217 lines
7.5 KiB
C
217 lines
7.5 KiB
C
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#include "Includes.h"
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#if 1
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_master_StatusCheck
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- 函数功能: 状态检测
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- 输入参数: 第几bit; 对应bit上的值
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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static void i2c_master_StatusCheck(uint8_t nbit, uint8_t bitval)
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{
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uint8_t val;
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for(; ;) {
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__read_hw_reg32(I2C_STATUS , val);
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if( bitval == ((val>>nbit)&0x01) ) break;
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}
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}
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_slave_init
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- 函数功能: 初始化i2c SLAVE模式
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- 输入参数: i2c器件地址
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void i2c_slave_init(uint16_t i2cAddR)
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{
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__write_hw_reg32(CPR_CTLAPBCLKEN_GRCTL, 0x8000800);
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__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x400000);
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__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x400040);
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__write_hw_reg32(CPR_I2C_CLK_CTL, 0x110011); //-> i2c_mclk = 16mhz.
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i2c_master_StatusCheck(0, 0);
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__write_hw_reg32(I2C_ENABLE, 0x00);
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__write_hw_reg32(I2C_SAR, i2cAddR);
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__write_hw_reg32(I2C_RX_TL, 0x00);
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__write_hw_reg32(I2C_TX_TL, 0x00);
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__write_hw_reg32(I2C_CON, 0x00);
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__write_hw_reg32(I2C_INTR_EN, (I2C_SLAVE_RX_DONE | I2C_SLAVE_RD_REQ | I2C_SLAVE_RX_FULL | I2C_SLAVE_STOP ));
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__write_hw_reg32(I2C_FS_SCL_HCNT, 12);
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__write_hw_reg32(I2C_FS_SCL_LCNT, 19);
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__write_hw_reg32(I2C_SS_SCL_HCNT, 72);
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__write_hw_reg32(I2C_SS_SCL_LCNT, 79);
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i2c_master_StatusCheck(0, 0);
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__write_hw_reg32(I2C_ENABLE, 0x1);
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NVIC_EnableIRQ(I2C_IRQn);
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}
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#define SELVE_ADDRESS 0xA0
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: I2C_Handler
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- 函数功能: I2C中断处理函数
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- 输入参数: 无
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void I2C_Handler(void)
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{
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uint32_t stat, VAL;
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__read_hw_reg32(I2C_INTR_STAT, stat);
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printf("stat=%#x =>",stat); //if(stat == 0) return; //if(stat & 0x200) __read_hw_reg32(I2C_CLR_STOP_DET, VAL);//-读 此 寄 存 器 清 除 中 断STOP_DET //if(stat & 0x40) __read_hw_reg32(I2C_CLR_TX_ABRT, VAL); //- 读此寄存器清除中断 TX_ABRT
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__read_hw_reg32(I2C_CLR_INTR, VAL);//- 清除中断 读此寄存器清除组合中断，各个独立中断以及I2C_TX_ABRT_SOURCE 寄存器
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if(stat & 0x80)//RX_DONE-作为 slave 发送数据时，如果master 没有响应的话，在发送最后一个字节后产生此中断，表示发送结束
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{
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printf("RX_DONE--%#x\n",*(I2C_DATA_CMD));
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}
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if(stat & 0x200)//IIC 停止信号 --STOP_DET 结束条件标志 1：总线出现结束条件 0：无效
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{
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printf("STOP_DET--%#x\n",*(I2C_DATA_CMD));
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}
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if(stat & 0x4) //从站收到主站的发送的寄存器地址 (并应答主机的读或写的请求)--RX_FULL RX FIFO 满标志 1：RX FIFO 数据大于或者等于 RX FIFO 阈值。此比特随 FIFO状态自动更新 0：无效
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{
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uint8_t val= *(I2C_DATA_CMD);
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if(val==(1)) //寄存器地址
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{
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*(I2C_DATA_CMD)=0xCC;
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}else if(val==0x02) //寄存器地址
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{
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printf("*****write - %#2x\n",*(I2C_DATA_CMD));
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}
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else
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{
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}
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printf("RX_FULL--%#2x\n",val);
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}
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if(stat & 0x20) //RD_REQ //从站收到主站的再次读请求中断，
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{ //作为 slave，当另外一个 master尝试从 slave 读数据时产生此中断。Slave 保持 I2C 总线为等待状态（SCL=0）直到中断服务被响应。
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//这表示 slave 被远端的master 寻址，并且要求其发送数据。处理器必须响应这个中断，并 将 待 发 送 的 数 据 写 入I2C_DATA_CMD 寄存器
