Add SDM C code and example

.xmos_ignore_source_check

@@ -1 +1,2 @@
 python/sw_pll/pll_calc.py
+register_setup.h

CHANGELOG.rst

@@ -1,6 +1,13 @@
 lib_sw_pll library change log
 =============================
 
+2.0.0
+-----
+
+  * ADDED: Double integral term to controller
+  * ADDED: Sigma Delta Modulator option for PLL
+  * CHANGED: Refactored Python model into analogous objects
+
 1.1.0
 -----
 

CMakeLists.txt

@@ -22,4 +22,6 @@ if(PROJECT_IS_TOP_LEVEL)
     add_subdirectory(modules/fwk_io)
     add_subdirectory(tests/test_app)
     add_subdirectory(tests/test_app_low_level_api)
+    add_subdirectory(tests/test_app_sdm_dco)
+    add_subdirectory(tests/test_app_sdm_ctrl)
 endif()

Jenkinsfile

@@ -73,14 +73,26 @@ pipeline {
                                     }
                                     zip archive: true, zipFile: "build.zip", dir: "build"
                                     zip archive: true, zipFile: "tests.zip", dir: "tests/bin"
-                                    archiveArtifacts artifacts: "tests/bin/timing-report.txt", allowEmptyArchive: false
+                                    archiveArtifacts artifacts: "tests/bin/timing-report*.txt", allowEmptyArchive: false
 
                                     junit 'tests/results.xml'
                                 }
                             }
                         }
                     }
                 }
+                stage('Python examples'){
+                    steps {
+                         dir('lib_sw_pll') {
+                            withVenv {
+                                catchError {
+                                    sh './tools/ci/do-model-examples.sh'
+                                }
+                                archiveArtifacts artifacts: "python/sw_pll/*.png,python/sw_pll/*.wav", allowEmptyArchive: false
+                            }
+                        }
+                    }
+                }
             }
             post {
                 cleanup {

doc/settings.json

@@ -1,7 +1,7 @@
 {
     "title": "XMOS SW PLL",
     "project": "SW PLL",
-    "version": "1.1.0",
+    "version": "2.0.0",
     "architectures": {
             "xcore.ai": ["15.2.x"]
           }

doc/substitutions.rst-inc

@@ -1,5 +1,5 @@
-.. |full_version_str| replace:: v1.1.0
-.. |tools_version| replace:: 15.2.x
+.. |full_version_str| replace:: v2.0.0
+.. |tools_version| replace:: 15.2.1
 .. |I2S| replace:: I\ :sup:`2`\ S
 .. |I2C| replace:: I\ :sup:`2`\ C
 .. |trademark| replace:: :sup:`TM`

examples/examples.cmake

@@ -1,2 +1,3 @@
 include(${CMAKE_CURRENT_LIST_DIR}/simple/simple.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/simple_sdm/simple_sdm.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/i2s_slave/i2s_slave.cmake)

examples/i2s_slave/src/i2s_slave_sw_pll.c

@@ -178,6 +178,7 @@ void sw_pll_test(void){
     sw_pll_init(&sw_pll,
                 SW_PLL_15Q16(0.0),
                 SW_PLL_15Q16(1.0),
+                SW_PLL_15Q16(0.0),
                 CONTROL_LOOP_COUNT,
                 PLL_RATIO,
                 BCLKS_PER_LRCLK,
@@ -189,7 +190,7 @@ void sw_pll_test(void){
                 PPM_RANGE);
 
 
-    printf("i_windup_limit: %ld\n", sw_pll.i_windup_limit);
+    printf("i_windup_limit: %ld\n", sw_pll.pi_state.i_windup_limit);
 
