Could you please write in clear manner, step by step, as it was done for LPC17xx User manual, what is the sequence which describes how one should process a data transfer with the LPSPIx i.MXRT1170 when it is set up to be the master.
I just want to remember how it was done for the LPC17xx on p.404:
" This process assumes that any prior data transfer has already completed.
1. Optionally, verify the SPI setup before starting the transfer.
2. Write the data to transmitted to the SPI Data Register. This write starts the SPI data
transfer.
3. Wait for the SPIF bit in the SPI Status Register to be set to 1. The SPIF bit will be set
after the last cycle of the SPI data transfer.
4. Read the SPI Status Register.
5. Read the received data from the SPI Data Register (optional).
6. Go to step 2 if more data is to be transmitted.
Note: A read or write of the SPI Data Register is required in order to clear the SPIF status
bit. Therefore, if the optional read of the SPI Data Register does not take place, a write to
this register is required in order to clear the SPIF status bit."
So resulting code may looks like that:
/* Send one byte then recv one byte of response. */
static uint8_t LPC17xx_SPI_SendRecvByte (uint8_t byte_s)
{
uint8_t byte_r;
LPC_SSP0->DR = byte_s;
while (LPC_SSP0->SR & (1 << SSPSR_BSY) /*BSY*/); /* Wait for transfer to finish */
byte_r = LPC_SSP0->DR;
return byte_r; /* Return received value */
}
From you awful Reference Manual for the i.MXRT1170 it's hard to understand something useful. Moreover, in the SDK examples doesn't exits any useful example for real SPI IC to be able to understand how to really program LPSPI and control
