void time_init(void)
{
extern const hwtimer_devif_t kSystickDevif;
extern const hwtimer_devif_t kPitDevif;
#define HWTIMER_LL_DEVIF kPitDevif // Use hardware timer PIT
#define HWTIMER_LL_SRCCLK kBusClock // Source Clock for PIT
#define HWTIMER_LL_ID 1
#define HWTIMER_PERIOD 1000 // 1 ms interval
if (kHwtimerSuccess != HWTIMER_SYS_Init(&hwtimer, &HWTIMER_LL_DEVIF, HWTIMER_LL_ID, 5, NULL))
{
USB_PRINTF("\r\nError: hwtimer initialization.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_SetPeriod(&hwtimer, HWTIMER_LL_SRCCLK, HWTIMER_PERIOD))
{
USB_PRINTF("\r\nError: hwtimer set period.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_RegisterCallback(&hwtimer, hwtimer_callback, NULL))
{
USB_PRINTF("\r\nError: hwtimer callback registration.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_Start(&hwtimer))
{
USB_PRINTF("\r\nError: hwtimer start.\r\n");
}
}
void time_init(void)
{
if (kHwtimerSuccess != HWTIMER_SYS_Init(&hwtimer, &HWTIMER_LL_DEVIF, HWTIMER_LL_ID, NULL))
{
USB_PRINTF("\r\nError: hwtimer initialization.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_SetPeriod(&hwtimer, HWTIMER_PERIOD))
{
USB_PRINTF("\r\nError: hwtimer set period.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_RegisterCallback(&hwtimer, hwtimer_callback, NULL))
{
USB_PRINTF("\r\nError: hwtimer callback registration.\r\n");
}
if (kHwtimerSuccess != HWTIMER_SYS_Start(&hwtimer))
{
USB_PRINTF("\r\nError: hwtimer start.\r\n");
}
OS_intr_init(HWTIMER_IRQ_NUM, HWTIMER_IRQ_PRI, 0, TRUE);
}
/*!
* \cond DOXYGEN_PRIVATE
* \brief Pre initialization - initializing requested modules for basic run of MQX.
*/
int _bsp_pre_init(void)
{
uint32_t result;
/******************************************************************************
Init gpio platform pins for LEDs, setup board clock source
******************************************************************************/
/* Macro PEX_MQX_KSDK used by PEX team */
#ifndef PEX_MQX_KSDK
hardware_init();
/* Configure PINS for default UART instance */
#if defined(BOARD_USE_LPSCI)
configure_lpsci_pins(BOARD_DEBUG_UART_INSTANCE);
#elif defined(BOARD_USE_LPUART)
configure_lpuart_pins(BOARD_DEBUG_UART_INSTANCE);
#elif defined(BOARD_USE_UART)
configure_uart_pins(BOARD_DEBUG_UART_INSTANCE);
#else
#error Default serial module is unsupported or undefined.
#endif
#endif
#if MQX_EXIT_ENABLED
extern void _bsp_exit_handler(void);
/* Set the bsp exit handler, called by _mqx_exit */
_mqx_set_exit_handler(_bsp_exit_handler);
#endif
result = _psp_int_init(BSP_FIRST_INTERRUPT_VECTOR_USED, BSP_LAST_INTERRUPT_VECTOR_USED);
if (result != MQX_OK) {
return result;
}
/******************************************************************************
Init MQX tick timer
******************************************************************************/
/* Initialize , set and run system hwtimer */
result = HWTIMER_SYS_Init(&systimer, &BSP_SYSTIMER_DEV, BSP_SYSTIMER_ID, NULL);
if (kStatus_OSA_Success != result) {
return MQX_INVALID_POINTER;
}
/* Set isr for timer*/
if (NULL == OSA_InstallIntHandler(BSP_SYSTIMER_INTERRUPT_VECTOR, HWTIMER_SYS_SystickIsrAction))
{
return kHwtimerRegisterHandlerError;
}
/* Set interrupt priority */
NVIC_SetPriority(BSP_SYSTIMER_INTERRUPT_VECTOR, MQX_TO_NVIC_PRIOR(BSP_SYSTIMER_ISR_PRIOR));
/* Disable interrupts to ensure ticks are not active until call of _sched_start_internal */
_int_disable();
result = HWTIMER_SYS_SetPeriod(&systimer, BSP_ALARM_PERIOD);
if (kStatus_OSA_Success != result) {
HWTIMER_SYS_Deinit(&systimer);
return MQX_INVALID_POINTER;
}
result = HWTIMER_SYS_RegisterCallback(&systimer,(hwtimer_callback_t)_time_notify_kernel, NULL);
if (kStatus_OSA_Success != result) {
HWTIMER_SYS_Deinit(&systimer);
return MQX_INVALID_POINTER;
}
result = HWTIMER_SYS_Start(&systimer);
if (kStatus_OSA_Success != result) {
HWTIMER_SYS_Deinit(&systimer);
return MQX_INVALID_POINTER;
}
/* Initialize the system ticks */
_time_set_ticks_per_sec(BSP_ALARM_FREQUENCY);
_time_set_hwticks_per_tick(HWTIMER_SYS_GetModulo(&systimer));
_time_set_hwtick_function(_bsp_get_hwticks, (void *)NULL);
return MQX_OK;
}
/*!
