refactor using GPtimer

cores/esp32/esp32-hal-timer.c

@@ -13,261 +13,145 @@
 // limitations under the License.
 
 #include "esp32-hal-timer.h"
-#include "driver/timer.h"
+#include "driver/gptimer.h"
 #include "soc/soc_caps.h"
+#include "clk_tree.h"
 
-typedef union {
-    struct {
-        uint32_t reserved0:   10;
-        uint32_t alarm_en:     1;             /*When set  alarm is enabled*/
-        uint32_t level_int_en: 1;             /*When set  level type interrupt will be generated during alarm*/
-        uint32_t edge_int_en:  1;             /*When set  edge type interrupt will be generated during alarm*/
-        uint32_t divider:     16;             /*Timer clock (T0/1_clk) pre-scale value.*/
-        uint32_t autoreload:   1;             /*When set  timer 0/1 auto-reload at alarming is enabled*/
-        uint32_t increase:     1;             /*When set  timer 0/1 time-base counter increment. When cleared timer 0 time-base counter decrement.*/
-        uint32_t enable:       1;             /*When set timer 0/1 time-base counter is enabled*/
-    };
-    uint32_t val;
-} timer_cfg_t;
-
-#define NUM_OF_TIMERS   SOC_TIMER_GROUP_TOTAL_TIMERS
-
-typedef struct hw_timer_s
-{
-    uint8_t group;
-    uint8_t num;
-} hw_timer_t;
-
-// Works for all chips
-static hw_timer_t timer_dev[4] = {
-    {0,0}, {1,0},  {0,1},  {1,1}
-};
-
-// NOTE: (in IDF 5.0 there wont be need to know groups/numbers 
-// timer_init() will list thru all timers and return free timer handle)
-
-
-inline uint64_t timerRead(hw_timer_t *timer){
+inline uint64_t timerRead(hw_timer_t timer_handle){
 
     uint64_t value;
-    timer_get_counter_value(timer->group, timer->num,&value);
+    gptimer_get_raw_count(timer_handle, &value);
     return value;
 }
-
-uint64_t timerAlarmRead(hw_timer_t *timer){
-    uint64_t value;
-    timer_get_alarm_value(timer->group, timer->num, &value);
-    return value;
-}
-
-void timerWrite(hw_timer_t *timer, uint64_t val){
-    timer_set_counter_value(timer->group, timer->num, val);
-}
-
-void timerAlarmWrite(hw_timer_t *timer, uint64_t alarm_value, bool autoreload){
-    timer_set_alarm_value(timer->group, timer->num, alarm_value);
-    timerSetAutoReload(timer,autoreload);
-}
-
-void timerSetConfig(hw_timer_t *timer, uint32_t config){
-    timer_cfg_t cfg;
-    cfg.val = config;
-    timer_set_alarm(timer->group, timer->num, cfg.alarm_en);
-    timerSetDivider(timer,cfg.divider);
-    timerSetAutoReload(timer,cfg.autoreload);
-    timerSetCountUp(timer, cfg.increase);
-
-    if (cfg.enable) {
-        timerStart(timer);
-    }
-    else{
-        timerStop(timer);
-    }
-    return;
-}
-
-uint32_t timerGetConfig(hw_timer_t *timer){
-    timer_config_t timer_cfg;
-    timer_get_config(timer->group, timer->num,&timer_cfg);
-
-    //Translate to default uint32_t
-    timer_cfg_t cfg;
-    cfg.alarm_en = timer_cfg.alarm_en;
-    cfg.autoreload = timer_cfg.auto_reload;
-    cfg.divider = timer_cfg.divider;
-    cfg.edge_int_en = timer_cfg.intr_type;
-    cfg.level_int_en = !timer_cfg.intr_type;
-    cfg.enable = timer_cfg.counter_en;
-    cfg.increase = timer_cfg.counter_dir;
-
-    return cfg.val;
-}
-
-void timerSetCountUp(hw_timer_t *timer, bool countUp){
-    timer_set_counter_mode(timer->group, timer->num,countUp);
-}
-
-bool timerGetCountUp(hw_timer_t *timer){
-    timer_cfg_t config;
-    config.val = timerGetConfig(timer);
-    return config.increase;
-}
-
-void timerSetAutoReload(hw_timer_t *timer, bool autoreload){
-    timer_set_auto_reload(timer->group, timer->num,autoreload);
-}
-
-bool timerGetAutoReload(hw_timer_t *timer){
-    timer_cfg_t config;
-    config.val= timerGetConfig(timer);
-    return config.autoreload;
-}
-
-// Set divider from 2 to 65535
-void timerSetDivider(hw_timer_t *timer, uint16_t divider){
-    if(divider < 2)
-    {
-        log_e("Timer divider must be set in range of 2 to 65535");
-        return;
-    }
-    timer_set_divider(timer->group, timer->num,divider);
-}
-
-uint16_t timerGetDivider(hw_timer_t *timer){
-    timer_cfg_t config;
-    config.val = timerGetConfig(timer);
-    return config.divider;
-}
-
-void timerStart(hw_timer_t *timer){
-    timer_start(timer->group, timer->num);
+void timerWrite(hw_timer_t timer_handle, uint64_t val){
+    gptimer_set_raw_count(timer_handle, val);
 }
 
