Handle APB frequency change (#2250)

* Add APB change callbacks and move cpu code to own file

* Properly set esp_timer and FreeRTOS tick dividers

* Improve updated devisors

* No need to update REF_TICK yet

* Add initial handling for UART baud change

* fix uartWriteBuf and uartDetectBaudrate

* trigger callbacks even when APB did not change

* toggle UART ISR on CPU change

* add XTAL freq getter and add cpu freq validation

* Support CPU frequency changes in I2C (#2287)

**esp32-hal-i2c.c**
* add callback for cpu frequency changes
* adjust fifo thresholds based on cpu frequency and i2c bus frequency
* reduce i2c bus frequency if differential is too small
**Wire.h**
* version to 1.1.0

* Implement clock change for the other peripherals

* remove bad CPU clock values from the menu

* Add note to CPU freqs that support WiFi and BT

CMakeLists.txt

@@ -3,6 +3,7 @@ set(CORE_SRCS
   cores/esp32/cbuf.cpp
   cores/esp32/esp32-hal-adc.c
   cores/esp32/esp32-hal-bt.c
+  cores/esp32/esp32-hal-cpu.c
   cores/esp32/esp32-hal-dac.c
   cores/esp32/esp32-hal-gpio.c
   cores/esp32/esp32-hal-i2c.c

boards.txt

@@ -50,11 +50,11 @@ esp32.menu.PartitionScheme.min_spiffs.upload.maximum_size=1966080
 esp32.menu.PartitionScheme.fatflash=16M Fat
 esp32.menu.PartitionScheme.fatflash.build.partitions=ffat
 
-esp32.menu.CPUFreq.240=240MHz
+esp32.menu.CPUFreq.240=240MHz (WiFi/BT)
 esp32.menu.CPUFreq.240.build.f_cpu=240000000L
-esp32.menu.CPUFreq.160=160MHz
+esp32.menu.CPUFreq.160=160MHz (WiFi/BT)
 esp32.menu.CPUFreq.160.build.f_cpu=160000000L
-esp32.menu.CPUFreq.80=80MHz
+esp32.menu.CPUFreq.80=80MHz (WiFi/BT)
 esp32.menu.CPUFreq.80.build.f_cpu=80000000L
 esp32.menu.CPUFreq.40=40MHz (40MHz XTAL)
 esp32.menu.CPUFreq.40.build.f_cpu=40000000L
@@ -62,22 +62,10 @@ esp32.menu.CPUFreq.26=26MHz (26MHz XTAL)
 esp32.menu.CPUFreq.26.build.f_cpu=26000000L
 esp32.menu.CPUFreq.20=20MHz (40MHz XTAL)
 esp32.menu.CPUFreq.20.build.f_cpu=20000000L
-esp32.menu.CPUFreq.13=13MHz
+esp32.menu.CPUFreq.13=13MHz (26MHz XTAL)
 esp32.menu.CPUFreq.13.build.f_cpu=13000000L
 esp32.menu.CPUFreq.10=10MHz (40MHz XTAL)
 esp32.menu.CPUFreq.10.build.f_cpu=10000000L
-esp32.menu.CPUFreq.8=8MHz (40MHz XTAL)
-esp32.menu.CPUFreq.8.build.f_cpu=8000000L
-esp32.menu.CPUFreq.5=5MHz
-esp32.menu.CPUFreq.5.build.f_cpu=5000000L
-esp32.menu.CPUFreq.4=4MHz
-esp32.menu.CPUFreq.4.build.f_cpu=4000000L
-esp32.menu.CPUFreq.3=3MHz
-esp32.menu.CPUFreq.3.build.f_cpu=3000000L
-esp32.menu.CPUFreq.2=2MHz
-esp32.menu.CPUFreq.2.build.f_cpu=2000000L
-esp32.menu.CPUFreq.1=1MHz
-esp32.menu.CPUFreq.1.build.f_cpu=1000000L
 
