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| 1 | +// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | + |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +#include"sdkconfig.h" |
| 16 | +#include"freertos/FreeRTOS.h" |
| 17 | +#include"freertos/semphr.h" |
| 18 | +#include"freertos/task.h" |
| 19 | +#include"freertos/xtensa_timer.h" |
| 20 | +#include"esp_attr.h" |
| 21 | +#include"esp_log.h" |
| 22 | +#include"soc/rtc.h" |
| 23 | +#include"soc/rtc_cntl_reg.h" |
| 24 | +#include"rom/rtc.h" |
| 25 | +#include"soc/apb_ctrl_reg.h" |
| 26 | +#include"esp32-hal.h" |
| 27 | +#include"esp32-hal-cpu.h" |
| 28 | + |
| 29 | +typedefstructapb_change_cb_s { |
| 30 | +structapb_change_cb_s*next; |
| 31 | +void*arg; |
| 32 | +apb_change_cb_tcb; |
| 33 | +} apb_change_t; |
| 34 | + |
| 35 | +constuint32_tMHZ=1000000; |
| 36 | + |
| 37 | +staticapb_change_t*apb_change_callbacks=NULL; |
| 38 | +staticxSemaphoreHandleapb_change_lock=NULL; |
| 39 | + |
| 40 | +staticvoidinitApbChangeCallback(){ |
| 41 | +staticvolatileboolinitialized= false; |
| 42 | +if(!initialized){ |
| 43 | +initialized= true; |
| 44 | +apb_change_lock=xSemaphoreCreateMutex(); |
| 45 | +if(!apb_change_lock){ |
| 46 | +initialized= false; |
| 47 | + } |
| 48 | + } |
| 49 | +} |
| 50 | + |
| 51 | +staticvoidtriggerApbChangeCallback(apb_change_ev_tev_type, uint32_told_apb, uint32_tnew_apb){ |
| 52 | +initApbChangeCallback(); |
| 53 | +xSemaphoreTake(apb_change_lock, portMAX_DELAY); |
| 54 | +apb_change_t*r=apb_change_callbacks; |
| 55 | +while(r!=NULL){ |
| 56 | +r->cb(r->arg, ev_type, old_apb, new_apb); |
| 57 | +r=r->next; |
| 58 | + } |
| 59 | +xSemaphoreGive(apb_change_lock); |
| 60 | +} |
| 61 | + |
| 62 | +booladdApbChangeCallback(void*arg, apb_change_cb_tcb){ |
| 63 | +initApbChangeCallback(); |
| 64 | +apb_change_t*c= (apb_change_t*)malloc(sizeof(apb_change_t)); |
| 65 | +if(!c){ |
| 66 | +log_e("Callback Object Malloc Failed"); |
| 67 | +return false; |
| 68 | + } |
| 69 | +c->next=NULL; |
| 70 | +c->arg=arg; |
| 71 | +c->cb=cb; |
| 72 | +xSemaphoreTake(apb_change_lock, portMAX_DELAY); |
| 73 | +if(apb_change_callbacks==NULL){ |
| 74 | +apb_change_callbacks=c; |
| 75 | + } else { |
| 76 | +apb_change_t*r=apb_change_callbacks; |
| 77 | +if(r->cb!=cb||r->arg!=arg){ |
| 78 | +while(r->next){ |
| 79 | +r=r->next; |
| 80 | +if(r->cb==cb&&r->arg==arg){ |
| 81 | +free(c); |
| 82 | + goto unlock_and_exit; |
| 83 | + } |
| 84 | + } |
| 85 | +r->next=c; |
| 86 | + } |
| 87 | + } |
| 88 | +unlock_and_exit: |
| 89 | +xSemaphoreGive(apb_change_lock); |
| 90 | +return true; |
| 91 | +} |
| 92 | + |
| 93 | +boolremoveApbChangeCallback(void*arg, apb_change_cb_tcb){ |
| 94 | +initApbChangeCallback(); |
| 95 | +xSemaphoreTake(apb_change_lock, portMAX_DELAY); |
| 96 | +apb_change_t*r=apb_change_callbacks; |
| 97 | +if(r==NULL){ |
| 98 | +xSemaphoreGive(apb_change_lock); |
| 99 | +return false; |
| 100 | + } |
| 101 | +if(r->cb==cb&&r->arg==arg){ |
| 102 | +apb_change_callbacks=r->next; |
| 103 | +free(r); |
| 104 | + } else { |
| 105 | +while(r->next&& (r->next->cb!=cb||r->next->arg!=arg)){ |
| 106 | +r=r->next; |
| 107 | + } |
| 108 | +if(r->next==NULL||r->next->cb!=cb||r->next->arg!=arg){ |
| 109 | +xSemaphoreGive(apb_change_lock); |
| 110 | +return false; |
| 111 | + } |
| 112 | +apb_change_t*c=r->next; |
| 113 | +r->next=c->next; |
| 114 | +free(c); |
| 115 | + } |
| 116 | +xSemaphoreGive(apb_change_lock); |
| 117 | +return true; |
| 118 | +} |
| 119 | + |
| 120 | +staticuint32_tcalculateApb(rtc_cpu_freq_config_t*conf){ |
| 121 | +if(conf->freq_mhz >= 80){ |
| 122 | +return80*MHZ; |
| 123 | + } |
| 124 | +return (conf->source_freq_mhz*MHZ) / conf->div; |
