Re: [beagleboard] I2C driver by PRU

[John Syne]

A few pieces of advise on how to get these examples to work. Make sure to boot with the custom MLO provided with Starterware as this sets up memory and clocks required by Starterware. Also don’t forget to use the GEL file when launching CCSV6. I also had to add a watchdog disable to the GEL file or else BBB just keeps on rebooting. I have attached my custom GEL file.  -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.

AM335X_beagleboneblack.gel
Description: Binary data

Regards, John On Nov 2, 2015, at 9:29 AM, William Hermans <yyrk...@gmail.com> wrote: Here is one such project, although I'm not sure this is the one I was thinking of https://github.com/BeaglePilot/PRUSS-C the starterware stuff is located in the PRUSS_LIB sub directory. On Mon, Nov 2, 2015 at 10:21 AM, William Hermans <yyrk...@gmail.com> wrote: Yeah that link John gave out seems good. I've been meaning to follow it myself for a couple weeks now. But I've been doing other things waiting for remoteproc / rpmsg to settle down. I really like the idea of remoteproc / rpmsg, it seems very intuitive / natural. Also Micka, there is *some* github project that uses starterware too . . . demonstrating how to use starterware inside a ti_cgt C compiler project . . . I do not remember which it is, so may not be able to find a link to it . . . On Mon, Nov 2, 2015 at 8:37 AM, John Syne <john3...@gmail.com> wrote: Hi Micka, Follow this tutorial: http://processors.wiki.ti.com/index.php/PRU_Training:_Hands-on_Labs Regards, John On Nov 2, 2015, at 1:26 AM, Micka <mickamus...@gmail.com> wrote: Ok, the problem is that in a PRU project you don't have access to the I2C function that you have in the starterware :'( . I guess that I need to code in ASM then ^^ . Le lun. 2 nov. 2015 à 10:01, Micka <mickamus...@gmail.com> a écrit : I found that :  http://www.element14.com/community/community/designcenter/single-board-computers/next-gen_beaglebone//blog/2014/04/30/bbb--pru-c-compiler Le lun. 2 nov. 2015 à 09:48, Micka <mickamus...@gmail.com> a écrit : Ok, thx for the tips. I've CCS & starterware installed. I found the I2C driver. But how do you create a PRU project for the beaglebone black ?  In the CCS App center, the PRU compiler is installed, but I can't find how to create a PRU project ? Micka, Le lun. 2 nov. 2015 à 01:30, John Syne <john3...@gmail.com> a écrit : Hi Micka, With a few tweaks, you can use the drivers from Staterware[1] and use the PRU C compiler. My advice is to use Starterware on the CortexA8 to get familiar with the examples, utilities and driver code. Next you want to pull out just the driver and utility code you need and put it into one file, compile with the PRU C compiler and fix errors and warnings. Don’t forget to add CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;[2] to the start of main(). I do this all with a JTAG emulator. Not sure how you will be able to debug this code otherwise.  [1] http://www.ti.com/tool/starterware-sitara [2] https://git.ti.com/pru-software-support-package Regards, John On Nov 1, 2015, at 4:06 PM, William Hermans <yyrk...@gmail.com> wrote: By the way, I keep seeing stuff like "C2" in PASM assembly in regard to the PRU's. Wish I could figure out what it is . . . Seems to be some sort of constant "register" ? And there is more than just C2, but I have not found any reference to those yet :/ On Sun, Nov 1, 2015 at 5:01 PM, William Hermans <yyrk...