/**************************************************************************** * arch/arm/src/nuc1xx/nuc_serial.c * * Copyright (C) 2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #ifdef CONFIG_SERIAL_TERMIOS # include #endif #include #include #include #include #include #include "up_arch.h" #include "os_internal.h" #include "up_internal.h" #include "chip.h" #include "chip/nuc_uart.h" #include "nuc_serial.h" /**************************************************************************** * Pre-processor definitions ****************************************************************************/ /* If we are not using the serial driver for the console, then we still must * provide some minimal implementation of up_putc. */ #if defined(USE_SERIALDRIVER) && defined(HAVE_UART) /* Configuration ************************************************************/ /**************************************************************************** * Private Types ****************************************************************************/ struct nuc_dev_s { uint32_t uartbase; /* Base address of UART registers */ uint32_t baud; /* Configured baud */ uint32_t ier; /* Saved IER value */ uint8_t irq; /* IRQ associated with this UART */ uint8_t parity; /* 0=none, 1=odd, 2=even */ uint8_t bits; /* Number of bits (5-8) */ uint8_t depth; /* RX/TX FIFO depth */ bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int up_setup(struct uart_dev_s *dev); static void up_shutdown(struct uart_dev_s *dev); static int up_attach(struct uart_dev_s *dev); static void up_detach(struct uart_dev_s *dev); static int up_interrupt(int irq, void *context); static int up_ioctl(struct file *filep, int cmd, unsigned long arg); static int up_receive(struct uart_dev_s *dev, uint32_t *status); static void up_rxint(struct uart_dev_s *dev, bool enable); static bool up_rxavailable(struct uart_dev_s *dev); static void up_send(struct uart_dev_s *dev, int ch); static void up_txint(struct uart_dev_s *dev, bool enable); static bool up_txready(struct uart_dev_s *dev); static bool up_txempty(struct uart_dev_s *dev); /**************************************************************************** * Private Variables ****************************************************************************/ struct uart_ops_s g_uart_ops = { .setup = up_setup, .shutdown = up_shutdown, .attach = up_attach, .detach = up_detach, .ioctl = up_ioctl, .receive = up_receive, .rxint = up_rxint, .rxavailable = up_rxavailable, .send = up_send, .txint = up_txint, .txready = up_txready, .txempty = up_txempty, }; /* I/O buffers */ #ifdef CONFIG_NUC_UART0 static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE]; static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE]; #endif #ifdef CONFIG_NUC_UART1 static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE]; static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE]; #endif #ifdef CONFIG_NUC_UART2 static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE]; static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE]; #endif #ifdef CONFIG_NUC_UART3 static char g_uart3rxbuffer[CONFIG_UART3_RXBUFSIZE]; static char g_uart3txbuffer[CONFIG_UART3_TXBUFSIZE]; #endif /* This describes the state of the LPC17xx uart0 port. */ #ifdef CONFIG_NUC_UART0 static struct nuc_dev_s g_uart0priv = { .uartbase = NUC_UART0_BASE, .baud = CONFIG_UART0_BAUD, .irq = NUC_IRQ_UART0, .parity = CONFIG_UART0_PARITY, .bits = CONFIG_UART0_BITS, .depth = UART0_FIFO_DEPTH, .stopbits2 = CONFIG_UART0_2STOP, }; static uart_dev_t g_uart0port = { .recv = { .size = CONFIG_UART0_RXBUFSIZE, .buffer = g_uart0rxbuffer, }, .xmit = { .size = CONFIG_UART0_TXBUFSIZE, .buffer = g_uart0txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart0priv, }; #endif /* This describes the state of the LPC17xx uart1 port. */ #ifdef CONFIG_NUC_UART1 static struct