/****************************************************************************** * @brief Main function * The main file starts a timer and uses PRS to trigger an ADC conversion. * It waits in EM1 until the ADC conversion is complete, then prints the * result on the lcd. *****************************************************************************/ int main(void) { /* Initialize chip */ CHIP_Init(); SegmentLCD_Init(false); /* Enable clocks required */ CMU_ClockEnable(cmuClock_ADC0, true); CMU_ClockEnable(cmuClock_PRS, true); CMU_ClockEnable(cmuClock_TIMER0, true); /* Select TIMER0 as source and TIMER0OF (Timer0 overflow) as signal (rising edge) */ PRS_SourceSignalSet(0, PRS_CH_CTRL_SOURCESEL_TIMER0, PRS_CH_CTRL_SIGSEL_TIMER0OF, prsEdgePos); ADCConfig(); TimerConfig(); /* Stay in this loop forever */ while (1) { /* Enter EM1 and wait for timer triggered adc conversion */ EMU_EnterEM1(); /* Write result to LCD */ SegmentLCD_Number(adcResult); /* Do other stuff */ int i; for (i = 0; i < 10000; i++) ; } }
/***************************************************************************//** * @brief * Enable PRS and configure TIMER TOP value for different sampling frequency. * @param bufferSize - Buffer size to setup sampling frequency *******************************************************************************/ void setTopValue(uint16_t bufferSize) { /* Select TIMER as source and Timer overflow as signal */ PRS_SourceSignalSet(DAC_PRS_CH, TIMER_PRS, TIMER_SRC, prsEdgeOff); #if SPEEX_BAND == WIDEBAND /* Setup sampling frequency for WB to play NB or WB */ if (bufferSize < SAMPLE_SIZE) { TIMER_USED->TOP = SAMPLE_8K; } else { TIMER_USED->TOP = SAMPLE_16K; } #elif SPEEX_BAND == ULTRAWIDEBAND /* Setup sampling frequency for UWB to play NB or WB or UWB */ if (bufferSize < SAMPLE_SIZE/2) { TIMER_USED->TOP = SAMPLE_8K; } else if (bufferSize < SAMPLE_SIZE) { TIMER_USED->TOP = SAMPLE_16K; } else { TIMER_USED->TOP = SAMPLE_32K; } #endif /* Sampling frequency is fixed on codec, NB8K and NB */ TIMER_USED->CMD = TIMER_CMD_START; }
void setupPRS( void ) { PRS_LevelSet(0, 1 << (PRS_CHANNEL_ADC + _PRS_SWLEVEL_CH0LEVEL_SHIFT)); PRS_SourceSignalSet(PRS_CHANNEL_ADC, PRS_CH_CTRL_SOURCESEL_TIMER0, PRS_CH_CTRL_SIGSEL_TIMER0OF, prsEdgePos); }
/***************************************************************************//** * @brief * Configure PRS usage for this application. * * @param[in] prsChannel * PRS channel to use. *******************************************************************************/ static void preampPRSConfig(unsigned int prsChannel) { PRS_LevelSet(0, 1 << (prsChannel + _PRS_SWLEVEL_CH0LEVEL_SHIFT)); PRS_SourceSignalSet(prsChannel, PRS_CH_CTRL_SOURCESEL_TIMER0, PRS_CH_CTRL_SIGSEL_TIMER0OF, prsEdgePos); }
/***************************************************************************//** * @brief * Configure PRS usage for this application. * * @param[in] prsChannel * PRS channel to use. *******************************************************************************/ static void guitarPRSConfig(unsigned int prsChannel) { /* Set channel to 0. */ PRS_LevelSet(0, 1 << (prsChannel + _PRS_SWLEVEL_CH0LEVEL_SHIFT)); /* Configure PRS channel with positive edge on Timer0 overflow as source. */ /* Will result in a 1 HFclk pulse on the PRS channel, which can trigger the ADC. */ PRS_SourceSignalSet(prsChannel, PRS_CH_CTRL_SOURCESEL_TIMER0, PRS_CH_CTRL_SIGSEL_TIMER0OF, prsEdgePos); }
