From 6035a17b2becc788c0daaf440deb6cc37d364029 Mon Sep 17 00:00:00 2001
From: Leo C
Date: Mon, 8 Sep 2014 19:54:08 +0200
Subject: Programmable Z180 clock, clock command

---
 avr/cmd_boot.c | 49 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 9 deletions(-)

(limited to 'avr/cmd_boot.c')

diff --git a/avr/cmd_boot.c b/avr/cmd_boot.c
index 3e2dcdb..58c4f56 100644
--- a/avr/cmd_boot.c
+++ b/avr/cmd_boot.c
@@ -44,13 +44,13 @@ command_ret_t do_loadf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
 {
 	(void) cmdtp; (void) flag; (void) argc; (void) argv;
 
-	if (z80_bus_state() & ZST_RUNNING) {	
+	if (z80_bus_state() & ZST_RUNNING) {
 		printf_P(PSTR("## Can't load while CPU is running!\n"));
-		return CMD_RET_FAILURE;	
+		return CMD_RET_FAILURE;
 	}
 
 	z80_load_mem();
-	
+
 	return CMD_RET_SUCCESS;
 }
 
@@ -61,7 +61,7 @@ command_ret_t do_busreq_pulse(cmd_tbl_t *cmdtp, int flag, int argc, char * const
 
 	(void) cmdtp; (void) flag;
 
-	if (!(z80_bus_state() & ZST_RUNNING)) {	
+	if (!(z80_bus_state() & ZST_RUNNING)) {
 		printf_P(PSTR("## CPU is not running!\n"));
 		return CMD_RET_FAILURE;
 	}
@@ -82,7 +82,7 @@ command_ret_t do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	uint32_t addr;
 
 	(void) cmdtp; (void) flag;
-	
+
 	if (argc < 2)
 		return CMD_RET_USAGE;
 	addr = strtoul(argv[1], NULL, 16);
@@ -91,9 +91,9 @@ command_ret_t do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			"   (Out of logical address space (0x00000-0x0ffff))\n"),
 			addr);
 		return CMD_RET_FAILURE;
-	} 
+	}
 
-	if (z80_bus_state() & ZST_RUNNING) {	
+	if (z80_bus_state() & ZST_RUNNING) {
 		printf_P(PSTR("## CPU allready running!\n"));
 		return CMD_RET_FAILURE;
 	}
@@ -103,7 +103,7 @@ command_ret_t do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (addr != 0) {
 		uint8_t tmp[3];
 		uint_fast8_t i;
-		
+
 		z80_bus_cmd(Request);
 		for (i = 0; i < 3; i++)
 			tmp[i] = z80_read(i);
@@ -118,7 +118,7 @@ command_ret_t do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			z80_write(i, tmp[i]);
 	} else
 		z80_bus_cmd(Run);
-		
+
 	z80_bus_cmd(Release);
 
 	return CMD_RET_SUCCESS;
@@ -143,3 +143,34 @@ command_ret_t do_restart(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
 	return CMD_RET_SUCCESS;
 }
 
+
+command_ret_t do_clock(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	uint32_t freq;
+
+	(void) cmdtp; (void) flag;
+
+	if (argc == 2) {
+		freq = strtoul(argv[1], NULL, 10);
+		if (freq == 0) {
+			printf_P(PSTR("CPU clock cannot be 0\n"));
+			return CMD_RET_USAGE;
+		}
+
+		if (freq > F_CPU / 2) {
+			printf_P(PSTR("Max CPU clock freq. is: %luHz\n"), F_CPU/2);
+			return CMD_RET_USAGE;
+		}
+
+		if (z80_clock_set(freq) < 0) {
+			printf_P(PSTR("Setting CPU clock freq. to %luHz failed.\n"),
+						freq);
+		}
+	}
+
+	printf_P(PSTR("CPU clock: %luHz\n"), z80_clock_get());
+
+
+	return CMD_RET_SUCCESS;
+}
+
-- 
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