diff options
Diffstat (limited to 'os/hal/ports/TIVA/LLD/GPTM/hal_st_lld.c')
-rw-r--r-- | os/hal/ports/TIVA/LLD/GPTM/hal_st_lld.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/os/hal/ports/TIVA/LLD/GPTM/hal_st_lld.c b/os/hal/ports/TIVA/LLD/GPTM/hal_st_lld.c new file mode 100644 index 0000000..d87652b --- /dev/null +++ b/os/hal/ports/TIVA/LLD/GPTM/hal_st_lld.c @@ -0,0 +1,255 @@ +/* + Copyright (C) 2014..2016 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/LLD/st_lld.c + * @brief ST Driver subsystem low level driver code. + * + * @addtogroup ST + * @{ + */ + +#include "hal.h" + +#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE) || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +#if OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING + +#if (TIVA_ST_USE_WIDE_TIMER == TRUE) + +#if TIVA_ST_TIMER_NUMBER == 0 +#define ST_HANDLER TIVA_WGPT0A_HANDLER +#define ST_NUMBER TIVA_WGPT0A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCWTIMER |= (1 << 0)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRWTIMER & (1 << 0))) + +#elif TIVA_ST_TIMER_NUMBER == 1 +#define ST_HANDLER TIVA_WGPT1A_HANDLER +#define ST_NUMBER TIVA_WGPT1A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCWTIMER |= (1 << 1)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRWTIMER & (1 << 1))) + +#elif TIVA_ST_TIMER_NUMBER == 2 +#define ST_HANDLER TIVA_WGPT2A_HANDLER +#define ST_NUMBER TIVA_WGPT2A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCWTIMER |= (1 << 2)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRWTIMER & (1 << 2))) + +#elif TIVA_ST_TIMER_NUMBER == 3 +#define ST_HANDLER TIVA_WGPT3A_HANDLER +#define ST_NUMBER TIVA_WGPT3A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCWTIMER |= (1 << 3)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRWTIMER & (1 << 3))) + +#elif TIVA_ST_TIMER_NUMBER == 4 +#define ST_HANDLER TIVA_WGPT4A_HANDLER +#define ST_NUMBER TIVA_WGPT4A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCWTIMER |= (1 << 4)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRWTIMER & (1 << 4))) + +#elif TIVA_ST_TIMER_NUMBER == 5 +#define ST_HANDLER TIVA_WGPT5A_HANDLER +#define ST_NUMBER TIVA_WGPT5A_NUMBER +#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 5)) +#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 5))) + +#else +#error "TIVA_ST_USE_TIMER specifies an unsupported timer" +#endif + +#if (ST_CLOCK_SRC / OSAL_ST_FREQUENCY) - 1 > 0xFFFF +#error "the selected ST frequency is not obtainable because TIM timer prescaler limits" +#endif + +#elif (TIVA_ST_USE_WIDE_TIMER == FALSE) + +#if TIVA_ST_TIMER_NUMBER == 0 +#define ST_HANDLER TIVA_GPT0A_HANDLER +#define ST_NUMBER TIVA_GPT0A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 0)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 0))) + +#elif TIVA_ST_TIMER_NUMBER == 1 +#define ST_HANDLER TIVA_GPT1A_HANDLER +#define ST_NUMBER TIVA_GPT1A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 1)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 1))) + +#elif TIVA_ST_TIMER_NUMBER == 2 +#define ST_HANDLER TIVA_GPT2A_HANDLER +#define ST_NUMBER TIVA_GPT2A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 2)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 2))) + +#elif TIVA_ST_TIMER_NUMBER == 3 +#define ST_HANDLER TIVA_GPT3A_HANDLER +#define ST_NUMBER TIVA_GPT3A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 3)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 3))) + +#elif TIVA_ST_TIMER_NUMBER == 4 +#define ST_HANDLER TIVA_GPT4A_HANDLER +#define ST_NUMBER TIVA_GPT4A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 4)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 4))) + +#elif TIVA_ST_TIMER_NUMBER == 5 +#define ST_HANDLER TIVA_GPT5A_HANDLER +#define ST_NUMBER TIVA_GPT5A_NUMBER +#define ST_ENABLE_CLOCK() (SYSCTL->RCGCTIMER |= (1 << 5)) +#define ST_WAIT_CLOCK() while (!