# HG changeset patch
# User Michiel Broek <mbroek@mbse.eu>
# Date 1697826592 -7200
# Node ID 053649608c09538b31df2709de1cbcf33951275e
# Parent  86b275481021cc21aa7f497b16d286c589363e7b
Begin coding transmit bits.

diff -r 86b275481021 -r 053649608c09 main/dcf77tx.h
--- a/main/dcf77tx.h	Fri Oct 20 15:57:56 2023 +0200
+++ b/main/dcf77tx.h	Fri Oct 20 20:29:52 2023 +0200
@@ -30,6 +30,7 @@
 #include "esp_wpa2.h"
 #include "esp_netif_sntp.h"
 #include "esp_sntp.h"
+#include "esp_timer.h"
 #include "nvs_flash.h"
 
 
diff -r 86b275481021 -r 053649608c09 main/task_dcf.c
--- a/main/task_dcf.c	Fri Oct 20 15:57:56 2023 +0200
+++ b/main/task_dcf.c	Fri Oct 20 20:29:52 2023 +0200
@@ -13,6 +13,15 @@
 SemaphoreHandle_t               xSemaphoreDCF = NULL;		///< Semaphore DCF task.
 EventGroupHandle_t              xEventGroupDCF;			///< Events DCF task.
 DCF_State			*dcf_state = NULL;		///< Public state for other tasks.
+esp_timer_handle_t		timerHandle;			///< Timer handler
+int				impulseCount = 0;		///< 100 mSec transmit slices.
+int8_t				impulseArray[61];		///< Pulses, 0 = no pulse, 1=100ms, 2=200ms
+int				actualSecond = 0;		///< Current second to transmit.
+time_t				dcf_now;			///< Current time to send.
+struct tm			dcf_tm;				///< Local broken down time.
+								///
+extern bool			System_TimeOk;
+
 
 #define LED1			CONFIG_LED1_PIN
 #define	LED2			CONFIG_LED2_PIN
@@ -33,6 +42,100 @@
 
 void request_DCF(bool run)
 {
+    ESP_LOGI(TAG, "request_DCF(%s)", run ? "start":"stop");
+
+    if (run)
+	xEventGroupSetBits(xEventGroupDCF, TASK_DCF_REQUEST_START);
+    else
+	xEventGroupSetBits(xEventGroupDCF, TASK_DCF_REQUEST_STOP);
+}
+
+
+int bin2bcd(int data)
+{
+    int	msb, lsb;
+
+    if (data < 10)
+	return data;
+    msb = (data / 10) << 4;
+    lsb = data % 10;
+    return msb + lsb;
+}
+
+
+static void DCFout(void* arg);
+void DCFout(void* arg)
+{
+    int		i, tmp, parity;
+
+    switch (impulseCount++) {
+	case 0:		if (actualSecond == 0) {
+			    time(&dcf_now);
+			    dcf_now += 60;
+			}
+			if (impulseArray[actualSecond] != 0) {
+			    gpio_set_level(CONFIG_LED1_PIN, 1);
+			}
+			break;
+	case 1:		if (impulseArray[actualSecond] == 1) {
+			    gpio_set_level(CONFIG_LED1_PIN, 0);
+			}
+			break;
+	case 2:		gpio_set_level(CONFIG_LED1_PIN, 0);
+			break;
+	case 9:		impulseCount = 0;
+    			/*
+    			 * To spread the CPU load, we set all bits during the first seconds
+    			 * because we don't use these bits.
+    			 */
+    			switch (actualSecond) {
+			    case 0:	/* the first 20 bits of each minute at a logical zero value */
+				    	for (i = 0; i < 20; i++)
+					    impulseArray[i] = 1;
+					break;
+			    case 1:	localtime_r(&dcf_now, &dcf_tm);
+					char strftime_buf[64];
+					strftime(strftime_buf, sizeof(strftime_buf), "%c", &dcf_tm);
+					ESP_LOGI(TAG, "The current date/time to send is: %s", strftime_buf);
+					break;
+			    case 2:	/* DST bits */
+					if (dcf_tm.tm_isdst == 0) {
+					    impulseArray[17] = 1;
+					    impulseArray[18] = 2;
+					} else {
+					    impulseArray[17] = 2;
+					    impulseArray[18] = 1;
+					}
+					/* bit 20 must be 1 to indicate active time */
+					impulseArray[20] = 2;
+					break;
+			    case 3:	int minute = bin2bcd(dcf_tm.tm_min);
+					parity = 0;
+					for (i = 21; i < 28; i++) {
+					    tmp = minute & 1;
+					    impulseArray[i] = tmp + 1;
+					    parity += tmp;
+					    minute >>= 1;
+					}
+					impulseArray[28] = (parity & 1) ? 2:1;
+					ESP_LOGI(TAG, "minute %d%d%d%d%d%d%d %d", impulseArray[21], impulseArray[22], impulseArray[23],
+							impulseArray[24], impulseArray[25], impulseArray[26], impulseArray[27], impulseArray[28]);
+					break;
+
+
+    			}
+			if (actualSecond < 59)	/* Can include leap second */
+                            actualSecond++;
+                        break;
+    }
+
+    if (actualSecond >= 59) {
+	time_t	now = time(NULL);
+	localtime_r(&now, &dcf_tm);
+	if (dcf_tm.tm_sec == 0) {
+	    actualSecond = impulseCount = 0;
+	}
+    }
 }
 
 
@@ -51,6 +154,16 @@
     gpio_set_direction(LED1, GPIO_MODE_OUTPUT);
     gpio_set_direction(LED2, GPIO_MODE_OUTPUT);
 
+    esp_timer_create_args_t timerDCF = {
+        .callback = &DCFout,
+        .name = "DCF timer"
+    };
+    esp_timer_create(&timerDCF, &timerHandle);
+
+    for (int i = 0; i < 59; i++)
+	impulseArray[i] = 1;
+    impulseArray[59] = impulseArray[60] = 0;
+
     xEventGroupClearBits(xEventGroupDCF, TASK_DCF_RUN);
     EventBits_t uxBits;
 
@@ -60,11 +173,16 @@
 	if (uxBits & TASK_DCF_REQUEST_START) {
 	    if (dcf_state->DCF_running) {
 		/* Already running */
-		xEventGroupClearBits(xEventGroupDCF, TASK_DCF_REQUEST_START);
+	    } else {
+		actualSecond = 0;
+		impulseCount = 0;
+	    	esp_timer_start_periodic(timerHandle, 100000);
+		dcf_state->DCF_running = true;
 	    }
+	    xEventGroupClearBits(xEventGroupDCF, TASK_DCF_REQUEST_START);
 
 	} else if (uxBits & TASK_DCF_REQUEST_STOP) {
-
+	    esp_timer_stop(timerHandle);
 	}
     } /* for(;;) */
 }