Tool/software: Code Composer Studio
Hi!
I am using AM3358 to capture data from ADC, but _R31 reg bit 16 always zero!
Pinmux configure as follow
pru_pru_pins: pinmux_pru_pru_pins { // The PRU pin modes
pinctrl-single,pins = <
0x190 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (A13) mcasp0_aclkx.pr1_pru0_pru_r31[0] */
0x194 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (B13) mcasp0_fsx.pr1_pru0_pru_r31[1] */
0x198 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (D12) mcasp0_axr0.pr1_pru0_pru_r31[2] */
0x19c 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (C12) mcasp0_ahclkr.pr1_pru0_pru_r31[3] */
0x1a0 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (B12) mcasp0_aclkr.pr1_pru0_pru_r31[4] */
0x1a4 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (C13) mcasp0_fsr.pr1_pru0_pru_r31[5] */
0x1a8 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (D13) mcasp0_axr1.pr1_pru0_pru_r31[6] */
0x1ac 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (A14) mcasp0_ahclkx.pr1_pru0_pru_r31[7] */
0x0f0 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (F17) mmc0_dat3.pr1_pru0_pru_r31[8] */
0x0f4 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (F18) mmc0_dat2.pr1_pru0_pru_r31[9] */
0x0f8 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (G15) mmc0_dat1.pr1_pru0_pru_r31[10] */
0x0fc 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (G16) mmc0_dat0.pr1_pru0_pru_r31[11] */
0x100 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (G17) mmc0_clk.pr1_pru0_pru_r31[12] */
0x104 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (G18) mmc0_cmd.pr1_pru0_pru_r31[13] */
0x038 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (V13) gpmc_ad14.pr1_pru0_pru_r31[14] */
0x03c 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (U13) gpmc_ad15.pr1_pru0_pru_r31[15] */
0x1b4 0x26 /* ( PIN_INPUT | MUX_MODE5 ) (D14) xdma_event_intr1.pr1_pru0_pru_r31[16] */
>;
};
cat $PINS pin 109 (44e109b4.0) 00000026 pinctrl-single
if i configure pin 0x1b4 as GPIO in device tree
0x1b4 0x27
than
echo 20 > /sys/class/gpio/export
and apply 3.3 V to D14 ZCZ ball i read 1 from gpio20/value file
but when i switch pinmux to PRU the result is 0.
Even if i set pinmux to PULLUP mode 0x36 (in devive tree for 0x1b4 pin offset) reading _R31 register return zero
All other 16 bits (_R31[0:15] are just fine) issue only with _R31[16]
Program for PRU is written on C in CCS with PRU compiler 2.1.4
#define DATA ((uint16_t)(__R31 >> 3)) //Data reg
#define PSYNC (__R31 & 1 << 0) //PSYNC pin
#define VSYNC (__R31 & 1 << 1) //VSYNC pin
#define HSYNC (__R31 & 1 << 2) //HSYNC pin
while(!VSYNC){}
while(VSYNC)
{
uint16_t* cur = (uint16_t*)imageLoc.cur;
while(!HSYNC){}
while(HSYNC)
{
while(!PSYNC){}
*cur = DATA;
sum += *cur;
++cur;
while(PSYNC){}
}
imageLoc.cur = (void*)cur;
//Handle data transfer
//...
}
So what i'm doing wrong?
