AKI-H8: Old but not forgotten

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Sep 232010
 
AKI-H8: Old but not forgotten

There is no actual use for it, but it promised back when I bought it, to be much fun. It is my only Ethernet connected microcontroller board (10BaseT only though, but still…) and the board comes with a large amount of RAM (2MB).

Since I nearly forgot how to use it, I better write this down here. I already have RedBoot installed (downloaded from here).

Connection details are: 38400 bps, 1 start and 1 stop bit, no flow control.

+DP83902A - eeprom ESA: 00:02:cb:01:a1:7d
... waiting for BOOTP information
Ethernet eth0: MAC address 00:02:cb:01:a1:7d
Can't get BOOTP info for device!

RedBoot(tm) bootstrap and debug environment [ROM]
Non-certified release, version UNKNOWN - built 21:28:57, Apr 11 2004

Platform: Akizuki H8/3068 Network micom (H8/300H)
Copyright (C) 2000, 2001, 2002, Red Hat, Inc.

RAM: 0x00400000-0x005f4000, [0x00400000-0x005e1000] available
FLASH: 0x00000000 - 0x00080000, 8 blocks of 0x00010000 bytes each.

To Set IP address:


RedBoot> ip_address -l 192.168.11.55/24 -h 192.168.11.53
IP: 192.168.11.55/255.255.255.0, Gateway: 0.0.0.0
Default server: 192.168.11.53

.53 is the tftp server to use later. .55 is the assigned IP address of the H8 board.

To load a file via tftp:

RedBoot> load lcd_clock.elf
Using default protocol (TFTP)
Entry point: 0x00400000, address range: 0x003fff8c-0x0040add0

The program is from http://uclinux.quake4.jp/uClinux/Chapter5/lcd_clock.elf. Then execute it via


RedBoot> exec 0x00400000
Now booting linux kernel:
Entry Address 0x00400000
Cmdline :

And on the LCD you should see a clock starting at 00:00:00, increasing 1 per second.

Notable issue: If the LCD shows nothing or the board does not power on, turn J1 (Vdd/Vss). Some LCD need one setting, some another one. The original display needs 1-3 and 2-4 connected, another display I have needs 1-2 and 3-4 connected.

And here the main program including how to set an interrupt vector:

#include 
#include 

#include "h8_sample.h"
#include "h8_lcd.h"

static unsigned char buffer[16] = "";
static int counter = 0;

static unsigned char hour = 0;
static unsigned char minute = 0;
static unsigned char sec = 0;

void Set_Vector( int num, void *vect )
{
	void **vvt;
	vvt = (void **)0x00FFFD20;
	void *jv = 0x5A000000 + vect;
	vvt[num] = jv;
}


//
// 8ビットタイマー初期化（100ms）
//
void Init_Timer8(void)
{
	T8TCR0.BIT.CKS   = 0;	// クロック一時停止
	T8TCR0.BIT.CMIEB = 0;	// CMFBによる割り込み禁止
	T8TCR0.BIT.CMIEA = 0;	// CMFAによる割り込み禁止
	T8TCR0.BIT.OVIE  = 0;	// OVFによる割り込み禁止
	T8TCR0.BIT.CCLR  = 1;	// コンペアマッチAでクリア
	
	T8TCR1.BIT.CKS   = 4;	// 8TCNT0コンペアマッチAでカウント
	T8TCR1.BIT.CMIEB = 0;	// CMFBによる割り込み禁止
	T8TCR1.BIT.CMIEA = 1;	// CMFAによる割り込み許可
	T8TCR1.BIT.OVIE  = 0;	// OVFによる割り込み禁止
	T8TCR1.BIT.CCLR  = 1;	// コンペアマッチAでクリア
	
	T8TCSR0.BYTE	 = 0;	// クリア
	T8TCSR1.BYTE	 = 0;	// クリア
	
	T8TCNT = 0;				// カウンタクリア
	T8TCORA0 = 249;			// 20,000,000 / 64 / 250 = 1250
	T8TCORA1 = 124;			// 1250 / 125 = 10Hz (100ms)
	
	T8TCR0.BIT.CKS	 = 2;	// 内部クロック20MHz φ/64
}


//
// 8ビットタイマーチャンネル0
// コンペアマッチA1/B1割り込み
//
#pragma interrupt
void int_cmiab1(void)
{
	T8TCSR1.BIT.CMFA = 0;	// コンペアマッチフラグAクリア
	counter++;
	if( counter > 9 ) {
		counter = 0;
		if( ++sec > 59 ) {
			sec = 0;
			if( ++minute > 59 ) {
				minute = 0;
				if( ++hour > 23 ) {
					hour = 0;
				}
			}
		}
	}
}


int main()
{
	Set_Vector( 38, int_cmiab1 );

	ABWCR.BYTE = 0xFF;	// バス8ビットモードに設定
	wait20us();
	
	P4DDR.BYTE = 0xFF;	// PORT4 = OUTPUT
	wait20us();
	
	P5DDR.BYTE = 0x00;	// PORT5下位4ビット入力
	wait20us();
	P5PCR.BYTE = 0x0F;	// プルアップ
	
	LCD_Init();
	
	hour = 0;
	minute = 0;
	sec = 0;
	counter = 0;
	Init_Timer8();
	
	_sti();				// 割り込み許可
	while(1) {
		int i;
		for( i = 0 ; i < 5 ; i++ ) {
			sprintf(buffer, "%02d:%02d:%02d" ,hour, minute, sec);
			LCD_Locate(0,0);
			LCD_Putstr(buffer);
			wait(100);
		}
		if( ! P5DR.BIT.B0 ) {
			if( ++hour > 23 ) hour = 0;
		}
		if( ! P5DR.BIT.B1 ) {
			if( ++minute > 59 ) minute = 0;
		}
		if( ! P5DR.BIT.B2 ) sec = 0;
		if( ! P5DR.BIT.B3 ) break;
	}
	return 0;
}