Port ADC, DAC, and PWM logic from the configs/zkit-arm-1769. From Max.

5 files changed, 502 insertions, 11 deletions

diff --git a/nuttx/configs/mbed/include/board.h b/nuttx/configs/mbed/include/board.h
index b490075da..2aebb114c 100644
--- a/nuttx/configs/mbed/include/board.h
+++ b/nuttx/configs/mbed/include/board.h
@@ -1,8 +1,7 @@
 /************************************************************************************
  * configs/mbed/include/board.h
- * include/arch/board/board.h
  *
- *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010, 2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -34,8 +33,8 @@
  *
  ************************************************************************************/
 
-#ifndef __ARCH_BOARD_BOARD_H
-#define __ARCH_BOARD_BOARD_H
+#ifndef __CONFIGS_MBED_INCLUDE_BOARD_H
+#define __CONFIGS_MBED_INCLUDE_BOARD_H
 
 /************************************************************************************
  * Included Files
@@ -60,7 +59,7 @@
 /* This is the clock setup we configure for:
  *
  *   SYSCLK = BOARD_OSCCLK_FREQUENCY = 12MHz  -> Select Main oscillator for source
- *   PLL0CLK = (2 * 20 * SYSCLK) / 1 = 480MHz -> PLL0 multipler=20, pre-divider=1
+ *   PLL0CLK = (2 * 20 * SYSCLK) / 1 = 480MHz -> PLL0 multiplier=20, pre-divider=1
  *   CCLCK = 480MHz / 6 = 80MHz               -> CCLK divider = 6
  */
 
@@ -123,6 +122,11 @@
 #define CONFIG_LPC17_FLASH         1
 #define BOARD_FLASHCFG_VALUE       0x0000303a
 
+/* Ethernet configuration */
+
+//#define ETH_MCFG_CLKSEL_DIV ETH_MCFG_CLKSEL_DIV44
+#define ETH_MCFG_CLKSEL_DIV ETH_MCFG_CLKSEL_DIV20
+
 /* LED definitions ******************************************************************/
 /* The MBED has 4 LEDs along the bottom of the board. Blue or off.
  * If CONFIG_ARCH_LEDS is defined, the LEDs will be controlled as follows for NuttX
@@ -163,6 +167,112 @@
 #  endif
 #endif
 
