📄 f12x_emif_ab1.c
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//-----------------------------------------------------------------------------
// F12x_EMIF_AB1.c
//-----------------------------------------------------------------------------
// Copyright 2005 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// This program configures the external memory interface to read and write
// to an external SRAM (AB1).
//
// Pinout:
//
// P0.0 - UART1 TX
// P0.1 - UART1 RX
//
// P4.4 - RAM_CS (RAM Chip Select)
// P4.5 - RAM_BANK (RAM Bank Select)
// P4.6 - /RD (EMIF)
// P4.7 - /WR (EMIF)
//
// P5, P6, P7 used for EMIF
//
// all other port pins unused
//
// How To Test:
//
// 1) Load the F12x_EMIF_AB1.c in the Silicon Laboratories IDE.
// 2) Connect the AB1 board to the 'F12x TB (with jumper in place on AB1).
// 3) Verify UART jumpers are in place (J6 and J9).
// 4) Connect a serial cable from the DB9 connector on the 'F12x TB to the PC.
// 5) Open Hyperterminal (or a similar program) and connect to the board with
// <BAUDRATE> and 8-N-1.
// 6) Compile and download code to a the 'F12x TB.
// 7) Run the code.
// 8) Verify the UART displays correct results in Hyperterminal.
//
//
// Target: C8051F12x
// Tool chain: KEIL C51 7.20 / KEIL EVAL C51
// Command Line: None
//
// Release 1.0
// -Initial Revision (TP)
// -16 OCT 2007
//
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <C8051F120.h> // SFR declarations
#include <stdio.h>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F36x
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define SYSCLK 24500000 // SYSCLK frequency in Hz
#define BAUDRATE 115200 // Baud rate of UART in bps
#define RAM_SIZE 1024
sbit RAM_BANK = P4^5; // Bank select bit is P4^5
sbit RAM_CS = P4^4; // Chip select bit is P3^3
sbit LED = P1^6; // LED = 1 means ON
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void UART1_Init (void);
void EMIF_Init (void);
//-----------------------------------------------------------------------------
// Global VARIABLES
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void)
{
unsigned char xdata *pchar; // Memory access pointer
unsigned long i;
WDTCN = 0xDE; // Disable Watchdog timer
WDTCN = 0xAD;
PORT_Init(); // Initialize Port I/O
SYSCLK_Init (); // Initialize Oscillator
UART1_Init (); // Initialize UART0
EMIF_Init (); // Initialize memory interface
SFRPAGE = CONFIG_PAGE; // P4 is on SFR Page F
RAM_BANK = 0; // Select lower bank
RAM_CS = 0; // Assert RAM chip select
SFRPAGE = LEGACY_PAGE;
// Clear xdata space
pchar = 0x4000;
for (i = 0; i < RAM_SIZE; i++) {
*pchar++ = 0;
// Print status to UART0
if ((i % 16) == 0) {
printf ("\nwriting 0x%04x: %02x ", (unsigned) i, (unsigned) 0);
} else {
printf ("%02x ", (unsigned) 0);
}
}
// Verify all are zero
pchar = 0x4000;
for (i = 0; i < RAM_SIZE; i++) {
if (*pchar != 0) {
printf ("Erase error!\n");
while (1);
}
// Print status to UART0
if ((i % 16) == 0) {
printf ("\nverifying 0x%04x: %02x ", (unsigned) i, (unsigned) *pchar);
} else {
printf ("%02x ", (unsigned) *pchar);
}
pchar++;
}
// Write xdata space
pchar = 0x4000;
for (i = 0; i < RAM_SIZE; i++) {
*pchar = ~i;
// Print status to UART0
if ((i % 16) == 0) {
printf ("\nwriting 0x%04x: %02x ", (unsigned) i, (unsigned) ((~i) & 0xff));
} else {
printf ("%02x ", (unsigned) ((~i) & 0xff));
}
pchar++;
}
// Verify
pchar = 0x4000;
for (i = 0; i < RAM_SIZE; i++) {
if (*pchar != ((~i) & 0xff)) {
printf ("Verify error!\n");
while (1);
}
// Print status to UART0
if ((i % 16) == 0) {
printf ("\nverifying 0x%04x: %02x ", (unsigned) i, (unsigned) *pchar);
} else {
printf ("%02x ", (unsigned) *pchar);
}
pchar++;
}
printf ("\n\nTest complete.");
while (1);
}
//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// Configure the Crossbar and GPIO ports.