 esp32.menu.FlashMode.qio=QIO
 esp32.menu.FlashMode.qio.build.flash_mode=dio

cores/esp32/esp32-hal-cpu.c

+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "freertos/task.h"
+#include "freertos/xtensa_timer.h"
+#include "esp_attr.h"
+#include "esp_log.h"
+#include "soc/rtc.h"
+#include "soc/rtc_cntl_reg.h"
+#include "rom/rtc.h"
+#include "soc/apb_ctrl_reg.h"
+#include "esp32-hal.h"
+#include "esp32-hal-cpu.h"
+
+typedef struct apb_change_cb_s {
+        struct apb_change_cb_s * next;
+        void * arg;
+        apb_change_cb_t cb;
+} apb_change_t;
+
+const uint32_t MHZ = 1000000;
+
+static apb_change_t * apb_change_callbacks = NULL;
+static xSemaphoreHandle apb_change_lock = NULL;
+
+static void initApbChangeCallback(){
+    static volatile bool initialized = false;
+    if(!initialized){
+        initialized = true;
+        apb_change_lock = xSemaphoreCreateMutex();
+        if(!apb_change_lock){
+            initialized = false;
+        }
+    }
+}
+
+static void triggerApbChangeCallback(apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    initApbChangeCallback();
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    apb_change_t * r = apb_change_callbacks;
+    while(r != NULL){
+        r->cb(r->arg, ev_type, old_apb, new_apb);
+        r=r->next;
+    }
+    xSemaphoreGive(apb_change_lock);
+}
+
+bool addApbChangeCallback(void * arg, apb_change_cb_t cb){
+    initApbChangeCallback();
+    apb_change_t * c = (apb_change_t*)malloc(sizeof(apb_change_t));
+    if(!c){
+        log_e("Callback Object Malloc Failed");
+        return false;
+    }
+    c->next = NULL;
+    c->arg = arg;
+    c->cb = cb;
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    if(apb_change_callbacks == NULL){
+        apb_change_callbacks = c;
+    } else {
+        apb_change_t * r = apb_change_callbacks;
+        if(r->cb != cb || r->arg != arg){
+            while(r->next){
+                r = r->next;
+                if(r->cb == cb && r->arg == arg){
+                    free(c);
+                    goto unlock_and_exit;
+                }
+            }
+            r->next = c;
+        }
+    }
+unlock_and_exit:
+    xSemaphoreGive(apb_change_lock);
+    return true;
+}
+
+bool removeApbChangeCallback(void * arg, apb_change_cb_t cb){
+    initApbChangeCallback();
+    xSemaphoreTake(apb_change_lock, portMAX_DELAY);
+    apb_change_t * r = apb_change_callbacks;
+    if(r == NULL){
+        xSemaphoreGive(apb_change_lock);
+        return false;
+    }
+    if(r->cb == cb && r->arg == arg){
+        apb_change_callbacks = r->next;
+        free(r);
+    } else {
+        while(r->next && (r->next->cb != cb || r->next->arg != arg)){
+            r = r->next;
+        }
+        if(r->next == NULL || r->next->cb != cb || r->next->arg != arg){
+            xSemaphoreGive(apb_change_lock);
+            return false;
+        }
+        apb_change_t * c = r->next;
+        r->next = c->next;
+        free(c);
+    }
+    xSemaphoreGive(apb_change_lock);
+    return true;
+}
+
+static uint32_t calculateApb(rtc_cpu_freq_config_t * conf){
+    if(conf->freq_mhz >= 80){
+        return 80 * MHZ;
+    }
+    return (conf->source_freq_mhz * MHZ) / conf->div;
+}
+
+void esp_timer_impl_update_apb_freq(uint32_t apb_ticks_per_us); //private in IDF
+
+bool setCpuFrequencyMhz(uint32_t cpu_freq_mhz){
+    rtc_cpu_freq_config_t conf, cconf;
+    uint32_t capb, apb;
+    //Get XTAL Frequency and calculate min CPU MHz
+    rtc_xtal_freq_t xtal = rtc_clk_xtal_freq_get();
+    uint32_t min_cpu_mhz = 10;
+    if(xtal > RTC_XTAL_FREQ_AUTO){
+        if(xtal < RTC_XTAL_FREQ_40M) {
+            min_cpu_mhz = xtal / 2; //13Mhz for 26Mhz XTAL
+            if(cpu_freq_mhz <= xtal && cpu_freq_mhz != xtal && cpu_freq_mhz != (xtal/2)){
+                log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2);
+                return false;
+            }
+        } else if(cpu_freq_mhz <= xtal && cpu_freq_mhz != xtal && cpu_freq_mhz != (xtal/2) && cpu_freq_mhz != (xtal/4)){
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4);
+            return false;
+        }
+    }
+    if(cpu_freq_mhz > xtal && cpu_freq_mhz != 240 && cpu_freq_mhz != 160 && cpu_freq_mhz != 80){
+        if(xtal >= RTC_XTAL_FREQ_40M){
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4);
+        } else {
+            log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2);
+        }
+        return false;
+    }
+    //Get current CPU clock configuration
+    rtc_clk_cpu_freq_get_config(&cconf);
+    //return if frequency has not changed
+    if(cconf.freq_mhz == cpu_freq_mhz){
+        return true;
+    }
+    //Get configuration for the new CPU frequency
+    if(!rtc_clk_cpu_freq_mhz_to_config(cpu_freq_mhz, &conf)){
+        log_e("CPU clock could not be set to %u MHz", cpu_freq_mhz);
+        return false;
+    }
+    //Current APB
+    capb = calculateApb(&cconf);
+    //New APB
+    apb = calculateApb(&conf);
+    log_d("%s: %u / %u = %u Mhz, APB: %u Hz", (conf.source == RTC_CPU_FREQ_SRC_PLL)?"PLL":((conf.source == RTC_CPU_FREQ_SRC_APLL)?"APLL":((conf.source == RTC_CPU_FREQ_SRC_XTAL)?"XTAL":"8M")), conf.source_freq_mhz, conf.div, conf.freq_mhz, apb);
+    //Call peripheral functions before the APB change
+    if(apb_change_callbacks){
+        triggerApbChangeCallback(APB_BEFORE_CHANGE, capb, apb);
+    }
+    //Make the frequency change
+    rtc_clk_cpu_freq_set_config_fast(&conf);
+    if(capb != apb){
+        //Update REF_TICK (uncomment if REF_TICK is different than 1MHz)
+        //if(conf.freq_mhz < 80){
+        //    ESP_REG(APB_CTRL_XTAL_TICK_CONF_REG) = conf.freq_mhz / (REF_CLK_FREQ / MHZ) - 1;
+        //}
+        //Update APB Freq REG
+        rtc_clk_apb_freq_update(apb);
+        //Update esp_timer divisor
+        esp_timer_impl_update_apb_freq(apb / MHZ);
+    }
+    //Update FreeRTOS Tick Divisor
+    uint32_t fcpu = (conf.freq_mhz >= 80)?(conf.freq_mhz * MHZ):(apb);
+    _xt_tick_divisor = fcpu / XT_TICK_PER_SEC;
+    //Call peripheral functions after the APB change
+    if(apb_change_callbacks){
+        triggerApbChangeCallback(APB_AFTER_CHANGE, capb, apb);
+    }
+    return true;
+}
+
+uint32_t getCpuFrequencyMhz(){
+    rtc_cpu_freq_config_t conf;
+    rtc_clk_cpu_freq_get_config(&conf);
+    return conf.freq_mhz;
+}
+
+uint32_t getXtalFrequencyMhz(){
+    return rtc_clk_xtal_freq_get();
+}
+
+uint32_t getApbFrequency(){
+    rtc_cpu_freq_config_t conf;
+    rtc_clk_cpu_freq_get_config(&conf);
+    return calculateApb(&conf);
+}

