×
start.S源码：
.global _start
_start:
ldr sp, =0xD0030000 // 初始化栈，因为后面要调用C函数
bl clock_init // 初始化时钟
bl ddr_init // 初始化内存
bl nand_init // 初始化NAND
ldr r0, =0x36000000 // 要拷贝到DDR中的位置
ldr r1, =0x0 // 从NAND的0地址开始拷贝
ldr r2, =bss_start // BSS段的开始地址
sub r2,r2,r0 // 要拷贝的大小
bl nand_read // 拷贝数据
clean_bss:
ldr r0, =bss_start
ldr r1, =bss_end
mov r3, #0
cmp r0, r1
ldreq pc, =on_ddr
clean_loop:
str r3, [r0], #4
cmp r0, r1
bne clean_loop
ldr pc, =on_ddr
on_ddr:
ldr sp, =0x3f000000 // 重新初始化栈，指向内存
ldr pc, =main
=================================================================
clock.c源码：
#define APLL_CON (*(volatile unsigned int *)0xe0100100)
#define CLK_SRC0 (*(volatile unsigned int *)0xe0100200)
#define CLK_DIV0 (*(volatile unsigned int *)0xe0100300)
#define MPLL_CON (*(volatile unsigned int *)0xe0100108)
void clock_init(void)
{
// 设置时钟为:
// ARMCLK=1000MHz, HCLKM=200MHz, HCLKD=166.75MHz
// HCLKP =133.44MHz, PCLKM=100MHz, PCLKD=83.375MHz,
// PCLKP =66.7MHz
// SDIV[2:0] : S = 1
// PDIV[13:8] : P = 0x3
// MDIV[25:16]: M = 0x7d
// LOCKED [29]: 1 = 使能锁
// ENABLE [31]: 1 = 使能APLL控制器
// 得出FoutAPLL = 500MHz
APLL_CON = (1<<31)|(1<<29)|(0x7d<<16)|(0x3<<8)|(1<<0);
// 时钟源的设置
// APLL_SEL[0] :1 = FOUTAPLL
// MPLL_SEL[4] :1 = FOUTMPLL
// EPLL_SEL[8] :1 = FOUTEPLL
// VPLL_SEL[12]:1 = FOUTVPLL
// MUX_MSYS_SEL[16]:0 = SCLKAPLL
// MUX_DSYS_SEL[20]:0 = SCLKMPLL
// MUX_PSYS_SEL[24]:0 = SCLKMPLL
// ONENAND_SEL [28]:1 = HCLK_DSYS
CLK_SRC0 = (1<<28)|(1<<12)|(1<<8)|(1<<4)|(1<<0);
// 设置分频系数
// APLL_RATIO[2:0]: APLL_RATIO = 0x0
// A2M_RATIO [6:4]: A2M_RATIO = 0x4
// HCLK_MSYS_RATIO[10:8]: HCLK_MSYS_RATIO = 0x4
// PCLK_MSYS_RATIO[14:12]:PCLK_MSYS_RATIO = 0x1
// HCLK_DSYS_RATIO[19:16]:HCLK_DSYS_RATIO = 0x3
// PCLK_DSYS_RATIO[22:20]:PCLK_DSYS_RATIO = 0x1
// HCLK_PSYS_RATIO[27:24]:HCLK_PSYS_RATIO = 0x4
// PCLK_PSYS_RATIO[30:28]:PCLK_PSYS_RATIO = 0x1
CLK_DIV0 = (0x1<<28)|(0x4<<24)|(0x1<<20)|(0x3<<16)|(0x1<<12)|(0x4<<8)|(0x4<<4);
// SDIV[2:0] : S = 1
// PDIV[13:8] : P = 0xc
// MDIV[25:16]: M = 0x29b
// VSEL [27]: 0
// LOCKED [29]: 1 = 使能锁
// ENABLE [31]: 1 = 使能MPLL控制器
// 得出FoutAPLL = 667MHz
APLL_CON = (1<<31)|(1<<29)|(0x29d<<16)|(0xc<<8)|(1<<0);
}
====================================================================
mem_setup.S源码：
// SDRAM Controller
#define APB_DMC_0_BASE 0xF0000000
#define APB_DMC_1_BASE 0xF1400000
#define ASYNC_MSYS_DMC0_BASE 0xF1E00000
#define ELFIN_GPIO_BASE 0xE0200000
// MemControl BL=4, 1Chip, DDR2 Type, dynamic self refresh, force precharge, dynamic power down off
#define DMC0_MEMCONTROL 0x00202400
// MemConfig0 256MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
#define DMC0_MEMCONFIG_0 0x20E00323
#define DMC0_MEMCONFIG_1 0x00E00323 // MemConfig1
#define DMC0_TIMINGA_REF 0x00000618 // TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
#define DMC0_TIMING_ROW 0x2B34438A // TimingRow for @200MHz
#define DMC0_TIMING_DATA 0x24240000 // TimingData CL=3
#define DMC0_TIMING_PWR 0x0BDC0343 // TimingPower
#define DMC1_MEMCONTROL 0x00202400 // MemControl BL=4, 2 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
