1 files changed, 138 insertions, 0 deletions
diff --git a/os/hal/ports/TIVA/TM4C123x/hal_lld.c b/os/hal/ports/TIVA/TM4C123x/hal_lld.c
new file mode 100644
index 0000000..7a6046d
--- /dev/null
+++ b/os/hal/ports/TIVA/TM4C123x/hal_lld.c
@@ -0,0 +1,138 @@
+/*
+    Copyright (C) 2014 Marco Veeneman
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    TIVA/TM4C123x/hal_lld.c
+ * @brief   TM4C123x HAL Driver subsystem low level driver source.
+ *
+ * @addtogroup HAL
+ * @{
+ */
+
+#include "hal.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level HAL driver initialization.
+ *
+ * @notapi
+ */
+void hal_lld_init(void)
+{
+}
+
+/**
+ * @brief   TM4C123x clocks and PLL initialization.
+ * @note    All the involved constants come from the file @p board.h and 
+ *          @p mcuconf.h.
+ * @note    This function should be invoked just after the system reset.
+ *
+ * @special
+ */
+void tiva_clock_init(void)
+{
+  uint32_t rcc, rcc2, i;
+
+  /* 1. Bypass the PLL and system clock divider by setting the BYPASS bit and
+   * clearing the USESYSDIV bit in the RCC register, thereby configuring the
+   * microcontroller to run off a "raw" clock source and allowing for the new
+   * PLL configuration to be validated before switching the system clock to the
+   * PLL. */
+  /* read */
+
+  rcc = SYSCTL->RCC;
+  rcc2 = SYSCTL->RCC2;
+  
+  /* modify */
+  rcc |= TIVA_RCC_BYPASS;
+  rcc &= ~TIVA_RCC_USESYSDIV;
+  rcc2 |= TIVA_RCC2_BYPASS2 | TIVA_RCC2_USERCC2;
+  
+  /* write */
+  SYSCTL->RCC = rcc;
+  SYSCTL->RCC2 = rcc2;
+
+  /* 2 Select the crystal value (XTAL) and oscillator source (OSCSRC), and
+   * clear the PWRDN bit in RCC and RCC2. Setting the XTAL field automatically
+   * pulls valid PLL configuration data for the appropriate crystal, and
+   * clearing the PWRDN bit powers and enables the PLL and its output. */
+  /* modify */
+  rcc &= ~(TIVA_RCC_OSCSRC_MASK | TIVA_RCC_XTAL_MASK | TIVA_RCC_PWRDN | TIVA_RCC_MOSCDIS);
+  rcc |= ((TIVA_XTAL | TIVA_OSCSRC | TIVA_MOSCDIS) & (TIVA_RCC_XTAL_MASK | TIVA_RCC_OSCSRC_MASK | TIVA_RCC_MOSCDIS));
+  rcc2 &= ~(TIVA_RCC2_OSCSRC2_MASK | TIVA_RCC2_PWRDN2);
+  rcc2 |= ((TIVA_OSCSRC | TIVA_DIV400) & (TIVA_RCC2_OSCSRC2_MASK | TIVA_RCC2_DIV400));
+  
+  /* write */
+  SYSCTL->RCC = rcc;
+  SYSCTL->RCC2 = rcc2;
+  for(i = 100000; i; i--);
+
+  /* 3. Select the desired system divider (SYSDIV) in RCC and RCC2 and set the
+   * USESYSDIV bit in RCC. The SYSDIV field determines the system frequency for
+   * the microcontroller. */
+  /* modify */
+  rcc &= ~TIVA_RCC_SYSDIV_MASK;
+  rcc |= (TIVA_SYSDIV & TIVA_RCC_SYSDIV_MASK) | TIVA_USESYSDIV;
+  rcc2 &= ~(TIVA_RCC2_SYSDIV2_MASK | TIVA_RCC2_SYSDIV2LSB);
+  rcc2 |= ((TIVA_SYSDIV2 | TIVA_SYSDIV2LSB) & (TIVA_RCC2_SYSDIV2_MASK | TIVA_RCC2_SYSDIV2LSB));
+  
+  /* write */
+  SYSCTL->RCC = rcc;
+  SYSCTL->RCC2 = rcc2;
+
+  /* 4. Wait for the PLL to lock by polling the PLLLRIS bit in the Raw
+   * Interrupt Status (RIS) register. */
+  while ((SYSCTL->RIS & SYSCTL_RIS_PLLLRIS) == 0);
+
+  /* 5. Enable use of the PLL by clearing the BYPASS bit in RCC and RCC2. */
+  rcc &= ~TIVA_RCC_BYPASS;
+  rcc2 &= ~TIVA_RCC2_BYPASS2;
+  rcc |= (TIVA_BYPASS_VALUE << 11);
+  rcc2 |= (TIVA_BYPASS_VALUE << 11);
+  SYSCTL->RCC = rcc;
+  SYSCTL->RCC2 = rcc2;
+
+#if HAL_USE_PWM
+  SYSCTL->RCC |= TIVA_PWM_FIELDS;
+#endif
+}
+
+/**
+ * @}
+ */