/**************************************************************************//** * @brief Main function * Main is called from __iar_program_start, see assembly startup file *****************************************************************************/ int main(void) { /* Initialize chip */ CHIP_Init(); /* Enable clock for GPIO module */ CMU_ClockEnable(cmuClock_GPIO, true); /* Enable clock for ADC0 module */ CMU_ClockEnable(cmuClock_ADC0, true); /* Enable clock for PRS module */ CMU_ClockEnable(cmuClock_PRS, true); /* Configure PD8 as an input for PB0 button with filter enable (out = 1)*/ GPIO_PinModeSet(gpioPortD, 8, gpioModeInput, 1); /* Select PD8 as PRS output */ GPIO->EXTIPSELH = (GPIO->EXTIPSELH & !_GPIO_EXTIPSELH_EXTIPSEL8_MASK ) | GPIO_EXTIPSELH_EXTIPSEL8_PORTD; /* Enable PRS sense */ GPIO->INSENSE = GPIO->INSENSE | GPIO_INSENSE_PRS; /* Select GPIO as source and GPIOPIN8 as signal (falling edge) */ PRS_SourceSignalSet(0, PRS_CH_CTRL_SOURCESEL_GPIOH, PRS_CH_CTRL_SIGSEL_GPIOPIN8, prsEdgeNeg); /* Initialize ADC common parts for both single conversion and scan sequence */ ADC_Init(ADC0, &ADCInit); /* Initialize ADC single sample conversion */ ADC_InitSingle(ADC0, &ADCInitSingle); /* Enable ADC Interrupt when Single Conversion Complete */ ADC0->IEN = ADC_IEN_SINGLE; /* Enable ADC interrupt vector in NVIC*/ NVIC_EnableIRQ(ADC0_IRQn); while(1) { /* Enter EM1 */ EMU_EnterEM1(); /* After ADC Single conversion wake up -> Delay 1000mS */ Delay(1000); } }
/**************************************************************************//** * @brief Configure TIMER to trigger ADC through PRS at a set sample rate *****************************************************************************/ void setupAdc(void) { ADC_Init_TypeDef adcInit = ADC_INIT_DEFAULT; ADC_InitSingle_TypeDef adcInitSingle = ADC_INITSINGLE_DEFAULT; /* Configure ADC single mode to sample Ref/2 */ adcInit.prescale = ADC_PrescaleCalc(7000000, 0); /* Set highest allowed prescaler */ ADC_Init(ADC0, &adcInit); adcInitSingle.input = adcSingleInpVrefDiv2; /* Reference */ adcInitSingle.prsEnable = true; adcInitSingle.prsSel = adcPRSSELCh0; /* Triggered by PRS CH0 */ ADC_InitSingle(ADC0, &adcInitSingle); /* Connect PRS channel 0 to TIMER overflow */ PRS_SourceSignalSet(0, PRS_CH_CTRL_SOURCESEL_TIMER0, PRS_CH_CTRL_SIGSEL_TIMER0OF, prsEdgeOff); /* Configure TIMER to trigger 100 kHz sampling rate */ TIMER_TopSet(TIMER0, CMU_ClockFreqGet(cmuClock_TIMER0)/ADCSAMPLESPERSEC); TIMER_Enable(TIMER0, true); }
/**************************************************************************//** * @brief ACMP_setup * Configures and starts the ACMP *****************************************************************************/ void ACMP_setup(void) { /* Enable necessary clocks */ CMU_ClockEnable(cmuClock_ACMP0, true); CMU_ClockEnable(cmuClock_GPIO, true); /* Configure PC4 as input with pull down for ACMP channel 4 input */ GPIO_PinModeSet(gpioPortC, 4, gpioModeInputPullFilter, 0); /* Analog comparator parameters */ const ACMP_Init_TypeDef acmpInit = { .fullBias = false, /* no full bias current*/ .halfBias = false, /* no half bias current */ .biasProg = 7, /* Biasprog current 1.4 uA */ .interruptOnFallingEdge = false, /* disable interrupt for falling edge */ .interruptOnRisingEdge = false, /* disable interrupt for rising edge */ .warmTime = acmpWarmTime256, /* Warm-up time in clock cycles, should be >140 cycles for >10us warm-up @ 14MHz */ .hysteresisLevel = acmpHysteresisLevel0, /* Hysteresis level 0 - no hysteresis */ .inactiveValue = 0, /* Inactive comparator output value */ .lowPowerReferenceEnabled = false, /* Low power reference mode disabled */ .vddLevel = 32, /* Vdd reference scaling of 32 */ }; /* Init ACMP and set ACMP channel 4 as positive input and scaled Vdd as negative input */ ACMP_Init(ACMP0, &acmpInit); ACMP_ChannelSet(ACMP0, acmpChannelVDD, acmpChannel4); ACMP_Enable(ACMP0); } /**************************************************************************//** * @brief