+/* Alternate pin selections *********************************************************/
+/* Pin Description                  Connector On Board       Base Board
+ * -------------------------------- --------- -------------- ---------------------
+ * P0[0]/RD1/TXD3/SDA1               J6-9     I2C E2PROM SDA TXD3/SDA1
+ * P0[1]/TD1/RXD3/SCL                J6-10                   RXD3/SCL1
+ * P0[2]/TXD0/AD0[7]                 J6-21
+ * P0[3]/RXD0/AD0[6]                 J6-22
+ * P0[4]/I2SRX-CLK/RD2/CAP2.0        J6-38                   CAN_RX2
+ * P0[5]/I2SRX-WS/TD2/CAP2.1         J6-39                   CAN_TX2
+ * P0[6]/I2SRX_SDA/SSEL1/MAT2[0]     J6-8                    SSEL1, OLED CS
+ * P0[7]/I2STX_CLK/SCK1/MAT2[1]      J6-7                    SCK1, OLED SCK
+ * P0[8]/I2STX_WS/MISO1/MAT2[2]      J6-6                    MISO1
+ * P0[9]/I2STX_SDA/MOSI1/MAT2[3]     J6-5                    MOSI1, OLED data in
+ * P0[10]                            J6-40                   TXD2/SDA2
+ * P0[11]                            J6-41                   RXD2/SCL2
+ * P0[15]/TXD1/SCK0/SCK              J6-13                   TXD1/SCK0
+ * P0[16]/RXD1/SSEL0/SSEL            J6-14                   RXD1/SSEL0
+ * P0[17]/CTS1/MISO0/MISO            J6-12                   MISO0
+ * P0[18]/DCD1/MOSI0/MOSI            J6-11                   MOSI0
+ * P0[19]/DSR1/SDA1                  PAD17                   N/A
+ * P0[20]/DTR1/SCL1                  PAD18    I2C E2PROM SCL N/A
+ * P0[21]/RI1/MCIPWR/RD1             J6-23
+ * P0[22]/RTS1/TD1                   J6-24    LED
+ * P0[23]/AD0[0]/I2SRX_CLK/CAP3[0]   J6-15                   AD0.0
+ * P0[24]/AD0[1]/I2SRX_WS/CAP3[1]    J6-16                   AD0.1
+ * P0[25]/AD0[2]/I2SRX_SDA/TXD3      J6-17                   AD0.2
+ * P0[26]/AD0[3]/AOUT/RXD3           J6-18                   AD0.3/AOUT / RGB LED
+ * P0[27]/SDA0/USB_SDA               J6-25
+ * P0[28]/SCL0                       J6-26
+ * P0[29]/USB_D+                     J6-37                   USB_D+
+ * P0[30]/USB_D-                     J6-36                   USB_D-
+ */
+
+#define GPIO_UART3_TXD     GPIO_UART3_TXD_1
+#define GPIO_I2C1_SDA      GPIO_I2C1_SDA_1
+#define GPIO_UART3_RXD     GPIO_UART3_RXD_1
+#define GPIO_I2C1_SCL      GPIO_I2C1_SCL_1
+#define GPIO_SSP1_SCK      GPIO_SSP1_SCK_1
+#define GPIO_UART2_TXD     GPIO_UART2_TXD_1
+#define GPIO_UART2_RXD     GPIO_UART2_RXD_1
+#define GPIO_UART1_TXD     GPIO_UART1_TXD_1
+#define GPIO_SSP0_SCK      GPIO_SSP0_SCK_1
+#define GPIO_UART1_RXD     GPIO_UART1_RXD_1
+#define GPIO_SSP0_SSEL     GPIO_SSP0_SSEL_1
+#define GPIO_SSP0_MISO     GPIO_SSP0_MISO_1
+#define GPIO_SSP0_MOSI     GPIO_SSP0_MOSI_1
+
+/* P1[0]/ENET-TXD0                   J6-34?  TXD0            TX-(Ethernet PHY)
+ * P1[1]/ENET_TXD1                   J6-35?  TXD1            TX+(Ethernet PHY)
+ * P1[4]/ENET_TX_EN                          TXEN            N/A
+ * P1[8]/ENET_CRS                            CRS_DV/MODE2    N/A
+ * P1[9]/ENET_RXD0                   J6-32?  RXD0/MODE0      RD-(Ethernet PHY)
+ * P1[10]/ENET_RXD1                  J6-33?  RXD1/MODE1      RD+(Ethernet PHY)
+ * P1[14]/ENET_RX_ER                         RXER/PHYAD0     N/A
+ * P1[15]/ENET_REF_CLK                       REFCLK          N/A
+ * P1[16]/ENET_MDC                           MDC             N/A
