/**************************************************************************//** * * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2020-12-12 Wayne First version * ******************************************************************************/ #include #if defined(BSP_USING_UART) #include #include #include "NuMicro.h" #include #include #if defined(RT_SERIAL_USING_DMA) #include #endif /* Private define ---------------------------------------------------------------*/ enum { UART_START = -1, #if defined(BSP_USING_UART0) UART0_IDX, #endif #if defined(BSP_USING_UART1) UART1_IDX, #endif #if defined(BSP_USING_UART2) UART2_IDX, #endif #if defined(BSP_USING_UART3) UART3_IDX, #endif #if defined(BSP_USING_UART4) UART4_IDX, #endif #if defined(BSP_USING_UART5) UART5_IDX, #endif #if defined(BSP_USING_UART6) UART6_IDX, #endif #if defined(BSP_USING_UART7) UART7_IDX, #endif #if defined(BSP_USING_UART8) UART8_IDX, #endif #if defined(BSP_USING_UART9) UART9_IDX, #endif UART_CNT }; /* Private typedef --------------------------------------------------------------*/ struct nu_uart { rt_serial_t dev; char *name; UART_T *uart_base; IRQn_Type irqn; E_SYS_IPRST rstidx; E_SYS_IPCLK clkidx; #if defined(RT_SERIAL_USING_DMA) uint32_t dma_flag; int16_t pdma_perp_tx; int8_t pdma_chanid_tx; int16_t pdma_perp_rx; int8_t pdma_chanid_rx; int32_t rx_write_offset; int32_t rxdma_trigger_len; nu_pdma_desc_t pdma_rx_desc; #endif }; typedef struct nu_uart *nu_uart_t; /* Private functions ------------------------------------------------------------*/ static rt_err_t nu_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg); static rt_err_t nu_uart_control(struct rt_serial_device *serial, int cmd, void *arg); static int nu_uart_send(struct rt_serial_device *serial, char c); static int nu_uart_receive(struct rt_serial_device *serial); #if defined(RT_SERIAL_USING_DMA) static rt_size_t nu_uart_dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction); static void nu_pdma_uart_rx_cb(void *pvOwner, uint32_t u32Events); static void nu_pdma_uart_tx_cb(void *pvOwner, uint32_t u32Events); #endif /* Public functions ------------------------------------------------------------*/ /* Private variables ------------------------------------------------------------*/ static const struct rt_uart_ops nu_uart_ops = { .configure = nu_uart_configure, .control = nu_uart_control, .putc = nu_uart_send, .getc = nu_uart_receive, #if defined(RT_SERIAL_USING_DMA) .dma_transmit = nu_uart_dma_transmit #else .dma_transmit = RT_NULL #endif }; static const struct serial_configure nu_uart_default_config = RT_SERIAL_CONFIG_DEFAULT; static struct nu_uart nu_uart_arr [] = { #if defined(BSP_USING_UART0) { .name = "uart0", .uart_base = UART0, .irqn = IRQ_UART0, .rstidx = UART0RST, .clkidx = UART0CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART0_TX_DMA) .pdma_perp_tx = PDMA_UART0_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART0_RX_DMA) .pdma_perp_rx = PDMA_UART0_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART1) { .name = "uart1", .uart_base = UART1, .irqn = IRQ_UART1, .rstidx = UART1RST, .clkidx = UART1CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART1_TX_DMA) .pdma_perp_tx = PDMA_UART1_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART1_RX_DMA) .pdma_perp_rx = PDMA_UART1_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART2) { .name = "uart2", .uart_base = UART2, .irqn = IRQ_UART2, .rstidx = UART2RST, .clkidx = UART2CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART2_TX_DMA) .pdma_perp_tx = PDMA_UART2_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART2_RX_DMA) .pdma_perp_rx = PDMA_UART2_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART3) { .name = "uart3", .uart_base = UART3, .irqn = IRQ_UART3, .rstidx = UART3RST, .clkidx = UART3CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART3_TX_DMA) .pdma_perp_tx = PDMA_UART3_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART3_RX_DMA) .pdma_perp_rx = PDMA_UART3_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART4) { .name = "uart4", .uart_base = UART4, .irqn = IRQ_UART4, .rstidx = UART4RST, .clkidx = UART4CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART4_TX_DMA) .pdma_perp_tx = PDMA_UART4_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART4_RX_DMA) .pdma_perp_rx = PDMA_UART4_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART5) { .name = "uart5", .uart_base = UART5, .irqn = IRQ_UART5, .rstidx = UART5RST, .clkidx = UART5CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART5_TX_DMA) .pdma_perp_tx = PDMA_UART5_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART5_RX_DMA) .pdma_perp_rx = PDMA_UART5_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART6) { .name = "uart6", .uart_base = UART6, .irqn = IRQ_UART6, .rstidx = UART6RST, .clkidx = UART6CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART6_TX_DMA) .pdma_perp_tx = PDMA_UART6_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART6_RX_DMA) .pdma_perp_rx = PDMA_UART6_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART7) { .name = "uart7", .uart_base = UART7, .irqn = IRQ_UART7, .rstidx = UART7RST, .clkidx = UART7CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART7_TX_DMA) .pdma_perp_tx = PDMA_UART7_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART7_RX_DMA) .pdma_perp_rx = PDMA_UART7_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART8) { .name = "uart8", .uart_base = UART8, .irqn = IRQ_UART8, .rstidx = UART8RST, .clkidx = UART8CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART8_TX_DMA) .pdma_perp_tx = PDMA_UART8_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART8_RX_DMA) .pdma_perp_rx = PDMA_UART8_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif #if defined(BSP_USING_UART9) { .name = "uart9", .uart_base = UART9, .irqn = IRQ_UART9, .rstidx = UART9RST, .clkidx = UART9CKEN, #if defined(RT_SERIAL_USING_DMA) #if defined(BSP_USING_UART9_TX_DMA) .pdma_perp_tx = PDMA_UART9_TX, #else .pdma_perp_tx = NU_PDMA_UNUSED, #endif #if defined(BSP_USING_UART9_RX_DMA) .pdma_perp_rx = PDMA_UART9_RX, .rx_write_offset = 0, #else .pdma_perp_rx = NU_PDMA_UNUSED, #endif #endif }, #endif }; /* uart nu_uart */ /** * All UART interrupt service routine */ static void nu_uart_isr(int vector, void *param) { /* Get base address of uart register */ nu_uart_t serial = (nu_uart_t)param; UART_T *uart_base = ((nu_uart_t)serial)->uart_base; /* Get interrupt event */ uint32_t u32IntSts = uart_base->INTSTS; uint32_t u32FIFOSts = uart_base->FIFOSTS; #if defined(RT_SERIAL_USING_DMA) if (u32IntSts & UART_INTSTS_HWRLSIF_Msk) { /* Drain RX FIFO to remove remain FEF frames in FIFO. */ uart_base->FIFO |= UART_FIFO_RXRST_Msk; uart_base->FIFOSTS |= (UART_FIFOSTS_BIF_Msk | UART_FIFOSTS_FEF_Msk | UART_FIFOSTS_PEF_Msk); return; } #endif /* Handle RX event */ if (u32IntSts & (UART_INTSTS_RDAINT_Msk | UART_INTSTS_RXTOINT_Msk)) { rt_hw_serial_isr(&serial->dev, RT_SERIAL_EVENT_RX_IND); } uart_base->INTSTS = u32IntSts; uart_base->FIFOSTS = u32FIFOSts; } /** * Set RS-485 AUD mode */ void nu_uart_set_rs485aud(struct rt_serial_device *serial, rt_bool_t bRTSActiveLowLevel) { UART_T *uart_base; RT_ASSERT(serial != RT_NULL); /* Get base address of uart register */ uart_base = ((nu_uart_t)serial)->uart_base; /* Set RTS as RS-485 