@gmail.com> wrote: Hi Micka, I do not think he is using and driver. When speaking of the I2C module, I believe hes speaking of the physical on chip module. But this . . . #define I2C1_BASE            C2                //base registri I2C1 nella tabella translated from Italian to English  . . . I2C1 base registers in the table  which seems to me he is setting up the I2C hardware module directly through it's registers in memory. But the other link, he pasted I do not know if you saw it or not http://beagleboard.org/Community/Forums/?place=msg%2Fbeagleboard%2FDAXyYJOrDIc%2FDZ8WKkRWaC0J he talks about the problem being solved and he was not bringing the hardware module out of reset, which is similar to how the ADC module works. Wish I could help you more, but I know nearly nothing about I2C. I know what it is, and vaguely how it's done, but have never used I2C . . . On Sun, Nov 1, 2015 at 2:45 PM, Micka <mickamus...@gmail.com> wrote: Hi, I'm interested by what you have done.  I want to use i2c to read analog value from a component. The first solution that I found was to bitbang the i2c. But you, you use the i2c driver which is nice. Could you give us the peace of asm code that you use to interface with the MCP23017. And if you have the c code also it would be great. ( if possible, also the part of you managed to activate the module by writing MODULEMODE field into register CM_PER_I2C1_CLKCTRL register and also the code that wait for IDLEST field to confirm that module is ready). Micka, Le dim. 19 juil. 2015 21:45, Gianfranco Rosso <gianfranco.ro...@tiscali.it> a écrit : I've also posted this in I2C topic, the solution is there: http://beagleboard.org/Community/Forums/?place=msg%2Fbeagleboard%2FDAXyYJOrDIc%2FDZ8WKkRWaC0J Il giorno lunedì 13 luglio 2015 09:49:20 UTC+2, Gianfranco Rosso ha scritto: I want to manage the I2C1 module by the PRU, in order to interface some I/O expanders (MCP23017 by Microchip). I use may own "cape" without the plug-n' play eeprom (one of the next steps will be adding management for DCAN0 and DCAN1 so i'll need these pins too...). So, at present, there are just 2 MCP23017 connected to the P9.17 and P9.18. I load the cape-universal into slots and then I use configure-pin command to set P9.17 and P9.18 as i2c I've started from an example into the am335x_pru_package-master and wrote my own C PRU loader. Very simple, it just: loads the PRU codeinit the data exhanged with the PRUstart the PRUwait for ESC key presssignal to the PRU to stopwait for the PRU stopexit. Also the assembly PRU code is simple: init I2C1 module (by writing registers PSC, SCLL, SCLH, CON)init 1st I/O expander as 16 inputs (even if at power on it's already set as input)init 2nd I/O expander as 16 outputscicle reading status of inputs from 1st expander and echoing to the outputs of 2nd expanderexit cycle and halt when receive stop flag from the loader for send and receive I2C messages I use register SA, CNT, DATA and CON. That's very simple and linear... pity, it doesn't work. I didn't see any activity at all in P9.17 and P9.18. The PRU code is surely running, as I add a cycle counter and show it in the loader while it's waiting for ESC keypress, and also the PRU code correctly stops at the loader command. I was expecting that the PRU code stalls if I2C bus doesn't work, as there are waiting cycles both for STOP condition or for CNT reaching zero (depending on the write or read message sending). But it seems running, and running very fast also: the cycle counter is incremented to a very fast rate (over 550 kcycles/s)  that's not compatible with the correct executing of I2C sequences (I've setted the module for 400Kbps rate... so the PRU cycle it's even faster than a single I2C bit time!). I'm surely doing something