这篇教程C++ I2C_GenerateSTART函数代码示例写得很实用，希望能帮到您。
本文整理汇总了C++中I2C_GenerateSTART函数的典型用法代码示例。如果您正苦于以下问题：C++ I2C_GenerateSTART函数的具体用法？C++ I2C_GenerateSTART怎么用？C++ I2C_GenerateSTART使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。 在下文中一共展示了I2C_GenerateSTART函数的30个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。 示例1: LM75_ShutDown/** * @brief Enables or disables the LM75. * @param NewState: specifies the LM75 new status. This parameter can be ENABLE * or DISABLE. * @retval None */uint8_t LM75_ShutDown(FunctionalState NewState){ uint8_t LM75_BufferRX[2] ={0,0}; uint8_t LM75_BufferTX = 0; __IO uint8_t RegValue = 0; /* Test on BUSY Flag */ LM75_Timeout = LM75_LONG_TIMEOUT; while (I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_BUSY)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Configure DMA Peripheral */ LM75_DMA_Config(LM75_DMA_RX, (uint8_t*)LM75_BufferRX, 2); /* Enable DMA NACK automatic generation */ I2C_DMALastTransferCmd(LM75_I2C, ENABLE); /* Enable the I2C peripheral */ I2C_GenerateSTART(LM75_I2C, ENABLE); /* Test on SB Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_SB)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send device address for write */ I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Transmitter); /* Test on ADDR Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send the device's internal address to write to */ I2C_SendData(LM75_I2C, LM75_REG_CONF); /* Test on TXE FLag (data sent) */ LM75_Timeout = LM75_FLAG_TIMEOUT; while ((!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_BTF))) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send START condition a second time */ I2C_GenerateSTART(LM75_I2C, ENABLE); /* Test on SB Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_SB)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send LM75 address for read */ I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Receiver); /* Test on ADDR Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Enable I2C DMA request */ I2C_DMACmd(LM75_I2C,ENABLE); /* Enable DMA RX Channel */ DMA_Cmd(LM75_DMA_RX_CHANNEL, ENABLE); /* Wait until DMA Transfer Complete */ LM75_Timeout = LM75_LONG_TIMEOUT; while (!DMA_GetFlagStatus(LM75_DMA_RX_TCFLAG)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send STOP Condition */ I2C_GenerateSTOP(LM75_I2C, ENABLE); /* Disable DMA RX Channel */ DMA_Cmd(LM75_DMA_RX_CHANNEL, DISABLE); /* Disable I2C DMA request */ I2C_DMACmd(LM75_I2C,DISABLE); /* Clear DMA RX Transfer Complete Flag */ DMA_ClearFlag(LM75_DMA_RX_TCFLAG); //.........这里部分代码省略.........
开发者ID:91thUb，项目名称:usb-miner，代码行数:101，
示例2: I2C_RandReadint I2C_RandRead(uint8_t slave,uint16_t addr,uint8_t addrsize,void *pbuffer,uint16_t len){struct i2c_job_st i2c_jobs[2];uint8_t buf_offset[2]; xSemaphoreTake(xSemaphoreI2C_Mutex,portMAX_DELAY); if (I2C_isBusy()) { i2c_error_flags = I2C_SR1_SB; xSemaphoreGive(xSemaphoreI2C_Mutex); return FALSE; } i2c_cntr = 0; i2c_oper = I2C_Direction_Transmitter; job = i2c_jobs; i2c_addr = slave << 1; memset(i2c_jobs,0,sizeof(i2c_jobs)); if (addrsize == 1) buf_offset[0] = (uint8_t)addr; else { buf_offset[0] = (uint8_t)(addr >> 8); buf_offset[1] = (uint8_t)(addr & 0xff); } i2c_jobs[0].buf = buf_offset; i2c_jobs[0].len = addrsize; i2c_jobs[0].dir = I2C_Direction_Transmitter; i2c_jobs[1].buf = (uint8_t *)pbuffer; i2c_jobs[1].len = len; i2c_jobs[1].dir = I2C_Direction_Receiver; i2c_jobs[1].last = TRUE; i2c_error_flags = 0; i2c_done = i2c_err = FALSE; // clear the semaphore while (xSemaphoreTake(xSemaphoreI2C_Work,0)); I2C_AcknowledgeConfig(I2Cx,ENABLE); I2C_NACKPositionConfig(I2Cx,I2C_NACKPosition_Current); I2C_ITConfig(I2Cx,I2C_IT_BUF | I2C_IT_ERR | I2C_IT_EVT,ENABLE); /* Send START condition */ I2C_GenerateSTART(I2Cx, ENABLE); while (!i2c_done && !i2c_err) { if (!xSemaphoreTake(xSemaphoreI2C_Work,SEMA_DELAY)) { I2C_Open(0); i2c_err = TRUE; break; } } I2C_ITConfig(I2Cx,I2C_IT_BUF | I2C_IT_ERR | I2C_IT_EVT,DISABLE); xSemaphoreGive(xSemaphoreI2C_Mutex); return !i2c_err;}
