wemosでアセンブラ

概要

wemos　d1でアセンブラやってみた。

サンプルコード

extern "C" {
    #include "ets_sys.h"
    #include "osapi.h"
    #include "gpio.h"
    #include "user_interface.h"
}
byte YELLOW_pin = 4;
byte BLUE_pin = 12;
void toggle_blue_yellow__asm()
// yellow pin = 4  => bit mask = 16d, [0...0]10000 (32 bit)
// blue pin   = 12 => bit mask = 4096d, [0...0]1 0000 0000 0000 (32 bit)
// PIN_OUT_SET   : 0x60000304
// PIN_OUT_CLEAR : 0x60000308
//
{
    asm volatile (
    "movi    a2, 0x60000304;" // SET Address in a2
    "movi    a3, 0x60000308;" // CLEAR Address in a3
    "movi    a4, 16;"         // yellow pin bit mask in a4
    "movi    a5, 4096;"       // blue pin bit mask in a5
    "movi    a6, 12;"         // delay loop counter
    "s32i    a4, a3, 0;"      // set yellow to LOW
    "memw;"
    "s32i    a5, a2, 0;"      // set blue to HIGH
    "memw;"
    "label1:"
    "addi    a6, a6, -1;"
    "NOP;"
    "NOP;"
    "NOP;"
    "NOP;"
    "bnez    a6, label1;"
    "movi    a6, 12;"         // delay loop counter
    "s32i    a4, a2, 0;"      // set yellow to HIGH
    "memw;"
    "s32i    a5, a3, 0;"      // set blue to LOW
    "memw;"
    "label2:"
    "addi    a6, a6, -1;"
    "NOP;"
    "NOP;"
    "NOP;"
    "NOP;"
    "bnez    a6, label2;"
    "movi    a6, 12;"         // delay loop counter
    "s32i    a4, a3, 0;"      // set yellow to LOW
    "memw;"
    "s32i    a5, a3, 0;"      // set blue to LOW
    "memw;"
    "label3:"
    "addi    a6, a6, -1;"
    "NOP;"
    "NOP;"
    "NOP;"
    "NOP;"
    "bnez    a6, label3;"
    "movi    a6, 12;"         // delay loop counter
    "s32i    a4, a2, 0;"      // set yellow to HIGH
    "memw;"
    "s32i    a5, a2, 0;"      // set blue to HIGH
    "memw;"
    "label4:"
    "addi    a6, a6, -1;"
    "NOP;"
    "NOP;"
    "NOP;"
    "NOP;"
    "bnez    a6, label4;"
    ::
    : "a2", "a3", "a4", "a5", "a6", "memory"
    );
}
void setup()
{
    pinMode(YELLOW_pin, OUTPUT_OPEN_DRAIN);
    pinMode(BLUE_pin, OUTPUT_OPEN_DRAIN);
}
void loop()
{
    delay(10);
    toggle_blue_yellow__asm();
}

以上。