wrong, but I cant fugure what. Any idea? Suggestions? Inserisci qui il codice... .origin 0 .entrypoint START #include "iic_ioexp.hp" //costanti per l'accesso al modulo I2C1 #define I2C1_BASE            C2                //base registri I2C1 nella tabella costanti #define I2C_SYSC            0x10            //offset del registro I2C_SYSC #define I2C_STAT_RAW        0x24            //offset del registro I2C_STATUS_RAW #define I2C_SYSS            0x90            //offset del registro I2C_SYSS #define I2C_CNT                0x98            //offset del registro I2C_CNT #define I2C_DATA            0x9C            //offset del registro I2C_DATA #define I2C_CON                0xA4            //offset del registro I2C_CON #define I2C_SA                0xAC            //offset del registro I2C_SA #define I2C_PSC                0xB0            //offset del registro I2C_PSC #define I2C_SCLL            0xB4            //offset del registro I2C_SCLL #define I2C_SCLH            0xB8            //offset del registro I2C_SCLH #define I2C_CMD_ENABLE        0x8400            //modulo I2C abilitato come master #define I2C_CMD_TX            0x0200            //modulo I2C in trasmissione #define I2C_CMD_RX            0x0000            //modulo I2C in ricezione #define I2C_CMD_START        0x0001            //modulo I2C richiesta generazione sequenza START #define I2C_CMD_STOP        0x0002            //modulo I2C richiesta generazione sequenza STOP //costanti per l'accesso all'I/O expander MCP23017 #define IO_EXP0                0x20            //7bit I2C address dell'I/O expander 0 (ingressi) #define IO_EXP1                0x21            //7bit I2C address dell'I/O expander 1 (uscite) #define IO_EXP_IODIRA        0x00            //indirizzo registro IODIRA dell'I/O expander #define IO_EXP_GPIOA        0x12            //indirizzo registro GPIOA dell'I/O expander //====================================================================== //macro che attende fine sequenza verificando generazione seqeunza di STOP .macro I2C_WAIT_BY_STOP _CHECK:     LBCO r1.w0, I2C1_BASE, I2C_CON, 2     QBBS _CHECK, r1.t1 .endm    //macro che attende fine sequenza verificando generazione seqeunza di STOP .macro I2C_WAIT_BY_COUNT _CHECK:     LBCO r1.w0, I2C1_BASE, I2C_CNT, 2     QBNE _CHECK, r1.w0, 0 .endm //====================================================================== START:     // clear that bit     LBCO r0, on , 4, 4     CLR r0, r0, 4     SBCO r0, C4, 4, 4     //------------------------------------------------------------------     //configurazione modulo I2C1         //reset del modulo I2C1     MOV r1.w0, 0x0002        SBCO r1.w0, I2C1_BASE, I2C_SYSC, 2         MOV r1.w0, 0x0000        SBCO r1.w0, I2C1_BASE, I2C_SYSC, 2 //    //attesa fine reset modulo //_WAIT_RDONE: //    LBCO r1, I2C1_BASE, I2C_SYSS, 4 //    QBBC _WAIT_RDONE, r1.t0            //configura prescaler e durata SCL H/L per avere 400kHz     MOV r1.b0, 4                //prescaler=4+1 --> ICLK=SCLK/prescaler=100/5=20MHz (nel reference manual raccomandano circa 24Mhz)     SBCO r1.b0, I2C1_BASE, I2C_PSC, 1         MOV r1.b0, 18                //durata SCL L=18+7 --> tLOW=1/ICLK*(SCLL+7)=1/20E6*(18+7)=1.25us     SBCO r1.b0, I2C1_BASE, I2C_SCLL, 1         MOV r1.b0, 20                //durata SCL H=20+5 --> tHIGH=1/ICLK*(SCLH+5)=1/20E6*(20+5)=1.25us     SBCO r1.b0, I2C1_BASE, I2C_SCLH, 1     //abilita modulo     MOV r1.w0, I2C_CMD_ENABLE     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     //------------------------------------------------------------------     //inizializzazione IOEXP 0         //indirizzo slave     MOV