SDK • Re: Help request for using pio and interupts

Code:

#include <stdio.h>#include "pico/stdlib.h"#include "hardware/i2c.h"#include "hardware/pio.h"#include "hardware/irq.h"#include "pico/multicore.h"#include "sgpio.pio.h"// I2C defines#define I2C_PORT i2c0#define I2C_SDA 16#define I2C_SCL 17// SGPIO IN defines#define SDATA_PIN 6#define SCLK_PIN 7#define SLOAD_PIN 8// SGPIO OUT defines#define SCLK1_PIN 3#define SLOAD1_PIN 4#define SDOUT1_PIN 5PIO pio = pio0;uint sm = 0;int sgpio_speed = 1000;// Interrupt handler for PIO RX FIFOvoid pio0_irq_handler() {    uint32_t sgpio_data = pio_sm_get(pio, sm);  // Read data from RX FIFO             printf("Recieved: %b \n", sgpio_data);        }void core1_main(){    while (1) // send dummy SGPIO data    {                   gpio_put(SCLK1_PIN, 1);        gpio_put(SLOAD1_PIN, 1);        gpio_put(SDOUT1_PIN, 1);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 0);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 1);        gpio_put(SLOAD1_PIN, 0);        gpio_put(SDOUT1_PIN, 1);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 0);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 1);        gpio_put(SLOAD1_PIN, 1);        gpio_put(SDOUT1_PIN, 1);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 0);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 1);        gpio_put(SLOAD1_PIN, 0);        gpio_put(SDOUT1_PIN, 1);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 0);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 1);        gpio_put(SLOAD1_PIN, 1);        gpio_put(SDOUT1_PIN, 1);        sleep_us(sgpio_speed);        gpio_put(SCLK1_PIN, 0);        sleep_us(sgpio_speed);        for (int i = 0; i < 5; i++)        {            gpio_put(SCLK1_PIN, 1);            gpio_put(SLOAD1_PIN, 0);            gpio_put(SDOUT1_PIN, 1);            sleep_us(sgpio_speed);            gpio_put(SCLK1_PIN, 0);            sleep_us(sgpio_speed);        }            }    }int main(){    stdio_init_all();    // I2C Initialisation. Using it at 400Khz.    i2c_init(I2C_PORT, 400*1000);        gpio_set_function(I2C_SDA, GPIO_FUNC_I2C);    gpio_set_function(I2C_SCL, GPIO_FUNC_I2C);    gpio_pull_up(I2C_SDA);    gpio_pull_up(I2C_SCL);      // SGPIO pin Init     gpio_init(SCLK1_PIN);    gpio_init(SLOAD1_PIN);    gpio_init(SDOUT1_PIN);    gpio_set_dir(SCLK1_PIN, GPIO_OUT);    gpio_set_dir(SLOAD1_PIN, GPIO_OUT);    gpio_set_dir(SDOUT1_PIN, GPIO_OUT);    // setup pio    uint offset = pio_add_program(pio, &sgpio_program);        sgpio_program_init(pio, sm, offset, SDATA_PIN, SCLK_PIN, SLOAD_PIN);    pio_sm_set_enabled(pio, sm, true);    // Enable interrupt when RX FIFO is not empty    pio_set_irq0_source_enabled(pio, pis_sm0_rx_fifo_not_empty, true);    irq_set_exclusive_handler(PIO0_IRQ_0, pio0_irq_handler);    irq_set_enabled(PIO0_IRQ_0, true);    printf("Loaded program at %d\n", offset);       multicore_launch_core1(core1_main);// Main Loop    while (true) {                sleep_ms(1000);    }}

Code:

;; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.;; SPDX-License-Identifier: BSD-3-Clause;; SET pin 0 should be mapped to your LED GPIO.program sgpiosyncreset:    set y, 5 ; set y = 5syncloop:    wait 1 pin 1    wait 0 pin 1  ; wait for clock falling edge    jmp !y synccomplete ; if y == 0, EOF expected    jmp pin syncreset   ; if SLOAD high, reset counter y and keep waiting     jmp y-- syncloop    ; if SLOAD low, decrement counter y and keep waitingsynccomplete:    set y, 5    wait 1 pin 1    wait 0 pin 1  ; wait for clock falling edge    jmp pin loop1   ; if SLOAD high jump to main recieve loop    jmp synccomplete  ; if SLOAD low, keep waiting.wrap_targetloop1:    wait 1 pin 1    wait 0 pin 1  ; wait for clock falling edge    in pins, 1    ; read DOUT into ISR    jmp pin sloadhigh   ; if SLOAD high, check for EOF    jmp y-- loop1   ; get next bitsloadhigh:    jmp !y dataout  ; if counter y is 0, EOF.     set y, 5    ; reset counter y    jmp loop1   ; if not EOF, get next bitdataout:    push    ; send frame to RX FIFO    set y, 5 ; reset counter y    jmp loop1 ; get next bit.wrap             % c-sdk {// this is a raw helper function for use by the user which sets up the GPIO output, and configures the SM to output on a particular pinvoid sgpio_program_init(PIO pio, uint sm, uint offset, uint data_pin, uint sclk_pin, uint sload_pin) {    pio_sm_config c = sgpio_program_get_default_config(offset);    sm_config_set_in_pins(&c, data_pin);   sm_config_set_jmp_pin(&c, sload_pin);   pio_sm_set_consecutive_pindirs(pio, sm, data_pin, 3, false); // set 3 input pins      pio_gpio_init(pio, data_pin);   pio_gpio_init(pio, sclk_pin);   pio_gpio_init(pio, sload_pin);   pio_sm_init(pio, sm, offset, &c);   }%}