if someone who has the time and know how, could quickly test would be
appreciated;
I have made a quick program, which uses the user LEDs
same behavior; works great when executed from console, does not work when
executed at boot time
main.cpp
//********
#include <stdio.h>
#include <stdlib.h>
#include <prussdrv.h>
#include <pruss_intc_mapping.h>
#include <pthread.h>
#include <unistd.h>
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
#define LED0_PATH "/sys/class/leds/beaglebone:green:usr0"
#define LED1_PATH "/sys/class/leds/beaglebone:green:usr1"
#define LED2_PATH "/sys/class/leds/beaglebone:green:usr2"
#define LED3_PATH "/sys/class/leds/beaglebone:green:usr3"
#define PRU_NUM 1
static void *PRU1DataMemory;
static unsigned int *PRU1DataMemory_int;
void removeTrigger(){
// remove the trigger from the LED
std::fstream fs;
fs.open( LED0_PATH "/trigger", std::fstream::out);
fs << "none";
fs.close();
fs.open (LED0_PATH "/brightness", std::fstream::out);
fs << "0";
fs.close();
fs.open( LED1_PATH "/trigger", std::fstream::out);
fs << "none";
fs.close();
fs.open (LED1_PATH "/brightness", std::fstream::out);
fs << "0";
fs.close();
fs.open( LED2_PATH "/trigger", std::fstream::out);
fs << "none";
fs.close();
fs.open (LED2_PATH "/brightness", std::fstream::out);
fs << "0";
fs.close();
fs.open( LED3_PATH "/trigger", std::fstream::out);
fs << "none";
fs.close();
fs.open (LED3_PATH "/brightness", std::fstream::out);
fs << "0";
fs.close();
}
void *threadFunction(void *value){
do {
std::fstream fs1;
int notimes = prussdrv_pru_wait_event (PRU_EVTOUT_1);
cout << "PRU event 1 " << notimes << endl << flush ;
fs1.open (LED1_PATH "/brightness", std::fstream::out);
fs1 << "1";
fs1.close();
sleep(3);
prussdrv_pru_clear_event (PRU_EVTOUT_1, PRU1_ARM_INTERRUPT);
} while (1);
}
int main (void)
{
if(getuid()!=0){
printf("You must run this program as root. Exiting.\n");
exit(EXIT_FAILURE);
}
pthread_t thread;
tpruss_intc_initdata pruss_intc_initdata = PRUSS_INTC_INITDATA;
std::fstream fs;
removeTrigger();
cout << "All LED's off for 3 second" << endl;
sleep(3); //1 sec delay all LEDS off
// select whether it is on, off or flash
fs.open (LED0_PATH "/brightness", std::fstream::out);
fs << "1";
fs.close();
// Allocate and initialize memory
prussdrv_init ();
prussdrv_open (PRU_EVTOUT_0);
prussdrv_open (PRU_EVTOUT_1);
// Map PRU's INTC
prussdrv_pruintc_init(&pruss_intc_initdata);
// Copy data to PRU memory - different way
prussdrv_map_prumem(PRUSS0_PRU1_DATARAM, &PRU1DataMemory);
PRU1DataMemory_int = (unsigned int *) PRU1DataMemory;
// Use the first 4 bytes for the number of samples
*PRU1DataMemory_int = 500;
// Use the second 4 bytes for the sample delay in ms
*(PRU1DataMemory_int+1) = 100; // 2 milli seconds between samples
// Load and execute binary on PRU
prussdrv_exec_program (PRU_NUM, "./timedelay.bin");
fs.open (LED2_PATH "/brightness", std::fstream::out);
fs << "1";
fs.close();
if(pthread_create(&thread, NULL, &threadFunction, NULL)){
printf("Failed to create thread!");
}
int n = prussdrv_pru_wait_event (PRU_EVTOUT_0);
printf("PRU program completed, event number %d.\n", n);
// distance in inches = time (ms) / 148 according to datasheet
/* Disable PRU and close memory mappings */
prussdrv_pru_disable(PRU_NUM);
prussdrv_exit ();
fs.open (LED3_PATH "/brightness", std::fstream::out);
fs << "1";
fs.close();
return EXIT_SUCCESS;
}
//****************
timedelay.p -> compiled with pasm -b timedelay.p, then chmod +x
timedelay.bin ; place at folder /home/
.origin 0 // offset of the start of the code in PRU memory
.entrypoint START // program entry point, used by debugger only
// To signal the host that we're done, we set bit 5 in our R31
// simultaneously with putting the number of the signal we want
// into R31 bits 0-3. See 5.2.2.2 in AM335x PRU-ICSS Reference Guide.