nuc_dev_s g_uart1priv = { .uartbase = NUC_UART1_BASE, .baud = CONFIG_UART1_BAUD, .irq = NUC_IRQ_UART1, .parity = CONFIG_UART1_PARITY, .bits = CONFIG_UART1_BITS, .depth = UART1_FIFO_DEPTH, .stopbits2 = CONFIG_UART1_2STOP, }; static uart_dev_t g_uart1port = { .recv = { .size = CONFIG_UART1_RXBUFSIZE, .buffer = g_uart1rxbuffer, }, .xmit = { .size = CONFIG_UART1_TXBUFSIZE, .buffer = g_uart1txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart1priv, }; #endif /* This describes the state of the LPC17xx uart1 port. */ #ifdef CONFIG_NUC_UART2 static struct nuc_dev_s g_uart2priv = { .uartbase = NUC_UART2_BASE, .baud = CONFIG_UART2_BAUD, .irq = NUC_IRQ_UART2, .parity = CONFIG_UART2_PARITY, .bits = CONFIG_UART2_BITS, .depth = UART2_FIFO_DEPTH, .stopbits2 = CONFIG_UART2_2STOP, }; static uart_dev_t g_uart2port = { .recv = { .size = CONFIG_UART2_RXBUFSIZE, .buffer = g_uart2rxbuffer, }, .xmit = { .size = CONFIG_UART2_TXBUFSIZE, .buffer = g_uart2txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart2priv, }; #endif /* Which UART with be tty0/console and which tty1? tty2? */ #ifdef HAVE_CONSOLE # if defined(CONFIG_UART0_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart0port /* UART0=console */ # define TTYS0_DEV g_uart0port /* UART0=ttyS0 */ # ifdef CONFIG_NUC_UART1 # define TTYS1_DEV g_uart1port /* UART0=ttyS0;UART1=ttyS1 */ # ifdef CONFIG_NUC_UART2 # define TTYS2_DEV g_uart2port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2 */ # else # undef TTYS2_DEV /* UART0=ttyS0;UART1=ttyS1;No ttyS2*/ # endif # else # ifdef CONFIG_NUC_UART2 # define TTYS1_DEV g_uart2port /* UART0=ttyS0;UART2=ttyS1 */ # undef TTYS2_DEV /* UART0=ttyS0;UART2=ttyS1;No ttyS2*/ # else # undef TTYS1_DEV /* UART0=ttyS0;No ttyS1;No ttyS2 */ # undef TTYS2_DEV /* No ttyS2 */ # endif # endif # elif defined(CONFIG_UART1_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart1port /* UART1=console */ # define TTYS0_DEV g_uart1port /* UART1=ttyS0 */ # ifdef CONFIG_NUC_UART0 # define TTYS1_DEV g_uart0port /* UART1=ttyS0;UART0=ttyS1 */ # ifdef CONFIG_NUC_UART2 # define TTYS2_DEV g_uart2port /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS2 */ # else # undef TTYS2_DEV /* UART1=ttyS0;UART0=ttyS1;No ttyS2 */ # endif # else # ifdef CONFIG_NUC_UART2 # define TTYS1_DEV g_uart2port /* UART1=ttyS0;UART2=ttyS1 */ # undef TTYS2_DEV /* UART1=ttyS0;UART2=ttyS1;No ttyS2 */ # else # undef TTYS1_DEV /* UART1=ttyS0;No ttyS1;No ttyS2 */ # undef TTYS2_DEV /* No ttyS2 */ # endif # endif # elif defined(CONFIG_UART2_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart2port /* UART2=console */ # define TTYS0_DEV g_uart2port /* UART2=ttyS0 */ # ifdef CONFIG_NUC_UART2 # define TTYS1_DEV g_uart0port /* UART2=ttyS0;UART0=ttyS1 */ # ifdef CONFIG_NUC_UART1 # define TTYS2_DEV g_uart1port /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS2 */ # else # undef TTYS2_DEV /* UART2=ttyS0;UART0=ttyS1;No ttyS2 */ # endif # else # ifdef CONFIG_NUC_UART1 # define TTYS1_DEV g_uart1port /* UART2=ttyS0;UART1=ttyS1 */ # undef TTYS2_DEV /* UART2=ttyS0;UART1=ttyS1;No ttyS2 */ # else # undef TTYS1_DEV /* UART2=ttyS0;No ttyS1;No ttyS2 */ # undef TTYS2_DEV /* No ttyS2 */ # endif # endif #else /* No console */ # define TTYS0_DEV g_uart0port /* UART0=ttyS0 */ # ifdef CONFIG_NUC_UART1 # define TTYS1_DEV g_uart1port /* UART0=ttyS0;UART1=ttyS1 */ # ifdef CONFIG_NUC_UART2 # define TTYS2_DEV g_uart2port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2 */ # else # undef TTYS2_DEV /* UART0=ttyS0;UART1=ttyS1;No ttyS2 */ # endif # else # ifdef CONFIG_NUC_UART2 # define TTYS1_DEV g_uart2port /* UART0=ttyS0;UART2=ttyS1 */ # undef TTYS2_DEV /* UART0=ttyS0;UART2=ttyS1;No ttyS2 */ # else # undef TTYS1_DEV /* UART0=ttyS0;No ttyS1;No ttyS2 */ # undef TTYS2_DEV /* No ttyS2 */ # endif # endif #endif /* HAVE_CONSOLE */ /**************************************************************************** * Inline