Merge pull request #15 from linlingao/f_blinky-baremetal

Added Baremetal-Blinky example

Author: Amanda Butler

Baremetal-Blinky/README.md

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+## Baremetal Blinky example using Mbed OS
+
+This guide reviews the steps required to build and run a baremetal Blinky application on TI's CC3220SF LaunchXL platform without using DigitalOut class and timers.
+
+Please install [Mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli).
+
+This example retrieves code from https://github.com/ARMmbed/mbed-os-ti-port. It's a private repo; please contact [email protected] to request access.
+
+### Import the example application
+
+From the command-line, import the example:
+
+```
+git clone https://github.com/ARMmbed/mbed-os-examples-docs_only.git
+cd Baremetal-Blinky
+mbed config root .
+mbed deploy
+```
+
+#### Now compile
+
+
+```
+mbed compile -m cc3220sf -t gcc_arm 
+```
+
+#### Program your board
+
+1. Connect your Mbed device to the computer over USB.
+2. Copy the binary file to the Mbed device.
+3. Observe the red LED blinking.
+

Baremetal-Blinky/main.cpp

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+#include "mbed.h"
+
+// Port A0: 0x40004000 GPIO0 to GPIO7
+// Port A1: 0x40005000 GPIO8 to GPIO15 Use GPIO13 (SW2) as input, GPIO9(D10 Red) as output
+// Port A2: 0x40006000 GPIO16 to GPIO23
+// Port A3: 0x40007000 GPIO24 to GPIO31
+
+#define WAIT_CYCLES_LONG          10000000
+#define WAIT_CYCLES_SHORT         1000000
+#define INPUT_PIN_PORTA1          5
+#define OUTPUT_PIN_PORTA1         1
+#define GPIO_PORTA1_ADDRESS       0x40005000
+#define GPIO_PAD_CONFIG_9_ADDRESS 0x4402E0C4
+#define OFFSET_DIR                0x400
+#define OFFSET_DATA               0
+#define ARCM_BASE                 0x44025000
+#define PRCM_RUN_MODE_CLK         0x00000001
+#define PRCM_SLP_MODE_CLK         0x00000100
+#define GPIO_PAD_CONFIG_9         0x4402E0C4
+#define PAD_MODE_MASK             0x0000000F
+
+static void set_gpio_dir()
+{
+    // Configure direction Bit 7:0 DIR, 0 = input, 1 = output
+    *((volatile unsigned long*)(GPIO_PORTA1_ADDRESS + OFFSET_DIR)) &= ~0x20; // Configure SW2 as input
+    *((volatile unsigned long*)(GPIO_PORTA1_ADDRESS + OFFSET_DIR)) |= 0x2;   // Configure D10 as output
+
+}
+
+static const unsigned long g_ulPinToPadMap[64] =
+{
+    10,11,12,13,14,15,16,17,255,255,18,
+    19,20,21,22,23,24,40,28,29,25,255,
+    255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,
+    31,255,255,255,255,0,255,32,30,255,1,
+    255,2,3,4,5,6,7,8,9
+};
+
+void PinModeSet(unsigned long ulPin,unsigned long ulPinMode)
+{
+    unsigned long ulPad;
+
+    // Get the corresponding Pad
+    ulPad = g_ulPinToPadMap[ulPin & 0x3F];
+
+    // Calculate the register address
+    ulPad = ((ulPad << 2) + (0x4402E000+0x000000A0));
+
+    // Set the mode.
+    *((volatile unsigned long*)(ulPad)) = (((*((volatile unsigned long*)(ulPad))) & ~PAD_MODE_MASK) |  ulPinMode) & ~(3<<10);
+}
+
+int main()
+{
+    PinModeSet(0x0000003F,0x000000000);
+    *((volatile unsigned long*)(ARCM_BASE + 0x58)) |= PRCM_RUN_MODE_CLK || PRCM_SLP_MODE_CLK;
+
+    unsigned long wait_cycles_in_use = WAIT_CYCLES_SHORT;
+    volatile unsigned long delay = 0;
+
+    set_gpio_dir();
+    *((volatile unsigned long*)(GPIO_PAD_CONFIG_9))|= 0x220;
+
+    while (true)
+    {
+
+        // Check if SW2 is pressed
+        if (*(volatile unsigned long *)(GPIO_PORTA1_ADDRESS + OFFSET_DATA + ((1 << INPUT_PIN_PORTA1) << 2)))
+        {
+            wait_cycles_in_use = WAIT_CYCLES_LONG;
+        }
+
+        *(volatile unsigned long *)(GPIO_PORTA1_ADDRESS + OFFSET_DATA + ((1 << OUTPUT_PIN_PORTA1) << 2)) = (OUTPUT_PIN_PORTA1 << 1);
+        delay = wait_cycles_in_use;
+        while (delay--);
+        *(volatile unsigned long *)(GPIO_PORTA1_ADDRESS + OFFSET_DATA + ((1 << OUTPUT_PIN_PORTA1) << 2)) = 0;
+        delay = wait_cycles_in_use;
+        while (delay--);
+    }
+}
+

Baremetal-Blinky/mbed-os.lib

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+https://github.com/ARMmbed/mbed-os-ti-port/#1304ebdb5e8d1e6d13aabe1360813b75f58c0828