IIC::send_byte(EEPROM_DEVICE_ADDRESS + ((ReadAddr >> 8) << 1)); // Send device address 0xA0, write data
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IIC::wait_ack();
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IIC::send_byte(ReadAddr & 0xFF); // Send low address
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IIC::wait_ack();
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IIC::start();
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IIC::send_byte(EEPROM_DEVICE_ADDRESS | 0x01); // Send byte
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IIC::wait_ack();
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temp = IIC::read_byte(0);
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IIC::stop(); // Generate a stop condition
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return temp;
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}
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// Write a data at the address specified by BL24CXX
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// WriteAddr: The destination address for writing data
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// DataToWrite: the data to be written
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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(EEPROM_DEVICE_ADDRESS); // Send write command
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IIC::wait_ack();
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IIC::send_byte(WriteAddr >> 8); // Send high address
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}
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else
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IIC::send_byte(EEPROM_DEVICE_ADDRESS + ((WriteAddr >> 8) << 1)); // Send device address 0xA0, write data
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IIC::wait_ack();
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IIC::send_byte(WriteAddr & 0xFF); // Send low address
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IIC::wait_ack();
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IIC::send_byte(DataToWrite); // Receiving mode
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IIC::wait_ack();
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IIC::stop(); // Generate a stop condition
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delay(10);
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}
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// Start writing data of length Len at the specified address in BL24CXX
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// This function is used to write 16bit or 32bit data.
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// WriteAddr: the address to start writing
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// DataToWrite: the first address of the data array
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// Len: The length of the data to be written 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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// Start reading data of length Len from the specified address in BL24CXX
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// This function is used to read 16bit or 32bit data.
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// ReadAddr: the address to start reading
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// Return value: data
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// Len: The length of the data to be read 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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// Check if BL24CXX is normal
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// Return 1: Detection failed
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// return 0: detection is successful
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#define BL24CXX_TEST_ADDRESS 0x00
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#define BL24CXX_TEST_VALUE 0x55
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bool BL24CXX::_check() {
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return (readOneByte(BL24CXX_TEST_ADDRESS) != BL24CXX_TEST_VALUE); // false = success!
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}
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bool BL24CXX::check() {
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if (_check()) { // Value was written? Good EEPROM!
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writeOneByte(BL24CXX_TEST_ADDRESS, BL24CXX_TEST_VALUE); // Write now and check.
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return _check();
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}
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return false; // success!
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}
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// Start reading the specified number of data at the specified address in BL24CXX
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// ReadAddr: The address to start reading is 0~255 for 24c02
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// pBuffer: the first address of the data array
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// NumToRead: the number of data to be read
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void BL24CXX::read(uint16_t ReadAddr, uint8_t *pBuffer, uint16_t NumToRead) {
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for (; NumToRead; NumToRead--)
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*pBuffer++ = readOneByte(ReadAddr++);
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}
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// Start writing the specified number of data at the specified address in BL24CXX
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// WriteAddr: the address to start writing, 0~255 for 24c02
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// pBuffer: the first address of the data array
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// NumToWrite: the number of data to be written
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void BL24CXX::write(uint16_t WriteAddr, uint8_t *pBuffer, uint16_t NumToWrite) {
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for (; NumToWrite; NumToWrite--, WriteAddr++)
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writeOneByte(WriteAddr, *pBuffer++);
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}
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#endif // IIC_BL24CXX_EEPROM
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