TC264 DMA相关部分代码

DMA

DMA计脉冲数
DMA处理UART中断

DMA计脉冲数

需要注意不要摄像头的中断冲突，优点就是不会占用cpu的时序，虽然影响也不是很大。

//dma计脉冲数
uint32 dummy = 0;//工具人参数
static IfxDma_Dma_Channel dmaChn_cnt_left;
static IfxDma_Dma_Channel dmaChn_cnt_right;void dma_cnt_pin(ERU_PIN_enum pin, uint8 l_or_r)
{boolean interrupt_state = disableInterrupts();IfxScu_Req_In *reqPin;reqPin = eru_mux(pin);IfxScuEru_initReqPin(reqPin, IfxPort_InputMode_pullUp);IfxScuEru_InputChannel inputChannel = (IfxScuEru_InputChannel)reqPin->channelId;IfxScuEru_InputNodePointer triggerSelect = (IfxScuEru_InputNodePointer)(pin/3);IfxScuEru_OutputChannel    outputChannel = (IfxScuEru_OutputChannel)(pin/3);IfxScuEru_enableFallingEdgeDetection(inputChannel);IfxScuEru_enableRisingEdgeDetection(inputChannel);      //统计上升下降沿IfxScuEru_enableTriggerPulse(inputChannel);IfxScuEru_connectTrigger(inputChannel, triggerSelect);//使能中断IfxScuEru_setFlagPatternDetection(outputChannel, inputChannel, TRUE);IfxScuEru_enablePatternDetectionTrigger(outputChannel);IfxScuEru_setInterruptGatingPattern(outputChannel, IfxScuEru_InterruptGatingPattern_alwaysActive);//配置中断volatile Ifx_SRC_SRCR *src = &MODULE_SRC.SCU.SCU.ERU[(int)outputChannel % 4];if (l_or_r){IfxSrc_init(src, IfxSrc_Tos_dma, dma_cnt_ch_left);}else{IfxSrc_init(src, IfxSrc_Tos_dma, dma_cnt_ch_right);}IfxSrc_enable(src);restoreInterrupts(interrupt_state);
}
//任意两个有外部外部中断功能的引脚
void dma_cnt_init(ERU_PIN_enum pin_eru, uint8 l_or_r)
{dma_cnt_pin(pin_eru, l_or_r);//    配置dmaIfxDma_Dma_Config dmaConfig;IfxDma_Dma_initModuleConfig(&dmaConfig, &MODULE_DMA);IfxDma_Dma dma;IfxDma_Dma_initModule(&dma, &dmaConfig);IfxDma_Dma_ChannelConfig cfg;IfxDma_Dma_initChannelConfig(&cfg, &dma);cfg.transferCount = 10000;cfg.moveSize = IfxDma_ChannelMoveSize_8bit;cfg.blockMode = IfxDma_ChannelMove_1;cfg.requestMode = IfxDma_ChannelRequestMode_oneTransferPerRequest;cfg.hardwareRequestEnabled = TRUE;cfg.operationMode = IfxDma_ChannelOperationMode_continuous;/*************** 源地址和目标地址 ***************/cfg.sourceCircularBufferEnabled = TRUE;cfg.sourceAddressCircularRange = IfxDma_ChannelIncrementCircular_none;cfg.destinationCircularBufferEnabled = TRUE;cfg.destinationAddressCircularRange = IfxDma_ChannelIncrementCircular_none;/*************** Channel specific configurations ***************/if (l_or_r)cfg.channelId = (IfxDma_ChannelId)dma_cnt_ch_left;elsecfg.channelId = (IfxDma_ChannelId)dma_cnt_ch_right;cfg.busPriority = IfxDma_ChannelBusPriority_low;cfg.sourceAddress = IFXCPU_GLB_ADDR_DSPR(IfxCpu_getCoreId(), &dummy);cfg.destinationAddress = IFXCPU_GLB_ADDR_DSPR(IfxCpu_getCoreId(), &dummy);//禁用中断cfg.channelInterruptEnabled = FALSE;cfg.channelInterruptPriority = 0;if (l_or_r)IfxDma_Dma_initChannel(&dmaChn_cnt_left, &cfg);elseIfxDma_Dma_initChannel(&dmaChn_cnt_right, &cfg);
}int16 dma_cnt_read(uint8 l_or_r)
{Ifx_DMA_CH *ch;int16 speed;if (l_or_r){ch = dmaChn_cnt_left.channel;speed = 10000 - ch->CHCSR.B.TCOUNT;speed = speed == 10000 ? 0 : speed;MODULE_DMA.TSR[dmaChn_cnt_left.channelId].B.RST = 1;ch->CHCFGR.B.TREL = 10000;MODULE_DMA.TSR[dmaChn_cnt_left.channelId].B.ECH = 1;}else{ch = dmaChn_cnt_right.channel;speed = 10000 - ch->CHCSR.B.TCOUNT;speed = speed == 10000 ? 0 : speed;MODULE_DMA.TSR[dmaChn_cnt_right.channelId].B.RST = 1;ch->CHCFGR.B.TREL = 10000;MODULE_DMA.TSR[dmaChn_cnt_right.channelId].B.ECH = 1;}
//  printf("%d\n", speed);return speed;
}