-void timerStop(hw_timer_t *timer){
-    timer_pause(timer->group, timer->num);
-}
-
-void timerRestart(hw_timer_t *timer){
-    timerWrite(timer,0);
+void timerAlarmWrite(hw_timer_t timer, uint64_t alarm_value, bool autoreload, uint64_t reload_count){
+    esp_err_t err = ESP_OK;
+    gptimer_alarm_config_t alarm_cfg = {
+        .alarm_count = alarm_value,
+        .reload_count = reload_count,
+        .flags.auto_reload_on_alarm = autoreload,
+    };
+    err = gptimer_set_alarm_action(timer, &alarm_cfg);
+    if (err != ESP_OK){
+        log_e("Timer Alarm Write failed, error num=%d", err);
+    } 
 }
 
-bool timerStarted(hw_timer_t *timer){
-    timer_cfg_t config;
-    config.val = timerGetConfig(timer);
-    return config.enable;
+uint32_t timerGetResolution(hw_timer_t timer_handle){
+    uint32_t resolution;
+    gptimer_get_resolution(timer_handle, &resolution);
+    return resolution;
 }
 
-void timerAlarmEnable(hw_timer_t *timer){
-    timer_set_alarm(timer->group, timer->num,true);
+void timerStart(hw_timer_t timer_handle){
+    gptimer_start(timer_handle);
 }
 
-void timerAlarmDisable(hw_timer_t *timer){
-    timer_set_alarm(timer->group, timer->num,false);
+void timerStop(hw_timer_t timer_handle){
+    gptimer_stop(timer_handle);
 }
 
-bool timerAlarmEnabled(hw_timer_t *timer){
-    timer_cfg_t config;
-    config.val = timerGetConfig(timer);
-    return config.alarm_en;
+void timerRestart(hw_timer_t timer_handle){
+    gptimer_set_raw_count(timer_handle,0);
 }
 
-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){
-        timerStop(timer);
-    } else {
-        old_apb /= 1000000;
-        new_apb /= 1000000;
-        uint16_t divider = (new_apb * timerGetDivider(timer)) / old_apb;
-        timerSetDivider(timer,divider);
-        timerStart(timer);
+hw_timer_t timerBegin(uint32_t resolution, bool countUp){
+
+    esp_err_t err = ESP_OK;
+    hw_timer_t timer_handle;
+    uint32_t counter_src_hz = 0;
+    uint32_t divider = 0;
+    soc_periph_gptimer_clk_src_t clk;
+
+    soc_periph_gptimer_clk_src_t gptimer_clks[] = SOC_GPTIMER_CLKS;
+    for (size_t i = 0; i < sizeof(gptimer_clks) / sizeof(gptimer_clks[0]); i++){
+        clk = gptimer_clks[i];
+        clk_tree_src_get_freq_hz(clk, CLK_TREE_SRC_FREQ_PRECISION_CACHED, &counter_src_hz);
+        divider = counter_src_hz / resolution;
+        if((divider >= 2) && (divider <= 65536)){
+            break;
+        }
+        else divider = 0;
     }
-}
 
-hw_timer_t * timerBegin(uint8_t num, uint16_t divider, bool countUp){
-    if(num >= NUM_OF_TIMERS)
-    {
-        log_e("Timer number %u exceeds available number of Timers.", num);
+    if(divider == 0){
+        log_e("Resolution cannot be reached with any clock source, aborting!");
         return NULL;
     }
 
-    hw_timer_t * timer = &timer_dev[num];   //Get Timer group/num from 0-3 number
-
-    timer_config_t config = {
-            .divider = divider,
-            .counter_dir = countUp,
-            .counter_en = TIMER_PAUSE,
-            .alarm_en = TIMER_ALARM_DIS,
-            .auto_reload = false,
+    gptimer_config_t config = {
+            .clk_src = clk,
+            .direction = countUp,
+            .resolution_hz = resolution,
+            .flags.intr_shared = true,
         };
 
