363 lines
6.1 KiB
C
363 lines
6.1 KiB
C
///Copyright (c) 2022, 四川汇源光通信有限公司
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///All rights reserved.
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///@file mb85rc64.h
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///@brief mb85rc64驱动程序 铁电存储器
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///
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///@details
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///@note
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///@author lqc
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///@date 2022/05/26
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///
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///@version v1.0 2022/05/26 初始版本
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#include "mb85rc64.h"
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/*
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@ brief 延时函数
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@ param
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@ return
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@ note 2022-5-23
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*/
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static void delay_us(int us)
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{
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for(int i = 0; i < us; i++ )
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{
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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}
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}
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/*
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@ brief 芯片初始化
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@ param
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@ return
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@ note 2022-05-26
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*/
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void mb85rc64_gpio_init()
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{
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//配置引脚时钟
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rcu_periph_clock_enable(RCU_GPIOB);
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//设置引脚为输出模式:PB6
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gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_6);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6);
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//设置引脚PB7输出模式
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gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_7);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
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MB85RC64_SCL_HIGH;
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MB85RC64_SDA_HIGH;
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}
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/*
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@ brief 设置SDA引脚为输出模式
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@ param
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@ return
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@ note 2022-5-26 lqc
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*/
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static void mb85rc64_sda_output()
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{
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gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_7);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
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MB85RC64_SDA_HIGH;
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}
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/*
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@ brief 设置SDA引脚为输入模式
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@ param
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@ return
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@ note 2022-5-26 lqc
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*/
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static void mb85rc64_sda_input()
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{
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gpio_mode_set(GPIOB, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, GPIO_PIN_7);
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gpio_output_options_set(GPIOB, GPIO_PUPD_NONE, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
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}
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/*
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@ brief I2C start信号
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@ param
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@ return
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@ note 2022-5-25
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*/
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static void i2c_start()
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{
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MB85RC64_SDA_HIGH;
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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MB85RC64_SDA_LOW;
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delay_us(4);
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}
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/*
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@ brief I2C stop信号
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@ param
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@ return
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@ note 2022-05-25
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*/
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static void i2c_stop()
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{
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MB85RC64_SDA_LOW;
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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MB85RC64_SDA_HIGH;
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delay_us(4);
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}
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/*
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@ brief mb85rc64接收数据产生ACK信号
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@ param SDA被从设备拉为低电平表示应答
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@ return
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@ note 2022-05-26
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*/
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static void mb85rc64_ack()
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{
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int i = 0;
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mb85rc64_sda_input();
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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while((MB85RC64_SDA_GET) && i<1000)
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{
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i++;
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}
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delay_us(5);
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MB85RC64_SCL_LOW;
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delay_us(5);
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mb85rc64_sda_output();
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}
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/*
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@ brief 主机读取数据发送ACK信号,SDA为低电平
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@ param SCL下降沿发送
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@ return
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@ note 2022-05-26
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*/
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static void master_ack()
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{
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MB85RC64_SDA_LOW;
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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MB85RC64_SCL_LOW;
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delay_us(5);
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}
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/*
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@ brief 主机读取数据完毕，发送no_ack信号，SDA为高电平
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@ param
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@ return
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@ note 2022-05-26
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*/
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static void master_no_ack()
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{
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MB85RC64_SDA_HIGH;
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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MB85RC64_SCL_LOW;
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delay_us(5);
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}
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/*
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@ brief 写一个字节数据
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@ param
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@ return
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@ note 2022-05-26
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*/
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static void mb85rc64_write_byte(uint8_t byte)
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{
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for(int i = 0; i < 8; i++)
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{
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MB85RC64_SCL_LOW;
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delay_us(5);
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if(byte & 0x80)
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{
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MB85RC64_SDA_HIGH;
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}
