mirror of https://github.com/ARMmbed/mbed-os.git
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/* mbed Microcontroller Library
|
|
* Copyright (c) 2017 ARM Limited
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#if DEVICE_ITM
|
|
|
|
#include "hal/itm_api.h"
|
|
#include "cmsis.h"
|
|
#include "em_cmu.h"
|
|
#include "device_peripherals.h"
|
|
|
|
#include <stdbool.h>
|
|
|
|
/* SWO frequency: 875 kHz */
|
|
static void setupSWOForPrint(void)
|
|
{
|
|
#if defined( _GPIO_ROUTE_SWOPEN_MASK ) || defined( _GPIO_ROUTEPEN_SWVPEN_MASK )
|
|
// Enable GPIO clock.
|
|
#if defined( _CMU_HFPERCLKEN0_GPIO_MASK )
|
|
CMU->HFPERCLKEN0 |= CMU_HFPERCLKEN0_GPIO;
|
|
#elif defined( _CMU_HFBUSCLKEN0_GPIO_MASK )
|
|
CMU->HFBUSCLKEN0 |= CMU_HFBUSCLKEN0_GPIO;
|
|
#endif
|
|
|
|
// Enable Serial wire output pin
|
|
#if defined( _GPIO_ROUTE_SWOPEN_MASK )
|
|
GPIO->ROUTE |= GPIO_ROUTE_SWOPEN;
|
|
#elif defined( _GPIO_ROUTEPEN_SWVPEN_MASK )
|
|
GPIO->ROUTEPEN |= GPIO_ROUTEPEN_SWVPEN;
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(_GPIO_ROUTE_MASK)
|
|
#define SWO_ROUTE ROUTE
|
|
#endif
|
|
#if defined(_GPIO_ROUTELOC0_MASK)
|
|
#define SWO_ROUTE ROUTELOC0
|
|
#endif
|
|
|
|
// Set SWO location
|
|
GPIO->SWO_ROUTE = SWO_LOCATION;
|
|
// Enable output on pin
|
|
GPIO->P[GPIO_PORT].SWO_MODE = SWO_ENABLE_OUTPUT_PIN;
|
|
|
|
// Enable debug clock AUXHFRCO
|
|
CMU->OSCENCMD = CMU_OSCENCMD_AUXHFRCOEN;
|
|
|
|
// Wait until clock is ready
|
|
while (!(CMU->STATUS & CMU_STATUS_AUXHFRCORDY));
|
|
|
|
// Enable trace in core debug
|
|
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
|
|
|
|
/* Set TPIU prescaler for the current debug clock frequency. Target frequency
|
|
is 875 kHz so we choose a divider that gives us the closest match.
|
|
Actual divider is TPI->ACPR + 1. */
|
|
uint32_t freq = CMU_ClockFreqGet(cmuClock_DBG) + (875000 / 2);
|
|
uint32_t div = freq / 875000;
|
|
TPI->ACPR = div - 1;
|
|
}
|
|
|
|
static bool swoIsInitd()
|
|
{
|
|
#if defined( _CMU_HFPERCLKEN0_GPIO_MASK )
|
|
return ((CMU->HFPERCLKEN0 & CMU_HFPERCLKEN0_GPIO) &&
|
|
(GPIO->ROUTE & GPIO_ROUTE_SWOPEN) &&
|
|
(CMU->STATUS & CMU_STATUS_AUXHFRCORDY) &&
|
|
(CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk));
|
|
#elif defined( _CMU_HFBUSCLKEN0_GPIO_MASK )
|
|
return ((CMU->HFBUSCLKEN0 & CMU_HFBUSCLKEN0_GPIO) &&
|
|
(GPIO->ROUTEPEN |= GPIO_ROUTEPEN_SWVPEN) &&
|
|
(CMU->STATUS & CMU_STATUS_AUXHFRCORDY) &&
|
|
(CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk));
|
|
#endif
|
|
}
|
|
|
|
// As SWO has to be accessible everywhere, including ISRs, we can't easily
|
|
// communicate the dependency on clocks etc. to other components - so this
|
|
// function checks that things appear to be set up, and if not re-configures
|
|
// everything
|
|
void itm_init(void)
|
|
{
|
|
if(!swoIsInitd()) {
|
|
setupSWOForPrint();
|
|
}
|
|
}
|
|
|
|
#endif
|