cores/esp32/esp32-hal-cpu.h

+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32_HAL_CPU_H_
+#define _ESP32_HAL_CPU_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+typedef enum { APB_BEFORE_CHANGE, APB_AFTER_CHANGE } apb_change_ev_t;
+
+typedef void (* apb_change_cb_t)(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb);
+
+bool addApbChangeCallback(void * arg, apb_change_cb_t cb);
+bool removeApbChangeCallback(void * arg, apb_change_cb_t cb);
+
+//function takes the following frequencies as valid values:
+//  240, 160, 80    <<< For all XTAL types
+//  40, 20, 10      <<< For 40MHz XTAL
+//  26, 13          <<< For 26MHz XTAL
+//  24, 12          <<< For 24MHz XTAL
+bool setCpuFrequencyMhz(uint32_t cpu_freq_mhz);
+
+uint32_t getCpuFrequencyMhz();  // In MHz
+uint32_t getXtalFrequencyMhz(); // In MHz
+uint32_t getApbFrequency();     // In Hz
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP32_HAL_CPU_H_ */

cores/esp32/esp32-hal-i2c.c

@@ -24,7 +24,7 @@
 #include "soc/i2c_struct.h"
 #include "soc/dport_reg.h"
 #include "esp_attr.h"
-
+#include "esp32-hal-cpu.h" // cpu clock change support 31DEC2018
 //#define I2C_DEV(i)   (volatile i2c_dev_t *)((i)?DR_REG_I2C1_EXT_BASE:DR_REG_I2C_EXT_BASE)
 //#define I2C_DEV(i)   ((i2c_dev_t *)(REG_I2C_BASE(i)))
 #define I2C_SCL_IDX(p)  ((p==0)?I2CEXT0_SCL_OUT_IDX:((p==1)?I2CEXT1_SCL_OUT_IDX:0))
@@ -206,8 +206,8 @@ static i2c_t _i2c_bus_array[2] = {
     {(volatile i2c_dev_t *)(DR_REG_I2C1_EXT_BASE_FIXED), 1, -1, -1,I2C_NONE,I2C_NONE,I2C_ERROR_OK,NULL,NULL,NULL,0,0,0,0,0}
 };
 #else
-#define I2C_MUTEX_LOCK()    do {} while (xSemaphoreTake(i2c->lock, portMAX_DELAY) != pdPASS)
-#define I2C_MUTEX_UNLOCK()  xSemaphoreGive(i2c->lock)
+#define I2C_MUTEX_LOCK()    do {} while (xSemaphoreTakeRecursive(i2c->lock, portMAX_DELAY) != pdPASS)
+#define I2C_MUTEX_UNLOCK()  xSemaphoreGiveRecursive(i2c->lock)
 
 static i2c_t _i2c_bus_array[2] = {
     {(volatile i2c_dev_t *)(DR_REG_I2C_EXT_BASE_FIXED), NULL, 0, -1, -1, I2C_NONE,I2C_NONE,I2C_ERROR_OK,NULL,NULL,NULL,0,0,0,0,0,0},
@@ -445,6 +445,39 @@ static void IRAM_ATTR i2cTriggerDumps(i2c_t * i2c, uint8_t trigger, const char l
 }
  // end of debug support routines
  
+/* Start of CPU Clock change Support
+*/
+
+static void i2cApbChangeCallback(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    i2c_t* i2c = (i2c_t*) arg; // recover data
+    if(i2c == NULL) {  // point to peripheral control block does not exits
+        return false;
+    }
+    uint32_t oldFreq=0;
+    switch(ev_type){
+        case APB_BEFORE_CHANGE : 
+            if(new_apb < 3000000) {// too slow
+                log_e("apb speed %d too slow",new_apb);
+                break;
+            }
+            I2C_MUTEX_LOCK(); // lock will spin until current transaction is completed
+            break;
+        case APB_AFTER_CHANGE :
+            oldFreq = (i2c->dev->scl_low_period.period+i2c->dev->scl_high_period.period); //read old apbCycles 
+            if(oldFreq>0) { // was configured with value
+                oldFreq = old_apb / oldFreq;
+                i2cSetFrequency(i2c,oldFreq);
+            }
+            I2C_MUTEX_UNLOCK();
+            break;
+        default : 
+            log_e("unk ev %u",ev_type);
+            I2C_MUTEX_UNLOCK();
+    }
+    return;
+}
+/* End of CPU Clock change Support
+*/ 
 static void IRAM_ATTR i2cSetCmd(i2c_t * i2c, uint8_t index, uint8_t op_code, uint8_t byte_num, bool ack_val, bool ack_exp, bool ack_check)
 {
     I2C_COMMAND_t cmd;
@@ -1221,6 +1254,12 @@ i2c_err_t i2cProcQueue(i2c_t * i2c, uint32_t *readCount, uint16_t timeOutMillis)
             I2C_MUTEX_UNLOCK();
             return I2C_ERROR_MEMORY;
         }
+        if( !addApbChangeCallback( i2c, i2cApbChangeCallback)) {
+            log_e("install apb Callback failed");
+            I2C_MUTEX_UNLOCK();
+            return I2C_ERROR_DEV;
+        }
+
     }
     //hang until it completes.
 