#define DMC1_MEMCONFIG_0 0x40F00313 // MemConfig0 512MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
#define DMC1_MEMCONFIG_1 0x00F00313 // MemConfig1
#define DMC1_TIMINGA_REF 0x00000618 // TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
#define DMC1_TIMING_ROW 0x2B34438A // TimingRow for @200MHz
#define DMC1_TIMING_DATA 0x24240000 // TimingData CL=3
#define DMC1_TIMING_PWR 0x0BDC0343 // TimingPower
#define MP1_0DRV_SR_OFFSET 0x3CC
#define MP1_1DRV_SR_OFFSET 0x3EC
#define MP1_2DRV_SR_OFFSET 0x40C
#define MP1_3DRV_SR_OFFSET 0x42C
#define MP1_4DRV_SR_OFFSET 0x44C
#define MP1_5DRV_SR_OFFSET 0x46C
#define MP1_6DRV_SR_OFFSET 0x48C
#define MP1_7DRV_SR_OFFSET 0x4AC
#define MP1_8DRV_SR_OFFSET 0x4CC
#define MP2_0DRV_SR_OFFSET 0x4EC
#define MP2_1DRV_SR_OFFSET 0x50C
#define MP2_2DRV_SR_OFFSET 0x52C
#define MP2_3DRV_SR_OFFSET 0x54C
#define MP2_4DRV_SR_OFFSET 0x56C
#define MP2_5DRV_SR_OFFSET 0x58C
#define MP2_6DRV_SR_OFFSET 0x5AC
#define MP2_7DRV_SR_OFFSET 0x5CC
#define MP2_8DRV_SR_OFFSET 0x5EC
#define DMC_CONCONTROL 0x00
#define DMC_MEMCONTROL 0x04
#define DMC_MEMCONFIG0 0x08
#define DMC_MEMCONFIG1 0x0C
#define DMC_DIRECTCMD 0x10
#define DMC_PRECHCONFIG 0x14
#define DMC_PHYCONTROL0 0x18
#define DMC_PHYCONTROL1 0x1C
#define DMC_RESERVED 0x20
#define DMC_PWRDNCONFIG 0x28
#define DMC_TIMINGAREF 0x30
#define DMC_TIMINGROW 0x34
#define DMC_TIMINGDATA 0x38
#define DMC_TIMINGPOWER 0x3C
#define DMC_PHYSTATUS 0x40
#define DMC_CHIP0STATUS 0x48
#define DMC_CHIP1STATUS 0x4C
#define DMC_AREFSTATUS 0x50
#define DMC_MRSTATUS 0x54
#define DMC_PHYTEST0 0x58
#define DMC_PHYTEST1 0x5C
#define DMC_QOSCONTROL0 0x60
#define DMC_QOSCONFIG0 0x64
#define DMC_QOSCONTROL1 0x68
#define DMC_QOSCONFIG1 0x6C
#define DMC_QOSCONTROL2 0x70
#define DMC_QOSCONFIG2 0x74
#define DMC_QOSCONTROL3 0x78
#define DMC_QOSCONFIG3 0x7C
#define DMC_QOSCONTROL4 0x80
#define DMC_QOSCONFIG4 0x84
#define DMC_QOSCONTROL5 0x88
#define DMC_QOSCONFIG5 0x8C
#define DMC_QOSCONTROL6 0x90
#define DMC_QOSCONFIG6 0x94
#define DMC_QOSCONTROL7 0x98
#define DMC_QOSCONFIG7 0x9C
#define DMC_QOSCONTROL8 0xA0
#define DMC_QOSCONFIG8 0xA4
#define DMC_QOSCONTROL9 0xA8
#define DMC_QOSCONFIG9 0xAC
#define DMC_QOSCONTROL10 0xB0
#define DMC_QOSCONFIG10 0xB4
#define DMC_QOSCONTROL11 0xB8
#define DMC_QOSCONFIG11 0xBC
#define DMC_QOSCONTROL12 0xC0
#define DMC_QOSCONFIG12 0xC4
#define DMC_QOSCONTROL13 0xC8
#define DMC_QOSCONFIG13 0xCC
#define DMC_QOSCONTROL14 0xD0
#define DMC_QOSCONFIG14 0xD4
#define DMC_QOSCONTROL15 0xD8
#define DMC_QOSCONFIG15 0xDC
// SDRAM Controller
#define APB_DMC_0_BASE 0xF0000000
#define APB_DMC_1_BASE 0xF1400000
#define ASYNC_MSYS_DMC0_BASE 0xF1E00000
#define DMC_CONCONTROL 0x00
#define DMC_MEMCONTROL 0x04
#define DMC_MEMCONFIG0 0x08
#define DMC_MEMCONFIG1 0x0C
#define DMC_DIRECTCMD 0x10
#define DMC_PRECHCONFIG 0x14
#define DMC_PHYCONTROL0 0x18
#define DMC_PHYCONTROL1 0x1C
#define DMC_RESERVED 0x20
#define DMC_PWRDNCONFIG 0x28
#define DMC_TIMINGAREF 0x30
#define DMC_TIMINGROW 0x34
#define DMC_TIMINGDATA 0x38
