PWM output

PS_repository/demo/demo_mcu_I2C/README.md

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+# Demo-mcu-I2C
+
+- Using Logic Analyzer to detect I2C data
+
+***
+
+### How to implement
+- Burn the program into Flash through Openocd.:
+-			(gdb) monitor program mbed-os-example-blinky.bin
+- Hardware reset：
+-			（gdb）monitor reset init
+- GDB debugging
+
+### The result
+- The resulting is as follows
+- ![avatar](/I/gitwenjian/readmepicuture/1.png)

PS_repository/demo/demo_mcu_I2C/main.cpp

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+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+//#include "stats_report.h"
+
+I2C i2c(PTA11 , PTA12);//I2C_SDA=PTA11,I2C_SCL=PTA12
+int main() 
+{
+    char cmd[2];
+    while (1) 
+    {
+        cmd[0] = 0x01;
+        cmd[1] = 0x00;
+        // read and write takes the 8-bit version of the address.
+        // set up configuration register (at 0x01)
+        i2c.write(0x00, cmd, 2);
+        wait(0.1);
+        // read temperature register
+        cmd[0] = 0x00;
+        i2c.write(0x00, cmd, 1);
+    }
+}

PS_repository/demo/demo_mcu_SPI/README.md

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+# Demo-mcu-SPI
+
+- Using Logic Analyzer to detect SPI data
+
+***
+
+### How to implement
+- Burn the program into Flash through Openocd.:
+-			(gdb) monitor program mbed-os-example-blinky.bin
+- Hardware reset：
+-			（gdb）monitor reset init
+- GDB debugging
+
+### The result
+- The resulting pwm waveform diagram is as follows
+- ![avatar](/I:/gitwenjian/readmepicture/2.png)

PS_repository/demo/demo_mcu_SPI/main.cpp

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+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+
+SPI spi(PTA16, PTA17, PTA15); // mosi, miso, sclk 
+DigitalOut cs(PTA14);
+int main() {
+    // Chip must be deselected
+    cs = 1;
+    // Setup the spi for 8 bit data, high steady state clock,
+    // second edge capture, with a 1MHz clock rate
+    spi.format(8,3);
+    spi.frequency(1000000); 
+    // Select the device by seting chip select low
+    cs = 0; 
+    // Send 0x8f, the command to read the WHOAMI register
+    spi.write(0x8F); 
+    // Send a dummy byte to receive the contents of the WHOAMI register
+    int whoami = spi.write(0x00);
+    // Deselect the device
+    cs = 1;
+}

PS_repository/demo/demo_mcu_pwm/.gitignore

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+.build
+.mbed
+projectfiles
+*.py*

PS_repository/demo/demo_mcu_pwm/main.cpp

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+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+#include "stats_report.h"
+
+PwmOut pwm1(PTB0);
+int main()
+{
+    pwm1.period(4.0f);
+        //pwm1 = 0.5;
+    pwm1.write(0.5f);    
+    while(1);  
+}

PS_repository/demo/demo_mcu_pwm/readme.md

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+# Demo-mcu-pwm
+
+- Pwm output
+
+***
+
+### How to implement
+- Burn the program into Flash through Openocd.:
+-			(gdb) monitor program mbed-os-example-blinky.bin
+- Hardware reset：
+-			（gdb）monitor reset init
+- GDB debugging
+
+### The result
+- The resulting pwm waveform diagram is as follows
+- http://note.youdao.com/noteshare?id=3ee2ea689fe8607ad82c66d5448f6cc9&sub=SVR4F5942405AD3400AB5FA0ACF82FF4F44