(SYSCTL->PRTIMER & (1 << 5))) + +#else +#error "TIVA_ST_USE_TIMER specifies an unsupported timer" +#endif + +#if (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1 > 0xFF +#error "the selected ST frequency is not obtainable because TIM timer prescaler limits" +#endif + +#endif + +#if TIVA_SYSCLK % OSAL_ST_FREQUENCY != 0 +#error "the selected ST frequency is not obtainable because integer rounding" +#endif + +#endif + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +#if (OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC) || defined(__DOXYGEN__) +/** + * @brief System Timer vector. + * @details This interrupt is used for system tick in periodic mode. + * + * @isr + */ +OSAL_IRQ_HANDLER(SysTick_Handler) +{ + OSAL_IRQ_PROLOGUE(); + + osalSysLockFromISR(); + osalOsTimerHandlerI(); + osalSysUnlockFromISR(); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */ + +#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) || defined(__DOXYGEN__) +/** + * @brief GPT interrupt handler. + * @details This interrupt is used for system tick in free running mode. + * + * @isr + */ +OSAL_IRQ_HANDLER(ST_HANDLER) +{ + uint32_t mis; + + OSAL_IRQ_PROLOGUE(); + + mis = HWREG(TIVA_ST_TIM + TIMER_O_MIS); + HWREG(TIVA_ST_TIM + TIMER_O_ICR) = mis; + + if (mis & TIMER_IMR_TAMIM) { + osalSysLockFromISR(); + osalOsTimerHandlerI(); + osalSysUnlockFromISR(); + } + + OSAL_IRQ_EPILOGUE(); +} +#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */ + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level ST driver initialization. + * + * @notapi + */ +void st_lld_init(void) +{ +#if OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING + /* Free running counter mode.*/ + + /* Enabling timer clock.*/ + ST_ENABLE_CLOCK(); + + /* Wait until timer peripheral is ready */ + ST_WAIT_CLOCK(); + + /* Initializing the counter in free running down mode.*/ + HWREG(TIVA_ST_TIM + TIMER_O_CTL) = 0; + HWREG(TIVA_ST_TIM + TIMER_O_CFG) = TIMER_CFG_16_BIT; /* Timer split mode */ + HWREG(TIVA_ST_TIM + TIMER_O_TAMR) = ( + TIMER_TAMR_TAMR_PERIOD | /* Periodic mode */ + TIMER_TAMR_TAMIE | /* Match interrupt enable */ + TIMER_TAMR_TASNAPS); /* Snapshot mode */ + + HWREG(TIVA_ST_TIM + TIMER_O_TAPR) = (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1; + HWREG(TIVA_ST_TIM + TIMER_O_CTL) = ( + TIMER_CTL_TAEN | /* Timer A enable */ + TIMER_CTL_TASTALL); /* Timer A stall when paused */ + + /* IRQ enabled.*/ + nvicEnableVector(ST_NUMBER, TIVA_ST_IRQ_PRIORITY); +#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */ + +#if OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC + /* Periodic systick mode, the Cortex-Mx internal systick timer is used + in this mode.*/ + SysTick->LOAD = (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1; + SysTick->VAL = 0; + SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | + SysTick_CTRL_ENABLE_Msk | + SysTick_CTRL_TICKINT_Msk; + + /* IRQ enabled.*/ + nvicSetSystemHandlerPriority(HANDLER_SYSTICK, TIVA_ST_IRQ_PRIORITY); +#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */ +} + +#endif /* OSAL_ST_MODE != OSAL_ST_MODE_NONE */ + +/** + * @} + */ |