mode 00, write from slave to master works

spi_master.v

@@ -65,20 +65,12 @@ task write_data();
 `endif
 endtask
 
-always @ (posedge clk) begin
+task setup_bits();
-	case (state)
-	WAIT_ON_ARM: begin
-		if (!arm) begin
-			idle_state();
-			finished <= 0;
-		end else begin
 	/* at Mode 00, the transmission starts with
-			 * a rising edge, and at mode 11, it starts
+	 * a rising edge, and at mode 11, it starts with a falling
-			 * with a falling edge. For both modes,
+	 * edge. For both modes, these are READs.
-			 * these are READs.
 	 *
-			 * For mode 01 and mode 10, the first
+	 * For mode 01 and mode 10, the first action is a WRITE.
-			 * action is a WRITE.
 	 */
 	if (POLARITY == PHASE) begin
 		mosi <= to_slave[WID-1];
@@ -88,6 +80,16 @@ always @ (posedge clk) begin
 		send_buf <= to_slave;
 		state <= ON_CYCLE;
 	end
+endtask
+
+always @ (posedge clk) begin
+	case (state)
+	WAIT_ON_ARM: begin
+		if (!arm) begin
+			idle_state();
+			finished <= 0;
+		end else begin
+			setup_bits();
 		end
 	end
 	ON_CYCLE: begin

spi_slave.v

@@ -44,6 +44,21 @@ task write_data();
 `endif
 endtask
 
+task setup_bits();
+	/* at Mode 00, the transmission starts with
+	 * a rising edge, and at mode 11, it starts with a falling
+	 * edge. For both modes, these are READs.
+	 *
+	 * For mode 01 and mode 10, the first action is a WRITE.
+	 */
+	if (POLARITY == PHASE) begin
+		miso <= to_master[WID-1];
+		send_buf <= to_master << 1;
+	end else begin
+		send_buf <= to_master;
+	end
+endtask
+
 always @ (posedge clk) begin
 	sck_delay <= sck;
 	ss_delay <= ss;
@@ -53,6 +68,8 @@ always @ (posedge clk) begin
 		bit_counter <= 0;
 		finished <= 0;
 		err <= 0;
+
+		setup_bits();
 	end
 	2'b10: begin // falling edge
 		finished <= 1;