diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-28 22:07:44 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-28 22:07:44 +0000 |
commit | eb5368880d12d72548b29773e26e67452ca0133f (patch) | |
tree | ac3d6ba1be3f46425b01af5b4fac4fa7c46837fe /nuttx/arch/arm/src/lpc313x | |
parent | c4cf734f03d84c94fe7494d3f83a092ea8512151 (diff) | |
download | px4-nuttx-eb5368880d12d72548b29773e26e67452ca0133f.tar.gz px4-nuttx-eb5368880d12d72548b29773e26e67452ca0133f.tar.bz2 px4-nuttx-eb5368880d12d72548b29773e26e67452ca0133f.zip |
lpc313x uart driver code complete
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2446 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lpc313x')
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/Make.defs | 3 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/lpc313x_lowputc.c | 325 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/lpc313x_memorymap.h | 1 | ||||
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/lpc313x_serial.c | 108 |
4 files changed, 375 insertions, 62 deletions
diff --git a/nuttx/arch/arm/src/lpc313x/Make.defs b/nuttx/arch/arm/src/lpc313x/Make.defs index 012eb7c4f..eea5dd3bb 100755 --- a/nuttx/arch/arm/src/lpc313x/Make.defs +++ b/nuttx/arch/arm/src/lpc313x/Make.defs @@ -50,4 +50,5 @@ CGU_CSRCS = lpc313x_clkdomain.c lpc313x_clkfreq.c lpc313x_esrndx.c \ lpc313x_fdcndx.c lpc313x_softreset.c CHIP_ASRCS = $(CGU_ASRCS) -CHIP_CSRCS = lpc313x_allocateheap.c lpc313x_irq.c lpc313x_timerisr.c $(CGU_CSRCS) +CHIP_CSRCS = lpc313x_allocateheap.c lpc313x_irq.c lpc313x_lowputc.c \ + lpc313x_serial.c lpc313x_timerisr.c $(CGU_CSRCS) diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_lowputc.c b/nuttx/arch/arm/src/lpc313x/lpc313x_lowputc.c new file mode 100755 index 000000000..9e0432baa --- /dev/null +++ b/nuttx/arch/arm/src/lpc313x/lpc313x_lowputc.c @@ -0,0 +1,325 @@ +/**************************************************************************** + * arch/arm/src/lpc313x/lpc313x_lowputc.c + * + * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 <nuttx/config.h> + +#include <sys/types.h> +#include <stdint.h> +#include <debug.h> + +#include <nuttx/arch.h> + +#include "up_arch.h" +#include "up_internal.h" + +#include "lpc313x_cgudrvr.h" +#include "lpc313x_uart.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: up_waittxready + ****************************************************************************/ + +static inline void up_waittxready(void) +{ + int tmp; + + /* Limit how long we will wait for the TX available condition */ + + for (tmp = 1000 ; tmp > 0 ; tmp--) + { + /* Check if the tranmitter holding register (THR) is empty */ + + if ((getreg32(LPC313X_UART_LSR) & UART_LSR_THRE) != 0) + { + /* The THR is empty, return */ + + break; + } + } +} + +/**************************************************************************** + * Name: up_configbaud + ****************************************************************************/ + +#ifndef CONFIG_USE_EARLYSERIALINIT +static inline void up_configbaud(void) +{ + /* In a buckled-up, embedded system, there is no reason to constantly + * calculate the following. The calculation can be skipped if the + * MULVAL, DIVADDVAL, and DIVISOR values are provided in the configuration + * file. + */ + +#ifndef CONFIG_LPC313X_UART_MULVAL + uint32_t qtrclk; + uint32_t