@@ -1352,6 +1391,9 @@ static void i2cReleaseISR(i2c_t * i2c)
     if(i2c->intr_handle) {
         esp_intr_free(i2c->intr_handle);
         i2c->intr_handle=NULL;
+        if (!removeApbChangeCallback( i2c, i2cApbChangeCallback)) {
+            log_e("unable to release apbCallback");
+        }
     }
 }
 
@@ -1437,8 +1479,7 @@ i2c_err_t i2cDetachSDA(i2c_t * i2c, int8_t sda)
  * PUBLIC API
  * */
 // 24Nov17 only supports Master Mode
-i2c_t * i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency) //before this is called, pins should be detached, else glitch
-{
+i2c_t * i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency) {
   log_v("num=%d sda=%d scl=%d freq=%d",i2c_num, sda, scl, frequency);
     if(i2c_num > 1) {
         return NULL;
@@ -1446,6 +1487,7 @@ i2c_t * i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency) //b
 
     i2c_t * i2c = &_i2c_bus_array[i2c_num];
 
+    // pins should be detached, else glitch
     if(i2c->sda >= 0){
         i2cDetachSDA(i2c, i2c->sda);
     }
@@ -1457,7 +1499,7 @@ i2c_t * i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency) //b
 
 #if !CONFIG_DISABLE_HAL_LOCKS
     if(i2c->lock == NULL) {
-        i2c->lock = xSemaphoreCreateMutex();
+        i2c->lock = xSemaphoreCreateRecursiveMutex();
         if(i2c->lock == NULL) {
             return NULL;
         }
@@ -1604,7 +1646,8 @@ i2c_err_t i2cRead(i2c_t * i2c, uint16_t address, uint8_t* buff, uint16_t size, b
     return last_error;
 }
 
-#define MIN_I2C_CLKS 100
+#define MIN_I2C_CLKS 100              // minimum ratio between cpu and i2c Bus clocks
+#define INTERRUPT_CYCLE_OVERHEAD 16000 // number of cpu clocks necessary to respond to interrupt
 i2c_err_t i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed)
 {
     if(i2c == NULL) {
@@ -1614,17 +1657,18 @@ i2c_err_t i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed)
     uint32_t period = (apb/clk_speed) / 2;
 
     if((apb/8192 > clk_speed)||(apb/MIN_I2C_CLKS < clk_speed)){ //out of bounds
-        log_w("i2c freq(%d) out of bounds.vs APB Clock(%d), min=%d, max=%d",clk_speed,apb,(apb/8192),(apb/MIN_I2C_CLKS));
+        log_d("i2c freq(%d) out of bounds.vs APB Clock(%d), min=%d, max=%d",clk_speed,apb,(apb/8192),(apb/MIN_I2C_CLKS));
     }
     if(period < (MIN_I2C_CLKS/2) ){
         period = (MIN_I2C_CLKS/2);
         clk_speed = apb/(period*2);
-        log_w("APB Freq too slow, Reducing i2c Freq to %d Hz",clk_speed);
+        log_d("APB Freq too slow, Reducing i2c Freq to %d Hz",clk_speed);
     } else if ( period> 4095) {
         period = 4095;
         clk_speed = apb/(period*2);
-        log_w("APB Freq too fast, Increasing i2c Freq to %d Hz",clk_speed);
+        log_d("APB Freq too fast, Increasing i2c Freq to %d Hz",clk_speed);
     }
+    log_v("freq=%dHz",clk_speed);
       
     uint32_t halfPeriod = period/2;
     uint32_t quarterPeriod = period/4;
@@ -1633,14 +1677,19 @@ i2c_err_t i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed)
 
     I2C_FIFO_CONF_t f;
 
-    // Adjust Fifo thresholds based on frequency
     f.val    = i2c->dev->fifo_conf.val;
-    uint32_t a = (clk_speed / 50000L )+1; 
-    if (a > 24) a=24;   
-    f.rx_fifo_full_thrhd = 32 - a;
-    f.tx_fifo_empty_thrhd = a;
+/*  Adjust Fifo thresholds based on differential between cpu frequency and bus clock.
+    The fifo_delta is calculated such that at least INTERRUPT_CYCLE_OVERHEAD cpu clocks are
+    available when a Fifo interrupt is triggered.  This allows enough room in the Fifo so that
+    interrupt latency does not cause a Fifo overflow/underflow event.
+*/
+    log_v("cpu Freq=%dMhz, i2c Freq=%dHz",getCpuFrequencyMhz(),clk_speed);
+    uint32_t fifo_delta = (INTERRUPT_CYCLE_OVERHEAD/((getCpuFrequencyMhz()*1000000 / clk_speed)*10))+1; 
+    if (fifo_delta > 24) fifo_delta=24;   
+    f.rx_fifo_full_thrhd = 32 - fifo_delta;
+    f.tx_fifo_empty_thrhd = fifo_delta;
     i2c->dev->fifo_conf.val = f.val; // set thresholds
-    log_v("Fifo threshold=%d",a);
+    log_v("Fifo delta=%d",fifo_delta);
 
