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采用中微BATG135实现IIC数据/指令交互
2022-07-04 06:19:00 【喜欢吃火锅的泪】
本例程是一次项目中使用到IIC实现3台中微直接的数据交互，而中微给出的IIC例程偏向简单，实现中遇到很多问题，要真正实现IIC,需要进行改写。
首先需要进行中微作为从机的初始化：
void IICA0_Init(void)
{
CGC->PER0 |= CGC_PER0_IICA0EN_Msk; /* enables input clock supply */
IICA->IICCTL00 = _00_IICA_OPERATION_STOP; /* stop operation */
INTC_DisableIRQ(IICA_IRQn); /* disable INTIICA interrupt flag */
INTC_ClearPendingIRQ(IICA_IRQn); /* clear INTIICA interrupt flag */#ifdef IICA_STANDARD_MODE /* Max rate: 100Kbps */
IICA->IICCTL01 = _00_IICA_OPERATE_STANDARD; /* operates in standard mode */
IICA->IICWL0 = _4B_IICA_LOW_WIDTH;
IICA->IICWH0 = _53_IICA_HIGH_WIDTH;
#endif
#ifdef IICA_FAST_MODE /* Max rate: 400Kbps */
IICA->IICCTL01 = _08_IICA_OPERATE_FAST; /* operates in fast mode */
IICA->IICCTL01 |= _04_IICA_FILTER_ON; /* filter on */
IICA->IICWL0 = _14_IICA_LOW_WIDTH;
IICA->IICWH0 = _12_IICA_HIGH_WIDTH;
#endif
IICA->IICCTL01 |= _01_IICA_FCLK_2_SELECTED;
IICA->SVA0 = _98_IICA0_SLAVEADDRESS;
IICA->IICF0 |= _02_IICA_WITHOUT_DETECTION; /* enable generation of a start condition without detecting a stop
condition */
IICA->IICF0 |= _01_IICA_RESERVATION_DISABLE; /* disable communication reservation */
IICA->IICCTL00 |= _08_IICA_INTERRUPT_REQUEST_NINTH; /* interrupt request is generated at the ninth clock's falling edge */
IICA->IICCTL00 |= _00_IICA_ACKOWNLEDGMENT_DISABLE; /* enable acknowledgment */
IICA->IICCTL00 |= _80_IICA_OPERATION_ENABLE; /* enable operation */
IICA->IICCTL00 |= _40_IICA_OPERATION_STANDBY; /* this exits from the current communications and sets standby mode */
INTC_EnableIRQ(IICA_IRQn); /* enable INTIICA interrupt flag *//* Set SCLA0, SDAA0 pin */
SCLA0_PORT_SETTING();
SDAA0_PORT_SETTING();
}
其中：可根据中微的GPIO口进行IIC管脚映射
#define SCLA0_PORT_SETTING() do{ \
PORT->SCLA0PCFG = 0x13; /* allocate SCLA0 to P30 */ \
PORT->P3 &= ~(1 << 0); /* P30 output low level */ \
PORT->PM3 &= ~(1 << 0); /* P30 is N-ch open-drain output mode */ \
PORT->PMC3 &= ~(1 << 0); /* P30 digital function */ \
}while(0)/* ToDo: You can allocate the SDA00 to any desired pins with SDA00PCFG register */
#define SDAA0_PORT_SETTING() do{ \
PORT->SDAA0PCFG = 0x17; /* allocate SDAA0 to P50 */ \
PORT->P5 &= ~(1 << 0); /* P50 output low level */ \
PORT->PM5 &= ~(1 << 0); /* P50 is used as SDAA0 inout */ \
PORT->PMC5 &= ~(1 << 0); /* P50 digital function */ \
}while(0)
接下来是中微作为从机，实现数据的收发：
void IIC_Rec_Fuction(void)
{
static uint8_t times = 0;
static uint16_t interval = 0;
uint8_t csc = 0;
if (0 == times)
{
times = 1;
g_iica0_rx_len = 200;
g_iica0_rx_cnt = 0U;
g_iica0_rx_end = 0;
g_iica0_slave_status_flag = 0U;
IICA->IICA0 = SLVADDR_98U; /* slave address */
interval = gMillisecondTick;
}
if (1 == times)
{
if (((gMillisecondTick - interval) & 0xFFFF) > 10) //10ms
{
if ((g_iica0_rx_end == 1) && (RxBuffer2[0] == 0x55) && (RxBuffer2[1] == 0xAA) && (RxBuffer2[2] != 0x00))
{
for(uint16_t i = 0; i < (RxBuffer2[2] + 1);i++ )
{
csc ^= RxBuffer2[i];
}
if(csc == RxBuffer2[RxBuffer2[2] + 1])
{
Sys_Data.CmdData = (RxBuffer2[4]<<8) + RxBuffer2[5]; /*获取功能指令*/
memcpy(Sys_Data.Rec_Data,RxBuffer2,sizeof(RxBuffer2)); /*获取接收数据*/
//Sys_Data.Rec_Data为结构体数组：200个字节uint8_t Rec_Data[200]; /*接收数组*/，到此处代表接收的数据没有问题可进入
/*IIC接收函数处理中*/
Rev_Process_Fuction();
Send_Process_Connect_Upload(); /*IIC发送数据线程*/
g_iica0_rx_len = 200;
g_iica0_rx_cnt = 0U;
g_iica0_rx_end = 0;
g_iica0_slave_status_flag = 0U;
IICA->IICA0 = SLVADDR_98U; /* slave address */
}
}
interval = gMillisecondTick;
}
}else
{
g_iica0_rx_len = 200;
g_iica0_rx_cnt = 0U;
g_iica0_rx_end = 0;
g_iica0_slave_status_flag = 0U;
IICA->IICA0 = SLVADDR_98U; /* slave address */
}
}
其中：需要注意的是，要记得修改中微官方给的中断函数：
uint8_t RxBuffer2[200]; /*接收数组*/
uint16_t RxCounter2 = 0; /*接收计数*//***********************************************************************************************************************
* Function Name: iica0_slavehandler
* @brief This function is IICA0 slave handler.