regval; + + /* Test values calculated for every multiplier/divisor combination */ + + uint32_t tdiv; + uint32_t terr; + int tmulval; + int tdivaddval; + + /* Optimal multiplier/divider values */ + + uint32_t div = 0; + uint32_t err = 100000; + int mulval = 1; + int divaddval = 0; + + /* Baud is generated using FDR and DLL-DLM registers + * + * baud = clock * (mulval/(mulval+divaddval) / (16 * div) + * + * Or + * + * div = (clock/16) * (mulval/(mulval+divaddval) / baud + * + * Where mulval = Fractional divider multiplier + * divaddval = Fractional divider pre-scale div + * div = DLL-DLM divisor + */ + + /* Get UART block clock divided by 16 */ + + qtrclk = lpc313x_clkfreq(CLKID_UARTUCLK, DOMAINID_UART) >> 4; + + /* Try every valid multiplier, tmulval (or until a perfect + * match is found). + */ + + for (tmulval = 1 ; tmulval <= 15 && err > 0; tmulval++) + { + /* Try every valid pre-scale div, tdivaddval (or until a perfect + * match is found). + */ + + for (tdivaddval = 0 ; tdivaddval <= 15 && err > 0; tdivaddval++) + { + /* Calculate the divisor with these fractional divider settings */ + + uint32_t tmp = (tmulval * qtrclk) / ((tmulval + tdivaddval)); + tdiv = (tmp + (CONFIG_UART_BAUD>>1)) / CONFIG_UART_BAUD; + + /* Check if this candidate divisor is within a valid range */ + + if (tdiv > 2 && tdiv < 0x10000) + { + /* Calculate the actual baud and the error */ + + uint32_t actualbaud = tmp / tdiv; + + if (actualbaud <= CONFIG_UART_BAUD) + { + terr = CONFIG_UART_BAUD - actualbaud; + } + else + { + terr = actualbaud - CONFIG_UART_BAUD; + } + + /* Is this the smallest error we have encountered? */ + + if (terr < err) + { + /* Yes, save these settings as the new, candidate optimal settings */ + + mulval = tmulval ; + divaddval = tdivaddval; + div = tdiv; + err = terr; + } + } + } + } + + /* Set the Divisor Latch Access Bit (DLAB) to enable DLL/DLM access */ + + regval = getreg32(LPC313X_UART_LCR); + regval |= UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); + + /* Configure the MS and LS DLAB registers */ + + putreg32(div & UART_DLL_MASK, LPC313X_UART_DLL); + putreg32((div >> 8) & UART_DLL_MASK, LPC313X_UART_DLM); + + regval &= ~UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); + + /* Configure the Fractional Divider Register (FDR) */ + + putreg32((mulval << UART_FDR_MULVAL_SHIFT) | + (divaddval << UART_FDR_DIVADDVAL_SHIFT), + LPC313X_UART_FDR); +#else + /* Set the Divisor Latch Access Bit (DLAB) to enable DLL/DLM access */ + + regval = getreg32(LPC313X_UART_LCR); + regval |= UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); + + /* Configure the MS and LS DLAB registers */ + + putreg32(CONFIG_LPC313X_UART_DIVISOR & UART_DLL_MASK, LPC313X_UART_DLL); + putreg32((CONFIG_LPC313X_UART_DIVISOR >> 8) & UART_DLL_MASK, LPC313X_UART_DLM); + + regval &= ~UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); + + /* Configure the Fractional Divider Register (FDR) */ + + putreg32((CONFIG_LPC313X_UART_MULVAL << UART_FDR_MULVAL_SHIFT) | + (CONFIG_LPC313X_UART_DIVADDVAL << UART_FDR_DIVADDVAL_SHIFT), + LPC313X_UART_FDR); +#endif +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ +/**************************************************************************** + * Name: up_lowsetup + * + * Description: + * Configure the UART baud, bits, parity, fifos, etc. This