     //the clock num during SCL is low level
     i2c->dev->scl_low_period.period = period;
@@ -1696,6 +1745,8 @@ uint32_t i2cGetStatus(i2c_t * i2c){
     }
     else return 0;
 }
+
+
 /* todo
   22JUL18
     need to add multi-thread capability, use dq.queueEvent as the group marker. When multiple threads

cores/esp32/esp32-hal-ledc.c

@@ -53,6 +53,33 @@ xSemaphoreHandle _ledc_sys_lock;
 #define LEDC_CHAN(g,c) LEDC.channel_group[(g)].channel[(c)]
 #define LEDC_TIMER(g,t) LEDC.timer_group[(g)].timer[(t)]
 
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    if(ev_type == APB_AFTER_CHANGE && old_apb != new_apb){
+        uint32_t iarg = (uint32_t)arg;
+        uint8_t chan = iarg;
+        uint8_t group=(chan/8), timer=((chan/2)%4);
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        if(LEDC_TIMER(group, timer).conf.tick_sel){
+            LEDC_MUTEX_LOCK();
+            uint32_t old_div = LEDC_TIMER(group, timer).conf.clock_divider;
+            uint32_t div_num = (new_apb * old_div) / old_apb;
+            if(div_num > LEDC_DIV_NUM_HSTIMER0_V){
+                new_apb = REF_CLK_FREQ / 1000000;
+                div_num = (new_apb * old_div) / old_apb;
+                if(div_num > LEDC_DIV_NUM_HSTIMER0_V) {
+                    div_num = LEDC_DIV_NUM_HSTIMER0_V;//lowest clock possible
+                }
+                LEDC_TIMER(group, timer).conf.tick_sel = 0;
+            } else if(div_num < 256) {
+                div_num = 256;//highest clock possible
+            }
+            LEDC_TIMER(group, timer).conf.clock_divider = div_num;
+            LEDC_MUTEX_UNLOCK();
+        }
+    }
+}
+
 //uint32_t frequency = (80MHz or 1MHz)/((div_num / 256.0)*(1 << bit_num));
 static void _ledcSetupTimer(uint8_t chan, uint32_t div_num, uint8_t bit_num, bool apb_clk)
 {
@@ -78,6 +105,8 @@ static void _ledcSetupTimer(uint8_t chan, uint32_t div_num, uint8_t bit_num, boo
     LEDC_TIMER(group, timer).conf.rst = 1;//This bit is used to reset timer the counter will be 0 after reset.
     LEDC_TIMER(group, timer).conf.rst = 0;
     LEDC_MUTEX_UNLOCK();
+    uint32_t iarg = chan;
+    addApbChangeCallback((void*)iarg, _on_apb_change);
 }
 
 //max div_num 0x3FFFF (262143)

cores/esp32/esp32-hal-misc.c

@@ -27,6 +27,7 @@
 #include <sys/time.h>
 #include "soc/rtc.h"
 #include "soc/rtc_cntl_reg.h"
+#include "soc/apb_ctrl_reg.h"
 #include "rom/rtc.h"
 #include "esp_task_wdt.h"
 #include "esp32-hal.h"
@@ -100,57 +101,19 @@ void disableCore1WDT(){
 }
 #endif
 
-static uint32_t _cpu_freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
-static uint32_t _sys_time_multiplier = 1;
-
-bool setCpuFrequency(uint32_t cpu_freq_mhz){
-    rtc_cpu_freq_config_t conf, cconf;
-    rtc_clk_cpu_freq_get_config(&cconf);
-    if(cconf.freq_mhz == cpu_freq_mhz && _cpu_freq_mhz == cpu_freq_mhz){
-        return true;
-    }
-    if(!rtc_clk_cpu_freq_mhz_to_config(cpu_freq_mhz, &conf)){
-        log_e("CPU clock could not be set to %u MHz", cpu_freq_mhz);
-        return false;
-    }
-#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_INFO
-    log_i("%s: %u / %u = %u Mhz", (conf.source == RTC_CPU_FREQ_SRC_PLL)?"PLL":((conf.source == RTC_CPU_FREQ_SRC_APLL)?"APLL":((conf.source == RTC_CPU_FREQ_SRC_XTAL)?"XTAL":"8M")), conf.source_freq_mhz, conf.div, conf.freq_mhz);
-    delay(10);
-#endif
-    rtc_clk_cpu_freq_set_config_fast(&conf);
-    _cpu_freq_mhz = conf.freq_mhz;
-    _sys_time_multiplier = 80000000 / getApbFrequency();
-    return true;
-}
-
-uint32_t getCpuFrequency(){
-    rtc_cpu_freq_config_t conf;
-    rtc_clk_cpu_freq_get_config(&conf);
-    return conf.freq_mhz;
-}
-
-uint32_t getApbFrequency(){
-    rtc_cpu_freq_config_t conf;
-    rtc_clk_cpu_freq_get_config(&conf);
-    if(conf.freq_mhz >= 80){
-        return 80000000;
-    }
-    return (conf.source_freq_mhz * 1000000) / conf.div;
-}
-
 unsigned long IRAM_ATTR micros()
 {
-    return (unsigned long) (esp_timer_get_time()) * _sys_time_multiplier;
+    return (unsigned long) (esp_timer_get_time());
 }
 
 unsigned long IRAM_ATTR millis()
 {
-    return (unsigned long) (micros() / 1000);
+    return (unsigned long) (esp_timer_get_time() / 1000);
 }
 
