I am trying to read CAN bus from my car (my car use 95Kbps can speed).
I use this library Link. To add custom CAN baud rate, added this
typedef enum {
CAN_SPEED_100KBPS = 100, /**< \brief CAN Node runs at 100kBit/s. */
CAN_SPEED_125KBPS = 125, /**< \brief CAN Node runs at 125kBit/s. */
CAN_SPEED_200KBPS = 200, /**< \brief CAN Node runs at 250kBit/s. */
CAN_SPEED_250KBPS = 250, /**< \brief CAN Node runs at 250kBit/s. */
CAN_SPEED_500KBPS = 500, /**< \brief CAN Node runs at 500kBit/s. */
CAN_SPEED_800KBPS = 800, /**< \brief CAN Node runs at 800kBit/s. */
CAN_SPEED_1000KBPS = 1000 /**< \brief CAN Node runs at 1000kBit/s. */
CAN_SPEED_95KBPS = 95 /**< \brief CAN Node runs at 95kBit/s. */ //This string I added
} CAN_speed_t;
And I use esp32can_basic.ino with two modifications
Set speed
CAN_cfg.speed = CAN_SPEED_95KBPS;
Delete writing
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
CAN_frame_t tx_frame;
tx_frame.FIR.B.FF = CAN_frame_std;
tx_frame.MsgID = 0x001;
tx_frame.FIR.B.DLC = 8;
tx_frame.data.u8[0] = 0x00;
tx_frame.data.u8[1] = 0x01;
tx_frame.data.u8[2] = 0x02;
tx_frame.data.u8[3] = 0x03;
tx_frame.data.u8[4] = 0x04;
tx_frame.data.u8[5] = 0x05;
tx_frame.data.u8[6] = 0x06;
tx_frame.data.u8[7] = 0x07;
ESP32Can.CANWriteFrame(&tx_frame);
But nothing work :(
My hardware is ESP32-PICO-D4 and SN65HVD230 CAN Board. What have I done wrong?
UPD1 in CAN.c in int CAN_init() there are this strings
switch (CAN_cfg.speed) {
case CAN_SPEED_1000KBPS:
MODULE_CAN->BTR1.B.TSEG1 = 0x4;
__tq = 0.125;
break;
case CAN_SPEED_800KBPS:
MODULE_CAN->BTR1.B.TSEG1 = 0x6;
__tq = 0.125;
break;
case CAN_SPEED_200KBPS:
MODULE_CAN->BTR1.B.TSEG1 = 0xc;
MODULE_CAN->BTR1.B.TSEG2 = 0x5;
__tq = 0.25;
break;
default:
MODULE_CAN->BTR1.B.TSEG1 = 0xc;
__tq = ((float) 1000 / CAN_cfg.speed) / 16;
}
I think this code calculate tq.
"Nothing work" - no CAN codes read. I think I set wrong baud rate.
TQ (Time Quanta) is like the Sampling rate at which this SP is taken, which is also between TSEG1 and TSEG2 First and second Segment.
You need to calculate this values (check here) for more infor and a calculator
Related
Hello I am using STM32H753 over a custom PCB.
I have no any CAN Analyzer except oscilloscope, multimeter and logic analyzer.
We have a problem with CAN BUS communication.
I am suspecting of CAN Tranceiver but we couldn't find the root cause yet.
There are external and internal loopback modes in STM32H7 to test CAN, However these modes also allow us to see the messages what we sent on CAN TX.
I have two different product which has different STM32H753 variant. One is working and the other one is not. Their tranceivers are different but almost same pinout and behavior.
My assumption was if I see my messages on CAN TX then I have to see them CAN H and CAN L.
I wrote test code.
I tried both test code in both device.
On working one, I saw messages on CAN Tx and also see messages with in a suppress way which I thought because of no termination resistor at the end.
On the not-working one, I also saw messages at CAN TX and there is no any move at CAN H or CAN L.
My question is my test was is true or still I could miss something or this test does not imply anyhting ?
