/*
* Stop measuring
*/
void EFM32_CapSenseSlider::stop() {
if(_running == true) {
LESENSE_ScanStop();
unblockSleepMode(EM2);
_running = false;
}
}
/** The asynchronous IRQ handler
* @param obj The I2C object which holds the transfer information
* @return Returns event flags if a transfer termination condition was met or 0 otherwise.
*/
uint32_t i2c_irq_handler_asynch(i2c_t *obj)
{
// For now, we are assuming a solely interrupt-driven implementation.
I2C_TransferReturn_TypeDef status = I2C_Transfer(obj->i2c.i2c);
switch(status) {
case i2cTransferInProgress:
// Still busy transferring, so let it.
return 0;
case i2cTransferDone:
// Transfer has completed
// Disable interrupt
i2c_enable_interrupt(obj, 0, false);
unblockSleepMode(EM1);
return I2C_EVENT_TRANSFER_COMPLETE & obj->i2c.events;
case i2cTransferNack:
// A NACK has been received while an ACK was expected. This is usually because the slave did not respond to the address.
// Disable interrupt
i2c_enable_interrupt(obj, 0, false);
unblockSleepMode(EM1);
return I2C_EVENT_ERROR_NO_SLAVE & obj->i2c.events;
default:
// An error situation has arisen.
// Disable interrupt
i2c_enable_interrupt(obj, 0, false);
unblockSleepMode(EM1);
// return error
return I2C_EVENT_ERROR & obj->i2c.events;
}
}
/** Abort ongoing asynchronous transaction.
* @param obj The I2C object
*/
void i2c_abort_asynch(i2c_t *obj)
{
// Do not deactivate I2C twice
if (!i2c_active(obj)) return;
// Disable interrupt
i2c_enable_interrupt(obj, 0, false);
// Abort
obj->i2c.i2c->CMD = I2C_CMD_STOP | I2C_CMD_ABORT;
// Block until free
while(i2c_active(obj));
unblockSleepMode(EM1);
}
/*
* Function Name: ADC_setup
* Description: Configures ADC0
*/
void LEUART_Setup(void)
{
/* Enabling the required clocks */
CMU_ClockEnable(cmuClock_LFB, true); //Enable the clock input to LETIMER
CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO); //Selecting the ULFRCO as the source clock
CMU_ClockEnable(cmuClock_LEUART0, true); //Enable the clock input to LETIMER
/* Defining the LEUART1 initialization data */
LEUART_Init_TypeDef leuart0Init =
{
.enable = leuartEnable, // Activate data reception on LEUn_TX pin.
.refFreq = 0, // Inherit the clock frequency from the LEUART clock source
.baudrate = LEUART0_BAUD, // Baudrate = 9600 bps
.databits = LEUART0_Databits, // Each LEUART frame contains 8 databits
.parity = LEUART0_Parity, // No parity bits in use
.stopbits = LEUART0_Stopbits, // Setting the number of stop bits in a frame to 2 bitperiods
};
LEUART_Init(LEUART0, &leuart0Init);
// Route LEUART1 TX,RX pin to DMA location 0
LEUART0->ROUTE = LEUART_ROUTE_TXPEN | LEUART_ROUTE_RXPEN | LEUART_ROUTE_LOCATION_LOC0;
// Enable GPIO for LEUART1. TX is on D4
GPIO_PinModeSet(gpioPortD, 4, gpioModePushPull, 0);
// Enable GPIO for LEUART1. RX is on D5
GPIO_PinModeSet(gpioPortD, 5, gpioModeInputPull, 0);
// Pull PD15(CTS pin of BLE module) to GRND
GPIO_PinModeSet(gpioPortD, 15, gpioModePushPull, 0);
}
/*
*Function name: LETIMER0_IRQHandler
*Description : Interrupt Service Routine for LETIMER.
*/
void LETIMER0_IRQHandler(void)
{
LETIMER_IntClear(LETIMER0, LETIMER_IF_UF); //Clear LETIMER0 underflow (UF) and COMP1 flag.