method is called + * the first time that the serial port is opened. + * + ****************************************************************************/ + +void up_lowsetup(void) +{ +#ifndef CONFIG_SUPPRESS_LPC313X_UART_CONFIG + uint32_t regval; + + /* Enable UART system clock */ + + lpc313x_enableclock(CLKID_UARTAPBCLK); + lpc313x_enableclock(CLKID_UARTUCLK); + + /* Clear fifos */ + + putreg32((UART_FCR_RXFIFORST|UART_FCR_TXFIFORST), LPC313X_UART_FCR); + + /* Set trigger */ + + putreg32((UART_FCR_FIFOENABLE|UART_FCR_RXTRIGLEVEL_16), LPC313X_UART_FCR); + + /* Set up the LCR */ + + regval = 0; + +#if CONFIG_UART_BITS == 5 + regval |= UART_LCR_WDLENSEL_5BITS; +#elif CONFIG_UART_BITS == 6 + regval |= UART_LCR_WDLENSEL_6BITS; +#elif CONFIG_UART_BITS == 7 + regval |= UART_LCR_WDLENSEL_7BITS; +#else + regval |= UART_LCR_WDLENSEL_8BITS; +#endif + +#if CONFIG_UART_2STOP > 0 + regval |= UART_LCR_NSTOPBITS; +#endif + +#if CONFIG_UART_PARITY == 1 + regval |= UART_LCR_PAREN; +#elif CONFIG_UART_PARITY == 2 + regval |= (UART_LCR_PAREVEN|UART_LCR_PAREN); +#endif + putreg32(regval, LPC313X_UART_LCR); + + /* Set the BAUD divisor */ + + up_configbaud(); + + /* Configure the FIFOs */ + + putreg32((UART_FCR_RXTRIGLEVEL_16|UART_FCR_TXFIFORST| + UART_FCR_RXFIFORST|UART_FCR_FIFOENABLE), + LPC313X_UART_FCR); + + /* The NuttX serial driver waits for the first THRE interrrupt before + * sending serial data... However, it appears that the lpc313x hardware + * does not generate that interrupt until a transition from not-empty + * to empty. So, the current kludge here is to send one NULL at + * startup to kick things off. + */ + + putreg32('\0', LPC313X_UART_THR); +#endif +} +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: up_lowputc + * + * Description: + * Provide priority, low-level access to support OS debug writes + * + ****************************************************************************/ + +void up_lowputc(char ch) +{ + up_waittxready(); + putreg32((uint32_t)ch, LPC313X_UART_THR); +} diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_memorymap.h b/nuttx/arch/arm/src/lpc313x/lpc313x_memorymap.h index 848a99445..18839bf01 100755 --- a/nuttx/arch/arm/src/lpc313x/lpc313x_memorymap.h +++ b/nuttx/arch/arm/src/lpc313x/lpc313x_memorymap.h @@ -142,6 +142,7 @@ */ /* For now, just to get through the compilation */ + #define NUTTX_START_VADDR 0x00000000 /************************************************************************************ diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_serial.c b/nuttx/arch/arm/src/lpc313x/lpc313x_serial.c index 3a3b539cb..51dcb8e9a 100755 --- a/nuttx/arch/arm/src/lpc313x/lpc313x_serial.c +++ b/nuttx/arch/arm/src/lpc313x/lpc313x_serial.c @@ -57,7 +57,7 @@ #include "os_internal.h" #include "up_internal.h" -#include "lpc313x_cgudriver.h" +#include "lpc313x_cgudrvr.h" #include "lpc313x_uart.h" #ifdef CONFIG_USE_SERIALDRIVER @@ -79,6 +79,12 @@ struct up_dev_s * Private Function Prototypes ****************************************************************************/ +static inline void up_disableuartint(struct up_dev_s *priv, uint8_t *ier); +static inline void up_restoreuartint(struct up_dev_s *priv, uint8_t ier); +static inline void up_enablebreaks(void); +static inline void up_disablebreaks(void); +static inline void up_configbaud(void); + 