/**
* @brief This function handles DMA channel interrupt request.- PPG adc data ISR
* @param None
* @retval None
*/
__attribute__((externally_visible)) void DMAChannel1_IRQHandler(void) {
static uint8_t decimation_counter;
if(DMA_GetITStatus(DMA1_IT_HT1)) {
DMA_ClearITPendingBit(DMA1_IT_GL1); //clear all the interrupts
if(Sensors&PPG_SENSORS) //PPG enabled
PPG_LO_Filter(ADC1_Convertion_buff); //Process lower half
}
else if (DMA_GetITStatus(DMA1_IT_TC1)) {
DMA_ClearITPendingBit(DMA1_IT_GL1); //clear all the interrupts
if(Sensors&PPG_SENSORS) //PPG enabled
PPG_LO_Filter(&ADC1_Convertion_buff[ADC_BUFF_SIZE/4]);//Transfer complete, process upper half - indexed as 16bit words
}
DMA_ClearFlag(DMA1_FLAG_TC1|DMA1_FLAG_HT1); //make sure flags are clear
//Now we process other sensor data - we do this here so as to have all the sensors syncronised with the PPG data
if(++decimation_counter==PPG_NO_SUBSAMPLES) { //Each time this is true we will have output some PPG samples
decimation_counter=0; //Reset this here
//Now process each sensor
if(Sensors&(1<<PRESSURE_HOSE)) //Only pass data once hose is connected
Add_To_Buffer(*(uint32_t*)(&Reported_Pressure),&Pressures_Buffer);//Pass pressure data via buffer to avoid issues with lag
if(Sensors&(1<<TEMPERATURE_SENSOR)) //Only pass data is I2C temp sensor is connected
Add_To_Buffer(*(uint32_t*)(&TMP102_Reported_Temperature),&Temperatures_Buffer);//Pass press data via buffer avoiding lag issue
if(Sensors&(1<<THERMISTOR_SENSOR)) //Only pass data is I2C temp sensor is connected
Add_To_Buffer(*(uint32_t*)(&Device_Temperature),&Thermistor_Buffer);//Pass press data via buffer avoiding lag issue
//More sensors can be added here
}
}
/**
* @brief Loads the data from the raw I2C driver into the data buffers as 16 bit integers
* @param uint8_t state: takes values 0 or 1 to toggle between sparkfun sensor units
* @retval None
*/
void Fill_Sample_Buffers(uint8_t state) { //State should be zero or one to use the two sparkfun sensor buffers
for(uint8_t n=0;n<3;n++) {
Add_To_Buffer(*(uint16_t*)&(Rawdata[1+4*state][2*n]), &(sfe_sensor_buffers[state].accel[n]));
Add_To_Buffer(Flipedbytes(*(uint16_t*)&(Rawdata[2+4*state][2*n])),&(sfe_sensor_buffers[state].magno[n]));
Add_To_Buffer(Flipedbytes(*(uint16_t*)&(Rawdata[3+4*state][2*n+2])),&(sfe_sensor_buffers[state].gyro[n]));//+2 as we skip the temperature
}
Add_To_Buffer(Flipedbytes(*(uint16_t*)&(Rawdata[3+4*state][0])),&(sfe_sensor_buffers[state].temp));//the temperature from the itg3200
//Add the LSM330 temperature sensor (this is only 8 bit output) - other LSM330 sensor data is added directly from callbacks
if(!state)
Add_To_Buffer((uint16_t)Rawdata[4][0],&(forehead_buffer.temp));
}
/**
* @brief This function generates a device to base station packet, uses a reverse COBS format that requires working backwards from end of packet
* @param Pointer to output buffer, pointer to input data, number of data bytes, device ID on the network, pointer to sequence number (iterates)
* @retval None
*/
void RN42_generate_packet(uint8_t* data_payload, uint8_t number_bytes, uint8_t device_network_id, uint8_t* sequence_number) {
const uint8_t header=HEAD;
Add_To_Buffer(&header,&Usart1_tx_buff);
Add_To_Buffer(&device_network_id,&Usart1_tx_buff);//Packet header consists of device network id byte and sequence number (for scrolling graph smoothness)
Add_To_Buffer(sequence_number,&Usart1_tx_buff);//This is similar to HDLC packet format
uint8_t skip=1;
for(uint8_t n=0; n<number_bytes; n++) {
if(data_payload[n]==HEAD) {
__usart_send_char(skip); //The send_char routine is used here as it will kick start the interrupt driven usart comms if needs be
skip=1;
}
else {
skip++;
__usart_send_char(data_payload[n]);
}
}
__usart_send_char(skip); //Work backwards from the end of the packet, skipping skip bytes and replacing with HEAD until packet header
*sequence_number++; //Incriment this
}
