StartKITでI2S Communication, Rpi Audio Board (TI/PCM5102A)を鳴らす

port J7_1 = XS1_PORT_1F; // J7#1 port BCLK_IN = XS1_PORT_1H; // J7#2 port LRCK_IN = XS1_PORT_1G; // J7#3 port ADIN_IN = XS1_PORT_1E; // J7#4 port J7_10 = XS1_PORT_1J; port J7_11 = XS1_PORT_1K; clock clk1 = XS1_CLKBLK_1; clock clk2 = XS1_CLKBLK_2; clock clk3 = XS1_CLKBLK_3; void port_test(void) { printf("port_test() started.\n"); configure_clock_src(clk1, BCLK_IN); configure_port_clock_output(J7_1, clk1); configure_clock_src(clk2, LRCK_IN); configure_port_clock_output(J7_10, clk2); configure_clock_src(clk3, ADIN_IN); configure_port_clock_output(J7_11, clk3); start_clock(clk1); start_clock(clk2); start_clock(clk3); }

#include <stdio.h>

#include <platform.h>

#include <xs1.h>

#include <xclib.h>

#include <timer.h>

port J7_1 = XS1_PORT_1F; // J7#1 -> BCLK out

port BCLK_IN = XS1_PORT_1H; // J7#2

port LRCK_IN = XS1_PORT_1G; // J7#3

in buffered port:32 ADIN_IN = XS1_PORT_1E; // J7#4

out buffered port:32 ADOUT_OUT = XS1_PORT_1K; // J7#11

port J7_10 = XS1_PORT_1J; // LRCK out

clock clk1 = XS1_CLKBLK_1;

clock clk2 = XS1_CLKBLK_2;

void set_audio_thru( streaming chanend cin,streaming chanend cout)

{

int lr = 0;

unsigned frame_counter = 0;

unsigned int x;

int t;

printf("set_audio_thru() started.\n");

set_clock_src(clk1, BCLK_IN);

set_port_clock(LRCK_IN, clk1);

set_port_clock(ADIN_IN, clk1);

set_port_clock(ADOUT_OUT, clk1);

configure_port_clock_output(J7_1, clk1);

configure_clock_src(clk2, LRCK_IN);

configure_port_clock_output(J7_10, clk2);

start_clock(clk1);

start_clock(clk2);

while (1) {

LRCK_IN when pinsneq(lr) :> lr @ t;

asm("setpt res[%0], %1" :: "r"(ADIN_IN), "r"(t + 24));

cout :> x;

partout_timed(ADOUT_OUT,24,bitrev(x),(t + 33));

asm("in %0, res[%1]" : "=r"(x) : "r"(ADIN_IN));

x = bitrev(x) << 8;

cin <: x;

frame_counter++;

}

}

void aud_inout(streaming chanend cin, streaming chanend cout)

{

unsigned int x;

printf("aud_inout() started.\n");

while(1) {

cout <: x;

cin :> x;

}

}

int main(void)

{

streaming chan cin, cout;

printf("main():hello world.\n");

par {

set_audio_thru(cin,cout);

aud_inout(cin,cout);

}

return 0;

}

port led1 = XS1_PORT_1A;

void aud_inout(streaming chanend cin, streaming chanend cout)

{

unsigned int x;

printf("aud_inout() started.\n");

while(1) {

cout <: x;

cin :> x;

a = (x>>8) & 0xFFFFFF;

if (a & 0x800000) {

a = ~a & 0xFFFFFF;

a = a + 1;

}

if (a > 0x180000) led1 <: 1; else led1 <: 0;

}

}