 void delay(uint32_t ms)
 {
-    vTaskDelay((ms * _cpu_freq_mhz) / (portTICK_PERIOD_MS * 240));
+    vTaskDelay(ms / portTICK_PERIOD_MS);
 }
 
 void IRAM_ATTR delayMicroseconds(uint32_t us)
@@ -183,8 +146,10 @@ bool btInUse(){ return false; }
 
 void initArduino()
 {
+    //init proper ref tick value for PLL (uncomment if REF_TICK is different than 1MHz)
+    //ESP_REG(APB_CTRL_PLL_TICK_CONF_REG) = APB_CLK_FREQ / REF_CLK_FREQ - 1;
 #ifdef F_CPU
-    setCpuFrequency(F_CPU/1000000L);
+    setCpuFrequencyMhz(F_CPU/1000000);
 #endif
 #if CONFIG_SPIRAM_SUPPORT
     psramInit();

cores/esp32/esp32-hal-sigmadelta.c

@@ -31,6 +31,26 @@
 xSemaphoreHandle _sd_sys_lock;
 #endif
 
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    if(old_apb == new_apb){
+        return;
+    }
+    uint32_t iarg = (uint32_t)arg;
+    uint8_t channel = iarg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        SIGMADELTA.cg.clk_en = 0;
+    } else {
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        SD_MUTEX_LOCK();
+        uint32_t old_prescale = SIGMADELTA.channel[channel].prescale + 1;
+        SIGMADELTA.channel[channel].prescale = ((new_apb * old_prescale) / old_apb) - 1;
+        SIGMADELTA.cg.clk_en = 0;
+        SIGMADELTA.cg.clk_en = 1;
+        SD_MUTEX_UNLOCK();
+    }
+}
+
 uint32_t sigmaDeltaSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-312500
 {
     if(channel > 7) {
@@ -53,6 +73,8 @@ uint32_t sigmaDeltaSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-31
     SIGMADELTA.cg.clk_en = 0;
     SIGMADELTA.cg.clk_en = 1;
     SD_MUTEX_UNLOCK();
+    uint32_t iarg = channel;
+    addApbChangeCallback((void*)iarg, _on_apb_change);
     return apb_freq/((prescale + 1) * 256);
 }
 

cores/esp32/esp32-hal-spi.c

@@ -372,6 +372,18 @@ void spiSetBitOrder(spi_t * spi, uint8_t bitOrder)
     SPI_MUTEX_UNLOCK();
 }
 
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb)
+{
+    spi_t * spi = (spi_t *)arg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        SPI_MUTEX_LOCK();
+        while(spi->dev->cmd.usr);
+    } else {
+        spi->dev->clock.val = spiFrequencyToClockDiv(old_apb / ((spi->dev->clock.clkdiv_pre + 1) * (spi->dev->clock.clkcnt_n + 1)));
+        SPI_MUTEX_UNLOCK();
+    }
+}
+
 void spiStopBus(spi_t * spi)
 {
     if(!spi) {
@@ -388,6 +400,7 @@ void spiStopBus(spi_t * spi)
     spi->dev->ctrl2.val = 0;
     spi->dev->clock.val = 0;
     SPI_MUTEX_UNLOCK();
+    removeApbChangeCallback(spi, _on_apb_change);
 }
 
 spi_t * spiStartBus(uint8_t spi_num, uint32_t clockDiv, uint8_t dataMode, uint8_t bitOrder)
@@ -434,6 +447,7 @@ spi_t * spiStartBus(uint8_t spi_num, uint32_t clockDiv, uint8_t dataMode, uint8_
     }
     SPI_MUTEX_UNLOCK();
 
+    addApbChangeCallback(spi, _on_apb_change);
     return spi;
 }
 
@@ -1008,17 +1022,17 @@ void IRAM_ATTR spiWritePixelsNL(spi_t * spi, const void * data_in, size_t len){
  * */
 
 typedef union {
-    uint32_t regValue;
+    uint32_t value;
     struct {
-        unsigned regL :6;
-        unsigned regH :6;
-        unsigned regN :6;
-        unsigned regPre :13;
-        unsigned regEQU :1;
+            uint32_t clkcnt_l:       6;                     /*it must be equal to spi_clkcnt_N.*/
+            uint32_t clkcnt_h:       6;                     /*it must be floor((spi_clkcnt_N+1)/2-1).*/
+            uint32_t clkcnt_n:       6;                     /*it is the divider of spi_clk. So spi_clk frequency is system/(spi_clkdiv_pre+1)/(spi_clkcnt_N+1)*/
+            uint32_t clkdiv_pre:    13;                     /*it is pre-divider of spi_clk.*/
+            uint32_t clk_equ_sysclk: 1;                     /*1: spi_clk is eqaul to system 0: spi_clk is divided from system clock.*/
     };
 } spiClk_t;
 
-#define ClkRegToFreq(reg) (apb_freq / (((reg)->regPre + 1) * ((reg)->regN + 1)))
+#define ClkRegToFreq(reg) (apb_freq / (((reg)->clkdiv_pre + 1) * ((reg)->clkcnt_n + 1)))
 
 uint32_t spiClockDivToFrequency(uint32_t clockDiv)
 {
@@ -1038,7 +1052,7 @@ uint32_t spiFrequencyToClockDiv(uint32_t freq)
     const spiClk_t minFreqReg = { 0x7FFFF000 };
     uint32_t minFreq = ClkRegToFreq((spiClk_t*) &minFreqReg);
     if(freq < minFreq) {
-        return minFreqReg.regValue;
+        return minFreqReg.value;
     }
 
     uint8_t calN = 1;
@@ -1051,18 +1065,18 @@ uint32_t spiFrequencyToClockDiv(uint32_t freq)
         int32_t calPre;
         int8_t calPreVari = -2;
 