HAL_Delay(100);
if(HAL_FDCAN_AddMessageToTxBuffer(&hfdcan1, &TxHeader, TxData_Node1_To_Node2, FDCAN_TX_BUFFER0 ) != HAL_OK)
{
Error_Handler();
}
/* Send Tx buffer message */
if(HAL_FDCAN_EnableTxBufferRequest(&hfdcan1, FDCAN_TX_BUFFER0) != HAL_OK)
{
Error_Handler();
}
while(HAL_FDCAN_IsTxBufferMessagePending(&hfdcan1, FDCAN_TX_BUFFER0) == 1);
/* Polling for reception complete on buffer index 0 */
while(HAL_FDCAN_IsRxBufferMessageAvailable(&hfdcan1, FDCAN_RX_BUFFER0) == 0);
/* Retrieve message from Rx buffer 0. Rec msg from Node 2 */
if(HAL_FDCAN_GetRxMessage(&hfdcan1, FDCAN_RX_BUFFER0, &RxHeader, RxData_From_Node2) != HAL_OK)
{
Error_Handler();
}
hfdcan1.Instance = FDCAN1;
hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
hfdcan1.Init.Mode = FDCAN_MODE_EXTERNAL_LOOPBACK;
hfdcan1.Init.AutoRetransmission = DISABLE;
hfdcan1.Init.TransmitPause = DISABLE;
hfdcan1.Init.ProtocolException = DISABLE;
hfdcan1.Init.NominalPrescaler = 1;
hfdcan1.Init.NominalSyncJumpWidth = 13;
hfdcan1.Init.NominalTimeSeg1 = 86;
hfdcan1.Init.NominalTimeSeg2 = 13;
hfdcan1.Init.DataPrescaler = 2;
hfdcan1.Init.DataSyncJumpWidth = 12;
hfdcan1.Init.DataTimeSeg1 = 12;
hfdcan1.Init.DataTimeSeg2 = 12;
hfdcan1.Init.MessageRAMOffset = 0;
hfdcan1.Init.StdFiltersNbr = 1;
hfdcan1.Init.ExtFiltersNbr = 0 ;
hfdcan1.Init.RxFifo0ElmtsNbr = 0;
hfdcan1.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.RxFifo1ElmtsNbr = 0;
hfdcan1.Init.RxFifo1ElmtSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.RxBuffersNbr = 1;
hfdcan1.Init.RxBufferSize = FDCAN_DATA_BYTES_8;
hfdcan1.Init.TxEventsNbr = 0;
hfdcan1.Init.TxBuffersNbr = 1;
hfdcan1.Init.TxFifoQueueElmtsNbr = 32;
hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
if (HAL_FDCAN_Init(&hfdcan1) != HAL_OK)
{
Error_Handler();
}
I am trying to read data from channel 0,1,2 and 3 of ADC1. The issue is that when I read from channel 1 and channel 2 and run the code in debug mode it shows the correct valueenter image description heres but when I modified it for doing the same for channel 3 and 4 also,it does not show any value.Following is the code and the screen shot of memory map:
#include "stm32f4xx.h"
#include "stm32f4_discovery.h"
uint16_t ADC1ConvertedValue[4] = {0,0,0,0};//Stores converted vals [2] = {0,0}
void DMA_config()
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 ,ENABLE);
DMA_InitTypeDef DMA_InitStruct;
DMA_InitStruct.DMA_Channel = DMA_Channel_0;
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t) 0x4001204C;//ADC1's data register
DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStruct.DMA_BufferSize = 4;//2
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//Reads 16 bit values _HalfWord
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//Stores 16 bit values _Halfword
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Enable;
DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;//_HalfFull
DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStruct);
DMA_Cmd(DMA2_Stream0, ENABLE);
}
void ADC_config()
{
/* Configure GPIO pins ******************************************************/
ADC_InitTypeDef ADC_InitStruct;
ADC_CommonInitTypeDef ADC_CommonInitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);//ADC1 is connected to the APB2 peripheral bus
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;// PA0,PA1,PA3,PA3
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;//The pins are configured in analog mode
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;//We don't need any pull up or pull down
GPIO_Init(GPIOA, &GPIO_InitStruct);//Initialize GPIOA pins with the configuration
/* ADC Common Init **********************************************************/
ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStruct);
/* ADC1 Init ****************************************************************/
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;//Input voltage is converted into a 12bit int (max 4095)
ADC_InitStruct.ADC_ScanConvMode = ENABLE;//The scan is configured in multiple channels
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;//Continuous conversion: input signal is sampled more than once
ADC_InitStruct.ADC_ExternalTrigConv = DISABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;//Data converted will be shifted to right
ADC_InitStruct.ADC_NbrOfConversion = 4;
ADC_Init(ADC1, &ADC_InitStruct);//Initialize ADC with the configuration
/* Select the channels to be read from **************************************/
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_144Cycles);//PA0
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_144Cycles);//PA1
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_144Cycles);//PA2
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_144Cycles);//PA3
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
}
int main(void)
{
DMA_config();
ADC_config();
while(1)
{
ADC_SoftwareStartConv(ADC1);
//value=ADC_Read();
}
return 0;
}
You shouldn't start the ADC conversion multiple times (in your while(1) loop).
