Adding Hello World Example Runing from Internal SRAM and NAND

2025-04-21 12:27:27 +03:00 · 2010-03-25 09:46:50 -05:00
parent 710061371d
commit f692458b69
23 changed files with 10594 additions and 0 deletions
--- a/Examples/hello_sram/build/jz_serial.c
+++ b/Examples/hello_sram/build/jz_serial.c
@@ -0,0 +1,115 @@
+/*
+ * Jz47xx UART support
+ *
+ * Options hardcoded to 8N1
+ *
+ *  Copyright (c) 2009, yajin <yajin@vm-kernel.org>
+ *  Copyright (c) 2005 - 2008, Ingenic Semiconductor Inc.
+ *  Ingenic Semiconductor, <jlwei@ingenic.cn>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#include <jz4740.h>
+#include <board.h>
+
+#undef UART_BASE
+#ifndef CFG_UART_BASE
+#define UART_BASE  UART0_BASE
+#else
+#define UART_BASE  CFG_UART_BASE
+#endif
+
+/******************************************************************************
+*
+* serial_init - initialize a channel
+*
+* This routine initializes the number of data bits, parity
+* and set the selected baud rate. Interrupts are disabled.
+* Set the modem control signals if the option is selected.
+*
+* RETURNS: N/A
+*/
+
+static void serial_setbrg(void)
+{
+    volatile u8 *uart_lcr = (volatile u8 *) (UART_BASE + OFF_LCR);
+    volatile u8 *uart_dlhr = (volatile u8 *) (UART_BASE + OFF_DLHR);
+    volatile u8 *uart_dllr = (volatile u8 *) (UART_BASE + OFF_DLLR);
+    u32 baud_div, tmp;
+
+    baud_div = CFG_EXTAL / 16 / CONFIG_BAUDRATE;
+    tmp = *uart_lcr;
+    tmp |= UART_LCR_DLAB;
+    *uart_lcr = tmp;
+
+    *uart_dlhr = (baud_div >> 8) & 0xff;
+    *uart_dllr = baud_div & 0xff;
+
+    tmp &= ~UART_LCR_DLAB;
+    *uart_lcr = tmp;
+}
+
+int serial_init(void)
+{
+    volatile u8 *uart_fcr = (volatile u8 *) (UART_BASE + OFF_FCR);
+    volatile u8 *uart_lcr = (volatile u8 *) (UART_BASE + OFF_LCR);
+    volatile u8 *uart_ier = (volatile u8 *) (UART_BASE + OFF_IER);
+    volatile u8 *uart_sircr = (volatile u8 *) (UART_BASE + OFF_SIRCR);
+
+    /* Disable port interrupts while changing hardware */
+    *uart_ier = 0;
+
+    /* Disable UART unit function */
+    *uart_fcr = ~UART_FCR_UUE;
+
+    /* Set both receiver and transmitter in UART mode (not SIR) */
+    *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE);
+
+    /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
+    *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1;
+
+    /* Set baud rate */
+    serial_setbrg();
+
+    /* Enable UART unit, enable and clear FIFO */
+    *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS;
+
+    return 0;
+}
+
+void serial_putc(const char c)
+{
+    volatile u8 *uart_lsr = (volatile u8 *) (UART_BASE + OFF_LSR);
+    volatile u8 *uart_tdr = (volatile u8 *) (UART_BASE + OFF_TDR);
+
+    if (c == '\n')
+        serial_putc('\r');
+
+    /* Wait for fifo to shift out some bytes */
+    while (!((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60));
+
+    *uart_tdr = (u8) c;
+}
+
+void serial_puts(const char *s)
+{
+    while (*s)
+    {
+        serial_putc(*s++);
+    }
+}