 
     // Initialise app_data

examples/shared/src/clock_gen.c

@@ -0,0 +1,60 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+#include <xs1.h>
+#include <stdio.h>
+#include <xcore/hwtimer.h>
+#include <xcore/port.h>
+
+#include "sw_pll_common.h"
+
+#define DO_CLOCKS \
+printf("Ref Hz: %d\n", clock_rate >> 1); \
+\
+unsigned cycle_ticks_int = XS1_TIMER_HZ / clock_rate; \
+unsigned cycle_ticks_remaidner = XS1_TIMER_HZ % clock_rate; \
+unsigned carry = 0; \
+\
+period_trig += XS1_TIMER_HZ * 1; \
+unsigned time_now = hwtimer_get_time(period_tmr); \
+while(TIMER_TIMEAFTER(period_trig, time_now)) \
+{ \
+    port_out(p_clock_gen, port_val); \
+    hwtimer_wait_until(clock_tmr, time_trig); \
+    time_trig += cycle_ticks_int; \
+    carry += cycle_ticks_remaidner; \
+    if(carry >= clock_rate){ \
+        time_trig++; \
+        carry -= clock_rate; \
+    } \
+    port_val ^= 1; \
+    time_now = hwtimer_get_time(period_tmr); \
+}
+
+void clock_gen(unsigned ref_frequency, unsigned ppm_range) // Step from - to + this
+{
+    unsigned clock_rate = ref_frequency * 2; // Note double because we generate edges at this rate
+
+    unsigned clock_rate_low = (unsigned)(clock_rate * (1.0 - (float)ppm_range / 1000000.0));
+    unsigned clock_rate_high = (unsigned)(clock_rate * (1.0 + (float)ppm_range / 1000000.0));
+    unsigned step_size = (clock_rate_high - clock_rate_low) / 20;
+
+    printf("Sweep range: %d %d %d, step size: %d\n", clock_rate_low / 2, clock_rate / 2, clock_rate_high / 2, step_size);
+
+    hwtimer_t period_tmr = hwtimer_alloc();
+    unsigned period_trig = hwtimer_get_time(period_tmr);
+
+    hwtimer_t clock_tmr = hwtimer_alloc();
+    unsigned time_trig = hwtimer_get_time(clock_tmr);
+
+    port_t p_clock_gen = PORT_I2S_BCLK;
+    port_enable(p_clock_gen);
+    unsigned port_val = 1;
+
+    for(unsigned clock_rate = clock_rate_low; clock_rate <= clock_rate_high; clock_rate += 2 * step_size){
+        DO_CLOCKS
+    }
+    for(unsigned clock_rate = clock_rate_high; clock_rate > clock_rate_low; clock_rate -= 2 * step_size){
+        DO_CLOCKS
+    }
+}

examples/shared/src/clock_gen.h

@@ -0,0 +1,6 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+// Runs a task in a thread that produces a clock that sweeps a reference clock
+// between + and - the ppm value specified. 
+void clock_gen(unsigned ref_frequency, unsigned ppm_range);

examples/shared/src/resource_setup.c

@@ -0,0 +1,43 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+#include <stdio.h>
+#include "resource_setup.h"
+
+void setup_ref_and_mclk_ports_and_clocks(port_t p_mclk, xclock_t clk_mclk, port_t p_ref_clk_in, xclock_t clk_word_clk, port_t p_ref_clk_count)
+{
+    // Create clock from mclk port and use it to clock the p_ref_clk port.
+    clock_enable(clk_mclk);
+    port_enable(p_mclk);
+    clock_set_source_port(clk_mclk, p_mclk);
+
+    // Clock p_ref_clk from MCLK
+    port_enable(p_ref_clk_in);
+    port_set_clock(p_ref_clk_in, clk_mclk);
+
+    clock_start(clk_mclk);
+
+    // Create clock from ref_clock_port and use it to clock the p_ref_clk_count port.
+    clock_enable(clk_word_clk);
+    clock_set_source_port(clk_word_clk, p_ref_clk_in);
+    port_enable(p_ref_clk_count);
+    port_set_clock(p_ref_clk_count, clk_word_clk);
+
+    clock_start(clk_word_clk);
+}
+
+
+void setup_recovered_ref_clock_output(port_t p_recovered_ref_clk, xclock_t clk_recovered_ref_clk, port_t p_mclk, unsigned divider)
+{
+    // Connect clock block with divide to mclk
+    clock_enable(clk_recovered_ref_clk);
+    clock_set_source_port(clk_recovered_ref_clk, p_mclk);
+    clock_set_divide(clk_recovered_ref_clk, divider / 2);
+    printf("Divider: %u\n", divider);
+
+    // Output the divided mclk on a port
+    port_enable(p_recovered_ref_clk);
+    port_set_clock(p_recovered_ref_clk, clk_recovered_ref_clk);
+    port_set_out_clock(p_recovered_ref_clk);
+    clock_start(clk_recovered_ref_clk);
+}