Since you've configured the ADC with .ADC_ContinuousConvMode = ENABLE it should be enough to start it before the loop and do nothing within it.
I wrote a CAPl code, where it has to send the CAN frames to control the stepper motor step. stepper motor used is TMCM-1311 module.
variables{
message step myMsg1;
message llmmodule myMsg2;
message llmmodule myMg3;
}
on start{
int i=0;
for (i=0:;i<=5000:i++)
{
myMsg1.DLC = 8;
myMsg1.byte(0) = 0x04;
myMsg1.byte(1) = 0x01;
myMsg1.byte(2) = 0x00;
myMsg1.byte(3) = 0x00;
myMsg1.byte(4) = 0x00;
myMsg1.byte(5) = 0x00;
myMsg1.byte(6) = 0x0A;
myMsg1.byte(7) = 0x00;
output(mymsg1);
myMsg2.DLC = 8;
myMsg2.byte(0) = 0x07;
myMsg2.byte(1) = 0x01;
myMsg2.byte(2) = 0x03;
myMsg2.byte(3) = 0x11;
output(mymsg2);
myMsg3.DLC = 8;
myMsg3.byte(0) = 0x07;
myMsg3.byte(1) = 0x03;
myMsg3.byte(2) = 0x01;
myMsg3.byte(3) = 0x00;
output(mymsg3);
}
}
In the for loop of the above code, the CAN frame is continuously sent without waiting for the ACK, the 1st data frame i.e., myMsg1 is sent for rotating the stepper motor to certain step size, so once that frame is sent it takes some time for the stpper motor to rotate to that position, once it is at that position then the other 2 CAN frames i.e., myMsg2 and myMsg3 should be sent. After the ACK recieved for all the 3 data frames sent then i in the for loop should increment and the next iteration should take place. But in the above code the for loop is executing without waiting for the ACK from the CAN frame, so i think timer should be used there to give a delay and to execute the next iterations after the ACK is received. I tried using timers but i could not find a solution as required, so it would be great help if anyone can let me know how it should be executed.
You have to use the on message event for this use case.
variables
{
message step myMsg1;
message llmmodule myMsg2;
message llmmodule myMg3;
}
on start
{
myMsg1.DLC = 8;
myMsg1.byte(0) = 0x04;
myMsg1.byte(1) = 0x01;
myMsg1.byte(2) = 0x00;
myMsg1.byte(3) = 0x00;
myMsg1.byte(4) = 0x00;
myMsg1.byte(5) = 0x00;
myMsg1.byte(6) = 0x0A;
myMsg1.byte(7) = 0x00;
myMsg2.DLC = 8;
myMsg2.byte(0) = 0x07;
myMsg2.byte(1) = 0x01;
myMsg2.byte(2) = 0x03;
myMsg2.byte(3) = 0x11;
myMsg3.DLC = 8;
myMsg3.byte(0) = 0x07;
myMsg3.byte(1) = 0x03;
myMsg3.byte(2) = 0x01;
myMsg3.byte(3) = 0x00;
output(mymsg1);
}
on message ACK_Msg1
{
output(mymsg2);
}
on message ACK_Msg2
{
output(mymsg3);
}
on message ACK_Msg3
{
output(mymsg1);
}
This code will go on until the ack messages stop. So, if you want to do this for a definite amount of times, you might have to use some kind of flags in every event.
I measure distance using ultrasonic signal. STM32F1 generate Ultrasound signal, STM32F4 writing this signal using microphone. Both STM32 are synchronized using signal generated another device, they connected one wire.
Question: Why signal comes with different times? although I don’t move receiver or transmitter. It's gives errors 50mm.
Dispersion signals
Code of receiver is here:
while (1)
{
if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_5) != 0x00)
{
Get_UZ_Signal(uz_signal);
Send_Signal(uz_signal);
}
}
void Get_UZ_Signal(uint16_t* uz_signal)
{
int i,j;
uint16_t uz_buf[10];
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&uz_buf, 300000);
for(i = 0; i<lenght_signal; i++)
{
j=10;
while(j>0)
{
j--;
}
uz_signal[i] = uz_buf[0];
}
HAL_ADC_Stop_DMA(&hadc1);
}
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
More information here:
https://github.com/BooSooV/Indoor-Ultrasonic-Positioning-System/tree/master/Studying_ultrasonic_signals/Measured_lengths_dispersion
PROBLEM RESOLVED
Dispersion signals final
The time errors was created by the transmitter, I make some changed in it. Now synchro signal takes with help EXTI, and PWM generated all time, and I controlee signal with Enable or Disable pin on driver. Now I have dispersion 5mm, it enough for me.
