forked from PAWPAW-Mirror/lib_xua
104 lines
2.9 KiB
Plaintext
104 lines
2.9 KiB
Plaintext
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/* A very simple *example* of I2S loopback (analog in to analog out)
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* using the I2S module built into lib_xua (usb audio library)
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*
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*
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*/
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#include <xs1.h>
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#include <platform.h>
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#include <xscope.h>
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#include "xua_commands.h"
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#include "xua.h"
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/* Port declarations. Note, the defines come from the xn file */
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buffered out port:32 p_i2s_dac[] = {I2S_MIC_DATA}; /* I2S Data-line(s) */
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buffered in port:32 p_i2s_adc[] = {I2S_DATA_IN}; /* I2S Data-line(s) */
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#if defined(CODEC_MASTER) && (CODEC_MASTER != 0)
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on tile[AUDIO_IO_TILE] : buffered in port:32 p_lrclk = PORT_I2S_LRCLK;
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on tile[AUDIO_IO_TILE] : buffered in port:32 p_bclk = PORT_I2S_BCLK;
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#else
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on tile[AUDIO_IO_TILE] : buffered out port:32 p_lrclk = PORT_I2S_LRCLK;
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on tile[AUDIO_IO_TILE] : buffered out port:32 p_bclk = PORT_I2S_BCLK;
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#endif
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/* Port declarations. Note, the defines come from the xn file */
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/* Master clock for the audio IO tile */
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//on tile[1]: in port p_mclk_in_tile1 = PORT_MCLK_TILE1;
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on tile[0]: in port p_mclk_in = PORT_PDM_MCLK;
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/* Resources for USB feedback */
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in port p_for_mclk_count = PORT_MCLK_COUNT; /* Extra port for counting master clock ticks */
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/* Clock-block declarations */
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clock clk_audio_bclk = on tile[0]: XS1_CLKBLK_3; /* Bit clock */
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clock clk_audio_mclk = on tile[0]: XS1_CLKBLK_2; /* Master clock */
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//clock clk_audio_mclk_usb = on tile[1]: XS1_CLKBLK_1; /* Master clock for USB tile */
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on tile[0] : clock mclk_internal = XS1_CLKBLK_5;
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void set_node_pll_reg(tileref tile_ref, unsigned reg_val){
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write_sswitch_reg(get_tile_id(tile_ref), XS1_SSWITCH_PLL_CTL_NUM, reg_val);
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}
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void run_clock(void) {
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configure_clock_xcore(mclk_internal, 10); // 24.576 MHz
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configure_port_clock_output(p_mclk_in, mclk_internal);
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start_clock(mclk_internal);
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}
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// Nominal setting is ref div = 25, fb_div = 1024, op_div = 2
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// PCF Freq 0.96MHz
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#define PLL_NOM 0xC003FF18 // This is 3.072MHz
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void set_pll(void) {
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set_node_pll_reg(tile[0], PLL_NOM);
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run_clock();
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}
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void loopback(chanend c_i2s)
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{
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int samps[NUM_USB_CHAN_OUT] = {0};
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int sampFreq = FREQ;
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/* This block is the protocol for sample rate change */
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inuint(c_i2s);
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outct(c_i2s, SET_SAMPLE_FREQ);
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outuint(c_i2s, sampFreq);
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chkct(c_i2s, XS1_CT_END);
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while(1)
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{
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inuint(c_i2s);
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for (int i=0; i<NUM_USB_CHAN_OUT; i++) outuint(c_i2s, samps[i]);
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for (int i=0; i<NUM_USB_CHAN_IN; i++) samps[i] = inuint(c_i2s);
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xscope_int(0, samps[0]);
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}
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}
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int main()
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{
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chan c_i2s;
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par {
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on tile[0]: {
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if (CODEC_MASTER == 0) set_pll();
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par {
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XUA_AudioHub(c_i2s, clk_audio_mclk, clk_audio_bclk, p_mclk_in, p_lrclk, p_bclk, p_i2s_dac, p_i2s_adc); //I2S
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loopback(c_i2s);
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}
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}
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}
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return 0;
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}
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