//
// P0.0 - UART1 TX (push-pull)
// P0.1 - UART1 RX
//
// P4.4 - RAM_CS (RAM Chip Select) (push-pull)
// P4.5 - RAM_BANK (RAM Bank Select) (push-pull)
// P4.6 - /RD (EMIF) (push-pull)
// P4.7 - /WR (EMIF) (push-pull)
//
// P5, P6, P7 used for EMIF (push-pull)
//
// all other port pins unused
//
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
unsigned char SFRPAGE_save = SFRPAGE; // Save the current SFRPAGE
SFRPAGE = CONFIG_PAGE; // Switch to the necessary SFRPAGE
XBR2 = 0x44; // Enable UART1 on P0.0(TX) and P0.1(RX)
// Enable crossbar and enable
// weak pull-ups
P0MDOUT |= 0x01; // Enable UTX as push-pull output
P1MDOUT |= 0x40; // Enable LED as push-pull output
// EMIF Initializations
P4MDOUT |= 0xF0; // /WR, /RD, RAM_CS, and RAM_BANK are
// push-pull
P5MDOUT |= 0xFF;
P6MDOUT |= 0xFF;
P7MDOUT |= 0xFF;
SFRPAGE = SFRPAGE_save; // Restore the SFRPAGE
}
//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// This routine initializes the system clock to use the internal oscillator
// at its maximum frequency.
//
// Also enables the Missing Clock Detector and VDD monitor as reset sources.
//
//-----------------------------------------------------------------------------
void SYSCLK_Init (void)
{
unsigned char SFRPAGE_save = SFRPAGE; // Save the current SFRPAGE
SFRPAGE = CONFIG_PAGE; // Switch to the necessary SFRPAGE
OSCICN |= 0x03; // Configure internal oscillator for
// its maximum frequency
RSTSRC = 0x06; // Enable missing clock detector
// and VDD monitor as reset sources
SFRPAGE = SFRPAGE_save; // Restore the SFRPAGE
}
//-----------------------------------------------------------------------------
// UART1_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// Configure the UART1 using Timer1, for <baudrate> and 8-N-1.
//
//-----------------------------------------------------------------------------
void UART1_Init (void)
{
char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page
SFRPAGE = UART1_PAGE;
SCON1 = 0x10; // SCON1: mode 0, 8-bit UART, enable RX
SFRPAGE = TIMER01_PAGE;
TMOD &= ~0xF0;
TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit reload
if (SYSCLK/BAUDRATE/2/256 < 1) {
TH1 = -(SYSCLK/BAUDRATE/2);
CKCON |= 0x10; // T1M = 1; SCA1:0 = xx
} else if (SYSCLK/BAUDRATE/2/256 < 4) {
TH1 = -(SYSCLK/BAUDRATE/2/4);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x01; // T1M = 0; SCA1:0 = 01
} else if (SYSCLK/BAUDRATE/2/256 < 12) {
TH1 = -(SYSCLK/BAUDRATE/2/12);
CKCON &= ~0x13; // T1M = 0; SCA1:0 = 00
} else {
TH1 = -(SYSCLK/BAUDRATE/2/48);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x02; // T1M = 0; SCA1:0 = 10
}
TL1 = TH1; // Initialize Timer1
TR1 = 1; // Start Timer1
SFRPAGE = UART1_PAGE;
TI1 = 1; // Indicate TX1 ready
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//-----------------------------------------------------------------------------
// EMIF_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// Configure the external memory interface to non-multiplexed split-mode
// with bank select.
//
//-----------------------------------------------------------------------------
void EMIF_Init (void)
{
unsigned char SFRPAGE_save = SFRPAGE; // Save the current SFRPAGE
SFRPAGE = EMI0_PAGE; // Switch to the necessary SFRPAGE
EMI0CF = 0x38; // Non-muxed mode; split mode with bank
// select
EMI0CN = 0x40; // Access addresses on page 0x4000 for
// 8-bit XRAM moves
SFRPAGE = SFRPAGE_save; // Restore the SFRPAGE
}
//-----------------------------------------------------------------------------
// Support Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// putchar
//-----------------------------------------------------------------------------
//
// Copyright KEIL ELEKTRONIK GmbH 1990 - 2002
//
// putchar (basic version): expands '\n' into CR LF
//
//-----------------------------------------------------------------------------
char putchar (char c)
{
char SFRPAGE_SAVE = SFRPAGE;
SFRPAGE = UART1_PAGE;
if (c == '\n') // If carriage return
{
while (!TI0);
TI0 = 0;
SBUF0 = 0x0d; // Output CR
}
while (!TI0); // Wait for transmit complete
TI0 = 0;
SBUF0 = c; // Send character
SFRPAGE = SFRPAGE_SAVE;
return c;
}
//-----------------------------------------------------------------------------
// End Of File
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