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static uint8_t count=1;
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*(I2C_DATA_CMD)=count;
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printf("RD_REQ--%#x\n",count++);
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}
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}
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void test_slave_i2c()
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{
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//IIC 主机命令1 是读，0是写 空闲状态下IIC 的SCL SDA都为高电平 等待时擎住SCL线到低电平
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gpio_mux_ctl(4,0);gpio_fun_inter(4,0);gpio_fun_sel(4,6);//sda 6:I2C_SDA
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gpio_mux_ctl(5,0);gpio_fun_inter(5,0);gpio_fun_sel(5,5);//scl 5:I2C_SCL
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//i2c_slave_init(0x3D);//IIC上位机侦测的IIC从机地址为0x7A(等于0x3D<<1)
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i2c_slave_init((SELVE_ADDRESS>>1));
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while(1);
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}
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#else
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i2cHandler_callback_t i2cHandler_Callback = (i2cHandler_callback_t)0;
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_slave_init
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- 函数功能: 初始化i2c SLAVE模式
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- 输入参数: i2c器件地址
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void i2c_slave_init(uint16_t i2cAddR)
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{
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__write_hw_reg32(CPR_CTLAPBCLKEN_GRCTL, 0x8000800);
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__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x400000);
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__write_hw_reg32(CPR_RSTCTL_SUBRST_SW, 0x400040);
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__write_hw_reg32(CPR_I2C_CLK_CTL, 0x110011); //-> i2c_mclk = 16mhz.
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__write_hw_reg32(I2C_ENABLE, 0x00);
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__write_hw_reg32(I2C_SAR, i2cAddR);
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__write_hw_reg32(I2C_RX_TL, 0x00);
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__write_hw_reg32(I2C_TX_TL, 0x00);
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__write_hw_reg32(I2C_CON, 0x00);
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__write_hw_reg32(I2C_INTR_EN, (I2C_SLAVE_RX_DONE | I2C_SLAVE_RD_REQ | I2C_SLAVE_RX_FULL | I2C_SLAVE_STOP ));
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__write_hw_reg32(I2C_ENABLE, 0x1);
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NVIC_EnableIRQ(I2C_IRQn);
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}
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_slave_Register_Callback
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- 函数功能: 为i2c从设备注册中断回调函数
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- 输入参数: 中断状态值
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void i2c_slave_Register_Callback(i2cHandler_callback_t callback)
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{
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i2cHandler_Callback = callback;
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}
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_slave_WriteSingle
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- 函数功能: 为i2c从设备发送数据
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- 输入参数: 发送的数据
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void i2c_slave_WriteSingle(uint8_t val)
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{
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__write_hw_reg32(I2C_DATA_CMD, val);
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}
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: i2c_slave_ReadSingle
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- 函数功能: 为i2c从设备获取数据
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- 输入参数: 无
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern uint8_t i2c_slave_ReadSingle(void)
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{
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uint8_t val;
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__read_hw_reg32(I2C_DATA_CMD, val);
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return (val);
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}
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/* ---------------------------------------------------------------------------------------------------
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- 函数名称: I2C_Handler
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- 函数功能: I2C中断处理函数
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- 输入参数: 无
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- 创建日期:
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----------------------------------------------------------------------------------------------------*/
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extern void I2C_Handler(void)
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{
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uint32_t stat, VAL;
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__read_hw_reg32(I2C_INTR_STAT, stat);
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if(stat == 0) return;
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if(stat & 0x200) __read_hw_reg32(I2C_CLR_STOP_DET, VAL);
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if(stat & 0x40) __read_hw_reg32(I2C_CLR_TX_ABRT, VAL);
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__read_hw_reg32(I2C_CLR_INTR, VAL); //- 清除中断
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if(i2cHandler_Callback != (i2cHandler_callback_t)0) {
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i2cHandler_Callback(stat);
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}
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}
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#endif
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