Diff: main.cpp

Revision:

0:68f7b69ecca0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 23 08:24:10 2012 +0000
@@ -0,0 +1,73 @@
+#include "mbed.h"
+#include "TLV320.h"
+
+#define BUF_SIZE 4000
+
+Serial pc(USBTX, USBRX);
+TLV320 audio(p9, p10, 0x34, p5, p6, p7, p8, p16); // I2S Codec
+DigitalOut myled(LED1);
+
+volatile int count = 0;
+int addr = 0;
+int buffer[BUF_SIZE];
+
+// interrupt TLV320 send/recv
+void isr_audio () {
+    int i, a;
+    short l, r, ll, rr;
+    int buf[4];
+
+    // I2S input
+    audio.read();
+    for (i = 0; i < 4; i ++) {
+        buf[i] = audio.rxBuffer[i];
+    }
+
+    for (i = 0; i < 4; i ++) {
+        l = (buffer[addr + i] >> 16);
+        r = (buffer[addr + i] & 0xffff);
+        ll = (buf[i] >> 16);
+        rr = (buf[i] & 0xffff);
+        l = (ll * 0.66) + (l * 0.33);
+        r = (rr * 0.66) + (r * 0.33);
+        buffer[addr + i] = buf[i];
+        buf[i] = (l << 16) | (r & 0xffff);
+    }
+    addr += 4;
+    if (addr >= BUF_SIZE) addr = 0;
+
+    audio.write(buf, 0, 4);
+
+    count ++;
+}
+
+int main() {
+    int time = 0;
+
+    pc.baud(115200);
+    memset(buffer, 0, sizeof(buffer));
+
+    audio.power(0x02); // mic off
+    audio.outputVolume(1, 1); // headphone off
+    audio.inputVolume(1, 1);
+    audio.frequency(44100);
+    audio.attach(&isr_audio);
+    audio.start(RECEIVE);
+    printf("Audio ready\r\n");
+
+    while (1) {
+        printf("%d / %d\r\n", time, count);
+        printf("L %04x / R %04x\r\n", (buffer[0] >> 16), (buffer[0] & 0xffff));
+        time ++;
+
+        myled = 1;
+        wait(0.5);
+        myled = 0;
+        wait(0.5);
+
+//        if (pc.readable()) break;
+    }
+
+    audio.stop();
+    printf("exit\r\n");
+}