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#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/uart.h"
#include "hardware/gpio.h"
#include "hardware/pio.h"
#include "hardware/clocks.h"
#include "hardware/vreg.h"
#include "pulsegen.pio.h"
#define PIN_NRST 7
#define PIN_TRIG 6
#define PIN_PULSE 0
#define PIN_CAPS 1
#define PIN_LED1 16
#define PIN_LED2 17
int main()
{
/*
* For some reason the serial communication fails after some time when running at 200MHz
* For me everything worked fine at 250 MHz without changing the core voltage (vreg_set_voltage)
*/
set_sys_clock_khz(250000, true);
stdio_init_all();
// GPIO initialisation.
gpio_init(PIN_NRST);
gpio_init(PIN_TRIG);
gpio_init(PIN_PULSE);
gpio_init(PIN_CAPS);
gpio_init(PIN_LED1);
gpio_init(PIN_LED2);
gpio_set_dir(PIN_NRST, GPIO_OUT);
gpio_set_dir(PIN_TRIG, GPIO_IN);
gpio_set_dir(PIN_PULSE, GPIO_OUT);
gpio_set_dir(PIN_CAPS, GPIO_OUT);
gpio_set_dir(PIN_LED1, GPIO_OUT);
gpio_set_dir(PIN_LED2, GPIO_OUT);
gpio_set_pulls(PIN_CAPS, true, false);
gpio_set_drive_strength(PIN_PULSE, GPIO_DRIVE_STRENGTH_12MA);
gpio_set_drive_strength(PIN_CAPS, GPIO_DRIVE_STRENGTH_12MA);
gpio_set_slew_rate(PIN_PULSE, GPIO_SLEW_RATE_FAST);
// Setup PIO
PIO pio = pio0;
uint32_t sm = pio_claim_unused_sm(pio, true);
uint32_t pio_offset = pio_add_program(pio, &pulsegen_program);
pulsegen_program_init(pio, sm, pio_offset, PIN_TRIG, PIN_PULSE, PIN_CAPS);
// Wait for serial connection
while (!stdio_usb_connected()) {
sleep_ms(500);
}
gpio_put(PIN_LED1, true);
gpio_put(PIN_NRST, false);
char cmd;
uint32_t pulse_offset = 0;
uint32_t pulse_width = 0;
uint32_t trig_edges = 1;
uint32_t gpio_states = 0;
uint8_t gpio_pin = 0;
uint8_t gpio_state = 0;
while (true) {
cmd = getchar();
switch (cmd)
{
// Enable glitch SM
case 'A':
gpio_put(PIN_LED2, true);
pio_sm_put_blocking(pio, sm, trig_edges);
pio_sm_put_blocking(pio, sm, pulse_offset);
pio_sm_put_blocking(pio, sm, pulse_width);
gpio_put(PIN_NRST, true);
sleep_ms(46); // Delay to make sure all UT signals are stable
pio_sm_set_enabled(pio, sm, true);
printf("A\n");
break;
// Wait for trigger
case 'B':
while(!pio_interrupt_get(pio0, 0)) {
cmd = getchar_timeout_us(1);
if (cmd == 'D') break; // Disarm
};
pio_sm_set_enabled(pio, sm, false);
pio_interrupt_clear(pio, 0);
pio_sm_clear_fifos(pio, sm);
pio_sm_drain_tx_fifo(pio, sm);
pio_sm_restart(pio, sm);
pio_sm_set_enabled(pio, sm, false);
pio_sm_exec_wait_blocking(pio, sm, pio_encode_set(pio_x, pio_offset));
pio_sm_exec_wait_blocking(pio, sm, pio_encode_mov(pio_pc, pio_x));
printf("T\n");
gpio_put(PIN_LED2, false);
break;
// Set the number of edges before inserting a pulse
case 'E':
fread(&trig_edges, 1, 4, stdin);
printf("%d\n", trig_edges);
break;
// Set the pulse offset
case 'O':
fread(&pulse_offset, 1, 4, stdin);
printf("%d\n", pulse_offset);
break;
// Set the pulse width
case 'W':
fread(&pulse_width, 1, 4, stdin);
printf("%d\n", pulse_width);
break;
// print the current pulse offset and width
case 'S':
printf("PulseGenerator offset: %d, width: %d, edges: %d\n", pulse_offset, pulse_width, trig_edges);
break;
// control a gpio pin, can be expanded to handle multiple pins
case 'G':
fread(&gpio_pin, 1, 1, stdin);
fread(&gpio_state, 1, 1, stdin);
if (gpio_pin == PIN_NRST) {
if (gpio_state == 0) {
gpio_put(PIN_NRST, false);
} else {
gpio_put(PIN_NRST, true);
}
}
printf("G\n");
break;
// Read state of GPIOs
case 'R':
gpio_states = gpio_get_all();
printf("%d\n", gpio_states);
break;
default:
break;
}
}
return 0;
}
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