开发者ID:pandc，项目名称:unitek，代码行数:64，
示例3: LM75_ReadReg/** * @brief Read the specified register from the LM75. * @param RegName: specifies the LM75 register to be read. * This member can be one of the following values: * - LM75_REG_TEMP: temperature register * - LM75_REG_TOS: Over-limit temperature register * - LM75_REG_THYS: Hysteresis temperature register * @retval LM75 register value. */uint16_t LM75_ReadReg(uint8_t RegName){ uint8_t LM75_BufferRX[2] ={0,0}; uint16_t tmp = 0; /* Test on BUSY Flag */ LM75_Timeout = LM75_LONG_TIMEOUT; while (I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_BUSY)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Configure DMA Peripheral */ LM75_DMA_Config(LM75_DMA_RX, (uint8_t*)LM75_BufferRX, 2); /* Enable DMA NACK automatic generation */ I2C_DMALastTransferCmd(LM75_I2C, ENABLE); /* Enable the I2C peripheral */ I2C_GenerateSTART(LM75_I2C, ENABLE); /* Test on SB Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_SB)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send device address for write */ I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Transmitter); /* Test on ADDR Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send the device's internal address to write to */ I2C_SendData(LM75_I2C, RegName); /* Test on TXE FLag (data sent) */ LM75_Timeout = LM75_FLAG_TIMEOUT; while ((!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_BTF))) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send START condition a second time */ I2C_GenerateSTART(LM75_I2C, ENABLE); /* Test on SB Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_GetFlagStatus(LM75_I2C,I2C_FLAG_SB)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send LM75 address for read */ I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Receiver); /* Test on ADDR Flag */ LM75_Timeout = LM75_FLAG_TIMEOUT; while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Enable I2C DMA request */ I2C_DMACmd(LM75_I2C,ENABLE); /* Enable DMA RX Channel */ DMA_Cmd(LM75_DMA_RX_CHANNEL, ENABLE); /* Wait until DMA Transfer Complete */ LM75_Timeout = LM75_LONG_TIMEOUT; while (!DMA_GetFlagStatus(LM75_DMA_RX_TCFLAG)) { if((LM75_Timeout--) == 0) return LM75_TIMEOUT_UserCallback(); } /* Send STOP Condition */ I2C_GenerateSTOP(LM75_I2C, ENABLE); /* Disable DMA RX Channel */ DMA_Cmd(LM75_DMA_RX_CHANNEL, DISABLE); /* Disable I2C DMA request */ I2C_DMACmd(LM75_I2C,DISABLE); /* Clear DMA RX Transfer Complete Flag *///.........这里部分代码省略.........
开发者ID:burakagca，项目名称:ARMWork，代码行数:101，
示例4: i2c_ev_handlervoid i2c_ev_handler(void){ static uint8_t subaddress_sent, final_stop; // flag to indicate if subaddess sent, flag to indicate final bus condition static int8_t index; // index is signed -1 == send the subaddress uint8_t SReg_1 = I2Cx->SR1; // read the status register here if (SReg_1 & 0x0001) { // we just sent a start - EV5 in ref manual I2Cx->CR1 &= ~0x0800; // reset the POS bit so ACK/NACK applied to the current byte I2C_AcknowledgeConfig(I2Cx, ENABLE); // make sure ACK is on index = 0; // reset the index if (reading && (subaddress_sent || 0xFF == reg)) { // we have sent the subaddr subaddress_sent = 1; // make sure this is set in case of no subaddress, so following code runs correctly if (bytes == 2) I2Cx->CR1 |= 0x0800; // set the POS bit so NACK applied to the final byte in the two byte read I2C_Send7bitAddress(I2Cx, addr, I2C_Direction_Receiver); // send the address and set hardware mode } else { // direction is Tx, or we havent sent the sub and rep start I2C_Send7bitAddress(I2Cx, addr, I2C_Direction_Transmitter); // send the address and set hardware mode if (reg != 0xFF) // 0xFF as subaddress means it will be ignored, in Tx or Rx mode index = -1; // send a subaddress } } else if (SReg_1 & 0x0002) { // we just sent the address - EV6 in ref manual // Read SR1,2 to clear ADDR __DMB(); // memory fence to control hardware