Re: MRF90XAM9A interfacing help
Thanks TABSoft-
The setup is I have 2 units which should be the same (I have checked pinouts on PCB but I have made many cut and re-eoutes). Both units are running same code as shown earlier;
1. Units powerup - sets registers and programming fuses
2. Setup debug stuffCode:'RF Section: 'Transmit is by fixed packet length of 3 bytes; Adress byte (2) and a Message byte. 'Packet looks like: 3-byte preamble - 3-byte Sync Word - 2-byte Address - 1-byte Message - 2-byte CRC ' |(added by pkt handler)| 'SCS' | (provided by code) | (added by pkt handler) 'Everything but the 3-byte payload is processed on receive and removed........ 'PIC is PIC18F66J11 'Using PBP3 GOLD 3.0.7.0 'Microcode Studio Plus 5.0.0.5 #CONFIG CONFIG WDTEN = OFF ; WDT NOT enabled CONFIG STVREN = ON ; Reset on stack overflow/underflow enabled CONFIG XINST = OFF ; Instruction set extension and Indexed Addressing mode disabled (Legacy mode) CONFIG DEBUG = OFF ; Background debugger disabled; RB6 and RB7 configured as general purpose I/O pins CONFIG CP0 = OFF ; Program memory is not code-protected CONFIG FOSC = INTOSC ; Internal oscillator, port function on RA6 and RA7 ; CONFIG FOSC = INTOSCPLL ; INTOSC with PLL enabled, port function on RA6 and RA7 CONFIG FCMEN = OFF ; Fail-Safe Clock Monitor disabled CONFIG IESO = OFF ; Two-Speed Start-up disabled CONFIG WDTPS = 512 ; 1:512 CONFIG CCP2MX = DEFAULT ; ECCP2/P2A is multiplexed with RC1 CONFIG MSSPMSK = MSK7 ; 7-Bit Address Masking mode enable #ENDCONFIG Asm ERRORLEVEL -306 Endasm '--------------------------------------------------------------------------------------- 'Define the oscillator, INCLUDE files, A2D setup DEFINE OSC 8 '8 MHz oscillator, internal x 4 via PLL = 32MHz include "modedefs.bas" INCLUDE "DT_INTS-18.bas" 'Base Interrupt System INCLUDE "ReEnterPBP-18.bas" 'Include if using PBP interrupts ' DEFINE RX2_INT PIR4,RC2IF,PIE4,RC2IE 'Used to ADD the 2nd serial port to the interrupt scheme '--------------------------------------------------------------------------------------- 'OKAY, Lets set up the registers..... OSCCON=%01110000 'Sleep mode when sleep instr, 8MHz, System clock is via CONFIG BITS ' OSCTUNE.6=1 'PLL ENABLED '--------------------------------------------------------------------------------------- 'Direction registers TRISA = %00001001 'Set PORTA for mixed TRISB = %11011111 'PORTB is INPUT, except for RB5 TRISC = %10010011 'Mixed TRISD = %00101110 'Mixed TRISE = %00000000 'Set PORTE for all OUTPUTS TRISF = %11111000 'Set PORTF for use with comparitor direction TRISG = %10000000 'Set PORTG for all OUTPUTS, PORTD pullups ENABLED '----------------------------------------------------------------------------------------
3. Setup I/O, aliases, vars, and constantsCode:DEFINE DEBUG_REG PORTC DEFINE DEBUG_BIT 6 DEFINE DEBUG_BAUD 38400 DEFINE DEBUG_MODE 0
4. MRF initializationCode:SDO var PORTC.5 SDI var PORTC.4 SCLK var PORTC.3 Active var PORTD.0 'Active LED, Active LOW MRFReset var PORTA.1 'MRF module reset MRFDataSel var PORTA.4 'MRF module serial interface data chip select, active LOW MRFConfigSel var PORTA.5 'MRF module serial interface configure chip select, active LOW MRFIrq0 var PORTB.0 'MRF module interupt 0 MRFIrq1 var PORTC.2 'MRF module interupt 1 'Variable List i var byte RF_Init_Values var byte[32] 'An array to initialize the RF unit MRFSPIdata var byte 'Data to/from MRF module MRFregister var byte 'MRF register we want to read/write MRFaddr var byte 'MRF address which is 5 bytes I2CData var byte 'Data byte to/from I2C buffer junk var byte 'Hold dummy data from MRF data1 var byte '1st byte from MRF payload data2 var byte '2nd byte from MRF payload data3 var byte '3rd byte from MRF payload '------------------------------------------------------------------------------------------ 'Constants here ' RF_Init_Values[0] = $28 'Standby mode, 915-928 MHz, VTune by inductors, ENABLE R1/P1/S1 RF_Init_Values[0] = $68 'RECEIVE mode, 915-928 MHz, VTune by inductors, ENABLE R1/P1/S1 RF_Init_Values[1] = $8C 'FSK, max IF gain, Packet Mode RF_Init_Values[2] = $01 '200KHz Freq Dev RF_Init_Values[3] = $63 '2KBps RF_Init_Values[4] = $0C 'for OOK mode, not apliable RF_Init_Values[5] = $03 '16Bytes FIFO, 3 Bytes threshold FIFO transmit interrupt RF_Init_Values[6] = $77 '915MHz R1 Reg RF_Init_Values[7] = $64 '915MHz P1 Reg RF_Init_Values[8] = $32 '915MHz S1 Reg RF_Init_Values[9] = $74 '920MHz R2 Reg RF_Init_Values[10] = $62 '920MHz P2 Reg RF_Init_Values[11] = $32 '920MHz S2 Reg RF_Init_Values[12] = $38 