#define DMC_TIMINGPOWER 0x3C
#define DMC_PHYSTATUS 0x40
#define DMC_CHIP0STATUS 0x48
#define DMC_CHIP1STATUS 0x4C
#define DMC_AREFSTATUS 0x50
#define DMC_MRSTATUS 0x54
#define DMC_PHYTEST0 0x58
#define DMC_PHYTEST1 0x5C
#define DMC_QOSCONTROL0 0x60
#define DMC_QOSCONFIG0 0x64
#define DMC_QOSCONTROL1 0x68
#define DMC_QOSCONFIG1 0x6C
#define DMC_QOSCONTROL2 0x70
#define DMC_QOSCONFIG2 0x74
#define DMC_QOSCONTROL3 0x78
#define DMC_QOSCONFIG3 0x7C
#define DMC_QOSCONTROL4 0x80
#define DMC_QOSCONFIG4 0x84
#define DMC_QOSCONTROL5 0x88
#define DMC_QOSCONFIG5 0x8C
#define DMC_QOSCONTROL6 0x90
#define DMC_QOSCONFIG6 0x94
#define DMC_QOSCONTROL7 0x98
#define DMC_QOSCONFIG7 0x9C
#define DMC_QOSCONTROL8 0xA0
#define DMC_QOSCONFIG8 0xA4
#define DMC_QOSCONTROL9 0xA8
#define DMC_QOSCONFIG9 0xAC
#define DMC_QOSCONTROL10 0xB0
#define DMC_QOSCONFIG10 0xB4
#define DMC_QOSCONTROL11 0xB8
#define DMC_QOSCONFIG11 0xBC
#define DMC_QOSCONTROL12 0xC0
#define DMC_QOSCONFIG12 0xC4
#define DMC_QOSCONTROL13 0xC8
#define DMC_QOSCONFIG13 0xCC
#define DMC_QOSCONTROL14 0xD0
#define DMC_QOSCONFIG14 0xD4
#define DMC_QOSCONTROL15 0xD8
#define DMC_QOSCONFIG15 0xDC
.globl ddr_init
ddr_init:
// DMC0 Drive Strength (Setting 2X)
ldr r0, =ELFIN_GPIO_BASE
ldr r1, =0x0000AAAA
str r1, [r0, #0x3cc]
str r1, [r0, #MP1_0DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_1DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_2DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_3DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_4DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_5DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_6DRV_SR_OFFSET]
ldr r1, =0x0000AAAA
str r1, [r0, #MP1_7DRV_SR_OFFSET]
ldr r1, =0x00002AAA
str r1, [r0, #MP1_8DRV_SR_OFFSET]
// DMC0 initialization at single Type
ldr r0, =APB_DMC_0_BASE
ldr r1, =0x00101000 @PhyControl0 DLL parameter setting, manual 0x00101000
str r1, [r0, #DMC_PHYCONTROL0]
ldr r1, =0x00000086 @PhyControl1 DLL parameter setting, LPDDR/LPDDR2 Case
str r1, [r0, #DMC_PHYCONTROL1]
ldr r1, =0x00101002 @PhyControl0 DLL on
str r1, [r0, #DMC_PHYCONTROL0]
ldr r1, =0x00101003 @PhyControl0 DLL start
str r1, [r0, #DMC_PHYCONTROL0]
find_lock_val:
ldr r1, [r0, #DMC_PHYSTATUS] @Load Phystatus register value
and r2, r1, #0x7
cmp r2, #0x7 @Loop until DLL is locked
bne find_lock_val
and r1, #0x3fc0
mov r2, r1, LSL #18
orr r2, r2, #0x100000
orr r2 ,r2, #0x1000
orr r1, r2, #0x3 @Force Value locking
str r1, [r0, #DMC_PHYCONTROL0]
// setting DDR2
ldr r1, =0x0FFF2010 @ConControl auto refresh off
str r1, [r0, #DMC_CONCONTROL]
ldr r1, =DMC0_MEMCONTROL @MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
str r1, [r0, #DMC_MEMCONTROL]
ldr r1, =DMC0_MEMCONFIG_0 @MemConfig0 256MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
str r1, [r0, #DMC_MEMCONFIG0]
ldr r1, =DMC0_MEMCONFIG_1 @MemConfig1
str r1, [r0, #DMC_MEMCONFIG1]
ldr r1, =0xFF000000 @PrechConfig
str r1, [r0, #DMC_PRECHCONFIG]
ldr r1, =DMC0_TIMINGA_REF @TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
str r1, [r0, #DMC_TIMINGAREF]