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else
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{
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MB85RC64_SDA_LOW;
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}
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MB85RC64_SCL_HIGH;
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delay_us(5);
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byte <<= 1;
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}
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MB85RC64_SCL_LOW;
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}
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/*
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@ brief 读一个字节数据
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@ param
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@ return
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@ note 2022-05-26
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*/
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static uint8_t mb85rc64_read_byte()
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{
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uint8_t value = 0;
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MB85RC64_SCL_LOW;
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delay_us(5);
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mb85rc64_sda_input();
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for(int i = 0; i < 8; i++)
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{
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value <<= 1;
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MB85RC64_SCL_LOW;
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delay_us(5);
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MB85RC64_SCL_HIGH;
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delay_us(5);
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if(MB85RC64_SDA_GET)
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{
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value = value | 0x01;
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}
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else {
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value = value & 0xfe;
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}
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}
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MB85RC64_SCL_LOW;
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delay_us(5);
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mb85rc64_sda_output();
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return value;
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}
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/*
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@ brief 保存数据，页写
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@ param addr:保存数据的地址，data:需保存的数据，data_len：保存数据的长度
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@ return
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@ note 2022-05-27
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*/
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char mb85rc64_page_write(unsigned short int addr, unsigned char* data, int data_len)
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{
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uint8_t addr_H = 0;
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uint8_t addr_L = 0;
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addr_H = (addr >> 8) & 0x00ff;
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addr_L = addr & 0x00ff;
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//启动信号
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i2c_start();
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//写地址,R/W位=0
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mb85rc64_write_byte(MB85RC64_ADDRESS_WRITE);
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//ack信号
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mb85rc64_ack();
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//写高8位地址
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mb85rc64_write_byte(addr_H);
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//ack信号
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mb85rc64_ack();
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//写低8位地址
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mb85rc64_write_byte(addr_L);
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//ack信号
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mb85rc64_ack();
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for(int i = 0; i < data_len; i++)
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{
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mb85rc64_write_byte(*data);
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mb85rc64_ack();
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data++;
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}
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//停止信号
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i2c_stop();
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return 1;
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}
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/*
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@ brief 读取数据 ，顺序读取，指定地址，连续接收数据
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@ param addr :需要读取数据的地址，data:数据, data_len:数据长度
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@ return
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@ note 2022-05-27 lqc
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*/
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char mb85rc64_add_read(unsigned short int addr, unsigned char *data, int data_len)
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{
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uint8_t addr_H = 0;
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uint8_t addr_L = 0;
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addr_H = (addr >> 8) & 0x00ff;
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addr_L = addr & 0x00ff;
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//启动信号
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i2c_start();
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//写地址，R/W位为0
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mb85rc64_write_byte(MB85RC64_ADDRESS_WRITE);
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//ack信号
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mb85rc64_ack();
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//写高8位地址
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mb85rc64_write_byte(addr_H);
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//ack信号
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mb85rc64_ack();
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//写低8位地址
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mb85rc64_write_byte(addr_L);
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//ack信号
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mb85rc64_ack();
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//启动信号
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i2c_start();
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//写地址，R/W为为1，读数据
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mb85rc64_write_byte(MB85RC64_ADDRESS_READ);
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//ack信号
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mb85rc64_ack();
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for(int i = 0; i < data_len; i++)
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{
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//读数据
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data[i] = mb85rc64_read_byte();
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if(i == data_len - 1)
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{
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master_no_ack();
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}
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else
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{
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master_ack();
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}
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}
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//停止信号
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i2c_stop();
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return 1;
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}
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void read_mb_id(uint8_t* buff)
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{
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i2c_start();
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mb85rc64_write_byte(0xf8);
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mb85rc64_ack();
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mb85rc64_write_byte(MB85RC64_ADDRESS_WRITE);
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mb85rc64_ack();
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i2c_start();
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mb85rc64_write_byte(0xf9);
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mb85rc64_ack();
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for(int i = 0; i < 3; i++)
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{
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//读数据
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buff[i] = mb85rc64_read_byte();
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if(i == 3 - 1)
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{
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master_no_ack();
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}
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else
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{
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master_ack();
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}
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}
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i2c_stop();
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}
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