examples/shared/src/resource_setup.h

@@ -0,0 +1,17 @@
+// Copyright 2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+#include <xcore/port.h>
+
+#pragma once
+
+// Sets up the provided resources so that we can count PLL output clocks.
+// We do this by clocking the input reference clock port with the output from the PLL
+// and its internal counter is used to count the PLL clock cycles(normal timers cannot count custom clocks)
+// It also sets up a dummy port clocked by the input reference to act as a timing barrier so that 
+// the output clock count can be precisely sampled. 
+void setup_ref_and_mclk_ports_and_clocks(port_t p_mclk, xclock_t clk_mclk, port_t p_ref_clk_in, xclock_t clk_word_clk, port_t p_ref_clk_count);
+
+// Sets up a divided version of the PLL output so it can visually be compared (eg. on a DSO)
+// with the input reference clock to the PLL
+void setup_recovered_ref_clock_output(port_t p_recovered_ref_clk, xclock_t clk_recovered_ref_clk, port_t p_mclk, unsigned divider);

examples/simple/simple.cmake

@@ -1,9 +1,11 @@
 #**********************
 # Gather Sources
 #**********************
-file(GLOB_RECURSE APP_SOURCES ${CMAKE_CURRENT_LIST_DIR}/src/*.c ${CMAKE_CURRENT_LIST_DIR}/src/*.xc)
-set(APP_INCLUDES
-    ${CMAKE_CURRENT_LIST_DIR}/src
+file(GLOB_RECURSE APP_SOURCES   ${CMAKE_CURRENT_LIST_DIR}/src/*.c
+                                ${CMAKE_CURRENT_LIST_DIR}/src/*.xc
+                                ${CMAKE_CURRENT_LIST_DIR}/../shared/src/*.c )
+set(APP_INCLUDES                ${CMAKE_CURRENT_LIST_DIR}/src
+                                ${CMAKE_CURRENT_LIST_DIR}/../shared/src
 )
 
 #**********************

examples/simple/src/main.xc

@@ -3,20 +3,27 @@
 
 #include <platform.h>
 #include <xs1.h>
+#include <stdlib.h>
 
 extern void sw_pll_test(void);
-extern void clock_gen(void);
+extern "C" {
+    #include "clock_gen.h"
+}
+
 
 int main(void)
 {
-  par
-  {
-    on tile[0]: par {
-    }
-    on tile[1]: par {
-        sw_pll_test();
-        clock_gen();
+    par
+    {
+        on tile[0]: par {
+        }
+        on tile[1]: par {
+            sw_pll_test();
+            {
+                clock_gen(48000, 150);
+                exit(0);
+            }
+        }
     }
-  }
   return 0;
 }

examples/simple/src/simple_sw_pll.c

@@ -7,6 +7,7 @@
 #include <xs1.h>
 
 #include "sw_pll.h"
+#include "resource_setup.h"
 
 #define MCLK_FREQUENCY              12288000
 #define REF_FREQUENCY               48000
@@ -21,44 +22,6 @@
 //Found solution: IN 24.000MHz, OUT 12.288018MHz, VCO 3047.43MHz, RD  4, FD  507.905 (m =  19, n =  21), OD  2, FOD   31, ERR +1.50ppm
 #include "fractions.h"
 