Final programs is here
https://github.com/BooSooV/Indoor-Ultrasonic-Positioning-System/tree/master/Studying_ultrasonic_signals/Measured_lengths_dispersion
Maybe, It is a problem of time processing. The speed of sound is 343 meters / sec. Then, 50mm is about 0.15 msec.
Have you thought to call HAL_ADC_Start_DMA() from the main()
uint16_t uz_buf[10];
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&uz_buf, 10 );//300000);
// Sizeof Buffer ---------------------^
and you call
void Get_UZ_Signal(uint16_t* uz_signal) {
int i;
// For debugging - Get the time to process
// Get the Time from the System Tick. This counter wrap around
// from 0 to SysTick->LOAD every 1 msec
int32_t startTime = SysTick->VAL;
__HAL_ADC_ENABLE(&hadc1); // Start the DMA
// return remaining data units in the current DMA Channel transfer
while(__HAL_DMA_GET_COUNTER(&hadc1) != 0)
;
for(i = 0; i<lenght_signal; i++) {
// uz_signal[i] = uz_buf[0];
// 0 or i ------------^
uz_signal[i] = uz_buf[i];
__HAL_ADC_DISABLE(&hadc1); // Stop the DMA
int32_t endTime = SysTick->VAL;
// check if negative, case of wrap around
int32_t difTime = endTime - startTime;
if ( difTime < 0 )
difTime += SysTick->LOAD
__HAL_DMA_SET_COUNTER(&hadc1, 10); // Reset the counter
// If the DMA buffer is 10, the COUNTER will start at 10
// and decrement
// Ref. Manual: 9.4.4 DMA channel x number of data register (DMA_CNDTRx)
In your code
MX_USART1_UART_Init();
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&uz_signal, 30000);
// Must be stopped because is running now
// How long is the buffer: uint16_t uz_signal[ 30000 ] ?
__HAL_ADC_DISABLE(&hadc1); // must be disable
// reset the counter
__HAL_DMA_SET_COUNTER(&hdma_adc1, 30000);
while (1)
{
if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_5) != 0x00)
{
__HAL_ADC_ENABLE(&hadc1);
while(__HAL_DMA_GET_COUNTER(&hdma_adc1) != 0)
;
__HAL_ADC_DISABLE(&hadc1);
__HAL_DMA_SET_COUNTER(&hdma_adc1, 30000);
// 30,000 is the sizeof your buffer?
...
}
}
I made some test with uC STM32F407 # 168mHz. I'll show you the code below.
The speed of sound is 343 meters / second.
During the test, I calculated the time to process the ADC conversion. Each conversion takes about 0.35 uSec (60 ticks).
Result
Size Corresponding
Array Time Distance
100 0.041ms 14mm
1600 0.571ms 196mm
10000 3.57ms 1225mm
In the code, you'll see the start time. Be careful, the SysTick is a decremental counter starting # the uC speed (168MHz = from 168000 to 0). It could be good idea to get the msec time with HAL_GetTick(), and usec with SysTick.
int main(void)
{
...
