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//------------------------------
// Module name: ex16_top
// Function: top level module - pass audio input to output directly
// Creator: Peter Cheung
// Version: 2.0
// Date: 10 Nov 2016
//------------------------------
module ex16_top (CLOCK_50, SW, HEX0, HEX1, HEX2,
DAC_SDI, DAC_SCK, DAC_CS, DAC_LD,
ADC_SDI, ADC_SCK, ADC_CS, ADC_SDO, PWM_OUT);
input CLOCK_50; // DE0 50MHz system clock
input [9:0] SW; // 10 slide switches to specify address to ROM
output [6:0] HEX0, HEX1, HEX2;
output DAC_SDI; //Serial data out to SDI of the DAC
output DAC_SCK; //Serial clock signal to both DAC and ADC
output DAC_CS; //Chip select to the DAC, low active
output DAC_LD; //Load new data to DAC, low active
output ADC_SDI; //Serial data out to SDI of the ADC
output ADC_SCK; // ADC Clock signal
output ADC_CS; //Chip select to the ADC, low active
input ADC_SDO; //Converted serial data from ADC
output PWM_OUT; // PWM output to R channel
wire tick_10k; // internal clock at 10kHz
wire [9:0] data_in; // converted data from ADC
wire [9:0] data_out; // processed data to DAC
wire data_valid;
wire DAC_SCK, ADC_SCK;
clktick_16 GEN_10K (CLOCK_50, 1'b1, 16'd4999, tick_10k); // generate 10KHz sampling clock ticks
spi2dac SPI_DAC (CLOCK_50, data_out, tick_10k, // send processed sample to DAC
DAC_SDI, DAC_CS, DAC_SCK, DAC_LD); // order of signals matter
pwm PWM_DC(CLOCK_50, data_out, tick_10k, PWM_OUT); // output via PWM - R-channel
spi2adc SPI_ADC ( // perform a A-to-D conversion
.sysclk (CLOCK_50), // order of parameters do not matter
.channel (1'b1), // use only CH1
.start (tick_10k),
.data_from_adc (data_in),
.data_valid (data_valid),
.sdata_to_adc (ADC_SDI),
.adc_cs (ADC_CS),
.adc_sck (ADC_SCK),
.sdata_from_adc (ADC_SDO));
processor ALLPASS (CLOCK_50, data_in, data_out); // do some processing on the data
hex_to_7seg SEG0 (HEX0, data_in[3:0]);
hex_to_7seg SEG1 (HEX1, data_in[7:4]);
hex_to_7seg SEG2 (HEX2, {2'b0,data_in[9:8]});
endmodule
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