Hi,
I'm trying to read the input from an SPI interface trough GPDMA to the memory of an XMC4800.
In detail:
With a high PWM interrupt frequency (PWM > 750kHz) I'm sampling the SPI interface.
On every interrupt when the frame length of the SPI input is reached (18bit), I want to shift the SPI FIFO to the memory over the GPDMA.
In the attachment file there are some details about the protocol:
Channel 0: PWM Interrupt pin --> ADC starts convertsation at high edge
Channel 1: MOSI
Channel 2: CLK (about 72MHz)
Channel 3; MISO --> Data from ADC 18bit
Attachment 3033
How do I achieve this?
Some GPDMA example for Dave 4 (peripheral to peripheral , memory to peripheral and vice versa) would help alot.
Code at the moment without PGDMA:
Thanks
Patrick
I'm trying to read the input from an SPI interface trough GPDMA to the memory of an XMC4800.
In detail:
With a high PWM interrupt frequency (PWM > 750kHz) I'm sampling the SPI interface.
On every interrupt when the frame length of the SPI input is reached (18bit), I want to shift the SPI FIFO to the memory over the GPDMA.
In the attachment file there are some details about the protocol:
Channel 0: PWM Interrupt pin --> ADC starts convertsation at high edge
Channel 1: MOSI
Channel 2: CLK (about 72MHz)
Channel 3; MISO --> Data from ADC 18bit
Attachment 3033
How do I achieve this?
Some GPDMA example for Dave 4 (peripheral to peripheral , memory to peripheral and vice versa) would help alot.
Code at the moment without PGDMA:
Code:
#include <DAVE.h> //Declarations from DAVE Code Generation (includes SFR declaration)
#include <stdio.h>
uint16_t j = 0;
uint16_t data[2048];
uinbt32_t dataArray[1024];
bool test = false;
void compare_match_handler(void)
{
//empty = (uint16_t)SPI_MASTER_0.channel->OUTR;
//empty = (uint32_t)SPI_MASTER_0.channel->OUTR;
//SPI_MASTER_0.channel->IN[0] = 0xFFFF; // 32 Bit
//SPI_MASTER_0.channel->IN[0] = 0xFFFF;
SPI_MASTER_0.channel->IN[0] = 0x3FF; // 10 Bit --> to get all 18 bits correct
SPI_MASTER_0.channel->IN[0] = 0x3FF;
//SPI_MASTER_0.channel->IN[0] = 0x1FF; // 9 Bit
//SPI_MASTER_0.channel->IN[0] = 0x1FF;
while(XMC_USIC_CH_RXFIFO_GetLevel(SPI_MASTER_0.channel) < 2);
data[j++] = (uint16_t)SPI_MASTER_0.channel->OUTR;
data[j++] = (uint16_t)SPI_MASTER_0.channel->OUTR;
}
int main(void)
{
DAVE_STATUS_t status;
status = DAVE_Init(); /* Initialization of DAVE APPs */
if(status != DAVE_STATUS_SUCCESS)
{
/* Placeholder for error handler code. The while loop below can be replaced with an user error handler. */
XMC_DEBUG("DAVE APPs initialization failed\n");
while(1U)
{
}
}
PWM_Start(&PWM_0);
/* Placeholder for user application code. The while loop below can be replaced with user application code. */
while(1U)
{
if(j > 1024 && test == fale)
{
PWM_Stop(&PWM_0);
// Get 18 bit ADC values
for(uint32_t i = 0; i < sizeof(data); i += 2)
{
//dataArray[i] = (uint32_t)((data[i] << 17) | (data[i + 1] << 7));
data[i] &= ~(1 << 9);
dataArray[i] = (uint32_t)((data[i] << 10) | (data[i + 1] << 1));
}
test = true;
}
}
}Patrick