IIC从机



  • 能否提供一个IIC作为从机的代码



  • void iic_init(enum iic_channel_t channel, uint16_t speed, uint16_t slave_addr)
    {
    volatile struct iic_reg_t *iic_reg;

    if(channel == IIC_CHANNEL_0)
    {
        iic_reg = IIC0_REG_BASE;
    }
    else
    {
        iic_reg = IIC1_REG_BASE;
    }
    
    iic_reg->clkdiv.clk_div = (system_get_pclk_config()*1000/speed-10)/2;
    iic_reg->control.soft_reset = 1;
    iic_reg->control.seven_bit = 1;
    iic_reg->address.slv_addr = slave_addr;
    
    iic_byte_period[channel] = 1000/speed + 1;
    //enable interrupt
    iic_reg->control.rec_noemp_ie = 1;//接收fifo非空中断
    iic_reg->control.slv_noful_ie = 1;//从机发送fifo不满中断
    NVIC_EnableIRQ(IIC0_IRQn);
    

    }

    void iic0_isr(void)
    {
    volatile struct iic_reg_t *iic_reg = IIC0_REG_BASE;
    uint8_t data;

    if(iic_reg->status.rec_emp == 0)//接收fifo非空
    {
        iic_test_reg_addr = iic_reg->data;//从机接收数据
    	co_printf("%d rec_data =  %d   \r\n",iic_master_data_rx_cnt++,iic_test_reg_addr);
    }
    else if(iic_reg->status.slv_trans_ful ==0){//从机发送fifo不满
    	while(iic_reg->status.slv_trans_ful ==0){
    		data = rand() & 0xFF;//从机发送随机数据
    		iic_reg->slavedata.slave_data = data;//iic_slave_data_Tx_buffer[iic_slave_data_Tx_cnt++];
    		 co_printf("send %d.\r\n", data);
    
    	}
    }
    

    }