* @param None
* @return None
***********************************************************************************************************************/
static void iica0_slavehandler(void)
{
/* Control for stop condition */
if (IICA->IICS0 & IICA_IICS0_SPD_Msk)
{
/* Get stop condition */
IICA->IICCTL00 &= ~IICA_IICCTL00_SPIE_Msk; /* SPIE0 = 0: disable */
if(g_iica0_slave_status_flag & _80_IICA_ADDRESS_COMPLETE)
{
if (g_iica0_slave_status_flag & 0x04U) /* send flag */
{
iica0_callback_slave_sendend();
}
if (g_iica0_slave_status_flag & 0x02U) /* receive flag */
{
iica0_callback_slave_receiveend();
}
}
g_iica0_slave_status_flag = 1U;
}
else
{
if ((g_iica0_slave_status_flag & _80_IICA_ADDRESS_COMPLETE) == 0U)
{
if (IICA->IICS0 & IICA_IICS0_COI_Msk)
{
IICA->IICCTL00 |= IICA_IICCTL00_SPIE_Msk; /* SPIE0 = 1: enable */
g_iica0_slave_status_flag = _80_IICA_ADDRESS_COMPLETE;if (IICA->IICS0 & IICA_IICS0_TRC_Msk) /* TRC0 == 1 */
{
IICA->IICCTL00 |= IICA_IICCTL00_WTIM_Msk; /* WTIM0 = 1: interrupt request is generated at the ninth clock's falling edge */if (g_iica0_tx_cnt > 0U)
{
IICA->IICA0 = *gp_iica0_tx_address;
gp_iica0_tx_address++;
g_iica0_tx_cnt--;
}
else
{
iica0_callback_slave_sendend();
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
}
}
else
{
IICA->IICCTL00 |= IICA_IICCTL00_ACKE_Msk; /* ACKE0 = 1U: enable acknowledgment */
IICA->IICCTL00 &= ~IICA_IICCTL00_WTIM_Msk; /* WTIM0 = 0U: interrupt request is generated at the eighth clock's falling edge */
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
}
}
else
{
iica0_callback_slave_error(MD_ERROR);
}
}
else
{
if (IICA->IICS0 & IICA_IICS0_TRC_Msk) /* TRC0 == 1 */
{
g_iica0_slave_status_flag |= 4U; /* send flag */
if ((0U == (IICA->IICS0 & IICA_IICS0_ACKD_Msk)) && (g_iica0_tx_cnt != 0U))
{
iica0_callback_slave_error(MD_NACK);
}
else
{
if (g_iica0_tx_cnt > 0U)
{
IICA->IICA0 = *gp_iica0_tx_address;
gp_iica0_tx_address++;
g_iica0_tx_cnt--;
}
else
{
iica0_callback_slave_sendend();
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
}
}
}
else
{
g_iica0_slave_status_flag |= 2U; /* receive flag */
if (g_iica0_rx_cnt < g_iica0_rx_len)
{
RxBuffer2[g_iica0_rx_cnt] = IICA->IICA0;
g_iica0_rx_cnt++;if (g_iica0_rx_cnt == g_iica0_rx_len)
{
IICA->IICCTL00 |= IICA_IICCTL00_WTIM_Msk; /* WTIM0 = 1: interrupt request is generated at the ninth clock's falling edge */
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
iica0_callback_slave_receiveend();
}
else
{
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
}
}
else
{
IICA->IICCTL00 |= IICA_IICCTL00_WREL_Msk; /* WREL0 = 1U: cancel wait */
}
}
}
}
}
/*
*********************************************************************************
* 函 数 名：Send_Process_Connect_Upload
* 功能说明：发送数据给蓝牙MCU
* 形 参：void
* 返 回 值：void
*********************************************************************************
*/
void Send_Process_Connect_Upload(void)
{
uint16_t value_size = 0;
//uint16_t i = 0;
//uint8_t tmpbuf[10]={0};
static uint8_t value[200] = {0};
/* 判断串口发送是否立即执行*/
if((Sys_Data.Com_Stas & COM_SEND_RDY) !=COM_SEND_RDY)
{
return;
}
/* 串口组包存值Value*/
// value_size = SendPacekData(Sys_Data.SendBuf,Sys_Data.SendLen,value);
IICA0_SlaveSend(SLVADDR_98U,value,value_size);
while(g_iica0_tx_end == 0);
#if 0
/*发送数据*/
printf_log("\r\n send_process :");
for(i=0;i<(value_size);i++)
{
memset(tmpbuf,0,10);
u8_T_array(value[i],tmpbuf);
printf_log((const char *)tmpbuf);
printf_log(" ");
}
printf_log("\r\n value_size = %d",value_size);
#endif
//Sys_Data.Com_Stas = 0; /*指令状态复位*/
// Sys_Data.CmdData = 0; /*指令复位*/
// Sys_Data.SendLen = 0; /*数据长度为0*/
// memset(Sys_Data.CmdPara,0,sizeof(Sys_Data.CmdPara)); /*命令数据包复位*/
}
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