Freesclae KL25黑 {MOD}的那块
开发板,用UART0可以实现DMA方式的发送,但是UART1不行,请问在设置UART0和UART1的时候有什么不同点呢?
下面是代码,请大神帮忙看一下
- //====================UART初始化===============================
- if (COM1==comX)
- {
- #ifndef USE_UART1_DMA_FT
- ASSERT(0);
- #endif
- // Enable Uart1 Clock
- SIM_SCGC4 |= SIM_SCGC4_UART1_MASK;
- SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK;
-
- if (PTE0 == UART1_TX_PORT)
- {// Enable the UART_TXD function on PTE0
- PORTE_PCR0 = PORT_PCR_MUX(0x3);
- }
- if (PTE1 == UART1_RX_PORT)
- {// Enable the UART_RXD function on PTE1
- PORTE_PCR1 = PORT_PCR_MUX(0x3);
- }
- }
- else
- {
- #ifndef USE_UART2_DMA_FT
- ASSERT(0);
- #endif
- // Enable Uart2 Clock
- SIM_SCGC4 |= SIM_SCGC4_UART2_MASK;
- SIM_SCGC5 |= SIM_SCGC5_PORTD_MASK;
-
- if (PTD3 == UART2_TX_PORT)
- {// Enable the UART_TXD function on PTD3
- PORTD_PCR3 = PORT_PCR_MUX(0x3);
- }
- if (PTD2 == UART2_RX_PORT)
- {// Enable the UART_RXD function on PTD2
- PORTD_PCR2 = PORT_PCR_MUX(0x3);
- }
- }
- // Diable Uart1 Tx Rx
- UART_C2_REG(m_uart_arr[comX]) &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK);
- // Configure the uart for 8-bit mode, no parity
- UART_C1_REG(m_uart_arr[comX]) = 0x00;
- // Baundrate setting
- l_sbr = (uint16_t)((periph_clk_khz*1000)/(boundRate * 16));
- l_temp = UART_BDH_REG(m_uart_arr[comX]) & ~(UART_BDH_SBR(0x1F));
- UART_BDH_REG(m_uart_arr[comX]) = l_temp | UART_BDH_SBR(((l_sbr & 0x1F00) >> 8));
- UART_BDL_REG(m_uart_arr[comX]) = (uint8_t)(l_sbr & UART_BDL_SBR_MASK);
-
- // Enable RX,IDLE Interrupt
- UART_C2_REG(m_uart_arr[comX]) |= UART_C2_ILIE_MASK | UART_C2_RIE_MASK;
- // Enable Uart1 DMA
- UART_C4_REG(m_uart_arr[comX]) |= UART_C4_TDMAS_MASK;
- enable_irq(UART0SE_irq_no+comX);
- // Enable Tx & Rx
- UART_C2_REG(m_uart_arr[comX]) |= (UART_C2_TE_MASK | UART_C2_RE_MASK);
- //====================UART初始化===============================
- //====================DMA初始化===============================
- static void dma_init(Uart_Com_Typedef comX)
- {
- ASSERT(IS_UART_COM(comX));
- // Enable dma clock
- SIM_SCGC6 |= SIM_SCGC6_DMAMUX_MASK;
- SIM_SCGC7 |= SIM_SCGC7_DMA_MASK;
- // Config DMA Mux for UART operation
- // Disable DMA Mux channel
- DMAMUX_CHCFG_REG(DMAMUX0_BASE_PTR, comX) &= ~DMAMUX_CHCFG_ENBL_MASK;
-
- // Clear pending errors and/or the done bit
- if (((DMA_DSR_BCR_REG(DMA_BASE_PTR, comX) & DMA_DSR_BCR_DONE_MASK) == DMA_DSR_BCR_DONE_MASK)
- || ((DMA_DSR_BCR_REG(DMA_BASE_PTR, comX) & DMA_DSR_BCR_BES_MASK) == DMA_DSR_BCR_BES_MASK)
- || ((DMA_DSR_BCR_REG(DMA_BASE_PTR, comX) & DMA_DSR_BCR_BED_MASK) == DMA_DSR_BCR_BED_MASK)
- || ((DMA_DSR_BCR_REG(DMA_BASE_PTR, comX) & DMA_DSR_BCR_CE_MASK) == DMA_DSR_BCR_CE_MASK))
- {
- DMA_DSR_BCR_REG(DMA_BASE_PTR, comX) |= DMA_DSR_BCR_DONE_MASK;
- }
- // Clear Source size and Destination size fields.
- DMA_DCR_REG(DMA_BASE_PTR,comX) &= ~(DMA_DCR_SSIZE_MASK
- | DMA_DCR_DSIZE_MASK
- );
- // Set DMA as follows:
- // Source size is byte size
- // Destination size is byte size
- // D_REQ cleared automatically by hardware
- // Destination address will be incremented after each transfer
- // Cycle Steal mode
- // External Requests are enabled
- // Asynchronous DMA requests are enabled.