Functions ****************************************************************************/ /**************************************************************************** * Name: up_serialin ****************************************************************************/ static inline uint32_t up_serialin(struct nuc_dev_s *priv, int offset) { return getreg32(priv->uartbase + offset); } /**************************************************************************** * Name: up_serialout ****************************************************************************/ static inline void up_serialout(struct nuc_dev_s *priv, int offset, uint32_t value) { putreg32(value, priv->uartbase + offset); } /**************************************************************************** * Name: up_disableuartint ****************************************************************************/ static inline void up_disableuartint(struct nuc_dev_s *priv, uint32_t *ier) { if (ier) { *ier = priv->ier & UART_IER_ALLIE; } priv->ier &= ~UART_IER_ALLIE; up_serialout(priv, NUC_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_restoreuartint ****************************************************************************/ static inline void up_restoreuartint(struct nuc_dev_s *priv, uint32_t ier) { priv->ier |= ier & UART_IER_ALLIE; up_serialout(priv, NUC_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: up_setup * * Description: * Configure the UART baud, bits, parity, fifos, etc. This method is * called the first time that the serial port is opened. * ****************************************************************************/ static int up_setup(struct uart_dev_s *dev) { #ifndef CONFIG_SUPPRESS_NUC_UART_CONFIG struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; uint32_t regval; /* Reset the TX FIFO */ regval = up_serialin(priv, NUC_UART_FCR_OFFSET regval |= UART_FCR_TFR up_serialout(priv, NUC_UART_FCR_OFFSET, regval); /* Reset the RX FIFO */ regval = up_serialin(priv, NUC_UART_FCR_OFFSET regval |= UART_FCR_RFR up_serialout(priv, NUC_UART_FCR_OFFSET, regval); /* Set Rx Trigger Level */ regval &= ~UART_FCR_FRITL_MASK; regval |= UART_FCR_FRITL_4; up_serialout(priv, NUC_UART_FCR_OFFSET, regval); /* Set Parity & Data bits and Stop bits */ regval = 0; #if NUC_CONSOLE_BITS == 5 regval |= UART_LCR_WLS_5; #elif NUC_CONSOLE_BITS == 6 regval |= UART_LCR_WLS_6; #elif NUC_CONSOLE_BITS == 7 regval |= UART_LCR_WLS_7; #elif NUC_CONSOLE_BITS == 8 regval |= UART_LCR_WLS_8; #else error "Unknown console UART data width" #endif #if NUC_CONSOLE_PARITY == 1 regval |= UART_LCR_PBE; #elif NUC_CONSOLE_PARITY == 2 regval |= (UART_LCR_PBE | UART_LCR_EPE); #endif #if NUC_CONSOLE_2STOP != 0 revgval |= UART_LCR_NSB; #endif up_serialout(priv, NUC_UART_LCR_OFFSET, regval); /* Set Time-Out values */ regval = UART_TOR_TOIC(40) | UART_TOR_DLY(0); up_serialout(priv, NUC_UART_TOR_OFFSET, regval); /* Set the baud */ nuc_setbaud(CONSOLE_BASE, CONSOLE_BAUD); /* Set up the IER */ priv->ier = up_serialin(priv, NUC_UART_IER_OFFSET); /* Enable Flow Control in the Modem Control Register */ /* Not implemented */ return OK; } /**************************************************************************** * Name: up_shutdown * * Description: * Disable the UART. This method is called when the serial port is closed * ****************************************************************************/ static void up_shutdown(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; up_disableuartint(priv, NULL); } /**************************************************************************** * Name: up_attach * * Description: * Configure the UART to operation in interrupt driven mode. This method is * called when the serial port is opened. Normally, this is just after the * the setup() method is called, however, the serial console