ldr r1, =DMC0_TIMING_ROW @TimingRow for @200MHz
str r1, [r0, #DMC_TIMINGROW]
ldr r1, =DMC0_TIMING_DATA @TimingData CL=4
str r1, [r0, #DMC_TIMINGDATA]
ldr r1, =DMC0_TIMING_PWR @TimingPower
str r1, [r0, #DMC_TIMINGPOWER]
ldr r1, =0x07000000 @DirectCmd chip0 Deselect
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x01000000 @DirectCmd chip0 PALL
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00020000 @DirectCmd chip0 EMRS2
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00030000 @DirectCmd chip0 EMRS3
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00010400 @DirectCmd chip0 EMRS1 (MEM DLL on, DQS# disable)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00000542 @DirectCmd chip0 MRS (MEM DLL reset) CL=4, BL=4
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x01000000 @DirectCmd chip0 PALL
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x05000000 @DirectCmd chip0 REFA
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x05000000 @DirectCmd chip0 REFA
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00000442 @DirectCmd chip0 MRS (MEM DLL unreset)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00010780 @DirectCmd chip0 EMRS1 (OCD default)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00010400 @DirectCmd chip0 EMRS1 (OCD exit)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x07100000 @DirectCmd chip1 Deselect
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x01100000 @DirectCmd chip1 PALL
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00120000 @DirectCmd chip1 EMRS2
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00130000 @DirectCmd chip1 EMRS3
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00110400 @DirectCmd chip1 EMRS1 (MEM DLL on, DQS# disable)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00100542 @DirectCmd chip1 MRS (MEM DLL reset) CL=4, BL=4
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x01100000 @DirectCmd chip1 PALL
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x05100000 @DirectCmd chip1 REFA
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x05100000 @DirectCmd chip1 REFA
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00100442 @DirectCmd chip1 MRS (MEM DLL unreset)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00110780 @DirectCmd chip1 EMRS1 (OCD default)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x00110400 @DirectCmd chip1 EMRS1 (OCD exit)
str r1, [r0, #DMC_DIRECTCMD]
ldr r1, =0x0FF02030 @ConControl auto refresh on
str r1, [r0, #DMC_CONCONTROL]
ldr r1, =0xFFFF00FF @PwrdnConfig
str r1, [r0, #DMC_PWRDNCONFIG]
ldr r1, =0x00202400 @MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
str r1, [r0, #DMC_MEMCONTROL]
mov pc, lr
=====================================================================
nand.c源码：
#define NFCONF (*(volatile unsigned int *)0xB0E00000)
#define NFCONT (*(volatile unsigned int *)0xB0E00004)
#define NFCMMD (*(volatile unsigned char *)0xB0E00008)
#define NFADDR (*(volatile unsigned char *)0xB0E0000C)
#define NFDATA (*(volatile unsigned char *)0xB0E00010)
