qcc304x笔记之i2c运用（八）

这里以驱动ST的gsensor--lis2dh12为例

流程分析

• 首先根据自己的原理图配置pio，注意这里是16进制显示

• 添加一个task以及注册taskHandler用于管理与外设通讯，将task注册给PioMonitor
• 初始化pio
• 实现中断处理即taskhandler
• 配置gsensor的寄存器

代码实现

gSenorTaskData gSenorTask;

/*pio中断处理函数*/
static void Lis2dh12InterruptHandler(Task task, MessageId id, Message msg)
{
    gSenorTaskData *accel = (gSenorTaskData *)task;

    /* Handle internal messages*/
    switch (id)
    {
        case MESSAGE_PIO_CHANGED:
        {
            const MessagePioChanged *mpc = (const MessagePioChanged *)msg;
            uint32 state = mpc->state16to31 << 16 | mpc->state;
            uint16 bank = PIO2BANK(LIS2DH12_INTERRUPT1_PIO);
            uint32 mask = PIO2MASK(LIS2DH12_INTERRUPT1_PIO);
            if (mpc->bank == bank)
            {
				
            }
        }
            break;
	}
}

/*iic与中断的初始化*/
static void Lis2dh12PioConfig(void)
{
    uint16 bank;
    uint32 mask;

    /* Setup Interrupt as input with weak pull up */
    bank = PIO2BANK(LIS2DH12_INTERRUPT1_PIO);
    mask = PIO2MASK(LIS2DH12_INTERRUPT1_PIO);
    PanicNotZero(PioSetMapPins32Bank(bank, mask, mask));
    PanicNotZero(PioSetDir32Bank(bank, mask, 0));
    /*PanicNotZero(PioSet32Bank(bank, mask, mask));*/
    PanicNotZero(PioSet32Bank(bank, mask, 0));
    
    /* Setup i2c scl as output with weak pull up */
    bank = PIO2BANK(LIS2DH12_SCL_PIO);
    mask = PIO2MASK(LIS2DH12_SCL_PIO);
    PioSetMapPins32Bank(bank, mask, mask);
    PioSetDir32Bank(bank, mask, mask);
    PioSet32Bank(bank, mask, mask);

    /* Setup i2c sda as output with weak pull up */
    bank = PIO2BANK(LIS2DH12_SDA_PIO);
    mask = PIO2MASK(LIS2DH12_SDA_PIO);
    PioSetMapPins32Bank(bank, mask, mask);
    PioSetDir32Bank(bank, mask, mask);
    PioSet32Bank(bank, mask, mask);
}

/*配置gsensor寄存器*/
static void Lis2dh12RegsConfig(void)
{
    uint16 table_length = ARRAY_DIM(lis2dh12_reg_init_table);
    uint16 index = 0;
    uint8 packet[2];
    uint16 ack;

    for(index;index < table_length;index++){
        packet[0] = lis2dh12_reg_init_table[index].reg;
        packet[1] = lis2dh12_reg_init_table[index].reg_val;
        ack = I2cTransfer(LIS2DH12_DEFAULT_ADDRESS_H, packet, 2, NULL, 0);
        PanicZero(ack);
    }

}
/*读gsensor寄存器的值*/
void Lis2dh12RegRead(uint8 reg, uint8 *data, uint16 len)
{
    uint16 ack = 0;
    ack = I2cTransfer(LIS2DH12_DEFAULT_ADDRESS_H, &reg, 1, data, len);
    PanicZero(ack);
}

/*创建一个task(gSenorTask),并将task注册给PioMonitor，这样当中断上来的时候，会发io changed的消息到当前的task*/
static bool GsenorClientRegister(Task client_task)
{
    gSenorTaskData *accel = GsenorGetTaskData();

    if (NULL == accel->client)
    {
        accel->client = TaskList_Create();

        Lis2dh12PioConfig();
        /* Register for interrupt events */
        accel->task.handler = Lis2dh12InterruptHandler;
        PioMonitorRegisterTask(&accel->task, LIS2DH12_INTERRUPT1_PIO);

        /*MessageSend(client_task, getMessage(PioGet32Bank(PIO2BANK(LIS2DH12_INTERRUPT1_PIO)), PIO2MASK(LIS2DH12_INTERRUPT1_PIO)), NULL);*/

        return TaskList_AddTask(accel->client, client_task);
    }
    return FALSE;
}

注意这里用的i2c通讯接口（I2cTransfer）为低速接口，高速接口请参考touchpad使用的高速通讯接口（BitserialChangeParam—BitserialTransfer--BitserialRead）

 

相关的工具资料等，请到我的博客<qcc514x_qcc304x开发调试笔记>最下面的网盘链接中下载。

本文地址：https://blog.csdn.net/ylangeia/article/details/107287431