phy direction controlling ping. */ UART_SelectRS485Mode(uart_base, UART_ALTCTL_RS485AUD_Msk, 0); if (bRTSActiveLowLevel) { /* Set direction pin as active-low. */ uart_base->MODEM |= UART_MODEM_RTSACTLV_Msk; } else { /* Set direction pin as active-high. */ uart_base->MODEM &= ~UART_MODEM_RTSACTLV_Msk; } rt_kprintf("Set %s to RS-485 AUD function mode. ActiveLowLevel-%s\n", ((nu_uart_t)serial)->name, bRTSActiveLowLevel ? "YES" : "NO"); } /** * Configure uart port */ static rt_err_t nu_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg) { rt_err_t ret = RT_EOK; uint32_t uart_word_len = 0; uint32_t uart_stop_bit = 0; uint32_t uart_parity = 0; /* Get base address of uart register */ UART_T *uart_base = ((nu_uart_t)serial)->uart_base; /* Check baudrate */ RT_ASSERT(cfg->baud_rate != 0); /* Check word len */ switch (cfg->data_bits) { case DATA_BITS_5: uart_word_len = UART_WORD_LEN_5; break; case DATA_BITS_6: uart_word_len = UART_WORD_LEN_6; break; case DATA_BITS_7: uart_word_len = UART_WORD_LEN_7; break; case DATA_BITS_8: uart_word_len = UART_WORD_LEN_8; break; default: rt_kprintf("Unsupported data length"); ret = RT_EINVAL; goto exit_nu_uart_configure; } /* Check stop bit */ switch (cfg->stop_bits) { case STOP_BITS_1: uart_stop_bit = UART_STOP_BIT_1; break; case STOP_BITS_2: uart_stop_bit = UART_STOP_BIT_2; break; default: rt_kprintf("Unsupported stop bit"); ret = RT_EINVAL; goto exit_nu_uart_configure; } /* Check parity */ switch (cfg->parity) { case PARITY_NONE: uart_parity = UART_PARITY_NONE; break; case PARITY_ODD: uart_parity = UART_PARITY_ODD; break; case PARITY_EVEN: uart_parity = UART_PARITY_EVEN; break; default: rt_kprintf("Unsupported parity"); ret = RT_EINVAL; goto exit_nu_uart_configure; } nu_sys_ip_reset(((nu_uart_t)serial)->rstidx); /* Open Uart and set UART Baudrate */ UART_Open(uart_base, cfg->baud_rate); /* Set line configuration. */ UART_SetLineConfig(uart_base, 0, uart_word_len, uart_parity, uart_stop_bit); /* Enable interrupt. */ rt_hw_interrupt_umask(((nu_uart_t)serial)->irqn); exit_nu_uart_configure: if (ret != RT_EOK) UART_Close(uart_base); return -(ret); } #if defined(RT_SERIAL_USING_DMA) static rt_err_t nu_pdma_uart_rx_config(struct rt_serial_device *serial, uint8_t *pu8Buf, int32_t i32TriggerLen) { rt_err_t result = RT_EOK; struct nu_pdma_chn_cb sChnCB; nu_uart_t psNuUart = (nu_uart_t)serial; /* Get base address of uart register */ UART_T *uart_base = psNuUart->uart_base; /* Register ISR callback function */ sChnCB.m_eCBType = eCBType_Event; sChnCB.m_pfnCBHandler = nu_pdma_uart_rx_cb; sChnCB.m_pvUserData = (void *)serial; nu_pdma_filtering_set(psNuUart->pdma_chanid_rx, NU_PDMA_EVENT_TRANSFER_DONE | NU_PDMA_EVENT_TIMEOUT); result = nu_pdma_callback_register(psNuUart->pdma_chanid_rx, &sChnCB); if (result != RT_EOK) { goto exit_nu_pdma_uart_rx_config; } if (serial->config.bufsz == 0) { result = nu_pdma_transfer(((nu_uart_t)serial)->pdma_chanid_rx, 8, (uint32_t)uart_base, (uint32_t)pu8Buf, i32TriggerLen, 1000); //Idle-timeout, 1ms if (result != RT_EOK) { goto exit_nu_pdma_uart_rx_config; } } else { /* For Serial RX FIFO - Single buffer recycle SG trigger */ /* Link to next */ nu_pdma_desc_t next = psNuUart->pdma_rx_desc; result = nu_pdma_desc_setup(psNuUart->pdma_chanid_rx, psNuUart->pdma_rx_desc, 8, (uint32_t)uart_base, (uint32_t)pu8Buf, i32TriggerLen, next, 0); if (result != RT_EOK) { goto exit_nu_pdma_uart_rx_config; } /* Assign head descriptor & go */ result = nu_pdma_sg_transfer(psNuUart->pdma_chanid_rx, psNuUart->pdma_rx_desc, 1000); if (result != RT_EOK) { goto exit_nu_pdma_uart_rx_config; } } /* Enable Receive Line interrupt & Start DMA RX