r1.w0, IO_EXP0                SBCO r1.w0, I2C1_BASE, I2C_SA, 2     //n. byte da spedire     MOV r1.w0, 3                SBCO r1.w0, I2C1_BASE, I2C_CNT, 2     //riempie FIFO     MOV r1, IO_EXP_IODIRA | 0x00FFFF00        //tutti i pin come ingressi (in realta' e' gia' cosi' dal POR)     SBCO r1.b0, I2C1_BASE, I2C_DATA, 1     SBCO r1.b1, I2C1_BASE, I2C_DATA, 1     SBCO r1.b2, I2C1_BASE, I2C_DATA, 1     //attesa bus free _WAIT_BB:     LBCO r1, I2C1_BASE, I2C_STAT_RAW, 4     QBBS _WAIT_BB, r1.t12     //comando scrittura     MOV r1.w0, I2C_CMD_ENABLE | I2C_CMD_TX | I2C_CMD_START | I2C_CMD_STOP     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     I2C_WAIT_BY_STOP     //------------------------------------------------------------------     //inizializzazione IOEXP 1         //indirizzo slave     MOV r1.w0, IO_EXP1                SBCO r1.w0, I2C1_BASE, I2C_SA, 2     //n. byte da spedire gia' impostato     //riempie FIFO     MOV r1, IO_EXP_IODIRA | 0x00000000        //tutti pin come uscita     SBCO r1.b0, I2C1_BASE, I2C_DATA, 1     SBCO r1.b1, I2C1_BASE, I2C_DATA, 1     SBCO r1.b2, I2C1_BASE, I2C_DATA, 1     //comando scrittura     MOV r1.w0, I2C_CMD_ENABLE | I2C_CMD_TX | I2C_CMD_START | I2C_CMD_STOP     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     I2C_WAIT_BY_STOP     //------------------------------------------------------------------     //ciclo rinfresco I/O _LOOP:       //------------------------------------------------------------------     //legge ingressi         //indirizzo slave     MOV r1.w0, IO_EXP0                SBCO r1.w0, I2C1_BASE, I2C_SA, 2     //n. byte da spedire     MOV r1.w0, 1                SBCO r1.w0, I2C1_BASE, I2C_CNT, 2     //riempie FIFO     MOV r1, IO_EXP_GPIOA     SBCO r1.b0, I2C1_BASE, I2C_DATA, 1        //comando scrittura     MOV r1.w0, I2C_CMD_ENABLE | I2C_CMD_TX | I2C_CMD_START     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     I2C_WAIT_BY_COUNT        //n. byte da ricevere     MOV r1.w0, 2                SBCO r1.w0, I2C1_BASE, I2C_CNT, 2      //comando lettura     MOV r1.w0, I2C_CMD_ENABLE | I2C_CMD_RX | I2C_CMD_START | I2C_CMD_STOP     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     I2C_WAIT_BY_STOP     //legge i byte ricevuti     LBCO r2.b1, I2C1_BASE, I2C_DATA, 1     LBCO r2.b2, I2C1_BASE, I2C_DATA, 1     //------------------------------------------------------------------     //scrive uscite     //indirizzo slave     MOV r1.w0, IO_EXP1                SBCO r1.w0, I2C1_BASE, I2C_SA, 2     //n. byte da spedire     MOV r1.w0, 3                SBCO r1.w0, I2C1_BASE, I2C_CNT, 2     //riempie FIFO     MOV r2.b0, IO_EXP_GPIOA     SBCO r2.b0, I2C1_BASE, I2C_DATA, 1     SBCO r2.b0, I2C1_BASE, I2C_DATA, 1     SBCO r2.b0, I2C1_BASE, I2C_DATA, 1     //comando scrittura     MOV r1.w0, I2C_CMD_ENABLE | I2C_CMD_TX | I2C_CMD_START | I2C_CMD_STOP     SBCO r1.w0, I2C1_BASE, I2C_CON, 2     I2C_WAIT_BY_STOP         //------------------------------------------------------------------     LBCO r2, CONST_PRUDRAM, 0, 4     ADD r2, r2, 1     SBCO r2, CONST_PRUDRAM, 0, 4            //------------------------------------------------------------------     //esce dal ciclo e se il flag di uscita nella ram condivisa e' azzerato     LBCO r2, CONST_PRUDRAM, 4, 1     QBNE _LOOP, r2.b0, 0 _EXIT:     //invia all'host la notifica di programma completato     MOV R31.b0, PRU0_ARM_INTERRUPT+16     HALT -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to 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To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. 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