Recalbox sur TV CRT en RGB

[Scandy]

@haricot thank you for your answer but still it's not clear to me this: in config.txt it is like setting first hdmi_mode=87 and then hdmi_mode=6, right?
So shouldn't the latter declaration (mode 6) disable the first (mode 87)? Or can I set multiple hdmi_modes at once?

[archimage]

@Scandy It's quite simple :

In config.txt there's only one mode activated by default HDMI_MODE=6 there's no HDMI_MODE=87 in this file.

You create hdmi_cvt=1920 240 60 to recall it later with global.videmode=DMT 87 HDMI in the recalbox.conf file, it turns on the custom mode only when Retroarch launches. When Retroarch shuts down, it comes back to the default mode which is HDMI_MODE=6

[haricot]

when you use Hdmi_cvt , you create an new mode
Note that this simply creates the mode :group 2 mode 87.
and when you use hdmi_mode , you select the mode.
so in the config.txt from archimage when hdmi_cvt is used , it directly goes at 87 , but it use Mode 6 to start the frontend.
only retroarch and so use the mode 87 we have created in config.txt.

in conclusion
HDMI_MODE select the current mode to display when hdmi_cvt create it at bottom , but don't use it.

[haricot]

Re ,
aprés foules de test , c'est au final bien mon adaptateur HDMI/VGA qui fige sur certains Timming , vous auriez pas le lien d'un produit qui passe les réso exotique ( genre sur amazon , ca serait parfait^^ ) ?

merci d'avance.

Stéphane.

[Substring]

@haricot haha la ca va etre compliqué lol

[Scandy]

@haricot Cela pourrait être bon?

[aTg]

You are complicating life with the HDMI converter, I have already finished 10 cables if you want some. With the cable there is no problem with the hdmi_timings

[Substring]

@aTg some people have wired their sticks on GPIO, so it's easier for them this way. We should find a way to use i2c with DPI

[aTg]

I2c with DPI is not possible, but SPI with DPI yes:

I would very much help a programmer who made the soft with UINPUT and SPIDEV

[Substring]

@aTg i'll ask another way : can you free the i2c bus and still enable your gpio2scart ?

[aTg]

@Substring No, are incompatible in many pins and not possible to move.
But with SPI is possible moving CS pin, RPi in last firmwares accepts any gpio to get CS and the other pins is posible integrate in hdmi_mode=3

[haricot]

That was the start of my problem ...
I use the GPIO for input two Nintendo SNES PAD. I was commit to HDMI->VGA for the Display.

Solutions exist that can use SPI and input on the GPIO.
pi 2 jamma
but that cost a lot...

If we find cheaper hardware , it will be the perfect solution for many of use ....

Stéphane.

[Substring]

@aTg Can't reach 60fps with SPI, so we can't go that way. I had hoped that you only needed as many GPIO as the total number of bits, but looks like this is not possible

[aTg]

@Substring SPI for input buttons at 10Mhz and DPI for video output at the same time.

It is totally possible with rgb565 mode3.

[Substring]

@aTg so it means we can combine GPIO video DPI + a i2c MPC23017 ?

[aTg]

@Substring MCP23S17 is a SPI version, tomorrow i can upload a preliminar schematic to work, today i finish the last revision of rgb-pi with all improvements i can do and finally pass to the next project.

[haricot]

@aTg , You made me curious

I'm more comfortable with code than electronic but may be i can be of some help.
I found a lot of doc on SPI , but UINPUT is less common...

somes questions :

-MCP23S17 is a 16 bits inputs , using 2 Joystick and 6 buttons each will use more than 16 bits . does your schematic use two of them ?
-Are you using INT or going on a read loop ?

I take a look at Controlblock sourcecode , Adding a SPI input will not ask for tons of labor.

waiting for your schematics and will make a prototype.

Stéphane.

[Substring]

@haricot We have the mk_gpio_arcade kernel module that is supposed to handle the MPC23017, so no need of any programming, it should already be implemented. Consider 1 MPC23017 per player.

if you want some uinput examples, the easiest I know of is xarcade2jstick that we use for keyboard encoders : https://github.com/petrockblog/Xarcade2Jstick (and i'd love to make it a real configurable thing with ini file support for multiple encoders ... if you ever wanna contribute ...

[aTg]

@haricot Im working on the code of ControlBlockService2 , This is a full working soft to mcp23s17 but the driver to control the chip is bcm2835.c and not is included the lines to use aany GPIO pin to CS, RPi last versions can drive CS from any GPIO pin makin an overlay and i compile one but the ControlBlock (CB) not works in a different pins that 7 or 8:

The especific line on the code is here:

bcm2835.h

/*! \brief bcm2835SPIChipSelect
 Specify the SPI chip select pin(s)
*/
typedef enum
{
   BCM2835_SPI_CS0 = 0,     /*!< Chip Select 0 */
   BCM2835_SPI_CS1 = 1,     /*!< Chip Select 1 */
   BCM2835_SPI_CS2 = 2,     /*!< Chip Select 2 (ie pins CS1 and CS2 are asserted) */
   BCM2835_SPI_CS_NONE = 3,  /*!< No CS, control it yourself */

} bcm2835SPIChipSelect;

Here

airspayce(.com)/mikem/bcm2835/group__constants.html#ga29bba154633d37d07fa130a86e4a1f2aurl REMOVE THE PARENTESIS I SPAM PROBLEM WITH TE FORUM

explain the options por CS but i find another version of the driver.