-void setup_ref_and_mclk_ports_and_clocks(port_t p_mclk, xclock_t clk_mclk, port_t p_ref_clk_in, xclock_t clk_word_clk, port_t p_ref_clk_count)
-{
-    // Create clock from mclk port and use it to clock the p_ref_clk port.
-    clock_enable(clk_mclk);
-    port_enable(p_mclk);
-    clock_set_source_port(clk_mclk, p_mclk);
-
-    // Clock p_ref_clk from MCLK
-    port_enable(p_ref_clk_in);
-    port_set_clock(p_ref_clk_in, clk_mclk);
-
-    clock_start(clk_mclk);
-
-    // Create clock from ref_clock_port and use it to clock the p_ref_clk_count port.
-    clock_enable(clk_word_clk);
-    clock_set_source_port(clk_word_clk, p_ref_clk_in);
-    port_enable(p_ref_clk_count);
-    port_set_clock(p_ref_clk_count, clk_word_clk);
-
-    clock_start(clk_word_clk);
-}
-
-
-void setup_recovered_ref_clock_output(port_t p_recovered_ref_clk, xclock_t clk_recovered_ref_clk, port_t p_mclk, unsigned divider)
-{
-    // Connect clock block with divide to mclk
-    clock_enable(clk_recovered_ref_clk);
-    clock_set_source_port(clk_recovered_ref_clk, p_mclk);
-    clock_set_divide(clk_recovered_ref_clk, divider / 2);
-    printf("Divider: %u\n", divider);
-
-    // Output the divided mclk on a port
-    port_enable(p_recovered_ref_clk);
-    port_set_clock(p_recovered_ref_clk, clk_recovered_ref_clk);
-    port_set_out_clock(p_recovered_ref_clk);
-    clock_start(clk_recovered_ref_clk);
-}
-
 void sw_pll_test(void){
 
     // Declare mclk and refclk resources and connect up
@@ -78,6 +41,7 @@ void sw_pll_test(void){
     sw_pll_init(&sw_pll,
                 SW_PLL_15Q16(0.0),
                 SW_PLL_15Q16(1.0),
+                SW_PLL_15Q16(0.0),
                 CONTROL_LOOP_COUNT,
                 PLL_RATIO,
                 0,
@@ -111,56 +75,3 @@ void sw_pll_test(void){
         }
     }
 }
-
-#define DO_CLOCKS \
-printf("Ref Hz: %d\n", clock_rate >> 1); \
-\
-unsigned cycle_ticks_int = XS1_TIMER_HZ / clock_rate; \
-unsigned cycle_ticks_remaidner = XS1_TIMER_HZ % clock_rate; \
-unsigned carry = 0; \
-\
-period_trig += XS1_TIMER_HZ * 1; \
-unsigned time_now = hwtimer_get_time(period_tmr); \
-while(TIMER_TIMEAFTER(period_trig, time_now)) \
-{ \
-    port_out(p_clock_gen, port_val); \
-    hwtimer_wait_until(clock_tmr, time_trig); \
-    time_trig += cycle_ticks_int; \
-    carry += cycle_ticks_remaidner; \
-    if(carry >= clock_rate){ \
-        time_trig++; \
-        carry -= clock_rate; \
-    } \
-    port_val ^= 1; \
-    time_now = hwtimer_get_time(period_tmr); \
-}
-
-void clock_gen(void)
-{
-    unsigned clock_rate = REF_FREQUENCY * 2; // Note double because we generate edges at this rate
-    unsigned ppm_range = 150; // Step from - to + this
-
-    unsigned clock_rate_low = (unsigned)(clock_rate * (1.0 - (float)ppm_range / 1000000.0));
-    unsigned clock_rate_high = (unsigned)(clock_rate * (1.0 + (float)ppm_range / 1000000.0));
-    unsigned step_size = (clock_rate_high - clock_rate_low) / 20;
-
-    printf("Sweep range: %d %d %d, step size: %d\n", clock_rate_low / 2, clock_rate / 2, clock_rate_high / 2, step_size);
-
-    hwtimer_t period_tmr = hwtimer_alloc();
-    unsigned period_trig = hwtimer_get_time(period_tmr);
-
-    hwtimer_t clock_tmr = hwtimer_alloc();
-    unsigned time_trig = hwtimer_get_time(clock_tmr);
-
-    port_t p_clock_gen = PORT_I2S_BCLK;
-    port_enable(p_clock_gen);
-    unsigned port_val = 1;
-
-    for(unsigned clock_rate = clock_rate_low; clock_rate <= clock_rate_high; clock_rate += 2 * step_size){
-        DO_CLOCKS
-    }
-    for(unsigned clock_rate = clock_rate_high; clock_rate > clock_rate_low; clock_rate -= 2 * step_size){
-        DO_CLOCKS
-    }
-    exit(0);
-}