DMA_ActivateBasic(DMA_CHANNEL_ADC, true, false, (void *)ADC_Buffer, (void *)&(ADC0->SINGLEDATA), ADC_SAMPLES - 1);
ADC_Setup();
// ADC start
ADC_Start(ADC0, adcStartSingle);
unblockSleepMode(EM2);
blockSleepMode(EM1);
trfComplete=false;
}
void pwmout_free(pwmout_t *obj)
{
if(pwmout_disable_channel_route(pwmout_get_channel_route(obj->channel))) {
//Channel was previously enabled, so do housekeeping
unblockSleepMode(EM1);
} else {
//This channel was disabled already
}
pwmout_enable_pins(obj, false);
if(pwmout_all_inactive()) {
//Stop timer
PWM_TIMER->CMD = TIMER_CMD_STOP;
while(PWM_TIMER->STATUS & TIMER_STATUS_RUNNING);
//Disable clock
CMU_ClockEnable(PWM_TIMER_CLOCK, false);
}
}
/*
*Function name: DMA_CallBack()
*Description : Call back function of the DMA
*/
void DMA_CallBack(unsigned int channel, bool primary, void *user)
{
unblockSleepMode(EM1);
blockSleepMode(EM2);
if(!trfComplete)
{
ADC_Reset(ADC0); // Reset the ADC; Turn it off
//ADC0->CMD = ADC_CMD_SINGLESTOP;
int temp = 0, i = 0;
char tempChar[7]; //To store the temperature in char, for transmitting
char temp_string[TX_bufferSize];
(void) channel;
(void) primary;
(void) user;
for (i = 0; i < ADC_SAMPLES; i++)
{
temp += (ADC_Buffer[i]);
}
temperature = temp / ADC_SAMPLES;
temperature = convertToCelsius(temperature); //Get value of Temperature in deg C
if (temperature > HIGHTEMP)
{
//GPIO_PinOutClear(gpioPortE,2);
//GPIO_PinOutSet(gpioPortE,3);
/* To extract the digits of the temperature variable and put in tempChar. A basic digit extraction algorithm is used and then each digit is passed one by one. */
temp = temperature*10;
tempChar[0] = (temp/100)+48;
temp = temp%100;
tempChar[1] = (temp/10)+48;
temp = temp%10;
tempChar[2] = '.';
tempChar[3] = (temp)+48;
tempChar[4] = 'C'; // Pad the 4th position of charTemp as C
tempChar[5] = '\r'; // Pad carriage return
tempChar[6] = '\n'; // Pad line feed
strcpy(temp_string,HighTemp); // Copy the HighTemp message in the temporary string
strcat(temp_string,tempChar); // Concatenate with the tempChar to get the final message
LEUART0->CTRL |= LEUART_CTRL_TXDMAWU; // Enable DMA wake up for LEUART TX in EM2
// Activate DMA transfers for LEUART TX
DMA_ActivateBasic(DMA_CHANNEL_TX, true, false, (void *)&(LEUART0->TXDATA), (void *)temp_string, strlen(temp_string) - 1);
}
else if (temperature < LOWTEMP)
{
//GPIO_PinOutSet(gpioPortE,2);
//GPIO_PinOutClear(gpioPortE,3);
temp = temperature*10;
tempChar[0] = (temp/100)+48;
temp = temp%100;
tempChar[1] = (temp/10)+48;
temp = temp%10;
tempChar[2] = '.';
tempChar[3] = (temp)+48;
tempChar[4] = 'C';
tempChar[5] = '\r';
tempChar[6] = '\n';
strcpy(temp_string,LowTemp); // Copy the LowTemp message in the temporary string
strcat(temp_string,tempChar); // Concatenate with the tempChar to get the final message
LEUART0->CTRL |= LEUART_CTRL_TXDMAWU; // Enable DMA wake up for LEUART TX in EM2
// Activate DMA transfers for LEUART TX
DMA_ActivateBasic(DMA_CHANNEL_TX, true, false, (void *)&(LEUART0->TXDATA), (void *)temp_string, strlen(temp_string) -1);
}
trfComplete=true;
}
else
{
(void) channel;
(void) primary;
(void) user;
// Disable DMA wake-up from LEUART1 TX
LEUART0->CTRL &= ~LEUART_CTRL_TXDMAWU;
}
}