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); @@ -167,43 +173,24 @@ static inline void up_restoreuartint(struct up_dev_s *priv, uint8_t ier) } /**************************************************************************** - * Name: up_waittxready + * Name: up_enablebreaks ****************************************************************************/ -static inline void up_waittxready(struct up_dev_s *priv) +static inline void up_enablebreaks(void) { - int tmp; - - /* Limit how long we will wait for the TX available condition */ - - for (tmp = 1000 ; tmp > 0 ; tmp--) - { - /* Check if the tranmitter holding register (THR) is empty */ - - if ((getreg32(LPC313X_UART_LSR) & UART_LSR_THRE) != 0) - { - /* The THR is empty, return */ - - break; - } - } + uint32_t lcr = getreg32(LPC313X_UART_LCR); + lcr |= UART_LCR_BRKCTRL; + putreg32(lcr, LPC313X_UART_LCR); } /**************************************************************************** - * Name: up_enablebreaks + * Name: up_disablebreaks ****************************************************************************/ -static inline void up_enablebreaks(struct up_dev_s *priv, bool enable) +static inline void up_disablebreaks(void) { - uint32_t_t lcr = getreg32(LPC313X_UART_LCR); - if (enable) - { - lcr |= UART_LCR_BRKCTRL; - } - else - { - lcr &= ~UART_LCR_BRKCTRL; - } + uint32_t lcr = getreg32(LPC313X_UART_LCR); + lcr &= ~UART_LCR_BRKCTRL; putreg32(lcr, LPC313X_UART_LCR); } @@ -305,43 +292,43 @@ static inline void up_configbaud(void) /* Set the Divisor Latch Access Bit (DLAB) to enable DLL/DLM access */ - regval = getreg32(LPV313X_UART_LCR); - regval |= UART_LCR_DLAB - putreg32(regval, LPV313X_UART_LCR); + regval = getreg32(LPC313X_UART_LCR); + regval |= UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); /* Configure the MS and LS DLAB registers */ putreg32(div & UART_DLL_MASK, LPC313X_UART_DLL); - putreg32((div >> 8) & UART_DLL_MASK, LPC313X_UART_DLM);\ + putreg32((div >> 8) & UART_DLL_MASK, LPC313X_UART_DLM); - regval &~= UART_LCR_DLAB - putreg32(regval, LPV313X_UART_LCR); + regval &= ~UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); /* Configure the Fractional Divider Register (FDR) */ putreg32((mulval << UART_FDR_MULVAL_SHIFT) | (divaddval << UART_FDR_DIVADDVAL_SHIFT), - LPC313X_UART_FRD); + LPC313X_UART_FDR); #else /* Set the Divisor Latch Access Bit (DLAB) to enable DLL/DLM access */ - regval = getreg32(LPV313X_UART_LCR); - regval |= UART_LCR_DLAB - putreg32(regval, LPV313X_UART_LCR); + regval = getreg32(LPC313X_UART_LCR); + regval |= UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); /* Configure the MS and LS DLAB registers */ putreg32(CONFIG_LPC313X_UART_DIVISOR & UART_DLL_MASK, LPC313X_UART_DLL); - putreg32((CONFIG_LPC313X_UART_DIVISOR >> 8) & UART_DLL_MASK, LPC313X_UART_DLM);\ + putreg32((CONFIG_LPC313X_UART_DIVISOR >> 8) & UART_DLL_MASK, LPC313X_UART_DLM); - regval &~= UART_LCR_DLAB - putreg32(regval, LPV313X_UART_LCR); + regval &= ~UART_LCR_DLAB; + putreg32(regval, LPC313X_UART_LCR); /* Configure the Fractional Divider Register (FDR) */ putreg32((CONFIG_LPC313X_UART_MULVAL << UART_FDR_MULVAL_SHIFT) | (CONFIG_LPC313X_UART_DIVADDVAL << UART_FDR_DIVADDVAL_SHIFT), - LPC313X_UART_FRD); + LPC313X_UART_FDR); #endif } @@ -392,10 +379,10 @@ static int up_setup(struct uart_dev_s *dev) #if CONFIG_UART_PARITY == 1 regval |= UART_LCR_PAREN; -#elif CONFIG_UART_PARITY == 2) +#elif CONFIG_UART_PARITY == 2 regval |= (UART_LCR_PAREVEN|UART_LCR_PAREN); #endif - putreg32(regval, LPV313X_UART_LCR); + putreg32(regval, LPC313X_UART_LCR); /* Set the BAUD divisor */ @@ -403,7 +390,7 @@ static int up_setup(struct uart_dev_s *dev) /* Configure the FIFOs */ - putreg32((UART_FCR_RXTRIGLEVEL_16|UART_FCR_TXFIFORST|\ + putreg32((UART_FCR_RXTRIGLEVEL_16|UART_FCR_TXFIFORST| UART_FCR_RXFIFORST|UART_FCR_FIFOENABLE), LPC313X_UART_FCR); @@ -496,7 +483,6 @@ static void up_detach(struct uart_dev_s *dev) static int up_interrupt(int irq, void *context) { struct uart_dev_s *dev = &g_uartport; - struct up_dev_s *priv = &g_uartpriv; uint8_t status; int passes; @@ -592,7 +578,6 @@ 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 up_dev_s *priv = (struct up_dev_s*)dev->priv; int ret = OK; switch (cmd) @@ -614,7 +599,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg) case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */ { irqstate_t flags = irqsave(); - up_enablebreaks(priv, true); + up_enablebreaks(); irqrestore(flags); } break; @@ -623,7 +608,7 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg) { irqstate_t flags; flags = irqsave(); - up_enablebreaks(priv, false); + up_disablebreaks(); irqrestore(flags); } break; @@ -690,7 +675,6 @@ static void up_rxint(struct uart_dev_s *dev, bool enable) static bool up_rxavailable(struct uart_dev_s *dev) { - struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((getreg32(LPC313X_UART_LSR) & UART_LSR_RDR) != 0); } @@ -704,7 +688,6 @@ static bool up_rxavailable(struct uart_dev_s *dev) static void up_send(struct uart_dev_s *dev, int ch) { - struct up_dev_s *priv = (struct up_dev_s*)dev->priv; putreg32((uint32_t)ch, LPC313X_UART_THR); } @@ -742,7 +725,6 @@ static void up_txint(struct uart_dev_s *dev, bool enable) static bool up_txready(struct uart_dev_s *dev) { - struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((getreg32(LPC313X_UART_LSR) & UART_LSR_THRE) != 0); } @@ -756,12 +738,11 @@ static bool up_txready(struct uart_dev_s *dev) static bool up_txempty(struct uart_dev_s *dev) { - struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((getreg32(LPC313X_UART_LSR) & UART_LSR_TEMT) != 0); } /**************************************************************************** - * Public Funtions + * Public Functions ****************************************************************************/ /**************************************************************************** @@ -820,12 +801,14 @@ void up_serialinit(void) int up_putc(int ch) { - struct up_dev_s *priv = g_uartpriv; + struct up_dev_s *priv = &g_uartpriv; uint8_t ier; + /* Keep UART interrupts disabled so that we do not interfere with the + * serial driver. + */ + up_disableuartint(priv, &ier); - up_waittxready(priv); - putreg32((uint32_t)ch, LPC313X_UART_THR); /* Check for LF */ @@ -833,11 +816,12 @@ int up_putc(int ch) { /* Add CR */ - up_waittxready(priv); - putreg32('\r', LPC313X_UART_THR); + up_lowputc('\r'); } - up_waittxready(priv); + /* Output the character */ + + up_lowputc(ch); up_restoreuartint(priv, ier); return ch; } @@ -863,6 +847,8 @@ int up_putc(int ch) up_lowputc('\r'); } + /* Output the character */ + up_lowputc(ch); return ch; } |