【求助】KL26硬件I2C通信问题，各位大佬看过来~~~

hhr1017 · 发表于 2017-7-26 10:04:49

以前用过K64的硬件I2C来读取MPU6050，现在需要用KL26的I2C来读取另外一款六轴传感器ICM20608（跟MPU6050基本一样），但是现在死活调不通I2C。用的是官方SDK2.2版本的库，各位大佬帮忙看一下，下面是相关代码。

//i2c回调函数
static void i2c_master_callback(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)
{
/* Signal transfer success when received success status. */
if (status == kStatus_Success)
{
completionFlag = true;
}
/* Signal transfer success when received success status. */
if ((status == kStatus_I2C_Nak) || (status == kStatus_I2C_Addr_Nak))
{
nakFlag = true;
}
}
//i2c写寄存器
static bool I2C_WriteReg(I2C_Type *base, uint8_t device_addr, uint8_t reg_addr, uint8_t value)
{
i2c_master_transfer_t masterXfer;
memset(&masterXfer, 0, sizeof(masterXfer));
masterXfer.slaveAddress = device_addr;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = reg_addr;
masterXfer.subaddressSize = 1;
masterXfer.data = &value;
masterXfer.dataSize = 1;
masterXfer.flags = kI2C_TransferDefaultFlag;
/* direction=write : start+device_write;cmdbuff;xBuff; */
/* direction=recive : start+device_write;cmdbuff;repeatStart+device_read;xBuff; */
I2C_MasterTransferNonBlocking(I2C_BASEADDR, &g_m_handle, &masterXfer);
/* wait for transfer completed. */
while ((!nakFlag) && (!completionFlag))
{
}
nakFlag = false;
if (completionFlag == true)
{
completionFlag = false;
return true;
}
else
{
return false;
}
}
//i2c读寄存器
static bool I2C_ReadRegs(I2C_Type *base, uint8_t device_addr, uint8_t reg_addr, uint8_t *rxBuff, uint32_t rxSize)
{
i2c_master_transfer_t masterXfer;
memset(&masterXfer, 0, sizeof(masterXfer));
masterXfer.slaveAddress = device_addr;
masterXfer.direction = kI2C_Read;
masterXfer.subaddress = reg_addr;
masterXfer.subaddressSize = 1;
masterXfer.data = rxBuff;
masterXfer.dataSize = rxSize;
masterXfer.flags = kI2C_TransferDefaultFlag;
/* direction=write : start+device_write;cmdbuff;xBuff; */
/* direction=recive : start+device_write;cmdbuff;repeatStart+device_read;xBuff; */
I2C_MasterTransferNonBlocking(I2C_BASEADDR, &g_m_handle, &masterXfer);
/* wait for transfer completed. */
while ((!nakFlag) && (!completionFlag))
{
}
nakFlag = false;
if (completionFlag == true)
{
completionFlag = false;
return true;
}
else
{
return false;
}
}
//i2c引脚复用设置
void I2C_ConfigurePins(void)
{
PORT_SetPinMux(PORTB, 0U, kPORT_MuxAlt2); /* PORTB0 (pin 35) is configured as I2C0_SCL */
PORTB->PCR[0] = ((PORTB->PCR[0] &
(~(PORT_PCR_PS_MASK | PORT_PCR_PE_MASK | PORT_PCR_ISF_MASK))) /* Mask bits to zero which are setting */
| PORT_PCR_PS(0x01u) /* Pull Select: Internal pullup resistor is enabled on the corresponding pin, if the corresponding PE field is set. */
| PORT_PCR_PE(0x01U) /* Pull Enable: Internal pullup or pulldown resistor is enabled on the corresponding pin, if the pin is configured as a digital input. */
);
PORT_SetPinMux(PORTB, 1U, kPORT_MuxAlt2); /* PORTB1 (pin 36) is configured as I2C0_SDA */
PORTB->PCR[1] = ((PORTB->PCR[1] &
(~(PORT_PCR_PS_MASK | PORT_PCR_PE_MASK | PORT_PCR_ISF_MASK))) /* Mask bits to zero which are setting */
| PORT_PCR_PS(0x01u) /* Pull Select: Internal pullup resistor is enabled on the corresponding pin, if the corresponding PE field is set. */
| PORT_PCR_PE(0x01u) /* Pull Enable: Internal pullup or pulldown resistor is enabled on the corresponding pin, if the pin is configured as a digital input. */
);
int icm_init(void)
{
unsigned char data[6];
I2C_ConfigurePins();
I2C_MasterTransferCreateHandle(I2C_BASEADDR, &g_m_handle, i2c_master_callback, NULL);
i2c_master_config_t masterConfig;
/*
* masterConfig.baudRate_Bps = 100000U;
* masterConfig.enableStopHold = false;
* masterConfig.glitchFilterWidth = 0U;
* masterConfig.enableMaster = true;
*/
I2C_MasterGetDefaultConfig(&masterConfig);
I2C_MasterInit(I2C_BASEADDR, &masterConfig, CLOCK_GetFreq(I2C0_CLK_SRC));
/* Reset device. */
data[0] = BIT_RESET;
if(I2C_WriteReg(I2C_BASEADDR,st.hw->addr,st.reg->pwr_mgmt_1,data[0]))
return -1;
delay_ms(100);
/* Wake up chip. */
data[0] = 0x00;
if (I2C_WriteReg(I2C_BASEADDR,st.hw->addr, st.reg->pwr_mgmt_1, data[0]))
return -1;
/* ICM20608 has no DMP therefore no need to share memory */
data[0] = BIT_FIFO_SIZE_4096;
if (I2C_WriteReg(I2C_BASEADDR,st.hw->addr, st.reg->accel_cfg2, data[0]))
return -1;
/* Set to invalid values to ensure no I2C writes are skipped. */
st.chip_cfg.sensors = 0xFF;
st.chip_cfg.gyro_fsr = 0xFF;
st.chip_cfg.accel_fsr = 0xFF;
st.chip_cfg.gyro_lpf = 0xFF;
st.chip_cfg.accel_lpf = 0xFF;
st.chip_cfg.sample_rate = 0xFFFF;
st.chip_cfg.fifo_enable = 0xFF;
st.chip_cfg.bypass_mode = 0xFF;
/* icm_set_sensors always preserves this setting. */
st.chip_cfg.clk_src = INV_CLK_PLL;
/* Handled in next call to icm_set_bypass. */
st.chip_cfg.active_low_int = 1;
st.chip_cfg.latched_int = 0;
st.chip_cfg.int_motion_only = 0;
st.chip_cfg.lp_accel_mode = 0;
memset(&st.chip_cfg.cache, 0, sizeof(st.chip_cfg.cache));
if (icm_set_gyro_fsr(2000))
return -1;
if (icm_set_accel_fsr(2))
return -1;
if (icm_set_gyro_lpf(50))
return -1;
if (icm_set_accel_lpf(50))
return -1;
if (icm_set_sample_rate(50))
return -1;
if (icm_configure_fifo(0))
return -1;
if (icm_set_bypass(0))
return -1;
icm_set_sensors(0);
return 0;
}