* @brief Use DAC fifo to generate sine wave on DACx_OUT
*/
int32_t dac_gen_wave(void)
{
dac_converter_config_t dacUserConfig;
uint32_t period;
// Fill the structure with configuration of software trigger
DAC_DRV_StructInitUserConfigNormal(&dacUserConfig);
// Initialize the DAC Converter
DAC_DRV_Init(DAC_INST, &dacUserConfig);
// Enable the feature of DAC internal buffer
dacBuffConfig.bufferEnable = true;
#if FSL_FEATURE_DAC_HAS_WATERMARK_SELECTION
dacBuffConfig.idxWatermarkIntEnable = false;
dacBuffConfig.watermarkMode = kDacBuffWatermarkFromUpperAs2Word;
#endif
dacBuffConfig.triggerMode = kDacTriggerBySoftware;
dacBuffConfig.dmaEnable = false;
dacBuffConfig.idxStartIntEnable = false;
dacBuffConfig.idxUpperIntEnable = false;
dacBuffConfig.upperIdx = FSL_FEATURE_DAC_BUFFER_SIZE - 1U;
#if (FSL_FEATURE_DAC_HAS_BUFFER_SWING_MODE && (FSL_FEATURE_DAC_BUFFER_SIZE == DAC_DATA_BUF_SIZE))
dacBuffConfig.buffWorkMode = kDacBuffWorkAsSwingMode;
#else
dacBuffConfig.buffWorkMode = kDacBuffWorkAsNormalMode;
#endif
DAC_DRV_ConfigBuffer(DAC_INST, &dacBuffConfig);
#if (FSL_FEATURE_DAC_HAS_BUFFER_SWING_MODE && (FSL_FEATURE_DAC_BUFFER_SIZE == DAC_DATA_BUF_SIZE))
// Fill the buffer with setting data, applicable only if the data and buffer lenght are equal
DAC_DRV_SetBuffValue(DAC_INST, 0U, FSL_FEATURE_DAC_BUFFER_SIZE, (uint16_t *)dacBuf);
#endif
// Use HW timer of systick to do SW trigger of DAC,
if (kHwtimerSuccess != HWTIMER_SYS_Init(&hwtimer, &kSystickDevif, 0, NULL))
{
return -1;
}
// Get the period the systick triggered.
// There's 30 times of systick interrupt for one period of sine wave,
// as we only have 16 data depth buffer for DAC, so we need to trigger
// 30 times of interrupt to do software trigger.
period = INPUT_SIGNAL_FREQ * (2 * DAC_DATA_BUF_SIZE - 2);
if (kHwtimerSuccess != HWTIMER_SYS_SetPeriod(&hwtimer, 1000000/period))
{
return -1;
}
// install call back for SW trigger for DAC
if (kHwtimerSuccess != HWTIMER_SYS_RegisterCallback(&hwtimer, hwtimer_callback, 0))
{
return -1;
}
// start systick timer
if (kHwtimerSuccess != HWTIMER_SYS_Start(&hwtimer))
{
return -1;
}
return 0;
}