※ 引述《lovecity (我要快乐)》之铭言： : 目前用LM4F的MCU写 五个不同仪器的资料可以由五个UART(UART1、UART2、UART3、UART4 : 、UART5)的Rx接收 : 後送给UART0的Rx收然後传给电脑人机(BCB5) : UART0的部分是使用udma写的 : 以下是我撷取的一部分晶片程式码 : // The number of SysTick ticks per second used for the SysTick interrupt. : //***************************************************************************** : #define SYSTICKS_PER_SECOND 100 : //***************************************************************************** : // The size of the UART transmit and receive buffers. They do not need to be : // the same size. : //***************************************************************************** : #define UART_TXBUF_SIZE 16 : #define UART_RXBUF_SIZE 16 : //***************************************************************************** : // The transmit and receive buffers used for the UART transfers. There is one : // transmit buffer and a pair of recieve ping-pong buffers. : //***************************************************************************** : //static unsigned char g_ucTxBuf[UART_TXBUF_SIZE]; : static unsigned char g_ucRxBuf1[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf2[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf3[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf4[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf5[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf6[UART_RXBUF_SIZE]; : static unsigned char g_ucRxBuf7[UART_RXBUF_SIZE]; : //static unsigned char k=0; : unsigned char uartTmpBuff[UART_RXBUF_SIZE+4+4]; : void : UART1IntHandler(void) //此中断是做收资料与传资料 : { : unsigned long ulStatus; : char header[]="###B"; //辨识符号 : char tail[]="B%%%"; : //get interrupt status : ulStatus = ROM_UARTIntStatus(UART1_BASE, true); : //clear the asserted interrupts : ROM_UARTIntClear(UART1_BASE, ulStatus); : //FIFO data transfer : if(ulStatus == UART_INT_RX)//接收中断标帜 : { : while(ROM_UARTCharsAvail(UART1_BASE)) //loop while there are chars : { : g_ucRxBuf1[g_ulRxBuf1Count++] = ROM_UARTCharGetNonBlocking(UART1_BASE); : if(g_ulRxBuf1Count >= UART_RXBUF_SIZE) : { : g_ulRxBuf1Count = 0; : /*ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT, : UDMA_MODE_BASIC, header, : (void *)(UART0_BASE + UART_O_DR), : 3); : ROM_uDMAChannelEnable(UDMA_CHANNEL_UART0TX);*/ : memcpy(uartTmpBuff,header,sizeof(header)); : memcpy(uartTmpBuff+sizeof(header)-1,g_ucRxBuf1,sizeof(g_ucRxBuf1)); : memcpy(uartTmpBuff+sizeof(header)+sizeof(g_ucRxBuf1)-1,tail,sizeof(tail)); : //通道传输设置 : ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT, : UDMA_MODE_BASIC, uartTmpBuff, : (void *)(UART0_BASE + UART_O_DR), : sizeof(uartTmpBuff)); : ROM_uDMAChannelEnable(UDMA_CHANNEL_UART0TX); : } : } : } : } : void : UART2IntHandler(void) //此中断是做收资料与传资料 : { : unsigned long ulStatus; : char header[]="###C"; : char tail[]="C%%%"; : //get interrupt status : ulStatus = ROM_UARTIntStatus(UART2_BASE, true); : //clear the asserted interrupts : ROM_UARTIntClear(UART2_BASE, ulStatus); : //FIFO data transfer : if(ulStatus == UART_INT_RX) : { : while(ROM_UARTCharsAvail(UART2_BASE)) //loop while there are chars : { : g_ucRxBuf2[g_ulRxBuf2Count++]= ROM_UARTCharGetNonBlocking(UART2_BASE); : if(g_ulRxBuf2Count >= UART_RXBUF_SIZE) : { : g_ulRxBuf2Count = 0; : memcpy(uartTmpBuff,header,sizeof(header)); : memcpy(uartTmpBuff+sizeof(header)-1,g_ucRxBuf2,sizeof(g_ucRxBuf2)); : memcpy(uartTmpBuff+sizeof(header)+sizeof(g_ucRxBuf2)-1,tail,sizeof(tail)); : ROM_uDMAChannelTransferSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT, : UDMA_MODE_BASIC, uartTmpBuff, : (void *)(UART0_BASE + UART_O_DR), : sizeof(uartTmpBuff)); : ROM_uDMAChannelEnable(UDMA_CHANNEL_UART0TX); : } : } : } : } : void : InitUART0(void) : { : // Enable the UART peripheral, and configure it to operate even if the CPU : // is in sleep. : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); : ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UART0); : ROM_GPIOPinConfigure(GPIO_PA0_U0RX); : ROM_GPIOPinConfigure(GPIO_PA1_U0TX); : ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1); : // Configure the UART communication parameters. : ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200, : UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | : UART_CONFIG_PAR_NONE); : // Set both the TX and RX trigger thresholds to 4. This will be used by : // the uDMA controller to signal when more data should be transferred. : The : // uDMA TX and RX channels will be configured so that it can transfer 4 : // bytes in a burst when the UART is ready to transfer more data. : ROM_UARTFIFOLevelSet(UART0_BASE, UART_FIFO_TX4_8, UART_FIFO_RX4_8); : // Enable the UART for operation, and enable the uDMA interface for RX : // channels. : ROM_UARTEnable(UART0_BASE); : ROM_UARTDMAEnable(UART0_BASE, UART_DMA_TX); : // Put the attributes in a known state for the uDMA UART0TX channel. : These : // should already be disabled by default. : // uDMA通道属性清除 : ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_UART0TX, //选择UART0 TX的 : DMA通道 : UDMA_ATTR_ALTSELECT | //设置为主控制结 : 构 : UDMA_ATTR_HIGH_PRIORITY | //普通优先级 : UDMA_ATTR_REQMASK); //响应外设请求 : // Set the USEBURST attribute for the uDMA UART TX channel. This will : // force the controller to always use a burst when transferring data from : // the TX buffer to the UART. This is somewhat more effecient bus usage : // than the default which allows single or burst transfers. : //uDMA通道属性始能 : ROM_uDMAChannelAttributeEnable(UDMA_CHANNEL_UART0TX, UDMA_ATTR_USEBURST); : //选择UART0 TX的DMA通道;设置触发方式只有脉冲触发有效 : // Configure the control parameters for the UART TX. The uDMA UART TX : // channel is used to transfer a block of data from a buffer to the UART. : // The data size is 8 bits. The source address increment is 8-bit bytes : // since the data is coming from a buffer. The destination increment is : // none since the data is to be written to the UART data register. The : // arbitration size is set to 4, which matches the UART TX FIFO trigger : // threshold. : //uDMA通道控制设置 : ROM_uDMAChannelControlSet(UDMA_CHANNEL_UART0TX | UDMA_PRI_SELECT, : UDMA_SIZE_8 | UDMA_SRC_INC_8 | : UDMA_DST_INC_NONE | : UDMA_ARB_4); : } : void : InitUARTs(void) : { : // Enable the UART1 peripheral, and configure it to operate even if the : CPU is in sleep. : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC); : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1); : ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UART1); : ROM_GPIOPinConfigure(GPIO_PC4_U1RX); : ROM_GPIOPinConfigure(GPIO_PC5_U1TX); : ROM_GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5); : ROM_UARTConfigSetExpClk(UART1_BASE, ROM_SysCtlClockGet(), 9600, : UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE); : ROM_UARTFIFOLevelSet(UART1_BASE, UART_FIFO_TX2_8, UART_FIFO_RX2_8); : ROM_UARTEnable(UART1_BASE); : ROM_IntEnable(INT_UART1); : ROM_UARTIntEnable(UART1_BASE, UART_INT_RX | UART_INT_RT); : } : int : main(void) : { : static unsigned long ulPrevSeconds; : volatile unsigned long ulLoop; : // Enable lazy stacking for interrupt handlers. : ROM_FPULazyStackingEnable(); : //clock 80M : SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | : SYSCTL_XTAL_16MHZ); : ROM_SysCtlPeripheralClockGating(true); : // Enable the GPIO port that is used for the on-board LED. : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF); : ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1); : ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2); : // Configure SysTick to occur 100 times per second, to use as a time : // reference. Enable SysTick to generate interrupts. : ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / SYSTICKS_PER_SECOND); : ROM_SysTickIntEnable(); : ROM_SysTickEnable(); : // Initialize the CPU usage measurement routine. : //CPUUsageInit(ROM_SysCtlClockGet(), SYSTICKS_PER_SECOND, 2); : // Enable the uDMA controller at the system level. Enable it to continue : // to run while the processor is in sleep. : ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA); : ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UDMA); : // Enable the uDMA controller error interrupt. This interrupt will occur : // if there is a bus error during a transfer. : ROM_IntEnable(INT_UDMAERR); : // Enable the uDMA controller. : ROM_uDMAEnable(); : // Point at the control table to use for channel control structures. : ROM_uDMAControlBaseSet(ucControlTable); : // Initialize the uDMA memory to memory transfers. : //InitSWTransfer(); : // Initialize the uDMA UART transfers. : ROM_IntMasterEnable(); : InitUART0(); : InitUARTs(); : UARTStdioInit(0); : UARTprintf("\nStart\n"); : // Remember the current SysTick seconds count. : ulPrevSeconds = g_ulSeconds; : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, 0); : // Loop until the button is pressed. The processor is put to sleep : // in this loop so that CPU utilization can be measured. : while(1) : { : // Check to see if one second has elapsed. If so, the make some : updates. : if(g_ulSeconds != ulPrevSeconds) : { : // Turn on the LED as a heartbeat : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2); : SysCtlDelay(SysCtlClockGet() / 3 /5); : // Turn off the LED. : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0); : SysCtlDelay(SysCtlClockGet() / 3 /5); : } : // Put the processor to sleep if there is nothing to do. This allows : // the CPU usage routine to measure the number of free CPU cycles. : // If the processor is sleeping a lot, it can be hard to connect to : // the target with the debugger. : ROM_SysCtlSleep(); : // See if we have run long enough and exit the loop if so. : if(g_ulSeconds >= 10) : { : break; : } : } : // Indicate on the display that the example is stopped. : UARTprintf("\nStopped\n"); : // Loop forever with the CPU not sleeping, so the debugger can connect. : while(1) : { : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, GPIO_PIN_1); : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2); : SysCtlDelay(SysCtlClockGet() / 3 /5); : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, 0); : GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0); : SysCtlDelay(SysCtlClockGet() / 3 /5); : } : } : 跟电脑人机连接的UART0鲍率是设定115200 : 其他五个UART的鲍率是19200 : 五个仪器会同时传资料进晶片 : 晶片再传给人机 : 我用BCB5写人机介面 : 但是如果送进去晶片的资料量大一点 : 人机介面收到所解出来的资料就会错很多 : 除错除了快一个月了 : 无法确定是晶片的问题还是BCB5的问题 : 请问有高手可以指教吗??? : 晶片这样写如果五组资料同时传会不会造成资料错乱呢? : BCB5收资料的部分我是用到六个timer去写 : 一个timer专门收集资料 : 另外五个解五个仪器的资料 : 大致上是这样 : 感激不尽 >< 当五个仪器得资料进来时,所对应的MCU的UART有设定优先权吗? 假设MCU UART0 接收资料时在中断停留太久,其他的UART中断来不及处理 就会有可能会掉资料. 你可以试看看量测UART进入中断到出中断时间,推算是否会超过接收资料得时间. 当传输资料量变大时,有可能在某一中断接收与传送资料太久导致其他中断 无法接收完全的资料 以上就参考看看 --

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