This include the GPIO CS options for a arduino project, i added the code and compile:

 /*! \brief bcm2835SPIChipSelect
   Specify the SPI chip select pin(s)
 */
 typedef enum
 {
     BCM2835_SPI_CS0 = 0,     /*!< Chip Select 0 */
     BCM2835_SPI_CS1 = 1,     /*!< Chip Select 1 */
     BCM2835_SPI_CS2 = 2,     /*!< Chip Select 2 (ie pins CS1 and CS2 are asserted) */
     BCM2835_SPI_CS_NONE = 3,  /*!< No CS, control it yourself */

      // Only GPIO > 3 can be used (to not interfere with the previous value just above )
          // Lucky we have plenty of theese pins
     BCM2835_SPI_CS_GPIO4  = RPI_V2_GPIO_P1_07, 
     BCM2835_SPI_CS_GPIO17 = RPI_V2_GPIO_P1_11, 
     BCM2835_SPI_CS_GPIO18 = RPI_V2_GPIO_P1_12, 
     BCM2835_SPI_CS_GPIO22 = RPI_V2_GPIO_P1_15, 
     BCM2835_SPI_CS_GPIO23 = RPI_V2_GPIO_P1_16, 
     BCM2835_SPI_CS_GPIO24 = RPI_V2_GPIO_P1_18, 
     BCM2835_SPI_CS_GPIO25 = RPI_V2_GPIO_P1_18, 
     BCM2835_SPI_CS_GPIO28 = RPI_V2_GPIO_P5_03, 
     BCM2835_SPI_CS_GPIO29 = RPI_V2_GPIO_P5_04, 
     BCM2835_SPI_CS_GPIO30 = RPI_V2_GPIO_P5_05, 
     BCM2835_SPI_CS_GPIO31 = RPI_V2_GPIO_P5_06

 } bcm2835SPIChipSelect;

After change the inicialization of the driver in bcm2835.c:

 void bcm2835_spi_begin(void)
 {
volatile uint32_t* paddr;

/* Set the SPI0 pins to the Alt 0 function to enable SPI0 access on them */
bcm2835_gpio_fsel(RPI_GPIO_P1_26, BCM2835_GPIO_FSEL_ALT0); /* CE1 */
-  bcm2835_gpio_fsel(RPI_GPIO_P1_24, BCM2835_GPIO_FSEL_ALT0); /* CE0 */
+ bcm2835_gpio_fsel(RPI_GPIO_P1_22, BCM2835_GPIO_FSEL_OUTP); /* CE0 */
bcm2835_gpio_fsel(RPI_GPIO_P1_21, BCM2835_GPIO_FSEL_ALT0); /* MISO */
bcm2835_gpio_fsel(RPI_GPIO_P1_19, BCM2835_GPIO_FSEL_ALT0); /* MOSI */
bcm2835_gpio_fsel(RPI_GPIO_P1_23, BCM2835_GPIO_FSEL_ALT0); /* CLK */

/* Set the SPI CS register to the some sensible defaults */
paddr = bcm2835_spi0 + BCM2835_SPI0_CS/4;
bcm2835_peri_write(paddr, 0); /* All 0s */

/* Clear TX and RX fifos */
bcm2835_peri_write_nb(paddr, BCM2835_SPI0_CS_CLEAR);
 }

 void bcm2835_spi_end(void)
 {  
/* Set all the SPI0 pins back to input */
bcm2835_gpio_fsel(RPI_GPIO_P1_26, BCM2835_GPIO_FSEL_INPT); /* CE1 */ 
- bcm2835_gpio_fsel(RPI_GPIO_P1_24, BCM2835_GPIO_FSEL_INPT); /* CE0 */
+ bcm2835_gpio_fsel(RPI_GPIO_P1_22, BCM2835_GPIO_FSEL_INPT); /* CE0 */
bcm2835_gpio_fsel(RPI_GPIO_P1_21, BCM2835_GPIO_FSEL_INPT); /* MISO */
bcm2835_gpio_fsel(RPI_GPIO_P1_19, BCM2835_GPIO_FSEL_INPT); /* MOSI */
bcm2835_gpio_fsel(RPI_GPIO_P1_23, BCM2835_GPIO_FSEL_INPT); /* CLK */
 }

And finally i change the file mcp23s17pi.cpp and recompile CB:

 bcm2835_spi_begin();

      bcm2835_spi_setClockDivider (BCM2835_SPI_CLOCK_DIVIDER_32);    // 3.9 MHz     
      bcm2835_spi_chipSelect(BCM2835_SPI_CS_GPIO25);                

All is compiled without errors but not work :_(

[aTg]

The schematic for audio+rgb+buttons over gpio...

https://drive.google.com/open?id=0B71ugqHtPbYMZzY1SHViRFRjUTQ

It's a quick drawing, I'm still working on it.