350 lines
12 KiB
C
350 lines
12 KiB
C
#include "iic.h"
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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void iic_delay_us(uint16 x) //33.1776Mhz
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{
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uint8 i;
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while(x--)
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{
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i = 9;
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while (--i);
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}
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 wait(void)
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{
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uint16 count = 0;
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uint8 ret = IIC_SEND_OK;
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while (!(I2CMSST & 0x40))
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{
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iic_delay_us(1);
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if(count++ >= 30)//等待超过30us，则退出等待。
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{
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ret = IIC_SEND_FAIL;
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break;
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}
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}
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I2CMSST &= ~0x40;
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return ret;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 start(void)
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{
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uint8 ret;
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I2CMSCR = 0x01; //发送start命令
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ret = wait();
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return ret;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 send_data(char dat)
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{
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uint8 ret;
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I2CTXD = dat; //写数据到数据缓冲区
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I2CMSCR = 0x02; //发送SEND命令
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ret = wait();
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return ret;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 recv_ack(void)
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{
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uint8 ret;
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I2CMSCR = 0x03; //发送读ACK命令
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ret = wait();
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return ret;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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char recv_data(void) //接收数据
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{
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I2CMSCR = 0x04; //发送RECV命令
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wait();
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return I2CRXD;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 send_ack(void)
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{
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uint8 ret;
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I2CMSST = 0x00; //设置ACK信号
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I2CMSCR = 0x05; //发送ACK命令
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ret = wait();
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return ret;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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void send_nak(void)
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{
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I2CMSST = 0x01; //设置NAK信号
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I2CMSCR = 0x05; //发送ACK命令
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wait();
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 内部使用用户无需关心
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// @param NULL
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// @return void
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// Sample usage: 无需用户调用，用户请使用h文件中的宏定义
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//-------------------------------------------------------------------------------------------------------------------
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uint8 stop(void)
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{
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uint8 ret;
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I2CMSCR = 0x06; //发送stop命令
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ret = wait();
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return ret;
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}
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//#define UNUSED(expr1, expr2) do { if(scl_pin == sda_pin); } while (0)
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 硬件IIC初始化
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// @param iic_n 选择IIC模块
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// @param wait_time I2C总线速度（等待时钟数）控制: 速度设置为等待wait_time*2+1个时钟
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// @return void
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// Sample usage:
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//-------------------------------------------------------------------------------------------------------------------
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void iic_init(IICN_enum iic_n, uint8 wait_time)
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{
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//UNUSED(scl_pin);
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//__attribute__ ((unused))(sda_pin);
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//UNUSED(scl_pin, sda_pin);
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P_SW2 &= ~(0x03<<4);
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P_SW2 |= 1<<7; //将EAXFR寄存器置1，这样才能使用特殊功能寄存器为扩展SFR，访问逻辑地址位于 XDATA 区域
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switch(iic_n)
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{
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case IIC_1:
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P_SW2 |= (0x00<<4); //SCL:P1.5 SDA:P1.4
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break;
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case IIC_2:
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P_SW2 |= (0x01<<4); //SCL:P2.5 SDA:P2.4
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break;
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case IIC_3:
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P_SW2 |= (0x02<<4); //SCL:P7.7 SDA:P7.6
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break;
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case IIC_4:
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P_SW2 |= (0x03<<4); //SCL:P3.2 SDA:P3.3
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break;
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}
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I2CCFG |= 1<<6; //主机模式
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I2CCFG |= 1<<7; //使能IIC
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I2CCFG |= wait_time&0x3F;//速度设置为等待wait_time*2+1个时钟
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I2CMSST = 0x00; //主机状态寄存器
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 写入一个字节数据到I2C设备指定寄存器地址
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// @param iic_n IIC模块(IIC_1,IIC_2,IIC_3,IIC_0)
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// @param slaveid 从机地址(7位地址)