PS_repository/demo/demo_mcu_pwm/stats_report.h

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+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef STATS_REPORT_H
+#define STATS_REPORT
+
+#include "mbed.h"
+
+/**
+ *  System Reporting library. Provides runtime information on device:
+ *      - CPU sleep, idle, and wake times
+ *      - Heap and stack usage
+ *      - Thread information
+ *      - Static system information
+ */
+class SystemReport {
+    mbed_stats_heap_t   heap_stats;
+    mbed_stats_cpu_t    cpu_stats;
+    mbed_stats_sys_t    sys_stats;
+
+    mbed_stats_thread_t *thread_stats;
+    uint8_t   thread_count;
+    uint8_t   max_thread_count;
+    uint32_t  sample_time_ms;
+
+public:
+    /**
+     *  SystemReport - Sample rate in ms is required to handle the CPU percent awake logic
+     */
+    SystemReport(uint32_t sample_rate) : max_thread_count(8), sample_time_ms(sample_rate)
+    {
+        thread_stats = new mbed_stats_thread_t[max_thread_count];
+
+        // Collect the static system information
+        mbed_stats_sys_get(&sys_stats);
+
+        printf("=============================== SYSTEM INFO  ================================\r\n");
+        printf("Mbed OS Version: %ld \r\n", sys_stats.os_version);
+        printf("CPU ID: 0x%lx \r\n", sys_stats.cpu_id);
+        printf("Compiler ID: %d \r\n", sys_stats.compiler_id);
+        printf("Compiler Version: %ld \r\n", sys_stats.compiler_version);
+
+        for (int i = 0; i < MBED_MAX_MEM_REGIONS; i++) {
+            if (sys_stats.ram_size[i] != 0) {
+                printf("RAM%d: Start 0x%lx Size: 0x%lx \r\n", i, sys_stats.ram_start[i], sys_stats.ram_size[i]);
+            }
+        }
+        for (int i = 0; i < MBED_MAX_MEM_REGIONS; i++) {
+            if (sys_stats.rom_size[i] != 0) {
+                printf("ROM%d: Start 0x%lx Size: 0x%lx \r\n", i, sys_stats.rom_start[i], sys_stats.rom_size[i]);
+            }
+        }
+    }
+
+    ~SystemReport(void)
+    {
+        free(thread_stats);
+    }
+
+    /**
+     *  Report on each Mbed OS Platform stats API
+     */
+    void report_state(void)
+    {
+        report_cpu_stats();
+        report_heap_stats();
+        report_thread_stats();
+
+        // Clear next line to separate subsequent report logs
+        printf("\r\n");
+    }
+
+    /**
+     *  Report CPU idle and awake time in terms of percentage
+     */
+    void report_cpu_stats(void)
+    {
+        static uint64_t prev_idle_time = 0;
+
+        printf("================= CPU STATS =================\r\n");
+
+        // Collect and print cpu stats
+        mbed_stats_cpu_get(&cpu_stats);
+
+        uint64_t diff = (cpu_stats.idle_time - prev_idle_time);
+        uint8_t idle = (diff * 100) / (sample_time_ms * 1000);  // usec;
+        uint8_t usage = 100 - ((diff * 100) / (sample_time_ms * 1000));  // usec;;
+        prev_idle_time = cpu_stats.idle_time;
+
+        printf("Idle: %d%% Usage: %d%% \r\n", idle, usage);
+    }
+
+    /**
+     *  Report current heap stats. Current heap refers to the current amount of
+     *  allocated heap. Max heap refers to the highest amount of heap allocated
+     *  since reset.
+     */
+    void report_heap_stats(void)
+    {
+        printf("================ HEAP STATS =================\r\n");
+
+        // Collect and print heap stats
+        mbed_stats_heap_get(&heap_stats);
+
+        printf("Current heap: %lu\r\n", heap_stats.current_size);
+        printf("Max heap size: %lu\r\n", heap_stats.max_size);
+    }
+
+    /**
+     *  Report active thread stats
+     */
+    void report_thread_stats(void)
+    {
+        printf("================ THREAD STATS ===============\r\n");
+
+        // Collect and print running thread stats
+        int count = mbed_stats_thread_get_each(thread_stats, max_thread_count);
+
+        for (int i = 0; i < count; i++) {
+            printf("ID: 0x%lx \r\n",        thread_stats[i].id);
+            printf("Name: %s \r\n",         thread_stats[i].name);
+            printf("State: %ld \r\n",       thread_stats[i].state);
+            printf("Priority: %ld \r\n",    thread_stats[i].priority);
+            printf("Stack Size: %ld \r\n",  thread_stats[i].stack_size);
+            printf("Stack Space: %ld \r\n", thread_stats[i].stack_space);
+        }
+    }
+};
+
+#endif // STATS_REPORT_H