may operate in * a non-interrupt driven mode during the boot phase. * * RX and TX interrupts are not enabled when by the attach method (unless the * hardware supports multiple levels of interrupt enabling). The RX and TX * interrupts are not enabled until the txint() and rxint() methods are called. * ****************************************************************************/ static int up_attach(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; int ret; /* Attach and enable the IRQ */ ret = irq_attach(priv->irq, up_interrupt); if (ret == OK) { /* Enable the interrupt (RX and TX interrupts are still disabled * in the UART */ up_enable_irq(priv->irq); } return ret; } /**************************************************************************** * Name: up_detach * * Description: * Detach UART interrupts. This method is called when the serial port is * closed normally just before the shutdown method is called. The exception is * the serial console which is never shutdown. * ****************************************************************************/ static void up_detach(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; up_disable_irq(priv->irq); irq_detach(priv->irq); } /**************************************************************************** * Name: up_interrupt * * Description: * This is the UART interrupt handler. It will be invoked when an * interrupt received on the 'irq' It should call uart_transmitchars or * uart_receivechar to perform the appropriate data transfers. The * interrupt handling logic must be able to map the 'irq' number into the * appropriate uart_dev_s structure in order to call these functions. * ****************************************************************************/ static int up_interrupt(int irq, void *context) { struct uart_dev_s *dev = NULL; struct nuc_dev_s *priv; uint32_t status; int passes; #ifdef CONFIG_NUC_UART0 if (g_uart0priv.irq == irq) { dev = &g_uart0port; } else #endif #ifdef CONFIG_NUC_UART1 if (g_uart1priv.irq == irq) { dev = &g_uart1port; } else #endif #ifdef CONFIG_NUC_UART2 if (g_uart2priv.irq == irq) { dev = &g_uart2port; } else #endif #ifdef CONFIG_NUC_UART3 if (g_uart3priv.irq == irq) { dev = &g_uart3port; } else #endif { PANIC(OSERR_INTERNAL); } priv = (struct nuc_dev_s*)dev->priv; /* Loop until there are no characters to be transferred or, * until we have been looping for a long time. */ for (passes = 0; passes < 256; passes++) { /* Get the current UART interrupt status */ status = up_serialin(priv, NUC_UART_ISR_OFFSET); /* Check if the RX FIFO is filled to the threshold value (OR if the RX * timeout occurred without the FIFO being filled) */ if ((status & UART_ISR_RDA_INT) != 0 || (status & UART_ISR_TOUT_INT) != 0) { uart_recvchars(dev); } /* Check if the transmit holding register is empty */ if ((status & UART_ISR_THRE_INT) != 0) { uart_xmitchars(dev); } /* Check for modem status */ if ((status & UART_ISR_MODEM_INT) != 0) { /* REVISIT: Do we clear this be reading the modem status register? */ volatile uint32_t status = up_serialin(priv, NUC_UART_MSR_OFFSET); vdbg("MSR: %08x\n", status); } /* Check for line status */ if ((status & UART_ISR_RLS_INT) != 0) { /* REVISIT: Do we clear this be reading the line status register? */ volatile uint32_t status = up_serialin(priv, NUC_UART_FSR_OFFSET); vdbg("LSR: %08x\n", status); } /* Check for buffer errors */ if ((status & UART_ISR_BUF_ERR_INT) != 0) { /* REVISIT: Do we clear this be reading the line status register? */ volatile uint32_t status = up_serialin(priv, NUC_UART_MSR_OFFSET); vdbg("MSR: %08x\n", status); } } return OK; } /**************************************************************************** * Name: up_ioctl * * Description: * All ioctl calls will be routed through this method * ****************************************************************************/ static int up_ioctl(struct file *filep, int cmd, unsigned long arg) { struct inode *inode = filep->f_inode; struct uart_dev_s *dev = inode->i_private; struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; int ret = OK; switch (cmd) { case TIOCSERGSTRUCT: { struct nuc_dev_s *user = (struct nuc_dev_s*)arg; if (!user) { ret = -EINVAL; } else { memcpy(user, dev, sizeof(struct nuc_dev_s)); } } break; case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */ case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */ ret = -ENOTTY; /* Not supported */ break; #ifdef CONFIG_SERIAL_TERMIOS case TCGETS: { struct termios *termiosp = (struct termios*)arg; if (!termiosp) { ret = -EINVAL; break; } /* TODO: Other termios fields are not yet returned. * Note that cfsetospeed is not necessary because we have * knowledge that only one speed is supported. * Both cfset(i|o)speed() translate to cfsetspeed. */ cfsetispeed(termiosp, priv->baud); } break; case TCSETS: { struct termios *termiosp = (struct termios*)arg; uint32_t lcr; /* Holds current values of line control register */ uint16_t dl; /* Divisor latch */ if (!termiosp) { ret = -EINVAL; break; } /* TODO: Handle other termios settings. * Note that only cfgetispeed is used because we have knowledge * that only one speed is supported. */ /* Get the c_speed field in the termios struct */ priv->baud = cfgetispeed(termiosp); /* Reset the baud */ nuc_setbaud(priv->base, priv->baud); } break; #endif default: ret = -ENOTTY; break; } return ret; } /**************************************************************************** * Name: up_receive * * Description: * Called (usually) from the interrupt level to receive one * character from the UART. Error bits associated with the * receipt are provided in the return 'status'. * ****************************************************************************/ static int up_receive(struct uart_dev_s *dev, uint32_t *status) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; uint32_t rbr; *status = up_serialin(priv, NUC_UART_FSR_OFFSET); rbr = up_serialin(priv, NUC_UART_RBR_OFFSET); return rbr; } /**************************************************************************** * Name: up_rxint * * Description: * Call to enable or disable RX interrupts * ****************************************************************************/ static void up_rxint(struct uart_dev_s *dev, bool enable) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; if (enable) { #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= (UART_IER_RDA_IEN | UART_IER_RLS_IEN | UART_IER_RTO_IEN | UART_IER_BUF_ERR_IEN UART_IER_TIME_OUT_EN); #endif } else { priv->ier &= ~(UART_IER_RDA_IEN | UART_IER_RLS_IEN | UART_IER_RTO_IEN); } up_serialout(priv, NUC_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_rxavailable * * Description: * Return true if the receive fifo is not empty * ****************************************************************************/ static bool up_rxavailable(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; return ((up_serialin(priv, NUC_UART_FSR_OFFSET) & UART_FSR_RX_EMPTY) != 0); } /**************************************************************************** * Name: up_send * * Description: * This method will send one byte on the UART * ****************************************************************************/ static void up_send(struct uart_dev_s *dev, int ch) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; up_serialout(priv, NUC_UART_THR_OFFSET, (uint32_t)ch); } /**************************************************************************** * Name: up_txint * * Description: * Call to enable or disable TX interrupts * ****************************************************************************/ static void up_txint(struct uart_dev_s *dev, bool enable) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; irqstate_t