PRS_ScanChannel * Waits for activity on a selected PRS channel and writes on the LCD when activity occurs * * @param[in] timer * Pointer to TIMER peripheral register block. * * @param[in] prsCh * PRS Channel to be monitored * * @param[in] edgeType * Signal edge to be monitored/captured *****************************************************************************/ void PRS_ScanChannel(TIMER_TypeDef *timer, TIMER_PRSSEL_TypeDef prsCh, TIMER_Edge_TypeDef edgeType) { /* enable the clock for the correct timer */ #define TIMER_Clock(T) (T==TIMER0 ? cmuClock_TIMER0 : \ T==TIMER1 ? cmuClock_TIMER1 : 0) /* Enable necessary clocks */ CMU_ClockEnable((CMU_Clock_TypeDef)TIMER_Clock(timer), true); /* Initialize LCD */ SegmentLCD_Init(false); /* Select CC channel parameters */ const TIMER_InitCC_TypeDef timerCCInit = { .eventCtrl = timerEventFalling, /* input capture event control */ .edge = edgeType, /* input capture on falling edge */ .prsSel = prsCh, /* prs channel select channel 5*/ .cufoa = timerOutputActionNone, /* no action on counter underflow */ .cofoa = timerOutputActionNone, /* no action on counter overflow */ .cmoa = timerOutputActionNone, /* no action on counter match */ .mode = timerCCModeCapture, /* CC channel mode capture */ .filter = false, /* no filter */ .prsInput = true, /* CC channel PRS input */ .coist = false, /* comparator output initial state */ .outInvert = false, /* no output invert */ }; /* Initialize TIMER0 CC0 */ TIMER_InitCC(timer, 0, &timerCCInit); /* Select timer parameters */ const TIMER_Init_TypeDef timerInit = { .enable = true, /* start counting when init complete */ .debugRun = false, /* counter not running on debug halt */ .prescale = timerPrescale1024, /* prescaler of 64 */ .clkSel = timerClkSelHFPerClk, /* TIMER0 clocked by the HFPERCLK */ .fallAction = timerInputActionNone, /* stop counter on falling edge */ .riseAction = timerInputActionNone, /* reload and start on rising edge */ .mode = timerModeUp, /* counting up */ .dmaClrAct = false, /* no DMA */ .quadModeX4 = false, /* no quad decoding */ .oneShot = false, /* counting up constinuously */ .sync = false, /* no start/stop/reload by other timers */ }; /* Initialize TIMER0 */ TIMER_Init(timer, &timerInit); /* Poll the Input Capture Valid flag in the Status register The program will hang at this point waiting for activity on this channel */ while(!((TIMER0->STATUS & _TIMER_STATUS_ICV0_MASK )>>16)); } /**************************************************************************//** * @brief Main function * Main is called from __iar_program_start, see assembly startup file *****************************************************************************/ int main(void) { /* Align different chip revisions*/ CHIP_Init(); /* Initialise the ACMP */ ACMP_setup(); /* PRS setup */ /* Enable clock for PRS and select ACMP as source and ACMP0OUT (ACMP0 OUTPUT) as signal for channel 5 */ CMU_ClockEnable(cmuClock_PRS, true); PRS_SourceSignalSet(5, PRS_CH_CTRL_SOURCESEL_ACMP0, PRS_CH_CTRL_SIGSEL_ACMP0OUT, prsEdgeOff); /* Start PRS scan This function will halt the program while there is no PRS activity This function assumes that the PRS has been setup previously */ PRS_ScanChannel(TIMER0, timerPRSSELCh5, timerEdgeFalling); /* Write PRS and channel number on the LCD to acknowledge PRS activity */ SegmentLCD_Write("PRS"); SegmentLCD_Number((int)timerPRSSELCh5); while(1) { /* Enter EM1 while waiting for capture. */ EMU_EnterEM1(); } }
