Add CAN, PWM, ADC and UART1/2/3 support to the LPC176x BSP.

This patch adds support for the following devices to the LPC176x BSP:

* CAN
* PWM
* ADC

It also adds the probe routines for UART1/2/3 to the console_device_table in console-config.c, and enables UART1 in configure.ac.

1 files changed, 210 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/arm/lpc176x/pwmout/pwmout.c b/c/src/lib/libbsp/arm/lpc176x/pwmout/pwmout.c
new file mode 100755
index 0000000000..a3683869a5
--- /dev/null
+++ b/c/src/lib/libbsp/arm/lpc176x/pwmout/pwmout.c
@@ -0,0 +1,210 @@
+/**
+ * @file pwmout.c
+ *
+ * @ingroup lpc176x
+ *
+ * @brief PWM-Out controller for the mbed lpc1768 board.
+ */
+
+/*
+ * Copyright (c) 2014 Taller Technologies.
+ *
+ * @author  Diaz Marcos (marcos.diaz@tallertechnologies.com)
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#include <rtems/status-checks.h>
+#include <bsp/pwmout.h>
+#include <bsp/pwmout-defs.h>
+
+/**
+ * @brief The low level device.
+ */
+static lpc176x_pwm_device *const pwm_device = PWM1_BASE_ADDR;
+
+/**
+ * @brief The possible output pins for each PWM output.
+ */
+static const lpc176x_pwm_pin pwm_pins[ PWM_OUTPUT_NUMBER ][ PWM_NUMBER_OF_PINS
+] =
+{
+  { { 50u, LPC176X_PIN_FUNCTION_10 }, { 64u, LPC176X_PIN_FUNCTION_01 } },
+  { { 52u, LPC176X_PIN_FUNCTION_10 }, { 65u, LPC176X_PIN_FUNCTION_01 } },
+  { { 53u, LPC176X_PIN_FUNCTION_10 }, { 66u, LPC176X_PIN_FUNCTION_01 } },
+  { { 55u, LPC176X_PIN_FUNCTION_10 }, { 67u, LPC176X_PIN_FUNCTION_01 } },
+  { { 56u, LPC176X_PIN_FUNCTION_10 }, { 68u, LPC176X_PIN_FUNCTION_01 } },
+  { { 58u, LPC176X_PIN_FUNCTION_10 }, { 69u, LPC176X_PIN_FUNCTION_01 } },
+};
+
+/**
+ * @brief The pointers to the low level match registers for each PWM output.
+ */
+static volatile uint32_t *const pwm_match[ PWM_OUTPUT_NUMBER ] = {
+  &PWM1MR1,
+  &PWM1MR2,
+  &PWM1MR3,
+  &PWM1MR4,
+  &PWM1MR5,
+  &PWM1MR6
+};
+
+/**
+ * @brief Checks if a pin number is valid for the given PWM,
+ *  and sets the corresponding pin function for that pin.
+ *
+ * @param pin_number The pin number to search.
+ * @param pwm In which PWM search for the pin number.
+ * @param pin_function If the pin number is found, here we return
+ *  the pin function for that pin number.
+ * @return True if found, false otherwise.
+ */
+static inline bool is_found_in_this_pwm(
+  const lpc176x_pin_number       pin_number,
+  const lpc176x_pwm_number    pwm,
+  lpc176x_pin_function *const pin_function
+)
+{
+  lpc176x_pwm_pin_number pnumber = PWM_FIRST_PIN;
+  bool                   found = false;
+
+  while (!found && ( pnumber < PWM_NUMBER_OF_PINS ))
+  {
+    if ( pwm_pins[ pwm ][ pnumber ].pin_number == pin_number ) {
+      found = true;
+      *pin_function = pwm_pins[ pwm ][ pnumber ].pin_function;
+    }/*else implies that the pin number was not found. Keep looking.*/
+    ++pnumber;
+  }
+  return found;
+}
+
+/**
+ * @brief Checks if a pin number is valid for any PWM,
+ *  and sets the corresponding pin function for that pin.
+ *
+ * @param pin_number The pin number to search.
+ * @param pwm If is found here we return in which PWM was found.
+ * @param pin_function If the pin number is found the pin function
+ *  for this pin number one will be returned.
+ * @return True if found, false otherwise.