if (bytes == 1 && reading && subaddress_sent) { // we are receiving 1 byte - EV6_3 I2C_AcknowledgeConfig(I2Cx, DISABLE); // turn off ACK __DMB(); (void)I2Cx->SR2; // clear ADDR after ACK is turned off I2C_GenerateSTOP(I2Cx, ENABLE); // program the stop final_stop = 1; I2C_ITConfig(I2Cx, I2C_IT_BUF, ENABLE); // allow us to have an EV7 } else { // EV6 and EV6_1 (void)I2Cx->SR2; // clear the ADDR here __DMB(); if (bytes == 2 && reading && subaddress_sent) { // rx 2 bytes - EV6_1 I2C_AcknowledgeConfig(I2Cx, DISABLE); // turn off ACK I2C_ITConfig(I2Cx, I2C_IT_BUF, DISABLE); // disable TXE to allow the buffer to fill } else if (bytes == 3 && reading && subaddress_sent) // rx 3 bytes I2C_ITConfig(I2Cx, I2C_IT_BUF, DISABLE); // make sure RXNE disabled so we get a BTF in two bytes time else // receiving greater than three bytes, sending subaddress, or transmitting I2C_ITConfig(I2Cx, I2C_IT_BUF, ENABLE); } } else if (SReg_1 & 0x004) { // Byte transfer finished - EV7_2, EV7_3 or EV8_2 final_stop = 1; if (reading && subaddress_sent) { // EV7_2, EV7_3 if (bytes > 2) { // EV7_2 I2C_AcknowledgeConfig(I2Cx, DISABLE); // turn off ACK read_p[index++] = (uint8_t)I2Cx->DR; // read data N-2 I2C_GenerateSTOP(I2Cx, ENABLE); // program the Stop final_stop = 1; // required to fix hardware read_p[index++] = (uint8_t)I2Cx->DR; // read data N - 1 I2C_ITConfig(I2Cx, I2C_IT_BUF, ENABLE); // enable TXE to allow the final EV7 } else { // EV7_3 if (final_stop) I2C_GenerateSTOP(I2Cx, ENABLE); // program the Stop else I2C_GenerateSTART(I2Cx, ENABLE); // program a rep start read_p[index++] = (uint8_t)I2Cx->DR; // read data N - 1 read_p[index++] = (uint8_t)I2Cx->DR; // read data N index++; // to show job completed } } else { // EV8_2, which may be due to a subaddress sent or a write completion if (subaddress_sent || (writing)) { if (final_stop) I2C_GenerateSTOP(I2Cx, ENABLE); // program the Stop else I2C_GenerateSTART(I2Cx, ENABLE); // program a rep start index++; // to show that the job is complete } else { // We need to send a subaddress I2C_GenerateSTART(I2Cx, ENABLE); // program the repeated Start subaddress_sent = 1; // this is set back to zero upon completion of the current task } } // we must wait for the start to clear, otherwise we get constant BTF while (I2Cx->CR1 & 0x0100) { ; } } else if (SReg_1 & 0x0040) { // Byte received - EV7 read_p[index++] = (uint8_t)I2Cx->DR; if (bytes == (index + 3)) I2C_ITConfig(I2Cx, I2C_IT_BUF, DISABLE); // disable TXE to allow the buffer to flush so we can get an EV7_2 if (bytes == index) // We have completed a final EV7 index++; // to show job is complete } else if (SReg_1 & 0x0080) { // Byte transmitted EV8 / EV8_1 if (index != -1) { // we dont have a subaddress to send I2Cx->DR = write_p[index++]; if (bytes == index) // we have sent all the data I2C_ITConfig(I2Cx, I2C_IT_BUF, DISABLE); // disable TXE to allow the buffer to flush } else { index++; I2Cx->DR = reg; // send the subaddress if (reading || !bytes) // if receiving or sending 0 bytes, flush now I2C_ITConfig(I2Cx, I2C_IT_BUF, DISABLE); // disable TXE to allow the buffer to flush } } if (index == bytes + 1) { // we have completed the current job subaddress_sent = 0; // reset this here if (final_stop) // If there is a final stop and no more jobs, bus is inactive, disable interrupts to prevent BTF I2C_ITConfig(I2Cx, I2C_IT_EVT | I2C_IT_ERR, DISABLE); // Disable EVT and ERR interrupts while bus inactive busy = 0; }//.........这里部分代码省略.........
开发者ID:363546178，项目名称:baseflight，代码行数:101，
示例5: I2C_ByteReadErrorStatus I2C_ByteRead(uint8_t I2C_Addrs,uint8_t ReadAddr,uint8_t Data_Buffer[],uint8_t Number_Bytes_to_Read){ uint8_t i=0; ErrorStatus status=ERROR; while(i<=7) { switch(i) { case 0: i++; //Pass I2C_Time_Out_Counter=I2C_Time_Out;#ifdef I2C_By_Function_Base while(I2C_GetFlagStatus(I2C_FLAG_BUSBUSY)) //Line busy#else while(I2C->SR3 & 0x02) //等待
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