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// @param reg 从机寄存器地址
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// @param dat 需要发送的数据
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// @return 返回的状态值 0：成功 1：失败
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// @since v2.0
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// Sample usage: iic_write_reg(0x2D, 0x50,2); //写入数据2到0x50地址，从机地址为0x2D
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//-------------------------------------------------------------------------------------------------------------------
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uint8 iic_write_reg(uint8 dev_add, uint8 reg, uint8 dat)
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{
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if(start() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data((dev_add<<1) | 0x00) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data(reg) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data(dat) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(stop() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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return IIC_SEND_OK;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 读取I2C设备指定地址寄存器的数据
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// @param iic_n I2C通道号及引脚
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// @param dev_add 从机地址(7位地址)
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// @param reg 从机寄存器地址
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// @param dat 数据地址
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// @return 读取的寄存器值
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// @since v1.0
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// Sample usage: uint8 value = iic_read_reg(i2c0, 0x2D, 0x50);//读取0x50地址的数据，从机地址为0x2D
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//-------------------------------------------------------------------------------------------------------------------
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uint8 iic_read_reg(uint8 dev_add, uint8 reg, uint8 *dat)
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{
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if(start() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data((dev_add<<1) | 0x00) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data(reg) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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// if(start() != IIC_SEND_OK)
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// return IIC_SEND_FAIL;
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if(send_data((dev_add<<1) | 0x01) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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*dat = recv_data(); //读取数据
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if(send_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(stop() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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return IIC_SEND_OK;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 读取I2C设备指定地址寄存器的数据
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// @param iic_n I2C通道号及引脚
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// @param dev_add 从机地址(7位地址)
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// @param reg 从机寄存器地址
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// @param dat 读取的数据存储的地址
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// @param num 读取字节数
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// @return void
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// @since v1.0
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// Sample usage: uint8 value = i2c_read_reg(i2c0, 0x2D, 0x50, 10, buf);//读取0x50地址的数据，从机地址为0x2D开始的10个字节
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//-------------------------------------------------------------------------------------------------------------------
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uint8 iic_read_reg_bytes(uint8 dev_add, uint8 reg
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, uint8 *dat, uint8 num)
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{
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if(start() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data((dev_add<<1) | 0x00) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data(reg) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(send_data((dev_add<<1) | 0x01) != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(recv_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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while(--num)
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{
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*dat = recv_data(); //读取数据
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if(send_ack() != IIC_SEND_OK)
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{
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return IIC_SEND_FAIL;
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}
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dat++;
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}
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*dat = recv_data();
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if(send_ack() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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if(stop() != IIC_SEND_OK)
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return IIC_SEND_FAIL;
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return IIC_SEND_OK;
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}
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//-------------------------------------------------------------------------------------------------------------------
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// @brief 硬件IIC引脚切换函数
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// @param iic_n I2C通道号及引脚
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// @param scl_pin 选择SCL引脚
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// @param sda_pin 选择SDA引脚
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// Sample usage:
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//-------------------------------------------------------------------------------------------------------------------
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void iic_change_pin(IICN_enum iic_n)
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{
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P_SW2 |= 1<<7; //将EAXFR寄存器置1，这样才能使用特殊功能寄存器为扩展SFR，访问逻辑地址位于 XDATA 区域
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P_SW2 &= ~(0x03<<4); //清除引脚切换位
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switch(iic_n)
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{
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case IIC_1:
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P_SW2 |= (0x00<<4); //SCL:P1.5 SDA:P1.4
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break;
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case IIC_2:
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P_SW2 |= (0x01<<4); //SCL:P2.5 SDA:P2.4
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break;
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case IIC_3:
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P_SW2 |= (0x02<<4); //SCL:P7.7 SDA:P7.6
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break;
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case IIC_4:
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P_SW2 |= (0x03<<4); //SCL:P3.2 SDA:P3.3
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break;
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}
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P_SW2 &= ~(1<<7);
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}
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