That did it!
Now I'm a happy "CM_PER..." :)
Now it's on to see if I can get some data moving on the SPI.
Thanks for your help,
Kirk
On Wednesday, September 14, 2016 at 1:23:09 PM UTC-7, Jason Reeder wrote:
>
> #define CM_PER_SPI0_CLKCTRL (*((volatile unsigned int *)
> 0x44E0004C))
> #define CM_PER_SPI1_CLKCTRL (*((volatile unsigned int *)
> 0x44E00050))
>
> in your main method after you enable the OCP master port using
> STANDBY_INIT:
> // to enable SPI0
> while (! (CM_PER_SPI0_CLKCTRL == 0x2) ) {
> CM_PER_SPI0_CLKCTRL = 2;
> }
> //to enable SPI1
> while (! (CM_PER_SPI1_CLKCTRL == 0x2) ) {
> CM_PER_SPI1_CLKCTRL = 2;
> }
>
> Jason Reeder
>
> On Wednesday, September 14, 2016 at 2:48:51 PM UTC-5, Kirk wrote:
>>
>>
>> Jason,
>>
>> I'm trying to use the new sys_mcspi.h header file which you provided.
>>
>> I have a simple test program I adapted from some example code that
>> toggles a gpio pin which I monitor with a scope.
>> I use the toggle rate seen on the scope to determine whether phaseBit is
>> zero or not.
>> (the code is below)
>>
>> The code writes a 1 to the phase control bit in the SPI config register.
>> Then it reads it back into the phaseBit variable.
>>
>>
>> I figure if it writes a 1 it should read back a 1.
>> Trouble is it's always reading back 0.
>> The code does what is expected if I force a 1 or 0 into phaseBit
>>
>>
>> Not sure what I'm doing wrong. (remember I'm new to PRU work)
>>
>> Do does the code have to do something to enable access to the SPI
>> registers?
>>
>> Thanks,
>> Kirk
>>
>>
>> /*
>> * Based on the examples distributed by TI
>> *
>> * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
>> *
>> *
>> * Redistribution and use in source and binary forms, with or without
>> * modification, are permitted provided that the following conditions
>> * are met:
>> *
>> * * Redistributions of source code must retain the above copyright
>> * notice, this list of conditions and the following disclaimer.
>> *
>> * * Redistributions in binary form must reproduce the above copyright
>> * notice, this list of conditions and the following disclaimer in the
>> * documentation and/or other materials provided with the
>> * distribution.
>> *
>> * * Neither the name of Texas Instruments Incorporated nor the names of
>> * its contributors may be used to endorse or promote products derived
>> * from this software without specific prior written permission.
>> *
>> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
>> * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
>> * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
>> * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
>> * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
>> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
>> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
>> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
>> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>> */
>>
>> #include <stdint.h>
>> #include <pru_cfg.h>
>> #include <pru_ctrl.h>
>> #include <sys_mcspi.h>
>> #include "resource_table_empty.h"
>>
>> volatile register uint32_t __R30;
>> volatile register uint32_t __R31;
>>
>> void main(void)
>> {
>> volatile uint32_t gpio;
>>
>> volatile uint32_t phaseBit;
>>
>>
>> /* Clear SYSCFG[STANDBY_INIT] to enable OCP master port */
>> CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
>>
>> // attempt to write an SPI configuration bit and read it back
>> CT_MCSPI0.CH0CONF_bit.PHA = 0x1;
>> phaseBit = CT_MCSPI0.CH0CONF_bit.PHA;
>>
>> // by forcing phaseBit to 0 or 1 here I get the expected toggle rate below
>> // phaseBit = 1;
>>
>>
>> /* Toggle GPO pins TODO: Figure out which to use */
>> gpio = 0x000F;
>>
>> // if phaseBit is non-zero toggle fast, otherwise toggle slow
>> while (1) {
>> __R30 ^= gpio;
>> if(phaseBit == 0)
>> {
>> __delay_cycles(1000000); // toggle at approx 100Hz
>> }
>> else
>> {
>> __delay_cycles(500000); // toggle at approx 200Hz
>> }
>>
>> }
>> }
>>
>>
>>
>>
>> On Wednesday, September 7, 2016 at 3:55:36 AM UTC-7, Jason Reeder wrote:
>>>
>>> Kirk,
>>>
>>> Do a 'git pull' on your pru-software-support-package repo and the
>>> sys_mcspi.h files should be in the include/am335x/ folder. Let me know if
>>> you run into any problems while using it, I didn't have time to test it out.
>>>
>>> Jason Reeder
>>>
>>> On Saturday, September 3, 2016 at 8:30:56 AM UTC-5, Kirk wrote:
>>>>
>>>>
>>>> OK, I see it now. Thanks for pointing that out
>>>> I overlooked it because I thought he pru_*.h files were specific to the
>>>> PRU peripherals.
>>>> Should have looked closer.
>>>>
>>>> Here's the directory I'm looking in and the header files in it:
>>>>
>>>> /opt/source/pru-software-support-package/include/am335x
>>>>
>>>> pru_cfg.h
>>>> pru_ctrl.h
>>>> pru_ecap.h
>>>> pru_iep.h
>>>> pru_intc.h
>>>> pru_uart.h
>>>> sys_mailbox.h
>>>> sys_pwmss.h
>>>>
>>>> I don't see anything for SPI0 and SPI1 on the host processor.
>>>> I'll be needing to get at them too.
>>>> Any ideas?
>>>>
>>>> Thanks,
>>>> Kirk
>>>>
>>>>
>>>>
>>>> On Thursday, September 1, 2016 at 5:18:07 PM UTC-7, Jason Reeder wrote:
>>>>>
>>>>> Check out this header file in the PRU Software Support Package:
>>>>> https://git.ti.com/pru-software-support-package/pru-software-support-package/blobs/master/include/am335x/sys_pwmss.h
>>>>>
>>>>>
>>>>> The eQEP, ePWM, and eCAP modules make up the PWMSS peripheral.
>>>>
>>>>
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