+ */
+static bool is_valid_pin_number(
+  const lpc176x_pin_number       pin_number,
+  lpc176x_pwm_number *const   pwm,
+  lpc176x_pin_function *const pin_function
+)
+{
+  bool               found = false;
+  lpc176x_pwm_number pwm_local = PWMO_1;
+  while(!found && ( pwm_local < PWM_OUTPUT_NUMBER ))
+  {
+    if ( is_found_in_this_pwm( pin_number, pwm_local, pin_function ) ) {
+      *pwm = pwm_local;
+      found = true;
+    } /*else implies that the pin number was not found. Keep looking.*/
+    ++pwm_local;
+  }
+
+  return found;
+}
+
+/**
+ * @brief Sets the period for the given PWM.
+ *
+ * @param pwm The PWM output in which the period will be set.
+ * @param period The period to set.
+ */
+static void set_period(
+  const lpc176x_pwm_number   pwm,
+  const lpc176x_microseconds period
+)
+{
+  pwm_device->TCR = PWM_TCR_RESET;
+  pwm_device->MR0 = period * PWM_PRESCALER_USECOND;
+  pwm_device->LER |= PWM_LER_LATCH_MATCH_0;
+  pwm_device->TCR = PWM_TCR_PWM | PWM_TCR_ENABLE;
+}
+
+/**
+ * @brief Sets the pulsewidth for the given PWM.
+ *
+ * @param pwm The PWM output in which the pulsewidth will be set.
+ * @param pwidth The pulse width to set.
+ */
+static void set_pulsewidth(
+  const lpc176x_pwm_number pwm,
+  lpc176x_microseconds     pwidth
+)
+{
+  pwidth *= PWM_PRESCALER_USECOND;
+
+  if ( pwm_device->MR0 == pwidth ) {
+    ++pwidth;
+  } /* Not the same as the period, do nothing.*/
+
+  *( pwm_match[ pwm ] ) = pwidth;
+  pwm_device->LER |= PWM_LER_LATCH( pwm );
+}
+
+rtems_status_code pwm_init( const lpc176x_pin_number pin_number )
+{
+  rtems_status_code    sc = RTEMS_INVALID_NUMBER;
+  lpc176x_pin_function pin_function;
+  lpc176x_pwm_number   pwm;
+
+  if ( is_valid_pin_number( pin_number, &pwm, &pin_function ) ) {
+    sc = lpc176x_module_enable( LPC176X_MODULE_PWM_1,
+      LPC176X_MODULE_PCLK_DEFAULT );
+    RTEMS_CHECK_SC( sc, "enable pwm module" );
+
+    pwm_device->PR = 0;
+    pwm_device->MCR = PWM_MCR_RESET_ON_MATCH0;
+    pwm_device->PCR |= PWM_PCR_ENABLE_PWM( pwm );
+
+    set_period( pwm, PWM_DEFAULT_PERIOD );
+    set_pulsewidth( pwm, PWM_DEFAULT_PULSEWIDTH );
+
+    lpc176x_pin_select( pin_number, pin_function );
+  } /* else implies that the pin number is not valid.
+     So, a RTEMS_INVALID_NUMBER will be returned.*/
+
+  return sc;
+}
+
+rtems_status_code pwm_period(
+  const lpc176x_pin_number    pin_number,
+  const lpc176x_microseconds period
+)
+{
+  rtems_status_code    sc = RTEMS_INVALID_NUMBER;
+  lpc176x_pin_function pin_function;
+  lpc176x_pwm_number   pwm;
+
+  if ( is_valid_pin_number( pin_number, &pwm, &pin_function ) ) {
+    sc = RTEMS_SUCCESSFUL;
+    set_period( pwm, period );
+  } /* else implies that the pin number is not valid.
+     So, a RTEMS_INVALID_NUMBER will be returned.*/
+
+  return sc;
+}
+
+rtems_status_code pwm_pulsewidth(
+  const lpc176x_pin_number    pin_number,
+  const lpc176x_microseconds pwidth
+)
+{
+  rtems_status_code    sc = RTEMS_INVALID_NUMBER;
+  lpc176x_pin_function pin_function;
+  lpc176x_pwm_number   pwm;
+
+  if ( is_valid_pin_number( pin_number, &pwm, &pin_function ) ) {
+    sc = RTEMS_SUCCESSFUL;
+    set_pulsewidth( pwm, pwidth );
+  } /* Else wrong pin_number return RTEMS_INVALID_NUMBER*/
+
+  return sc;
+}