/**************************************************************************//** * @brief TIMER0_setup * Configures the TIMER *****************************************************************************/ void TIMER_setup(void) { /* Enable necessary clocks */ CMU_ClockEnable(cmuClock_TIMER0, true); CMU_ClockEnable(cmuClock_PRS, true); /* Select CC channel parameters */ TIMER_InitCC_TypeDef timerCCInit = { .eventCtrl = timerEventEveryEdge, /* Input capture event control */ .edge = timerEdgeBoth, /* Input capture on falling edge */ .prsSel = timerPRSSELCh5, /* Prs channel select channel 5*/ .cufoa = timerOutputActionNone, /* No action on counter underflow */ .cofoa = timerOutputActionNone, /* No action on counter overflow */ .cmoa = timerOutputActionNone, /* No action on counter match */ .mode = timerCCModeCapture, /* CC channel mode capture */ .filter = false, /* No filter */ .prsInput = true, /* CC channel PRS input */ .coist = false, /* Comparator output initial state */ .outInvert = false, /* No output invert */ }; /* Initialize TIMER0 CC0 channel */ TIMER_InitCC(HIJACK_RX_TIMER, 0, &timerCCInit); /* Select timer parameters */ const TIMER_Init_TypeDef timerInit = { .enable = false, /* Do not start counting when init complete */ .debugRun = false, /* Counter not running on debug halt */ .prescale = HIJACK_TIMER_RESOLUTION, /* Prescaler of 1 */ .clkSel = timerClkSelHFPerClk, /* TIMER0 clocked by the HFPERCLK */ .fallAction = timerInputActionReloadStart, /* Stop counter on falling edge */ .riseAction = timerInputActionReloadStart, /* Reload and start on rising edge */ .mode = timerModeUp, /* Counting up */ .dmaClrAct = false, /* No DMA */ .quadModeX4 = false, /* No quad decoding */ .oneShot = false, /* Counting up constinuously */ .sync = false, /* No start/stop/reload by other timers */ }; /* Initialize TIMER0 */ TIMER_Init(HIJACK_RX_TIMER, &timerInit); /* PRS setup */ /* Select ACMP as source and ACMP0OUT (ACMP0 OUTPUT) as signal */ PRS_SourceSignalSet(5, PRS_CH_CTRL_SOURCESEL_ACMP0, PRS_CH_CTRL_SIGSEL_ACMP0OUT, prsEdgeOff); /* Enable CC0 interrupt */ TIMER_IntEnable(HIJACK_RX_TIMER, TIMER_IF_CC0); /* Enable TIMER0 interrupt vector in NVIC */ NVIC_EnableIRQ(TIMER0_IRQn); } /**************************************************************************//** * @brief ACMP_setup * Configures and starts the ACMP *****************************************************************************/ static void ACMP_setup(void) { /* Enable necessary clocks */ CMU_ClockEnable(HIJACK_RX_ACMPCLK, true); CMU_ClockEnable(cmuClock_GPIO, true); /* Configure ACMP input pin. */ GPIO_PinModeSet(HIJACK_RX_GPIO_PORT, HIJACK_RX_GPIO_PIN, gpioModeInput, 0); /* Analog comparator parameters */ const ACMP_Init_TypeDef acmpInit = { .fullBias = false, /* No full bias current*/ .halfBias = true, /* No half bias current */ .biasProg = 2, /* Biasprog current 1.4 uA */ .interruptOnFallingEdge = false, /* Disable interrupt for falling edge */ .interruptOnRisingEdge = false, /* Disable interrupt for rising edge */ .warmTime = acmpWarmTime256, /* Warm-up time in clock cycles, should be >140 cycles for >10us warm-up @ 14MHz */ .hysteresisLevel = acmpHysteresisLevel7, /* Hysteresis level 0 - no hysteresis */ .inactiveValue = 1, /* Inactive comparator output value */ .lowPowerReferenceEnabled = false, /* Low power reference mode disabled */ .vddLevel = HIJACK_RX_ACMP_LEVEL, /* Vdd reference scaling of 32 */ }; /* Use ACMP0 output, PD6 . */ //GPIO_PinModeSet(gpioPortD, 6, gpioModePushPull, 0); //ACMP_GPIOSetup(ACMP0, 2, true, false); /* Init ACMP and set ACMP channel 4 as positive input and scaled Vdd as negative input */ ACMP_Init(HIJACK_RX_ACMP, &acmpInit); ACMP_ChannelSet(HIJACK_RX_ACMP, HIJACK_RX_ACMP_NEG, HIJACK_RX_ACMP_CH); ACMP_Enable(HIJACK_RX_ACMP); } /** * @brief calculate whether cnt is in 500us region * ticker = 64Mhz/128 = 2us * 475us < cnt < 510us * */ static chk_result_t IsTime2Detect(uint32_t inv) { chk_result_t ret; if( inv < HIJACK_DEC_NUM_TICKS_MIN){ offset = inv; ret = pass; } else if ( ( inv <= HIJACK_DEC_NUM_TICKS_MAX ) && ( inv >= HIJACK_DEC_NUM_TICKS_MIN ) ) { offset = 0; inv = 0; ret = suit; } else{ offset = 0; inv = 0; ret = error; } return ret; } /* * Find phase remain or phase reversal. */ static void dec_parser(uint8_t bit_msk, state_t state) { if ( ( suit == IsTime2Detect(inv) ) ){ //it's time to determine if( falling == cur_edge ){ dec.data &= ~(1 << bit_msk); #if DEC_DEBUG == 1 uartPutChar( '+' ) ; uartPutChar( '_' ) ; #endif//DEC_DEBUG == 1 } else{ dec.data |= (1 << bit_msk); #if DEC_DEBUG == 1 uartPutChar( '_' ) ; uartPutChar( '+' ) ; #endif//DEC_DEBUG == 1 dec.odd++; } dec.state = state; //state switch } else if ( error == IsTime2Detect(inv) ){ //wait for edge detection time dec.state = Waiting; //state switch } } /**************************************************************************//** * @brief decode state machine * Invoke in TIMER_ISR for decoding. *****************************************************************************/ void decode_machine(void) { inv = offset + cur_stamp; //update offset #if 0 if( dec.state > Waiting ){ USART_printHexBy16u(inv); if(cur_edge == rising){ uartPutChar( '\\' ) ; } else{ uartPutChar( '/' ) ; } } #endif switch (dec.state){ case Waiting: /* go to start bit if rising edge exist. */ if (rising == cur_edge) { dec.state = Sta0; offset = 0; inv = 0; } break; // case Sta0: if( ( suit == IsTime2Detect(inv) ) && ( falling == cur_edge ) ){ dec.data = 0; //clear data field for store new potential data dec.odd = 0; //clear odd field parity counter dec.state = Bit0; #if DEC_DEBUG == 1 uartPutChar( 'S' ) ; uartPutChar( '+' ) ; uartPutChar( '_' ) ; #endif } else{ dec.state = Waiting; } break; // case Bit0: #if DEC_DEBUG == 1 uartPutChar( '0' ) ; #endif dec_parser(BIT0, Bit1); break; // case Bit1: #if DEC_DEBUG == 1 uartPutChar( '1' ) ; #endif dec_parser(BIT1, Bit2); break; // case Bit2: #if DEC_DEBUG == 1 uartPutChar( '2' ) ; #endif dec_parser(BIT2, Bit3); break; // case Bit3: #if DEC_DEBUG == 1 uartPutChar( '3' ) ; #endif dec_parser(BIT3, Bit4); break; // case Bit4: #if DEC_DEBUG == 1 uartPutChar( '4' ) ; #endif dec_parser(BIT4, Bit5); break; // case Bit5: #if DEC_DEBUG == 1 uartPutChar( '5' ) ; #endif dec_parser(BIT5, Bit6); break; // case Bit6: #if DEC_DEBUG == 1 uartPutChar( '6' ) ; #endif dec_parser(BIT6, Bit7); break; // case Bit7: #if DEC_DEBUG == 1 uartPutChar( '7' ) ; #endif dec_parser(BIT7, Parity); break; // case Parity: if ( ( suit == IsTime2Detect(inv) ) ){ //it's time to determine if( rising == cur_edge ){ dec.odd++; #if DEC_DEBUG == 1 uartPutChar( '_' ) ; uartPutChar( '+' ) ; #endif } else{ #if DEC_DEBUG == 1 uartPutChar( '+' ) ; uartPutChar( '_' ) ; #endif } #if DEC_DEBUG == 1 uartPutChar( dec.odd + 0x30) ; #endif if( 1 == (dec.odd%2)){ //parity pass dec.state = Sto0; } else{ //parity failed dec.state = Waiting; } } else if ( error == IsTime2Detect(inv) ){ //wait for edge detection time dec.state = Waiting; } break; // case Sto0: if ( ( suit == IsTime2Detect(inv) ) ){ //it's time to determine if( rising == cur_edge ){ //stop bit is rising edge USART_txByte(dec.data); #if DEC_DEBUG == 1 uartPutChar( '_' ) ; uartPutChar( '+' ) ; #endif HIJACKPutData(&dec.data, &decBuf, sizeof(uint8_t)); } else{ #if DEC_DEBUG == 1 uartPutChar( '+' ) ; uartPutChar( '_' ) ; #endif } dec.state = Waiting; #if DEC_DEBUG == 1 uartPutChar( '\r' ) ; uartPutChar( '\n' ) ; #endif } else if ( error == IsTime2Detect(inv) ){ //wait for edge detection time dec.state = Waiting; } break; // default: break; // } }