- // Enable DMA Interrupt
- DMA_DCR_REG(DMA_BASE_PTR,comX)|= (
- DMA_DCR_SSIZE(1)
- | DMA_DCR_DSIZE(1)
- | DMA_DCR_SINC_MASK
- | DMA_DCR_CS_MASK
- // | DMA_DCR_ERQ_MASK
- | DMA_DCR_EINT_MASK
- );
-
- // Set destination Address (this is the UARTx_D register)
- if (COM0==comX)
- {
- DMA_DAR_REG(DMA_BASE_PTR,comX) = UART0_D_ADDRESS;
- }
- else if (COM1==comX)
- {
- DMA_DAR_REG(DMA_BASE_PTR,comX) = UART1_D_ADDRESS;
- }
- else
- {
- DMA_DAR_REG(DMA_BASE_PTR,comX) = UART2_D_ADDRESS;
- }
- // Set source address
- DMA_SAR_REG(DMA_BASE_PTR,comX) = (uint32_t)&(m_uart_tx_buf[comX][0]);
- // Select the DMA Channel Source
- DMAMUX_CHCFG_REG(DMAMUX0_BASE_PTR,comX) = 0x03+2*comX;
- DMAMUX_CHCFG_REG(DMAMUX0_BASE_PTR,comX) |= DMAMUX_CHCFG_ENBL_MASK;
- // Enable DMA interrupt
- enable_irq(DMA0_irq_no+comX);
- }
- //=================DMA初始化==================================
- //=================发送==============================
- uint8_t uart_send_data(Uart_Com_Typedef comX, uint8_t *pData, uint32_t len)
- {
- uint32_t i=0;
-
- ASSERT(IS_UART_COM(comX) && pData && len>0 && len<UART_TXBUF_SIZE);
- m_transmit_complete_flag[comX] = 0;
- // Set BCR to know how many bytes to transfer
- DMA_DSR_BCR(comX) = DMA_DSR_BCR_BCR(len);
- memset(m_uart_tx_buf[comX], 0x00, sizeof(m_uart_tx_buf[comX]));
- memcpy(m_uart_tx_buf[comX], pData, len);
- // Enables the DMA channel
- //DMAMUX_CHCFG_REG(DMAMUX0_BASE_PTR, comX) |= DMAMUX_CHCFG_ENBL_MASK;
- DMA_DCR_REG(DMA_BASE_PTR,comX) |= DMA_DCR_ERQ_MASK;
- while (i++<0xffffff && !m_transmit_complete_flag[comX]);
- if (m_transmit_complete_flag[comX])
- {
- return len;
- }
-
- return 0;
- }
- //==========================================================
- //================DMA中断======================================
- void DMA1_IRQHandler(void)
- {
- // Clear pending errors or the done bit
- if (((DMA_DSR_BCR1 & DMA_DSR_BCR_DONE_MASK) == DMA_DSR_BCR_DONE_MASK)
- || ((DMA_DSR_BCR1 & DMA_DSR_BCR_BES_MASK) == DMA_DSR_BCR_BES_MASK)
- || ((DMA_DSR_BCR1 & DMA_DSR_BCR_BED_MASK) == DMA_DSR_BCR_BED_MASK)
- || ((DMA_DSR_BCR1 & DMA_DSR_BCR_CE_MASK) == DMA_DSR_BCR_CE_MASK))
- {
- // Enable DMA1
- DMA_DCR_REG(DMA_BASE_PTR,COM1) &= ~DMA_DCR_ERQ_MASK;
- // Set source address
- DMA_SAR_REG(DMA_BASE_PTR,COM1) = (uint32_t)&(m_uart_tx_buf[COM1][0]);
- DMA_DSR_BCR1 |= DMA_DSR_BCR_DONE_MASK;
- }
-
- // Set transmit ok flag
- m_transmit_complete_flag[COM1] = 1;
- }
复制代码
D7(TDMAS)—发送器DMA选择。如果TIE①被置位,TDMAS将配置发送数据寄存器空标志位(TDRE②)来形成中断或者DMA请求。说明:如果UART_C2[TIE]被清零,那TDRE DMA和TDRE中断信号在TDRE标志置位时无效,并且无视TDMAS的状态。如果TIE和TDMAS同时被置位,然后UART_C2[TCIE]必须被清零。并且UART_D在服务一个DMA请求时不能被写入。TDMAS=0,如果TIE和TDRE标志位被置位,TDRE中断信号触发中断服务例程;TDMAS=1,如果TIE被置位而且TDRE标志位被置位,TDRE DMA请求信号将会请求一个DMA传输器。
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