DMA处理UART中断

尽量只用一个DMA通道进行传输，数据可能会错位。

Ifx_ASCLIN *DMA_UART_NUM         = &MODULE_ASCLIN2;
#define DMA_UART_TX_DB          ((uint8*)&(DMA_UART_NUM->TXDATA))
#define DMA_UART_TX_SB          ((uint8*)&My_Send_Data)
static IfxDma_Dma_Channel dmaChn_uart;
uint32 time = 0;
static uint8 uart2_tx_buffer[UART2_TX_BUFFER_SIZE + sizeof(Ifx_Fifo) + 8];
static uint8 uart2_rx_buffer[UART2_RX_BUFFER_SIZE + sizeof(Ifx_Fifo) + 8];
uint8 transfer_finish_flag = 0;
IFX_INTERRUPT(uart2_dma_tx_isr, 0, INTPRIO_DMA_UART)
{//禁用dmaenableInterrupts();transfer_finish_flag  = 1;IfxDma_disableChannelTransaction(&MODULE_DMA, dmaChn_uart.channelId);IfxDma_clearChannelInterrupt(&MODULE_DMA, dmaChn_uart.channelId);
}//内部调用
void transfer_init_uart(void)
{/* Initialize an instance of IfxAsclin_Asc_Config with default values */IfxAsclin_Asc_Config ascConfig;IfxAsclin_Asc_initModuleConfig(&ascConfig, &MODULE_ASCLIN2);/* Set the desired baud rate */ascConfig.baudrate.baudrate = data_uart_baud;/* ISR priorities and interrupt service provider */ascConfig.interrupt.txPriority = data_uart_dma_ch;ascConfig.interrupt.rxPriority = UART2_RX_INT_PRIO;ascConfig.interrupt.typeOfService = IfxSrc_Tos_dma;/* FIFO configuration */ascConfig.txBuffer = &uart2_tx_buffer;ascConfig.txBufferSize = UART2_TX_BUFFER_SIZE;ascConfig.rxBuffer = &uart2_rx_buffer;ascConfig.rxBufferSize = UART2_RX_BUFFER_SIZE;/* Pin configuration */const IfxAsclin_Asc_Pins pins ={NULL_PTR,                IfxPort_InputMode_pullUp,    /* CTS port pin not used   */&IfxAsclin2_RXE_P33_8_IN,   IfxPort_InputMode_pullUp,    /* RX port pin             */NULL_PTR,                   IfxPort_OutputMode_pushPull, /* RTS port pin not used   */&IfxAsclin2_TX_P33_9_OUT,   IfxPort_OutputMode_pushPull, /* TX port pin             */IfxPort_PadDriver_cmosAutomotiveSpeed1};ascConfig.pins = &pins;IfxAsclin_Asc_initModule(&uart2_handle, &ascConfig); /* Initialize module with above parameters                  */volatile Ifx_SRC_SRCR *src;src = IfxAsclin_getSrcPointerTx(ascConfig.asclin);IfxSrc_init(src, IfxSrc_Tos_dma, data_uart_dma_ch);IfxAsclin_enableTxFifoFillLevelFlag(ascConfig.asclin, TRUE);IfxSrc_enable(src);
}void transfer_init_dma(void)
