Topic : SPI problems in Slave Software mode operation.

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March 3, 2010 - 11:33am Guest	Hi, my SPI code for parity bit control work well, but if let alone. If I add Lart, LT, ADC and all what I need, it dont work as it must be: ST7lite39 on REva 2.10 dont response ACK (0x06) or NACK (0x15) but repeat the input MOSI byte... it seems to be unwrittable the SPIDR register in that moment, because if I defeat SPI_PutByte nothing change... Quote: SPI_Init(SPI_BAUDRATE_128\|SPI_ENABLE_IT\|SPI_ENABLE, SPI_SLAVE_SW); Polarity = 0 Phase = 1 SPI reception in Interrupt Mode SPI transmission in Polling Mode CODE wrote: INT_ROUTINE(SPI_IT_Routine, SPI_IRQ_ID) { int i = 0, j = 0; unsigned char ASCII_parity[2] = { 0x06 , 0x15 }, temp; DisableInterrupts; SPI_IT_Function(); while(!SPI_IsReceptionCompleted()) ; SPIByte = SPI_GetByte(); temp = SPIByte; IO_Write( IO_PORT_A , IO_PIN_0, IO_DATA_TOGGLE ); // HERE THERE IS THE PARITY CHECK FUNCTION SPI_PutByte( ASCII_parity[ j & 0x01 ] ); //PutByte 0x06 ACK if bit are OK or 0x15 NACK if bit arent OK while(!SPI_IsTransmitCompleted()) ; SPI_Clear_Flags(); EnableInterrupts; } Results right wrote: >spi swap 42 (00101010) received : spi in 0 (right: first value is 0) >spi swap 43 (00101011) received : spi in 21 (0x15 NACK for 00101010) >spi swap 43 (00101011) received : spi in 6 (0x06 ACK for 00101011) Results wrong wrote: >spi swap 42 received : spi in 0 (right: first value is 0) >spi swap 43 received : spi in 42 >spi swap 43 received : spi in 43 What could I control? Any idea? Thx.

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+1 0 -1 March 3, 2010 - 4:12pm Guest	Hi, for your knowledge: it work with Master and Slave with SPI_Phase at 1. If you use SPI_Phase at 0 you could have problems. I only had to give (SPI phase 1) by Into PeriphInit wrote: SPI_Init(SPI_BAUDRATE_128\|SPI_ENABLE_IT\|SPI_ENABLE, SPI_SLAVE_SW); SPICR = SPICR \| 0x04; How could I use "CLK_PP_Value - Selects the clock polarity and clock phase" in it? Program dislike it's use. Thanks
+1 0 -1 March 5, 2010 - 11:04am Raisonance Support Team	Hello Chiesa, This problem looks very much processor-related, and we will only be helpful concerning development tools. I suggest that you turn to the ST support people in order to get help specific to your problem. Regards, Bruno
+1 0 -1 April 22, 2010 - 5:00pm Guest	GremlinC5 wrote: Hi I have some other problems using the SPI with buffer and interrupt. When I have an interrupt, how could I use functions in the routine to fullfill the buffer, this mine code do nothing: Quote: INT_ROUTINE(SPI_IT_Routine, SPI_IRQ_ID){ unsigned char buffer[SPI_BUFFER] = {.............}; DisableInterrupts; SPI_IT_Function(); SPI_GetBuffer( &buffer[0], SPI_HEADER ) ; while(!SPI_IsReceptionCompleted()) ; if(buffer[2] <= SPI_PAYLOAD_MAX) { //dont go out of bound!!! SPI_GetBuffer( &buffer[0]+SPI_HEADER, buffer[2]); while(!SPI_IsReceptionCompleted()) ; } SPI_Clear_Flags(); EnableInterrupts; } I could use SPI_GetByte but I couldnt use SPI_GetBuffer at yet. Quote: /----------------------------------------------------------------------------- ROUTINE NAME : SPI_GetBuffer INPUT 1 : PtrToBuffer - Starting address of the user buffer INPUT 2 : NbOfBytes - Number of data bytes to be received OUTPUT : None DESCRIPTION : In interrupt driven mode, starts data bytes reception in ISR COMMENTS : None -----------------------------------------------------------------------------/ Do I must init buffer in main with SPI_GetBuffer? To init Global Variables in Spi.c? /----------------------------------------------------------------------------- ROUTINE NAME : SPI_IT_Function INPUT : None OUTPUT : None DESCRIPTION : Data transmission and reception takes place in interrupt subroutine for Interrupt driven without buffer mode. COMMENTS : None -----------------------------------------------------------------------------*/ And use in the ISR the function SPI_IT_Function? That automatically fill data in the buffer? Please I'll become crazy :/ Thank you.
+1 0 -1 April 26, 2010 - 10:26am Guest	Hi, what I could understand is that I must know before how many byte my cpu is receiving and pass a initialize "SPI_GetBuffer" to initialize the buffer reception. After in the ISR of SPI I must use "SPI_IT_Function" to capture data input to the buffer (rx or tx as needed). Is it right? my code doesnt work for: wrote: if (!(SPI_Err)) "with SPI_Err == 0x80" The problem was removed writing a FlagClean function as first function in the SPI ISR to clean the interrupt bit in the register. I'm modifying your SPI IT function to achieve my desired protocol... ;) Thanks.