Part Number: CC1310
Tool/software: TI-RTOS
Hi,
I am using the SPI driver since the beggining of my project to communicate with a external flash memory.
Everything was good until I reach a point where I need to do things very fast.
The SPI communication wasn't working fast enough, so I started investigating why.
I discovered that the bottlenack of the speed was the number of transactions made.
I was reading/writing one byte at a time (function below). So, to write a whole memory page (4096 bytes) I was doing 4096 transactions.
uint8_t spi_send_receive_8bits(SPI_Handle * spiHandle, uint8_t aByte)
{
uint8_t rxByte;
uint8_t txByte;
SPI_Transaction spiTransaction;
txByte = aByte;
spiTransaction.count = 1;
spiTransaction.rxBuf = &rxByte;
spiTransaction.txBuf = &txByte;
SPI_transfer(*spiHandle,&spiTransaction);
return rxByte;
}
I re-write it to read/write 64 bytes at a time. It reduced drastically the time need to read/write the same 4096 bytes. Now I am doing 64 transactions instead of 4096 transactions.
But I need to do it even faster.
My question is: both buffers must be the same size?
I have a rxBuffer that have 4096 bytes.
To read one byte from the external memory I need to send a dummy byte.
I would like to do something like that:
void spi_read_buffer(SPI_Handle * spiHandle, uint8_t * rxBuffer, uint16_t size)
{
SPI_Transaction spiTransaction;
uint8_t dummyByte = 0x00;
spiTransaction.count = size;
spiTransaction.rxBuf = rxBuffer;
spiTransaction.txBuf = &dummyByte;
SPI_transfer(*spiHandle, &spiTransaction);
}
Using the same logic, I would like to write a n bytes txBuffer without caring about the returning bytes.
The problem of having two buffers with same size is that I will need to create a second buffer with 4096 bytes. I don't have RAM or FLASH available to do that.
Is there any way do achieve what I would like to do?
Thank you!
