とりあえずmbedの成功例。
// mbed(LPC1768) gba serial port(color)
// p1-0V 6-GND (blue)
// p5-mosi 3-SI (orange)
// p6-miso 2-SO (red)
// p7-sck 5-SC (green)
#include "mbed.h"
LocalFileSystem local("local");
Serial pc(USBTX, USBRX);
SPI spi(p5, p6, p7);
int main(void)
{
spi.format(16, 3);
spi.frequency(100000);
uint16_t w1, w2;
uint32_t w, r;
pc.printf("Looking for GBA\n");
do
{
w = 0x00006202;
w1 = w >> 16;
w2 = w & 0xffff;
r = spi.write(w1) << 16;
r = spi.write(w2) | r;
pc.printf("r:0x%08x\n", r);
wait(0.01);
} while(r != 0x72026202);
pc.printf("Found GBA!\n");
}■実行ログ
GBAはブートが完了してタイトルロゴが表示されている状態。mbedのリセットボタンを押した後のログ。
Looking for GBA r:0x00000000 r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0xffffffff r:0x00000000 r:0x72026202 Found GBA!
■ロジアナ
r:0x00000000
r:0x72026202
普通ですよねー。