flags; flags = irqsave(); if (enable) { #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= (UART_IER_THRE_IEN | UART_IER_BUF_ERR_IEN); up_serialout(priv, NUC_UART_IER_OFFSET, priv->ier); /* Fake a TX interrupt here by just calling uart_xmitchars() with * interrupts disabled (note this may recurse). */ uart_xmitchars(dev); #endif } else { priv->ier &= ~UART_IER_THRE_IEN; up_serialout(priv, NUC_UART_IER_OFFSET, priv->ier); } irqrestore(flags); } /**************************************************************************** * Name: up_txready * * Description: * Return true if the tranmsit fifo is not full * ****************************************************************************/ static bool up_txready(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; uint32_t regval; int depth; regval = up_serialin(priv, NUC_UART_FSR_OFFSET); depth = (regval & UART_FSR_TX_POINTER_MASK) >> UART_FSR_TX_POINTER_SHIFT; return depth < priv->depth; } /**************************************************************************** * Name: up_txempty * * Description: * Return true if the transmit fifo is empty * ****************************************************************************/ static bool up_txempty(struct uart_dev_s *dev) { struct nuc_dev_s *priv = (struct nuc_dev_s*)dev->priv; return ((up_serialin(priv, NUC_UART_FSR_OFFSET) & UART_FSR_TE_FLAG) != 0); } /**************************************************************************** * Public Funtions ****************************************************************************/ /**************************************************************************** * Name: up_serialinit * * Description: * Performs the low level UART initialization early in debug so that the * serial console will be available during bootup. This must be called * before up_serialinit. * * NOTE: Configuration of the CONSOLE UART was performed by up_lowsetup() * very early in the boot sequence. * ****************************************************************************/ void up_earlyserialinit(void) { /* Configuration whichever UART is the console */ #ifdef CONSOLE_DEV CONSOLE_DEV.isconsole = true; up_setup(&CONSOLE_DEV); #endif } /**************************************************************************** * Name: up_serialinit * * Description: * Register serial console and serial ports. This assumes that * up_earlyserialinit was called previously. * ****************************************************************************/ void up_serialinit(void) { #ifdef CONSOLE_DEV (void)uart_register("/dev/console", &CONSOLE_DEV); #endif #ifdef TTYS0_DEV (void)uart_register("/dev/ttyS0", &TTYS0_DEV); #endif #ifdef TTYS1_DEV (void)uart_register("/dev/ttyS1", &TTYS1_DEV); #endif #ifdef TTYS2_DEV (void)uart_register("/dev/ttyS2", &TTYS2_DEV); #endif } /**************************************************************************** * Name: up_putc * * Description: * Provide priority, low-level access to support OS debug writes * ****************************************************************************/ int up_putc(int ch) { #ifdef HAVE_CONSOLE struct nuc_dev_s *priv = (struct nuc_dev_s*)CONSOLE_DEV.priv; uint32_t ier; up_disableuartint(priv, &ier); #endif /* Check for LF */ if (ch == '\n') { /* Add CR */ up_lowputc('\r'); } up_lowputc(ch); #ifdef HAVE_CONSOLE up_restoreuartint(priv, ier); #endif return ch; } #else /* USE_SERIALDRIVER */ /**************************************************************************** * Name: up_putc * * Description: * Provide priority, low-level access to support OS debug writes * ****************************************************************************/ int up_putc(int ch) { #ifdef HAVE_UART /* Check for LF */ if (ch == '\n') { /* Add CR */ up_lowputc('\r'); } up_lowputc(ch); #endif return ch; } #endif /* USE_SERIALDRIVER */