//*****************************************************************************
//
//! @brief Enables the ITM
//!
//! This function enables the ARM ITM by setting the TRCENA bit in the DEMCR
//! register.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_itm_enable(void)
{
if (g_ui32HALflags & AM_HAL_FLAGS_ITMSKIPENABLEDISABLE_M)
{
return;
}
//
// To be able to access ITM registers, set the Trace Enable bit
// in the Debug Exception and Monitor Control Register (DEMCR).
//
AM_REG(SYSCTRL, DEMCR) |= AM_REG_SYSCTRL_DEMCR_TRCENA(1);
while ( !(AM_REG(SYSCTRL, DEMCR) & AM_REG_SYSCTRL_DEMCR_TRCENA(1)) );
//
// Write the key to the ITM Lock Access register to unlock the ITM_TCR.
//
AM_REGVAL(AM_REG_ITM_LOCKAREG_O) = AM_REG_ITM_LOCKAREG_KEYVAL;
//
// Set the enable bits in the ITM trace enable register, and the ITM
// control registers to enable trace data output.
//
AM_REGVAL(AM_REG_ITM_TPR_O) = 0x0000000f;
AM_REGVAL(AM_REG_ITM_TER_O) = 0xffffffff;
//
// Write to the ITM control and status register (don't enable yet).
//
AM_REGVAL(AM_REG_ITM_TCR_O) =
AM_WRITE_SM(AM_REG_ITM_TCR_ATB_ID, 0x15) |
AM_WRITE_SM(AM_REG_ITM_TCR_TS_FREQ, 1) |
AM_WRITE_SM(AM_REG_ITM_TCR_TS_PRESCALE, 1) |
AM_WRITE_SM(AM_REG_ITM_TCR_SWV_ENABLE, 1) |
AM_WRITE_SM(AM_REG_ITM_TCR_DWT_ENABLE, 0) |
AM_WRITE_SM(AM_REG_ITM_TCR_SYNC_ENABLE, 0) |
AM_WRITE_SM(AM_REG_ITM_TCR_TS_ENABLE, 0) |
AM_WRITE_SM(AM_REG_ITM_TCR_ITM_ENABLE, 1);
}
//*****************************************************************************
//
//! @brief Configure the watchdog timer.
//!
//! @param psConfig - pointer to a configuration structure containing the
//! desired watchdog settings.
//!
//! This function will set the watchdog configuration register based on the
//! user's desired settings listed in the structure referenced by psConfig. If
//! the structure indicates that watchdog interrupts are desired, this function
//! will also set the interrupt enable bit in the configuration register.
//!
//! @note In order to actually receive watchdog interrupt and/or watchdog reset
//! events, the caller will also need to make sure that the watchdog interrupt
//! vector is enabled in the ARM NVIC, and that watchdog resets are enabled in
//! the reset generator module. Otherwise, the watchdog-generated interrupt and
//! reset events will have no effect.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_wdt_init(const am_hal_wdt_config_t *psConfig)
{
uint32_t ui32ConfigVal;
uint16_t ui16IntCount, ui16ResetCount;
bool bResetEnabled = psConfig->ui32Config & AM_HAL_WDT_ENABLE_RESET;
bool bInterruptEnabled = psConfig->ui32Config & AM_HAL_WDT_ENABLE_INTERRUPT;
//
// Read the desired settings from the psConfig structure.
//
ui16IntCount = psConfig->ui16InterruptCount;
ui16ResetCount = psConfig->ui16ResetCount;
//
// Write the interrupt and reset count values to a temporary variable.
//
// Accept the passed Config value, but clear the Counts that we are about to set.
ui32ConfigVal = psConfig->ui32Config & ~(AM_REG_WDT_CFG_INTVAL_M | AM_REG_WDT_CFG_RESVAL_M);
ui32ConfigVal |= AM_WRITE_SM(AM_REG_WDT_CFG_INTVAL, ui16IntCount);
ui32ConfigVal |= AM_WRITE_SM(AM_REG_WDT_CFG_RESVAL, ui16ResetCount);
//
// If interrupts should be enabled, set the appropriate bit in the
// temporary variable. Also, enable the interrupt in INTEN register in the
// watchdog module.
//
if ( bInterruptEnabled )
{
//
// Enable the watchdog interrupt if the configuration calls for them.
//
AM_REGn(WDT, 0, INTEN) |= AM_REG_WDT_INTEN_WDT_M;
}
else
{
//
// Disable the watchdog interrupt if the configuration doesn't call for
// watchdog interrupts.
//
AM_REGn(WDT, 0, INTEN) &= ~AM_REG_WDT_INTEN_WDT_M;
}
//
// If resets should be enabled, set the appropriate bit in the temporary
// variable.
//
if ( bResetEnabled )
{
//
// Also enable watchdog resets in the reset module.
//
AM_REG(RSTGEN, CFG) |= AM_REG_RSTGEN_CFG_WDREN_M;
}
else
{
//
// Disable watchdog resets in the reset module.
//
AM_REG(RSTGEN, CFG) &= ~AM_REG_RSTGEN_CFG_WDREN_M;
}
//
// Check for a user specified clock select. If none specified then
// set 128Hz.
//
if ( !(psConfig->ui32Config & AM_REG_WDT_CFG_CLKSEL_M) )
{
ui32ConfigVal |= AM_REG_WDT_CFG_CLKSEL_128HZ;
}
//
// Write the saved value to the watchdog configuration register.
//
AM_REGn(WDT, 0, CFG) = ui32ConfigVal;
}
