RA0 SPI without interrupt

Question

Hello everyone 
 
 I'm using a Renesas RA0 microcontroller. I would like to know if there is some example code showing how to use the SAU peripheral for SPI WITHOUT using interrupt. I use the SPI for both receiving and transmitting data in Master Mode. 
 
 Thanks in advance, 
 Br 
 Davide Petralia

DAV_94 · Answer

Good morning, at the end we were able to implement the SPI WITHOUT using interrupt. Here below a code example. Besides I noted that the code works if I the register R_SAU0 and not if I use g_spi0_ctrl. p_reg -> SD R. After I gave a look at the code it seems that p_reg is never initialized _STATIC_INLINE_ uint16_t SPISendReceiveNOCallback( void ) { DisableInterrupt( ); uint32_t spiTimeout = UINT16_MAX; uint16_t receivedData = 0; /* Assert Slave select pin to start data transfer */ CSAssert( ); /* Write/Read data to/from ASIC */ for ( uint8_t i = 0; i < SPI_NUM_BYTES; ++i ) { /* Set the data and reset the timeout */ spiTimeout = UINT16_MAX; R_SAU0->SDR[g_spi0_ctrl.p_cfg->channel] = spiTx[i]; while ( R_SAU0->SSR_b[g_spi0_ctrl.p_cfg->channel].TSF != 0 ) { --spiTimeout; if ( 0 == spiTimeout ) { assert( false ); } } /* Check for overflow error */ uint16_t err_type = R_SAU0->SSR[g_spi0_ctrl.p_cfg->channel] & R_SAU0_SSR_OVF_Msk; if ( err_type != 0 ) { R_SAU0->SIR[g_spi0_ctrl.p_cfg->channel] = err_type; } else { /* Read data */ spiRx[i] = ( uint8_t )( R_SAU0->SDR[g_spi0_ctrl.p_cfg->channel] & UINT8_MAX ); } } /* De-assert Slave select pin to stop data transfer */ CSDeassert( ); EnableInterrupt( ); receivedData = ( uint16_t )( ( spiRx[0] << SHIFT_HIGH_BYTE ) | ( spiRx[1] ) ); return receivedData; }

NP_Renesas · Answer

Hi DAV_94, 
 
 I think the official SAU_SPI sample project can fit your requirement, although it use the interrupt of SPI but in the interrupt it just read the status of SPI and not handling any data in IRQ. 
 ra-fsp-examples/example_projects/fpb_ra0e1/sau_spi/sau_spi_fpb_ra0e1_ep at v5.3.0.example.3 &middot; renesas/ra-fsp-examples (github.com) 
 
 BR, 
 NP_Renesas

RA0 SPI without interrupt

Top Replies