MX_DMA_Init();
MX_ADC1_Init();
// Configure the channel in the way you want
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = ADC_CHANNEL_0; //ADC1_CHANNEL;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
sConfig.Offset = 0;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
// Start the DMA channel and Stop it
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&uz_signal, sizeof( uz_signal ) / sizeof( uint16_t ));
HAL_ADC_Stop_DMA( &hadc1 );
// The SysTick is a decrement counter
// Can be use to count usec
// https://www.sciencedirect.com/topics/engineering/systick-timer
tickLoad = SysTick->LOAD;
while (1)
{
// Set the buffer to zero
for( uint32_t i=0; i < (sizeof( uz_signal ) / sizeof( uint16_t )); i++)
uz_signal[i] = 0;
// Reset the counter ready to restart
DMA2_Stream0->NDTR = (uint16_t)(sizeof( uz_signal ) / sizeof( uint16_t ));
/* Enable the Peripheral */
ADC1->CR2 |= ADC_CR2_ADON;
/* Start conversion if ADC is effectively enabled */
/* Clear regular group conversion flag and overrun flag */
ADC1->SR = ~(ADC_FLAG_EOC | ADC_FLAG_OVR);
/* Enable ADC overrun interrupt */
ADC1->CR1 |= (ADC_IT_OVR);
/* Enable ADC DMA mode */
ADC1->CR2 |= ADC_CR2_DMA;
/* Start the DMA channel */
/* Enable Common interrupts*/
DMA2_Stream0->CR |= DMA_IT_TC | DMA_IT_TE | DMA_IT_DME | DMA_IT_HT;
DMA2_Stream0->FCR |= DMA_IT_FE;
DMA2_Stream0->CR |= DMA_SxCR_EN;
//===================================================
// The DMA is ready to start
// Your if(HAL_GPIO_ReadPin( ... ) will be here
HAL_Delay( 10 );
//===================================================
// Get the time
tickStart = SysTick->VAL;
// Start the DMA
ADC1->CR2 |= (uint32_t)ADC_CR2_SWSTART;
// Wait until the conversion is completed
while( DMA2_Stream0->NDTR != 0)
;
// Get end time
tickEnd = SysTick->VAL;
/* Stop potential conversion on going, on regular and injected groups */
ADC1->CR2 &= ~ADC_CR2_ADON;
/* Disable the selected ADC DMA mode */
ADC1->CR2 &= ~ADC_CR2_DMA;
/* Disable ADC overrun interrupt */
ADC1->CR1 &= ~(ADC_IT_OVR);
// Get processing time
tickDiff = tickStart - tickEnd;
//===================================================
// Your processing will go here
HAL_Delay( 10 );
//===================================================
}
}
So, you'll have the start and end time. I think you have to make the formula on the start time.
Good luck
If you want to know the execution time, you could use that little function. It returns the micro Seconds
static uint32_t timeMicroSecDivider = 0;
extern uint32_t uwTick;
// The SysTick->LOAD matchs the uC Speed / 1000.
// If the uC clock is 80MHz, the the LOAD is 80000
// The SysTick->VAL is a decrement counter from (LOAD-1) to 0
//====================================================
uint64_t getTimeMicroSec()
{
if ( timeMicroSecDivider == 0)
{
// Number of clock by micro second
timeMicroSecDivider = SysTick->LOAD / 1000;
}
return( (uwTick * 1000) + ((SysTick->LOAD - SysTick->VAL) / timeMicroSecDivider));
}
I am using the multiple-output-device feature provided by paMME host API to output audio through multiple stereo devices. I also need to use a single multichannel input device using MME.
- When I configure just the output device and play internally generated audio, there is no problem.
- However problem starts to occur when I configure both the input device and the mulitple-stereo output devices. The application crashes when I try to use more than two channels on the output. That is, if I try to increment the 'out' pointer for more than 2*frames_per_buffer , it crashes, which indicates that buffer has been allocated only to two output channels.
Can anybody throw some light on what could be the problem. The configuration code is given below:
outputParameters.device = paUseHostApiSpecificDeviceSpecification;
outputParameters.channelCount = 8;
outputParameters.sampleFormat = paInt16;
outputParameters.hostApiSpecificStreamInfo = NULL;
wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
wmmeStreamInfo.hostApiType = paMME;
wmmeStreamInfo.version = 1;
wmmeStreamInfo.flags = paWinMmeUseMultipleDevices;
wmmeDeviceAndNumChannels[0].device = selectedDeviceIndex[0];
wmmeDeviceAndNumChannels[0].channelCount = 2;
wmmeDeviceAndNumChannels[1].device = selectedDeviceIndex[1];
wmmeDeviceAndNumChannels[1].channelCount = 2;
wmmeDeviceAndNumChannels[2].device = selectedDeviceIndex[2];
wmmeDeviceAndNumChannels[2].channelCount = 2;
wmmeDeviceAndNumChannels[3].device = selectedDeviceIndex[3];
wmmeDeviceAndNumChannels[3].channelCount = 2;
wmmeStreamInfo.devices = wmmeDeviceAndNumChannels;
wmmeStreamInfo.deviceCount = 4;
outputParameters.suggestedLatency = Pa_GetDeviceInfo( selectedDeviceIndex[0] )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
inputParameters.device = selectedInputDeviceIndex; /* default output device */
inputParameters.channelCount = 8; /* stereo output */
inputParameters.sampleFormat = paInt16; /* 32 bit floating point output */
inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
inputParameters.hostApiSpecificStreamInfo = NULL;
Thanks and regards,
Siddharth Kumar.