#define PRU0_R31_VEC_VALID 32;
#define PRU_EVTOUT_0 3
#define PRU_EVTOUT_1 4
#define PRU1_ARM_INTERRUPT 20
#define DELAY_SECONDS 2 // adjust this to experiment
#define CLOCK 200000000 // PRU is always clocked at 200MHz
#define CLOCKS_PER_LOOP 2 // loop contains two instructions, one clock each
#define DELAYCOUNT DELAY_SECONDS * CLOCK / CLOCKS_PER_LOOP
START:
// initialize loop counter
MOV r1, DELAYCOUNT
// wait for specified period of time
DELAY:
SUB r1, r1, 1 // decrement loop counter
QBNE DELAY, r1, 0 // repeat loop unless zero
// tell host we're done
mov r31.b0, PRU1_ARM_INTERRUPT+16
MOV r1, DELAYCOUNT
// wait for specified period of time
DELAY2:
SUB r1, r1, 1 // decrement loop counter
QBNE DELAY2, r1, 0 // repeat loop unless zero
// tell host we're done
mov r31.b0, PRU1_ARM_INTERRUPT+16
// initialize loop counter
MOV r1, DELAYCOUNT
// wait for specified period of time
DELAY1:
SUB r1, r1, 1 // decrement loop counter
QBNE DELAY1, r1, 0 // repeat loop unless zero
// tell host we're done, then halt
mov r31.b0, PRU1_ARM_INTERRUPT+16 //int1
mov r31.b0, PRU1_ARM_INTERRUPT+15 //int0
HALT
executed by bash following instructions
https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/set-rtc-time
bash contents
1. #!/bin/bash
2. sleep 45
3. /home/main
**device tree overlay
/* Device Tree Overlay for enabling the pins that are used in the Chapter 25
* directory for copyright and GNU GPLv3 license information.
*/
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
part-number = "EBB-PRU-MIC";
version = "00A0";
/* This overlay uses the following resources */
exclusive-use =
"P8.46", "P8.45" , "pru1";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
pru_pru_pins: pinmux_pru_pru_pins { // The PRU pin modes
pinctrl-single,pins = <
// See Table 6-7, no pull up/down resistors enabled
// This is for PRU1, the sample clock -- debug only
0x0a4 0x36 // SAMP P8_46 pr1_pru1_pru_r31_1, MODE5 | INPUT |
PULL UP
0x0a0 0x36 // SAMP P8_46 pr1_pru1_pru_r31_0, MODE5 | INPUT |
PULL UP
>;
};
};
};
fragment@1 { // Enable the PRUSS
target = <&pruss>;
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pru_pru_pins>;
};
};
};
**loaded via
add "CAPE=EBB-PRU-MIC" to /etc/default/capemgr
result of loaded devices; HDMI disabled and ADC enabled via /boot/uEnv.txt
root@beaglebone:/# cat /sys/devices/bone_capemgr.?/slots
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPIDEV0
8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-ADC
9: ff:P-O-L Override Board Name,00A0,Override Manuf,EBB-PRU-MIC
I can also email binaries if needed, or source files
--
For more options, visit http://beagleboard.org/discuss
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