transfer. */ UART_ENABLE_INT(uart_base, UART_INTEN_RLSIEN_Msk | UART_INTEN_RXPDMAEN_Msk); exit_nu_pdma_uart_rx_config: return result; } static void nu_pdma_uart_rx_cb(void *pvOwner, uint32_t u32Events) { rt_size_t recv_len = 0; rt_size_t transferred_rxbyte = 0; struct rt_serial_device *serial = (struct rt_serial_device *)pvOwner; nu_uart_t puart = (nu_uart_t)serial; RT_ASSERT(serial != RT_NULL); /* Get base address of uart register */ UART_T *uart_base = puart->uart_base; transferred_rxbyte = nu_pdma_transferred_byte_get(puart->pdma_chanid_rx, puart->rxdma_trigger_len); if (u32Events & (NU_PDMA_EVENT_TRANSFER_DONE | NU_PDMA_EVENT_TIMEOUT)) { #if defined(BSP_USING_MMU) struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx; #endif if (u32Events & NU_PDMA_EVENT_TRANSFER_DONE) { transferred_rxbyte = puart->rxdma_trigger_len; } else if ((u32Events & NU_PDMA_EVENT_TIMEOUT) && !UART_GET_RX_EMPTY(uart_base)) { return; } recv_len = transferred_rxbyte - puart->rx_write_offset; #if defined(BSP_USING_MMU) mmu_invalidate_dcache((uint32_t)&rx_fifo->buffer[puart->rx_write_offset], recv_len); #endif puart->rx_write_offset = transferred_rxbyte % puart->rxdma_trigger_len; } if ((serial->config.bufsz == 0) && (u32Events & NU_PDMA_EVENT_TRANSFER_DONE)) { recv_len = puart->rxdma_trigger_len; } if (recv_len) { rt_hw_serial_isr(&puart->dev, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8)); } } static rt_err_t nu_pdma_uart_tx_config(struct rt_serial_device *serial) { struct nu_pdma_chn_cb sChnCB; RT_ASSERT(serial != RT_NULL); /* Register ISR callback function */ sChnCB.m_eCBType = eCBType_Event; sChnCB.m_pfnCBHandler = nu_pdma_uart_tx_cb; sChnCB.m_pvUserData = (void *)serial; nu_pdma_filtering_set(((nu_uart_t)serial)->pdma_chanid_tx, NU_PDMA_EVENT_TRANSFER_DONE); return nu_pdma_callback_register(((nu_uart_t)serial)->pdma_chanid_tx, &sChnCB); } static void nu_pdma_uart_tx_cb(void *pvOwner, uint32_t u32Events) { nu_uart_t puart = (nu_uart_t)pvOwner; RT_ASSERT(puart != RT_NULL); UART_DISABLE_INT(puart->uart_base, UART_INTEN_TXPDMAEN_Msk);// Stop DMA TX transfer if (u32Events & NU_PDMA_EVENT_TRANSFER_DONE) { rt_hw_serial_isr(&puart->dev, RT_SERIAL_EVENT_TX_DMADONE); } } /** * Uart DMA transfer */ static rt_size_t nu_uart_dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction) { rt_err_t result = RT_EOK; nu_uart_t psNuUart = (nu_uart_t)serial; RT_ASSERT(serial != RT_NULL); RT_ASSERT(buf != RT_NULL); /* Get base address of uart register */ UART_T *uart_base = psNuUart->uart_base; if (direction == RT_SERIAL_DMA_TX) { result = nu_pdma_transfer(psNuUart->pdma_chanid_tx, 8, (uint32_t)buf, (uint32_t)uart_base, size, 0); // wait-forever UART_ENABLE_INT(uart_base, UART_INTEN_TXPDMAEN_Msk);// Start DMA TX transfer } else if (direction == RT_SERIAL_DMA_RX) { UART_DISABLE_INT(uart_base, UART_INTEN_RLSIEN_Msk | UART_INTEN_RXPDMAEN_Msk); // Start DMA TX transfer // If config.bufsz = 0, serial will trigger once. psNuUart->rxdma_trigger_len = size; psNuUart->rx_write_offset = 0; result = nu_pdma_uart_rx_config(serial, buf, size); } else { result = RT_ERROR; } return result; } static int nu_hw_uart_dma_allocate(nu_uart_t pusrt) { RT_ASSERT(pusrt != RT_NULL); /* Allocate UART_TX nu_dma channel */ if (pusrt->pdma_perp_tx != NU_PDMA_UNUSED) { pusrt->pdma_chanid_tx = nu_pdma_channel_allocate(pusrt->pdma_perp_tx); if (pusrt->pdma_chanid_tx >= 0) { pusrt->dma_flag |= RT_DEVICE_FLAG_DMA_TX; } } /* Allocate UART_RX nu_dma channel */ if (pusrt->pdma_perp_rx != NU_PDMA_UNUSED) { pusrt->pdma_chanid_rx = nu_pdma_channel_allocate(pusrt->pdma_perp_rx); if (pusrt->pdma_chanid_rx >= 0) { rt_err_t ret = RT_EOK; pusrt->dma_flag |= RT_DEVICE_FLAG_DMA_RX; ret = nu_pdma_sgtbls_allocate(&pusrt->pdma_rx_desc, 1); RT_ASSERT(ret == RT_EOK); } } return RT_EOK; } #endif /** * Uart interrupt control */ static rt_err_t nu_uart_control(struct rt_serial_device *serial, int cmd, void *arg) { nu_uart_t psNuUart = (nu_uart_t)serial; rt_err_t result = RT_EOK; rt_uint32_t flag; rt_ubase_t ctrl_arg = (rt_ubase_t)arg; RT_ASSERT(serial != RT_NULL); /* Get base address of uart register */ UART_T *uart_base = psNuUart->uart_base; switch (cmd) { case RT_DEVICE_CTRL_CLR_INT: if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Disable INT-RX */ { flag = UART_INTEN_RDAIEN_Msk | UART_INTEN_RXTOIEN_Msk | UART_INTEN_TOCNTEN_Msk; UART_DISABLE_INT(uart_base, flag); } else if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX) /* Disable DMA-RX */ { /* Disable Receive Line interrupt & Stop DMA RX transfer. */ #if defined(RT_SERIAL_USING_DMA) nu_pdma_channel_terminate(psNuUart->pdma_chanid_rx); UART_DISABLE_INT(uart_base, UART_INTEN_RLSIEN_Msk | UART_INTEN_RXPDMAEN_Msk); #endif } break; case RT_DEVICE_CTRL_SET_INT: if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Enable INT-RX */ { flag = UART_INTEN_RDAIEN_Msk | UART_INTEN_RXTOIEN_Msk | UART_INTEN_TOCNTEN_Msk; UART_ENABLE_INT(uart_base, flag); } break; #if defined(RT_SERIAL_USING_DMA) case RT_DEVICE_CTRL_CONFIG: if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX) /* Configure and trigger DMA-RX */ { struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx; psNuUart->rxdma_trigger_len = serial->config.bufsz; psNuUart->rx_write_offset = 0; result = nu_pdma_uart_rx_config(serial, &rx_fifo->buffer[0], psNuUart->rxdma_trigger_len); // Config & trigger } else if (ctrl_arg == RT_DEVICE_FLAG_DMA_TX) /* Configure DMA-TX */ { result = nu_pdma_uart_tx_config(serial); } break; #endif case RT_DEVICE_CTRL_CLOSE: /* Disable interrupt. */ rt_hw_interrupt_mask(psNuUart->irqn); #if defined(RT_SERIAL_USING_DMA) nu_pdma_channel_terminate(psNuUart->pdma_chanid_tx); nu_pdma_channel_terminate(psNuUart->pdma_chanid_rx); #endif /* Close UART port */ UART_Close(uart_base); break; default: result = -RT_EINVAL; break; } return result; } /** * Uart put char */ static int nu_uart_send(struct rt_serial_device *serial, char c) { RT_ASSERT(serial != RT_NULL); /* Get base address of uart register */ UART_T *uart_base = ((nu_uart_t)serial)->uart_base; /* Waiting if TX-FIFO is full. */ while (UART_IS_TX_FULL(uart_base)); /* Put char into TX-FIFO */ UART_WRITE(uart_base, c); return 1; } /** * Uart get char */ static int nu_uart_receive(struct rt_serial_device *serial) { RT_ASSERT(serial != RT_NULL); /* Get base address of uart register */ UART_T *uart_base = ((nu_uart_t)serial)->uart_base; /* Return failure if RX-FIFO is empty. */ if (UART_GET_RX_EMPTY(uart_base)) { return -1; } /* Get char from RX-FIFO */ return UART_READ(uart_base); } /** * Hardware UART Initialization */ rt_err_t rt_hw_uart_init(void) { int i; rt_uint32_t flag; rt_err_t ret = RT_EOK; for (i = (UART_START + 1); i < UART_CNT; i++) { flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX; nu_uart_arr[i].dev.ops = &nu_uart_ops; nu_uart_arr[i].dev.config = nu_uart_default_config; #if defined(RT_SERIAL_USING_DMA) nu_uart_arr[i].dma_flag = 0; nu_hw_uart_dma_allocate(&nu_uart_arr[i]); flag |= nu_uart_arr[i].dma_flag; #endif rt_hw_interrupt_install(nu_uart_arr[i].irqn, nu_uart_isr, &nu_uart_arr[i], nu_uart_arr[i].name); nu_sys_ipclk_enable(nu_uart_arr[i].clkidx); ret = rt_hw_serial_register(&nu_uart_arr[i].dev, nu_uart_arr[i].name, flag, NULL); RT_ASSERT(ret == RT_EOK); } return ret; } #endif //#if defined(BSP_USING_UART)