'config mode for OOK, not apliable RF_Init_Values[13] = $0D 'RCV:IRQ0=payload ready + IRQ1=CRC OK 'TX: mostly normal RF_Init_Values[14] = $39 '00111001 RF_Init_Values[15] = $00 ' RF_Init_Values[16] = $A3 'default filters config RF_Init_Values[17] = $38 'default filters config RF_Init_Values[18] = $30 'sync word ON, 24bits, 0 errors tolerance RF_Init_Values[19] = $00 'reserved reg RF_Init_Values[20] = $00 'RSII status read register, 0.5dB / bit RF_Init_Values[21] = $00 'OOK config reg RF_Init_Values[22] = $53 '"S" 1st byte of sync word RF_Init_Values[23] = $43 '"C" 2nd byte of sync word RF_Init_Values[24] = $53 '"S" 3rd byte of sync word - my initials! RF_Init_Values[25] = $00 ' RF_Init_Values[26] = $70 'utoff fcy = 200KHz, output power = 13dBm 0b000 RF_Init_Values[27] = $BC 'clk out by default 427KHz RF_Init_Values[28] = $02 '3 bytes payload RF_Init_Values[29] = $01 'initial MAC ADDRESS, only for test RF_Init_Values[30] = $5E 'Fix Packet Lenght, 3 bytes preamble, whitening ON, CRC ON, Node ADDR|0x00|0xFF filtering RF_Init_Values[31] = $00 'FIFO autocreal enable if CRC fails, Write to FIFO in stby mode for (i = 0; i < 32; i++)
5. Then I try to send something via MRFCode:'MRF initialization here debug "@ MRF init", 10 MRFConfigSel=0 'Select the chip 'Going to try using shiftout before using hardware SPI for i=0 to 31 'Sets up the index var for data MRFaddr=(i << 1) 'Shifts address 1 bit to left, automatically gets start,write, and stop bits SHIFTOUT SDO, SCLK, 1,[MRFaddr,RF_Init_Values(i)] 'send data to register debug "Addr=",bin8 MRFaddr," Value=",hex2 RF_Init_Values[i],13 next i MRFConfigSel=1 'Deselect the chip 'Try to read back some registers as a test to see if they were written correctly MRFConfigSel=0 'Select the chip for i = 0 to 7 'Sets up address to read MRFaddr=((i << 1) | $40) 'Shifts left 1 bit, sets $40 bit, automatically gets start, READ, and stop bits SHIFTOUT SDO, SCLK, 1,[MRFaddr] 'Address to read SHIFTIN SDI, SCLK, 0,[MRFSPIdata] 'Get data from reg debug "MRF Config data: i=", dec1 i, " Register ", bin8 MRFaddr, " Data=", hex2 MRFSPIdata,13 next i
6. Then MRF switches to receive to try to receive the 3 bytes (from the other unit of course).Code:'Try sending something debug "Try sending 3 bytes",13 XMIT_EN: i=0 'Register of interest MRFaddr=(i<<1) 'Gets register address format MRFConfigSel=0 'Select the chip SHIFTOUT SDO, SCLK, 1,[MRFaddr,$88] 'send data, TRANSMIT, 915-928, Vtune by tank caps, Enable R1 P1 S1 MRFConfigSel=1 'Deselect the chip XMIT: MRFDataSel=0 SHIFTOUT SDO, SCLK, 1,[$A1] MRFDataSel=1 MRFDataSel=0 SHIFTOUT SDO, SCLK, 1,[$B1] MRFDataSel=1 MRFDataSel=0 SHIFTOUT SDO, SCLK, 1,[$C1] MRFDataSel=1
My method is this:Code:RCV: i=0 'Register of interest MRFaddr=(i<<1) 'Gets register address format MRFConfigSel=0 'Select the chip SHIFTOUT SDO, SCLK, 1,[MRFaddr,$68] 'send data, RECEIVE, 915-928, Vtune by tank caps, Enable R1 P1 S1 MRFConfigSel=1 'Deselect the chip Wait4Pkt: If MRFIrq0=1 and MRFIrq1=1 then MRFDataSel=0 'Select chip cuz we have a packet ready and CRC is good SHIFTIN SDI, SCLK, 0,[data3] 'Get data from reg MRFDataSel=1 'De-Select chip MRFDataSel=0 'Select chip cuz we have a packet ready and CRC is good SHIFTIN SDI, SCLK, 0,[data2] 'Get data from reg MRFDataSel=1 'De-Select chip MRFDataSel=0 'Select chip cuz we have a packet ready and CRC is good SHIFTIN SDI, SCLK, 0,[data1] 'Get data from reg MRFDataSel=1 'De-Select chip debug "MRF payload: Data3=",hex2 data3," Data2=",hex2 data2," Data1=",hex2 data1,13 endif goto Wait4Pkt
I turn on both units and watch for debug information.
At this time both units should be in receive mode - not very helpful.
So then I reset one of the units which will make it go through everything again including transmit the 3 bytes.
Nothing comes up on the debug window.
No interrupt gets set
I do see IRQ1 (I think - from memory) go high briefly on the transmitting unit which should be transmission done.
I think its in my NOT understanding the transmission/reception registers - I'm more of a digi-head with some analog.
The DS is not too helpful and the Microchip boards and forum are also not very helpful.
Most of the work seems to be using the 2.4 GHz unit but I wanted to use the sub-ghz unit due to my desire to go throughout the house.
You can PM instead of taking up forum space, I will post my final code using hardware SPI and working code for the MRF - as I am certain there HAS to be others struggling!
Regards.
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