Other Parts Discussed in Thread: TCA9535, MSP430G2553
I try to use the demo boostxl_edumkII_lightSensor_msp432p401r to read data from TCA9535,like this
const eUSCI_I2C_MasterConfig i2cConfig =
{
EUSCI_B_I2C_CLOCKSOURCE_SMCLK, // SMCLK Clock Source
24000000, // SMCLK = 48MHz
EUSCI_B_I2C_SET_DATA_RATE_100KBPS, // Desired I2C Clock of 100khz
0, // No byte counter threshold
EUSCI_B_I2C_NO_AUTO_STOP // No Autostop
};
static void TCA9535_Write(ST_TCA9535* a_pstTCA9535, C_U8 a_u8RegAddr, C_U8 a_u8RegData)
{
/* Specify slave address for I2C */
I2C_setSlaveAddress(EUSCI_B3_BASE,
(a_pstTCA9535->m_DevAddr));
/* Enable and clear the interrupt flag */
I2C_clearInterruptFlag(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_RECEIVE_INTERRUPT0);
/* Set master to transmit mode PL */
I2C_setMode(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_MODE);
/* Clear any existing interrupt flag PL */
I2C_clearInterruptFlag(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_INTERRUPT0);
/* Wait until ready to write PL */
while (I2C_isBusBusy(EUSCI_B3_BASE));
/* Initiate start and send first character */
I2C_masterSendMultiByteStart(EUSCI_B3_BASE,
a_u8RegAddr);
I2C_masterSendMultiByteFinish(EUSCI_B3_BASE,
a_u8RegData);
}
static void TCA9535_Read(ST_TCA9535* a_pstTCA9535, C_U8 a_u8RegAddr, C_U8* a_u8RegData)
{
/* Specify slave address for I2C */
I2C_setSlaveAddress(EUSCI_B3_BASE,
(a_pstTCA9535->m_DevAddr));
/* Enable and clear the interrupt flag */
I2C_clearInterruptFlag(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_RECEIVE_INTERRUPT0);
/* Set master to transmit mode PL */
I2C_setMode(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_MODE);
/* Clear any existing interrupt flag PL */
I2C_clearInterruptFlag(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_INTERRUPT0);
/* Wait until ready to write PL */
while (I2C_isBusBusy(EUSCI_B3_BASE));
/* Initiate start and send first character */
I2C_masterSendMultiByteStart(EUSCI_B3_BASE, a_u8RegAddr);
/* Wait for TX to finish */
while(!(I2C_getInterruptStatus(EUSCI_B3_BASE,
EUSCI_B_I2C_TRANSMIT_INTERRUPT0)));
/* Initiate stop only */
I2C_masterSendMultiByteStop(EUSCI_B3_BASE);
/*
* Generate Start condition and set it to receive mode.
* This sends out the slave address and continues to read
* until you issue a STOP
*/
*a_u8RegData = I2C_masterReceiveSingleByte(EUSCI_B3_BASE);
//I2C_masterReceiveStart(EUSCI_B3_BASE);
/* Wait for RX buffer to fill */
// while(!(I2C_getInterruptStatus(EUSCI_B3_BASE,
// EUSCI_B_I2C_RECEIVE_INTERRUPT0)));
/* Receive second byte then send STOP condition */
// *a_u8RegData = I2C_masterReceiveMultiByteFinish(EUSCI_B3_BASE);
}
void TCA9535_Init(ST_TCA9535* a_pstTCA9535, C_U8 a_u8DevAddr)
{
a_pstTCA9535->m_DevAddrW = (a_u8DevAddr << 1) | 0; // Addr + Write
a_pstTCA9535->m_DevAddrR = (a_u8DevAddr << 1) | 1; // Addr + Read
a_pstTCA9535->m_DevAddr = a_u8DevAddr;
GPIO_setAsPeripheralModuleFunctionOutputPin(
SCL_PORT,
SCL_PIN,
GPIO_SECONDARY_MODULE_FUNCTION);
GPIO_setAsPeripheralModuleFunctionOutputPin(
SDA_PORT,
SDA_PIN,
GPIO_SECONDARY_MODULE_FUNCTION);
/* Initialize USCI_B0 and I2C Master to communicate with slave devices*/
I2C_initMaster(EUSCI_B3_BASE, &i2cConfig);
/* Disable I2C module to make changes */
I2C_disableModule(EUSCI_B3_BASE);
/* Enable I2C Module to start operations */
I2C_enableModule(EUSCI_B3_BASE);
/* Select I2C function for I2C_SCL(P6.5) & I2C_SDA(P6.4) */
}
but it will stuck in
while (I2C_isBusBusy(EUSCI_B3_BASE));
because the UCBBUSY is alwasy set.
And i found that UCBBUSY is set right after i do I2C_enableModule(EUSCI_B3_BASE);
and never reset, but i haven't begun to send a byte.
or i will stuck in
I2C_masterSendMultiByteFinish(EUSCI_B3_BASE,
a_u8RegData);
do you know why?