+ * P1[17]/ENET_MDIO                          MDIO            N/A
+ * P1[18]/USB_UP_LED/PWM1[1]/CAP1[0] PAD1                    N/A
+ * P1[19]/MC0A/USB_PPWR/N_CAP1.1     PAD2                    N/A
+ * P1[20]/MCFB0/PWM1.2/SCK0          PAD3                    N/A
+ * P1[21]/MCABORT/PWM1.3/SSEL0       PAD4                    N/A
+ * P1[22]/MC0B/USB-PWRD/MAT1.0       PAD5                    N/A
+ * P1[23]/MCFB1/PWM1.4/MISO0         PAD6                    N/A
+ * P1[24]/MCFB2/PWM1.5/MOSI0         PAD7                    N/A
+ * P1[25]/MC1A/MAT1.1                PAD8                    N/A
+ * P1[26]/MC1B/PWM1.6/CAP0.0         PAD9                    N/A
+ * P1[27]/CLKOUT/USB-OVRCR-N/CAP0.1  PAD10                   N/A
+ * P1[28]/MC2A/PCAP1.0/MAT0.0        PAD11                   N/A
+ * P1[29]/MC2B/PCAP1.1/MAT0.1        PAD12                   N/A
+ * P1[30]/VBUS/AD0[4]                J6-19                   AD0.4
+ * P1[31]/SCK1/AD0[5]                J6-20                   AD0.5
+ */
+
+#define GPIO_ENET_MDC      GPIO_ENET_MDC_1
+#define GPIO_ENET_MDIO     GPIO_ENET_MDIO_1
+
+/* P2[0]/PWM1.1/TXD1                 J6-42                   PWM1.1 / RGB LED / RS422 RX
+ * P2[1]/PWM1.2/RXD1                 J6-43                   PWM1.2 / OLED voltage / RGB LED / RS422 RX
+ * P2[2]/PWM1.3/CTS1/TRACEDATA[3]    J6-44                   PWM1.3
+ * P2[3]/PWM1.4/DCD1/TRACEDATA[2]    J6-45                   PWM1.4
+ * P2[4]/PWM1.5/DSR1/TRACEDATA[1]    J6-46                   PWM1.5
+ * P2[5]/PWM1[6]/DTR1/TRACEDATA[0]   J6-47                   PWM1.6
+ * P2[6]/PCAP1[0]/RI1/TRACECLK       J6-48
+ * P2[7]/RD2/RTS1                    J6-49                   OLED command/data
+ * P2[8]/TD2/TXD2                    J6-50
+ * P2[9]/USB_CONNECT/RXD2            PAD19   USB Pullup      N/A
+ * P2[10]/EINT0/NMI                  J6-51
+ * P2[11]/EINT1/I2STX_CLK            J6-52
+ * P2[12]/EINT2/I2STX_WS             J6-53
+ * P2[13]/EINT3/I2STX_SDA            J6-27
+ */
+
+#define GPIO_PWM1p1        GPIO_PWM1p1_2
+#define GPIO_PWM1p2        GPIO_PWM1p2_2
+#define GPIO_PWM1p3        GPIO_PWM1p3_2
+#define GPIO_PWM1p4        GPIO_PWM1p4_2
+#define GPIO_PWM1p5        GPIO_PWM1p5_2
+#define GPIO_PWM1p6        GPIO_PWM1p6_2
+
+/* P3[25]/MAT0.0/PWM1.2              PAD13                   N/A
+ * P3[26]/STCLK/MAT0.1/PWM1.3        PAD14                   N/A
+ *
+ * P4[28]/RX-MCLK/MAT2.0/TXD3        PAD15                   N/A
+ * P4[29]/TX-MCLK/MAT2.1/RXD3        PAD16                   N/A
+ */
+
 /************************************************************************************
  * Public Types
  ************************************************************************************/
@@ -176,7 +286,8 @@
 #undef EXTERN
 #if defined(__cplusplus)
 #define EXTERN extern "C"
-extern "C" {
+extern "C"
+{
 #else
 #define EXTERN extern
 #endif
@@ -189,12 +300,12 @@ extern "C" {
  *
  * Description:
  *   All LPC17xx architectures must provide the following entry point.  This entry point
- *   is called early in the intitialization -- after all memory has been configured
+ *   is called early in the initialization -- after all memory has been configured
  *   and mapped but before any devices have been initialized.
  *
  ************************************************************************************/
 