| 125 | +} |
| 126 | + |
| 127 | +voidesp_timer_impl_update_apb_freq(uint32_tapb_ticks_per_us); //private in IDF |
| 128 | + |
| 129 | +boolsetCpuFrequencyMhz(uint32_tcpu_freq_mhz){ |
| 130 | +rtc_cpu_freq_config_tconf, cconf; |
| 131 | +uint32_tcapb, apb; |
| 132 | +//Get XTAL Frequency and calculate min CPU MHz |
| 133 | +rtc_xtal_freq_txtal=rtc_clk_xtal_freq_get(); |
| 134 | +uint32_tmin_cpu_mhz=10; |
| 135 | +if(xtal>RTC_XTAL_FREQ_AUTO){ |
| 136 | +if(xtal<RTC_XTAL_FREQ_40M) { |
| 137 | +min_cpu_mhz=xtal / 2; //13Mhz for 26Mhz XTAL |
| 138 | +if(cpu_freq_mhz <= xtal&&cpu_freq_mhz!=xtal&&cpu_freq_mhz!= (xtal/2)){ |
| 139 | +log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2); |
| 140 | +return false; |
| 141 | + } |
| 142 | + } elseif(cpu_freq_mhz <= xtal&&cpu_freq_mhz!=xtal&&cpu_freq_mhz!= (xtal/2) &&cpu_freq_mhz!= (xtal/4)){ |
| 143 | +log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4); |
| 144 | +return false; |
| 145 | + } |
| 146 | + } |
| 147 | +if(cpu_freq_mhz>xtal&&cpu_freq_mhz!=240&&cpu_freq_mhz!=160&&cpu_freq_mhz!=80){ |
| 148 | +if(xtal >= RTC_XTAL_FREQ_40M){ |
| 149 | +log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2, xtal/4); |
| 150 | + } else { |
| 151 | +log_e("Bad frequency: %u MHz! Options are: 240, 160, 80, %u and %u MHz", cpu_freq_mhz, xtal, xtal/2); |
| 152 | + } |
| 153 | +return false; |
| 154 | + } |
| 155 | +//Get current CPU clock configuration |
| 156 | +rtc_clk_cpu_freq_get_config(&cconf); |
| 157 | +//return if frequency has not changed |
| 158 | +if(cconf.freq_mhz==cpu_freq_mhz){ |
| 159 | +return true; |
| 160 | + } |
| 161 | +//Get configuration for the new CPU frequency |
| 162 | +if(!rtc_clk_cpu_freq_mhz_to_config(cpu_freq_mhz, &conf)){ |
| 163 | +log_e("CPU clock could not be set to %u MHz", cpu_freq_mhz); |
| 164 | +return false; |
| 165 | + } |
| 166 | +//Current APB |
| 167 | +capb=calculateApb(&cconf); |
| 168 | +//New APB |
| 169 | +apb=calculateApb(&conf); |
| 170 | +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); |
| 171 | +//Call peripheral functions before the APB change |
| 172 | +if(apb_change_callbacks){ |
| 173 | +triggerApbChangeCallback(APB_BEFORE_CHANGE, capb, apb); |
| 174 | + } |
| 175 | +//Make the frequency change |
| 176 | +rtc_clk_cpu_freq_set_config_fast(&conf); |
| 177 | +if(capb!=apb){ |
| 178 | +//Update REF_TICK (uncomment if REF_TICK is different than 1MHz) |
| 179 | +//if(conf.freq_mhz < 80){ |
| 180 | +// ESP_REG(APB_CTRL_XTAL_TICK_CONF_REG) = conf.freq_mhz / (REF_CLK_FREQ / MHZ) - 1; |
| 181 | +//} |
| 182 | +//Update APB Freq REG |
| 183 | +rtc_clk_apb_freq_update(apb); |
| 184 | +//Update esp_timer divisor |
| 185 | +esp_timer_impl_update_apb_freq(apb / MHZ); |
| 186 | + } |
| 187 | +//Update FreeRTOS Tick Divisor |
| 188 | +uint32_tfcpu= (conf.freq_mhz >= 80)?(conf.freq_mhz*MHZ):(apb); |
| 189 | +_xt_tick_divisor=fcpu / XT_TICK_PER_SEC; |
| 190 | +//Call peripheral functions after the APB change |
| 191 | +if(apb_change_callbacks){ |
| 192 | +triggerApbChangeCallback(APB_AFTER_CHANGE, capb, apb); |
| 193 | + } |
| 194 | +return true; |
| 195 | +} |
| 196 | + |
| 197 | +uint32_tgetCpuFrequencyMhz(){ |
| 198 | +rtc_cpu_freq_config_tconf; |
| 199 | +rtc_clk_cpu_freq_get_config(&conf); |
| 200 | +returnconf.freq_mhz; |
| 201 | +} |
| 202 | + |
| 203 | +uint32_tgetXtalFrequencyMhz(){ |
| 204 | +returnrtc_clk_xtal_freq_get(); |
| 205 | +} |
| 206 | + |
| 207 | +uint32_tgetApbFrequency(){ |
| 208 | +rtc_cpu_freq_config_tconf; |
| 209 | +rtc_clk_cpu_freq_get_config(&conf); |
| 210 | +returncalculateApb(&conf); |
| 211 | +} |
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