CCS/PROCESSOR-SDK-AM335X: Profibus slave for bare-metal

Hi,

Check this link:
    

It is located in the AM3358 product folder under Design & Development tab, called PRU-ICSS Industrial Software for Sitara™ Processors

Best Regards,
Yordan

I need to  direct a GPIO, Hopefully gpio0[1] M18, to the Pru's TX Enable.  We have profibus running but we want to make use of the TX Enable.   I found this snippet...

g_pL2GlobVar->sel_GPO_GPIO = 0 ; /*PRUSS GPO for TX Enable*/
g_pL2GlobVar->gpio_address = 0x0; /*Not used as PRUSS GPO is used for TX Enable*/
g_pL2GlobVar->L3_mem_start_addr = SOC_PRU_ICSS_SHARED_RAM;
g_pL2GlobVar->pru_base_addr = SOC_PRU_ICSS_DATA_RAM0;
g_pL2GlobVar->edma_cc_base_addr = SOC_EDMA30CC_0_REGS;

...unfortunately TL2GlobVar doesn't have any of these members. 

Any help please would be appreciated.

Alex

Thank you Garrett,

We need to have the TX Enable come out o M18 gpio0[1].   

Can you tell me the address 'u32 gpio_address; '  ?

Also my company would be willing to pay for a working code snippet.   How does that work?

Alex

Alex,

You may refer to the address assignment for AM572x:

 g_pL2GlobVar->gpio_address =  CSL_MPU_GPIO4_REGS + GPIO_DATAOUT;/*GPIO base address*/

Where CSL_MPU_GPIO4_REGS  and GPIO_DATAOUT is defined in CSL as:

#define CSL_MPU_GPIO4_REGS                                                      (0x48059000U)

:#define CSL_GPIO_DATAOUT                                        (0x13CU)

Similarly in your case for M18 gpio0[1] in AM335x, you can add the definitions as below:

#define CSL_MPU_GPIO0_REGS                                                      (0x44E07000U)

#define CSL_GPIO_DATAOUT                                        (0x13CU)

in your application as they are not available in the CSL for AM335x.

The CSL_MPU_GPIO0_REGS based address and CSL_GPIO_DATAOUT address are available from the TRM - 

You may try to contact Kunbus to see if they can provide your a working code snippet: https://www.kunbus.com/

Regards,
Garrett

Garrett:   

I added those members to g_pL2GlobVar and set the values to the new members according to your instructions like so....

// agreenberg 09122019
// .... for M18 gpio0[1] in AM335x
#define CSL_GPIO_DATAOUT (0x13CU)
#define CSL_MPU_GPIO0_REGS (0x44E07000U)

g_pL2GlobVar->sel_GPO_GPIO = 0 ; /*PRUSS GPO for TX Enable*/
g_pL2GlobVar->gpio_address = CSL_MPU_GPIO0_REGS + GPIO_DATAOUT;/*GPIO base address*/
g_pL2GlobVar->L3_mem_start_addr = SOC_PRU_ICSS_SHARED_RAM;
g_pL2GlobVar->pru_base_addr = SOC_PRU_ICSS_DATA_RAM0;
g_pL2GlobVar->edma_cc_base_addr = SOC_EDMA30CC_0_REGS;

...BUT what do I do with them??    How are they used?    Where is the API for setting the values?

*********  Please get me in touch with someone in my time zone.   

*********   Someone in North America please respond.