{//配置dmaIfxDma_Dma_Config dmaConfig;IfxDma_Dma_initModuleConfig(&dmaConfig, &MODULE_DMA);IfxDma_Dma dma;IfxDma_Dma_initModule(&dma, &dmaConfig);IfxDma_Dma_ChannelConfig cfg;IfxDma_Dma_initChannelConfig(&cfg, &dma);cfg.transferCount = Send_Data_Len;                                                       //传输总字节数cfg.moveSize = IfxDma_ChannelMoveSize_8bit;                                                //每次传输字节数cfg.blockMode = IfxDma_ChannelMove_1;                                                 //每次只用一个dmacfg.requestMode = IfxDma_ChannelRequestMode_oneTransferPerRequest;                      //完整传输完后中断请求cfg.hardwareRequestEnabled = TRUE;                                                     //UART触发cfg.operationMode = IfxDma_ChannelOperationMode_single;                                    //触发一次/*************** 源地址和目标地址 ***************/cfg.sourceCircularBufferEnabled = FALSE;                                               //每次+1cfg.sourceAddressCircularRange = IfxDma_ChannelIncrementCircular_none;cfg.sourceAddressIncrementStep = IfxDma_ChannelIncrementStep_1;                          //一个字节cfg.destinationCircularBufferEnabled = TRUE;                                         //目标地址不变化cfg.destinationAddressCircularRange = IfxDma_ChannelIncrementCircular_none;/*************** Channel specific configurations ***************/cfg.channelId = (IfxDma_ChannelId) data_uart_dma_ch;                                 //选择通道cfg.sourceAddress = IFXCPU_GLB_ADDR_DSPR(IfxCpu_getCoreId(), DMA_UART_TX_SB);            //传输的源地址cfg.destinationAddress = IFXCPU_GLB_ADDR_DSPR(IfxCpu_getCoreId(), DMA_UART_TX_DB);     //目标地址cfg.channelInterruptEnabled = TRUE;/* DMA triggers an interrupt once the full transaction is done */cfg.channelInterruptControl = IfxDma_ChannelInterruptControl_thresholdLimitMatch;/* Priority of the channel interrupt trigger */cfg.channelInterruptPriority = INTPRIO_DMA_UART;/* Interrupt service provider */cfg.channelInterruptTypeOfService = IfxSrc_Tos_cpu0;IfxDma_Dma_initChannel(&dmaChn_uart, &cfg);
}void My_Data_Uart_Init(void)
{transfer_init_uart();transfer_init_dma();
}void send_to_computer(void)
{Ifx_DMA_CH *ch = dmaChn_uart.channel;ch->SADR.U = IFXCPU_GLB_ADDR_DSPR(IfxCpu_getCoreId(), DMA_UART_TX_SB);ch->CHCFGR.B.TREL = Send_Data_Len;//tx中断IfxDma_enableChannelTransaction(&MODULE_DMA, dmaChn_uart.channelId);DMA_UART_NUM->FLAGSSET.B.TFLS = 1;
}

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TC264 DMA相关部分代码

DMA

DMA计脉冲数

DMA处理UART中断

TC264 DMA相关部分代码相关推荐

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