I found a strange phenomenon,When I commented the code like this.Calling the i2cMasterTransmitTimeout function will still restart.
Code: Select all
msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
const uint8_t *txbuf, size_t txbytes,
uint8_t *rxbuf, size_t rxbytes,
systime_t timeout) {
I2C_TypeDef *dp = i2cp->i2c;
systime_t start, end;
#if defined(STM32F1XX_I2C)
// osalDbgCheck((rxbytes == 0) || ((rxbytes > 1) && (rxbuf != NULL)));
#endif
/* Resetting error flags for this transfer.*/
// i2cp->errors = I2C_NO_ERROR;
/* Initializes driver fields, LSB = 0 -> transmit.*/
// i2cp->addr = (addr << 1);
/* Releases the lock from high level driver.*/
//osalSysUnlock();
/* TX DMA setup.*/
// dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
// dmaStreamSetMemory0(i2cp->dmatx, txbuf);
// dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
/* RX DMA setup.*/
// dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
// dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
// dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
/* Calculating the time window for the timeout on the busy bus condition.*/
// start = osalOsGetSystemTimeX();
// end = start + OSAL_MS2ST(STM32_I2C_BUSY_TIMEOUT);
/* Waits until BUSY flag is reset or, alternatively, for a timeout
condition.*/
// while (true) {
osalSysLock();
/* If the bus is not busy then the operation can continue, note, the
loop is exited in the locked state.*/
// if (!(dp->SR2 & I2C_SR2_BUSY) && !(dp->CR1 & I2C_CR1_STOP))
// break;
/* If the system time went outside the allowed window then a timeout
condition is returned.*/
// if (!osalOsIsTimeWithinX(osalOsGetSystemTimeX(), start, end))
// return MSG_TIMEOUT;
osalSysUnlock();
// }
/* Starts the operation.*/
//dp->CR2 |= I2C_CR2_ITEVTEN;
//dp->CR1 |= I2C_CR1_START;
/* Waits for the operation completion or a timeout.*/
//return osalThreadSuspendTimeoutS(&i2cp->thread, timeout);
return true;
}
But after I commented out osalSysLock() and osalSysUnlock(), the system will not restart repeatedly.But when I further commented and modified the code, the system started to restart again and again.
Code: Select all
msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
const uint8_t *txbuf, size_t txbytes,
uint8_t *rxbuf, size_t rxbytes,
systime_t timeout) {
I2C_TypeDef *dp = i2cp->i2c;
systime_t start, end;
#if defined(STM32F1XX_I2C)
// osalDbgCheck((rxbytes == 0) || ((rxbytes > 1) && (rxbuf != NULL)));
#endif
/* Resetting error flags for this transfer.*/
// i2cp->errors = I2C_NO_ERROR;
/* Initializes driver fields, LSB = 0 -> transmit.*/
// i2cp->addr = (addr << 1);
/* Releases the lock from high level driver.*/
//osalSysUnlock();
/* TX DMA setup.*/
// dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
// dmaStreamSetMemory0(i2cp->dmatx, txbuf);
// dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
/* RX DMA setup.*/
// dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
// dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
// dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
/* Calculating the time window for the timeout on the busy bus condition.*/
// start = osalOsGetSystemTimeX();
// end = start + OSAL_MS2ST(STM32_I2C_BUSY_TIMEOUT);
/* Waits until BUSY flag is reset or, alternatively, for a timeout
condition.*/
// while (true) {
//osalSysLock();
/* If the bus is not busy then the operation can continue, note, the
loop is exited in the locked state.*/
// if (!(dp->SR2 & I2C_SR2_BUSY) && !(dp->CR1 & I2C_CR1_STOP))
// break;
/* If the system time went outside the allowed window then a timeout
condition is returned.*/
// if (!osalOsIsTimeWithinX(osalOsGetSystemTimeX(), start, end))
// return MSG_TIMEOUT;
//osalSysUnlock();
// }
/* Starts the operation.*/
//dp->CR2 |= I2C_CR2_ITEVTEN;
//dp->CR1 |= I2C_CR1_START;
/* Waits for the operation completion or a timeout.*/
return osalThreadSuspendTimeoutS(&i2cp->thread, timeout);
//return true;
}
.