-EXTERN void lpc17_boardinitialize(void);
+void lpc17_boardinitialize(void);
 
 /************************************************************************************
  * Name: lpc17_led
@@ -205,7 +316,7 @@ EXTERN void lpc17_boardinitialize(void);
  ************************************************************************************/
 
 #ifdef CONFIG_ARCH_LEDS
-EXTERN void lpc17_led(int lednum, int state);
+void lpc17_led(int lednum, int state);
 #endif
 
 #undef EXTERN
@@ -214,4 +325,4 @@ EXTERN void lpc17_led(int lednum, int state);
 #endif
 
 #endif /* __ASSEMBLY__ */
-#endif  /* __ARCH_BOARD_BOARD_H */
+#endif  /* __CONFIGS_MBED_INCLUDE_BOARD_H */
diff --git a/nuttx/configs/mbed/src/Makefile b/nuttx/configs/mbed/src/Makefile
index 97a678114..63fcb075e 100644
--- a/nuttx/configs/mbed/src/Makefile
+++ b/nuttx/configs/mbed/src/Makefile
@@ -38,7 +38,8 @@
 CFLAGS		+= -I$(TOPDIR)/sched
 
 ASRCS		=
-CSRCS		= up_boot.c up_leds.c
+CSRCS		= up_boot.c up_leds.c up_adc.c up_dac.c up_pwm.c
+
 ifeq ($(CONFIG_NSH_ARCHINIT),y)
 CSRCS		+= up_nsh.c
 endif
diff --git a/nuttx/configs/mbed/src/up_adc.c b/nuttx/configs/mbed/src/up_adc.c
new file mode 100644
index 000000000..f48c0c383
--- /dev/null
+++ b/nuttx/configs/mbed/src/up_adc.c
@@ -0,0 +1,124 @@
+/************************************************************************************
+ * configs/mbed/src/up_adc.c
+ *
+ * Based on configs/zkit-arm-176/src/up-adc
+ *
+ *   Copyright (C) 2013 Zilogic Systems. All rights reserved.
+ *   Author: Kannan <code@nuttx.org>
+ *
+ * Based on configs/stm3220g-eval/src/up_adc.c
+ *
+ *   Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/analog/adc.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+
+#include "lpc17_adc.h"
+#include "mbed_internal.h"
+
+#ifdef CONFIG_ADC
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Data
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: adc_devinit
+ *
+ * Description:
+ *   All LPC17 architectures must provide the following interface to work with
+ *   examples/adc.
+ *
+ ************************************************************************************/
+
+int adc_devinit(void)
+{
+  static bool initialized = false;
+  struct adc_dev_s *adc;
+  int ret;
+
+  /* Check if we have already initialized */
+
+  if (!initialized)
+    {
+      /* Call lpc17_adcinitialize() to get an instance of the ADC interface */
+
+      adc = lpc17_adcinitialize();
+      if (adc == NULL)
+        {
+          adbg("ERROR: Failed to get ADC interface\n");
+          return -ENODEV;
+        }
+
+      /* Register the ADC driver at "/dev/adc0" */
+
+      ret = adc_register("/dev/adc0", adc);
+      if (ret < 0)
+        {
+          adbg("adc_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+  return OK;
+}
+
+#endif /* CONFIG_ADC */
diff --git a/nuttx/configs/mbed/src/up_dac.c b/nuttx/configs/mbed/src/up_dac.c
new file mode 100644
index 000000000..8875d9db8
--- /dev/null
+++ b/nuttx/configs/mbed/src/up_dac.c
@@ -0,0 +1,101 @@
+/************************************************************************************
+ * configs/mbed/src/up_dac.c
+ *
+ * Based on configs/zkit-arm-1769/src/up_dac.c
+ *
+ *   Copyright (C) 2013 Zilogic Systems. All rights reserved.
+ *   Author: Kannan <code@nuttx.org>
+ *
+ * Based on configs/stm3220g-eval/src/up_dac.c
+ *
+ *   Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/analog/dac.h>
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+
+#include "lpc17_dac.h"
+
+#ifdef CONFIG_DAC
+
+/************************************************************************************
+ * Name: dac_devinit
+ *
+ * Description:
+ *   All LPC17xx architectures must provide the following interface to work with
+ *   examples/diag.
+ *
+ ************************************************************************************/
+
+int dac_devinit(void)
+{
+  static bool initialized = false;
+  struct dac_dev_s *dac;
+  int ret;
+
+  if (!initialized)
+  {
+    /* Call lpc17_dacinitialize() to get an instance of the dac interface */
+
+    dac = lpc17_dacinitialize();
+    if (dac == NULL)
+      {
+        adbg("ERROR: Failed to get dac interface\n");
+        return -ENODEV;
+      }
+
+    ret = dac_register("/dev/dac0", dac);
+    if (ret < 0)
+      {
+        adbg("dac_register failed: %d\n", ret);
+        return ret;
+      }
+
+    initialized = true;
+  }
+
+  return OK;
+}
+
+#endif /* CONFIG_DAC */
diff --git a/nuttx/configs/mbed/src/up_pwm.c b/nuttx/configs/mbed/src/up_pwm.c
new file mode 100644
index 000000000..569418052
--- /dev/null
+++ b/nuttx/configs/mbed/src/up_pwm.c
@@ -0,0 +1,154 @@
+/************************************************************************************
+ * configs/mbed/up_pwm.c
+ *
+ * Based on onfigs/lpcexpresso-lpc1768/up_pwm.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/pwm.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "lpc17_pwm.h"
+#include "lpc17_timer.h"
+#include "mbed_internal.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+#ifdef CONFIG_PWM
+
+FAR struct pwm_lowerhalf_s *lpc17_pwminitialize(int timer);
+FAR struct pwm_lowerhalf_s *lpc17_mcpwminitialize(int timer);
+FAR struct pwm_lowerhalf_s *lpc17_timerinitialize(int timer);
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: pwm_devinit
+ *
+ * Description:
+ *   All LPC17 architectures must provide the following interface to work with
+ *   examples/pwm.
+ *
+ ************************************************************************************/
+
+int pwm_devinit(void)
+{
+  static bool initialized = false;
+  struct pwm_lowerhalf_s *pwm;
+  struct pwm_lowerhalf_s *mcpwm;
+  struct pwm_lowerhalf_s *timer;
+  int ret;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Call lpc17_pwminitialize() to get an instance of the PWM interface */
+
+      pwm = lpc17_pwminitialize(0);
+      if (!pwm)
+        {
+          adbg("Failed to get the LPC17XX PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/pwm0" */
+
+      ret = pwm_register("/dev/pwm0", pwm);
+      if (ret < 0)
+        {
+          adbg("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      mcpwm = lpc17_mcpwminitialize(0);
+      if (!mcpwm)
+        {
+          adbg("Failed to get the LPC17XX MOTOR PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the MOTOR CONTROL PWM driver at "/dev/mcpwm0" */
+
+      ret = pwm_register("/dev/mcpwm0", mcpwm);
+      if (ret < 0)
+        {
+          adbg("mcpwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      timer = lpc17_timerinitialize(0);
+      if (!timer)
+        {
+          adbg("Failed to get the LPC17XX TIMER lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/timer0" */
+
+      ret = pwm_register("/dev/timer0", timer);
+      if (ret < 0)
+        {
+          adbg("timer_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+  return OK;
+}
+
+#endif /* CONFIG_PWM */