-        reg.regN = calN;
+        reg.clkcnt_n = calN;
 
         while(calPreVari++ <= 1) {
-            calPre = (((apb_freq / (reg.regN + 1)) / freq) - 1) + calPreVari;
+            calPre = (((apb_freq / (reg.clkcnt_n + 1)) / freq) - 1) + calPreVari;
             if(calPre > 0x1FFF) {
-                reg.regPre = 0x1FFF;
+                reg.clkdiv_pre = 0x1FFF;
             } else if(calPre <= 0) {
-                reg.regPre = 0;
+                reg.clkdiv_pre = 0;
             } else {
-                reg.regPre = calPre;
+                reg.clkdiv_pre = calPre;
             }
-            reg.regL = ((reg.regN + 1) / 2);
+            reg.clkcnt_l = ((reg.clkcnt_n + 1) / 2);
             calFreq = ClkRegToFreq(&reg);
             if(calFreq == (int32_t) freq) {
                 memcpy(&bestReg, &reg, sizeof(bestReg));
@@ -1079,6 +1093,6 @@ uint32_t spiFrequencyToClockDiv(uint32_t freq)
         }
         calN++;
     }
-    return bestReg.regValue;
+    return bestReg.value;
 }
 

cores/esp32/esp32-hal-timer.c

@@ -184,6 +184,18 @@ bool timerAlarmEnabled(hw_timer_t *timer){
     return timer->dev->config.alarm_en;
 }
 
+static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
+    hw_timer_t * timer = (hw_timer_t *)arg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        timer->dev->config.enable = 0;
+    } else {
+        old_apb /= 1000000;
+        new_apb /= 1000000;
+        timer->dev->config.divider = (new_apb * timer->dev->config.divider) / old_apb;
+        timer->dev->config.enable = 1;
+    }
+}
+
 hw_timer_t * timerBegin(uint8_t num, uint16_t divider, bool countUp){
     if(num > 3){
         return NULL;
@@ -205,12 +217,14 @@ hw_timer_t * timerBegin(uint8_t num, uint16_t divider, bool countUp){
     timerAttachInterrupt(timer, NULL, false);
     timerWrite(timer, 0);
     timer->dev->config.enable = 1;
+    addApbChangeCallback(timer, _on_apb_change);
     return timer;
 }
 
 void timerEnd(hw_timer_t *timer){
     timer->dev->config.enable = 0;
     timerAttachInterrupt(timer, NULL, false);
+    removeApbChangeCallback(timer, _on_apb_change);
 }
 
 void timerAttachInterrupt(hw_timer_t *timer, void (*fn)(void), bool edge){
@@ -271,23 +285,23 @@ void timerDetachInterrupt(hw_timer_t *timer){
 uint64_t timerReadMicros(hw_timer_t *timer){
     uint64_t timer_val = timerRead(timer);
     uint16_t div = timerGetDivider(timer);
-    return timer_val * div / 80;
+    return timer_val * div / (getApbFrequency() / 1000000);
 }
 
 double timerReadSeconds(hw_timer_t *timer){
     uint64_t timer_val = timerRead(timer);
     uint16_t div = timerGetDivider(timer);
-    return (double)timer_val * div / 80000000;
+    return (double)timer_val * div / getApbFrequency();
 }
 
 uint64_t timerAlarmReadMicros(hw_timer_t *timer){
     uint64_t timer_val = timerAlarmRead(timer);
     uint16_t div = timerGetDivider(timer);
-    return timer_val * div / 80;
+    return timer_val * div / (getApbFrequency() / 1000000);
 }
 
 double timerAlarmReadSeconds(hw_timer_t *timer){
     uint64_t timer_val = timerAlarmRead(timer);
     uint16_t div = timerGetDivider(timer);
-    return (double)timer_val * div / 80000000;
+    return (double)timer_val * div / getApbFrequency();
 }

cores/esp32/esp32-hal-uart.c

@@ -67,6 +67,8 @@ static uart_t _uart_bus_array[3] = {
 };
 #endif
 
+static void uart_on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb);
+
 static void IRAM_ATTR _uart_isr(void *arg)
 {
     uint8_t i, c;
@@ -216,6 +218,7 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
         uartAttachTx(uart, txPin, inverted);
     }
 
+    addApbChangeCallback(uart, uart_on_apb_change);
     return uart;
 }
 
@@ -224,11 +227,10 @@ void uartEnd(uart_t* uart)
     if(uart == NULL) {
         return;
     }
+    removeApbChangeCallback(uart, uart_on_apb_change);
 
     UART_MUTEX_LOCK();
     if(uart->queue != NULL) {
-        uint8_t c;
-        while(xQueueReceive(uart->queue, &c, 0));
         vQueueDelete(uart->queue);
         uart->queue = NULL;
     }
@@ -248,8 +250,6 @@ size_t uartResizeRxBuffer(uart_t * uart, size_t new_size) {
 