-    timer_init(timer->group, timer->num, &config);
-    timer_set_counter_value(timer->group, timer->num, 0);
-    timerStart(timer);
-    addApbChangeCallback(timer, _on_apb_change);
-    return timer;
+    err = gptimer_new_timer(&config, &timer_handle);
+    if (err != ESP_OK){
+        log_e("Failed to create a new GPTimer, error num=%d", err);
+        return NULL;
+    } 
+    gptimer_enable(timer_handle);
+    gptimer_start(timer_handle);
+    return timer_handle;
 }
 
-void timerEnd(hw_timer_t *timer){
-    removeApbChangeCallback(timer, _on_apb_change);
-    timer_deinit(timer->group, timer->num);
+void timerEnd(hw_timer_t timer_handle){
+    esp_err_t err = ESP_OK;
+    gptimer_disable(timer_handle);
+    err = gptimer_del_timer(timer_handle);
+    if (err != ESP_OK){
+        log_e("Failed to destroy GPTimer, error num=%d", err);
+    } 
 }
 
-bool IRAM_ATTR timerFnWrapper(void *arg){
+bool IRAM_ATTR timerFnWrapper(hw_timer_t timer, const gptimer_alarm_event_data_t *edata, void *arg){
     void (*fn)(void) = arg;
     fn();
 
     // some additional logic or handling may be required here to approriately yield or not
     return false;
 }
 
-void timerAttachInterruptFlag(hw_timer_t *timer, void (*fn)(void), bool edge, int intr_alloc_flags){
-    if(edge){
-        log_w("EDGE timer interrupt is not supported! Setting to LEVEL...");
-    }
-    timer_isr_callback_add(timer->group, timer->num, timerFnWrapper, fn, intr_alloc_flags);
-}
+void timerAttachInterrupt(hw_timer_t timer, void (*fn)(void)){
+    esp_err_t err = ESP_OK;
+    gptimer_event_callbacks_t cbs = {
+        .on_alarm = timerFnWrapper,
+    };
 
-void timerAttachInterrupt(hw_timer_t *timer, void (*fn)(void), bool edge){
-    timerAttachInterruptFlag(timer, fn, edge, 0);
+    gptimer_disable(timer);
+    err = gptimer_register_event_callbacks(timer, &cbs, fn);
+    if (err != ESP_OK){
+        log_e("Timer Attach Interrupt failed, error num=%d", err);
+    } 
+    gptimer_enable(timer);
 }
 
-void timerDetachInterrupt(hw_timer_t *timer){
-    timer_isr_callback_remove(timer->group, timer->num);
+void timerDetachInterrupt(hw_timer_t timer){
+    esp_err_t err = ESP_OK;
+    err = gptimer_set_alarm_action(timer, NULL);
+    if (err != ESP_OK){
+        log_e("Timer Detach Interrupt failed, error num=%d", err);
+    } 
 }
 
-uint64_t timerReadMicros(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 / (getApbFrequency() / 1000000);
+    uint32_t resolution = timerGetResolution(timer);
+    return timer_val * 1000000 / resolution;
 }
 
-uint64_t timerReadMilis(hw_timer_t *timer){
+uint64_t timerReadMilis(hw_timer_t timer){
     uint64_t timer_val = timerRead(timer);
-    uint16_t div = timerGetDivider(timer);
-    return timer_val * div / (getApbFrequency() / 1000);
+    uint32_t resolution = timerGetResolution(timer);
+    return timer_val * 1000 / resolution;
 }
 
-double timerReadSeconds(hw_timer_t *timer){
+double timerReadSeconds(hw_timer_t timer){
     uint64_t timer_val = timerRead(timer);
-    uint16_t div = timerGetDivider(timer);
-    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 / (getApbFrequency() / 1000000);
-}
-
-uint64_t timerAlarmReadMilis(hw_timer_t *timer){
-    uint64_t timer_val = timerAlarmRead(timer);
-    uint16_t div = timerGetDivider(timer);
-    return timer_val * div / (getApbFrequency() / 1000);
-}
-
-double timerAlarmReadSeconds(hw_timer_t *timer){
-    uint64_t timer_val = timerAlarmRead(timer);
-    uint16_t div = timerGetDivider(timer);
-    return (double)timer_val * div / getApbFrequency();
+    uint32_t resolution = timerGetResolution(timer);
+    return (double)timer_val / resolution;
 }