     UART_MUTEX_LOCK();
     if(uart->queue != NULL) {
-        uint8_t c;
-        while(xQueueReceive(uart->queue, &c, 0));
         vQueueDelete(uart->queue);
         uart->queue = xQueueCreate(new_size, sizeof(uint8_t));
         if(uart->queue == NULL) {
@@ -319,10 +319,9 @@ void uartWriteBuf(uart_t* uart, const uint8_t * data, size_t len)
     }
     UART_MUTEX_LOCK();
     while(len) {
-        while(len && uart->dev->status.txfifo_cnt < 0x7F) {
-            uart->dev->fifo.rw_byte = *data++;
-            len--;
-        }
+        while(uart->dev->status.txfifo_cnt == 0x7F);
+        uart->dev->fifo.rw_byte = *data++;
+        len--;
     }
     UART_MUTEX_UNLOCK();
 }
@@ -359,13 +358,49 @@ void uartSetBaudRate(uart_t* uart, uint32_t baud_rate)
     UART_MUTEX_UNLOCK();
 }
 
+static void uart_on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb)
+{
+    uart_t* uart = (uart_t*)arg;
+    if(ev_type == APB_BEFORE_CHANGE){
+        UART_MUTEX_LOCK();
+        //disabple interrupt
+        uart->dev->int_ena.val = 0;
+        uart->dev->int_clr.val = 0xffffffff;
+        // read RX fifo
+        uint8_t c;
+        BaseType_t xHigherPriorityTaskWoken;
+        while(uart->dev->status.rxfifo_cnt != 0 || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr)) {
+            c = uart->dev->fifo.rw_byte;
+            if(uart->queue != NULL && !xQueueIsQueueFullFromISR(uart->queue)) {
+                xQueueSendFromISR(uart->queue, &c, &xHigherPriorityTaskWoken);
+            }
+        }
+        // wait TX empty
+        while(uart->dev->status.txfifo_cnt || uart->dev->status.st_utx_out);
+    } else {
+        //todo:
+        // set baudrate
+        uint32_t clk_div = (uart->dev->clk_div.div_int << 4) | (uart->dev->clk_div.div_frag & 0x0F);
+        uint32_t baud_rate = ((old_apb<<4)/clk_div);
+        clk_div = ((new_apb<<4)/baud_rate);
+        uart->dev->clk_div.div_int = clk_div>>4 ;
+        uart->dev->clk_div.div_frag = clk_div & 0xf;
+        //enable interrupts
+        uart->dev->int_ena.rxfifo_full = 1;
+        uart->dev->int_ena.frm_err = 1;
+        uart->dev->int_ena.rxfifo_tout = 1;
+        uart->dev->int_clr.val = 0xffffffff;
+        UART_MUTEX_UNLOCK();
+    }
+}
+
 uint32_t uartGetBaudRate(uart_t* uart)
 {
     if(uart == NULL) {
         return 0;
     }
     uint32_t clk_div = (uart->dev->clk_div.div_int << 4) | (uart->dev->clk_div.div_frag & 0x0F);
-    return ((UART_CLK_FREQ<<4)/clk_div);
+    return ((getApbFrequency()<<4)/clk_div);
 }
 
 static void IRAM_ATTR uart0_write_char(char c)
@@ -505,7 +540,7 @@ uartDetectBaudrate(uart_t *uart)
     uart->dev->auto_baud.en = 0;
     uartStateDetectingBaudrate = false; // Initialize for the next round
 
-    unsigned long baudrate = UART_CLK_FREQ / divisor;
+    unsigned long baudrate = getApbFrequency() / divisor;
 
     static const unsigned long default_rates[] = {300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 256000, 460800, 921600, 1843200, 3686400};
 

cores/esp32/esp32-hal.h

@@ -62,6 +62,7 @@ void yield(void);
 #include "esp32-hal-timer.h"
 #include "esp32-hal-bt.h"
 #include "esp32-hal-psram.h"
+#include "esp32-hal-cpu.h"
 
 #ifndef BOARD_HAS_PSRAM
 #ifdef CONFIG_SPIRAM_SUPPORT
@@ -87,15 +88,6 @@ void enableCore1WDT();
 void disableCore1WDT();
 #endif
 
-//function takes the following frequencies as valid values:
-//  240, 160, 80                     <<< For all XTAL types
-//  40, 20, 13, 10, 8, 5, 4, 3, 2, 1 <<< For 40MHz XTAL
-//  26, 13, 5, 4, 3, 2, 1            <<< For 26MHz XTAL
-//  24, 12, 8, 6, 4, 3, 2, 1         <<< For 24MHz XTAL
-bool setCpuFrequency(uint32_t cpu_freq_mhz);
-uint32_t getCpuFrequency();
-uint32_t getApbFrequency();
-
 unsigned long micros();
 unsigned long millis();
 void delay(uint32_t);

libraries/Wire/src/Wire.h

@@ -30,7 +30,7 @@
 #include "freertos/queue.h"
 #include "Stream.h"
 
-#define STICKBREAKER V1.0.1
+#define STICKBREAKER 'V1.1.0'
 #define I2C_BUFFER_LENGTH 128
 typedef void(*user_onRequest)(void);
 typedef void(*user_onReceive)(uint8_t*, int);
@@ -138,6 +138,7 @@ extern TwoWire Wire1;
 
 
 /*
+V1.1.0 08JAN2019 Support CPU Clock frequency changes
 V1.0.2 30NOV2018 stop returning I2C_ERROR_CONTINUE on ReSTART operations, regain compatibility with Arduino libs
 V1.0.1 02AUG2018 First Fix after release, Correct ReSTART handling, change Debug control, change begin()
   to a function, this allow reporting if bus cannot be initialized, Wire.begin() can be used to recover