#define NFSTAT (*(volatile unsigned int *)0xB0E00028)
#define MP0_3CON (*(volatile unsigned int *)0xE0200320)
#define MP0_1CON (*(volatile unsigned int *)0xE02002E0)
#define PAGE_SIZE 2048
#define NAND_SECTOR_SIZE_LP 2048
void wait_idle(void)
{
int i;
while(!(NFSTAT&(1<<0)));
for(i=0; i<10; i++);
}
void nand_select_chip(void)
{
int i;
NFCONT &= ~(1<<1);
for(i=0; i<10; i++);
}
void nand_deselect_chip(void)
{
NFCONT |= (1<<1);
}
void write_cmd(int cmd)
{
NFCMMD = cmd;
}
void write_addr(unsigned int addr)
{
int i;
NFADDR = (addr>>0) & 0xFF;
wait_idle();
NFADDR = (addr>>8) & 0x7;
wait_idle();
NFADDR = (addr>>11) & 0xFF;
wait_idle();
NFADDR = (addr>>19) & 0xFF;
wait_idle();
NFADDR = (addr>>27) & 0x1;
wait_idle();
}
unsigned char read_data(void)
{
return NFDATA;
}
static void nand_reset(void)
{
nand_select_chip();
write_cmd(0xff); // 复位命令
wait_idle();
nand_deselect_chip();
}
void nand_init(void)
{
// 设置时间参数(HCLK_PSYS = 667MHz/5 = 133MHz)
// TACLS[15:12]: TACLS = 1 1/133Mhz = 7.5ns
// TWRPH0[11:8]: TWRPH0 = 1 7.5ns * 2 = 15ns
// TWRPH1 [7:4]: TWRPH1 = 1 7.5ns * 2 = 15ns
// AddrCycle[1]: 1 = 指明地址周期为5次，这个是和2440的区别
NFCONF |= 1<<12 | 1<<8 | 1<<4;
NFCONF |= 1<<1;
// 使能NAND控制器
// 关闭片选信号
NFCONT |= (1<<0)|(1<<1);
// 设置相应管脚用于Nand Flash控制器
MP0_3CON = 0x22222222;
// 复位NAND Flash
nand_reset();
return;
}
// 读ID
void nand_read_id(char id[])
{
int i;
nand_select_chip();
write_cmd(0x90);
write_addr(0x00);
for (i = 0; i < 5; i++)
id[i] = read_data();
nand_deselect_chip();
}
// 读一页的函数
void nand_read(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;
// 选中芯片
nand_select_chip();
for(i=start_addr; i < (start_addr + size);)
{
// 发出READ0命令
write_cmd(0);
// Write Address
write_addr(i);
write_cmd(0x30);
wait_idle();
for(j=0; j < NAND_SECTOR_SIZE_LP; j++, i++)
{
*buf = read_data();
buf++;
}
}
// 取消片选信号
nand_deselect_chip();
}
void nand_write(int sdram_addr, int nand_addr, int size)
{
}
=====================================================================
main.c源码：
#include "clock.h"
#include "uart.h"
#include "lib.h"
#include "nand.h"
#include "lcd.h"
int main(void)
{
int i;
uart_init(); // 初始化UART0
wy_printf("LCD initialize ... ");
lcd_init();
while (1)
{
wy_printf("display red ");
lcd_clear_screen(0xff0000);
for(i=50;i>0;i--)
delay();
wy_printf("display green ");
lcd_clear_screen(0x00ff00);
for(i=50;i>0;i--)
delay();
wy_printf("display blue ");
lcd_clear_screen(0x0000ff);
for(i=50;i>0;i--)
delay();
nand_read((unsigned char *)0x3fc00000, 0xC00000, 0x300000);
wy_printf("display girl ");
lcd_draw_bmp(0x3fc00000);
for(i=150;i>0;i--)
delay();
}
return 0;
}
====================================================================
lcd.S源码：
#define GPF0CON (*(volatile unsigned int *)0xE0200120)
#define GPF1CON (*(volatile unsigned int *)0xE0200140)
#define GPF2CON (*(volatile unsigned int *)0xE0200160)
#define GPF3CON (*(volatile unsigned int *)0xE0200180)
#define GPD0CON (*(volatile unsigned int *)0xE02000A0)
#define GPD0DAT (*(volatile unsigned int *)0xE02000A4)
#define CLK_SRC1 (*(volatile unsigned int *)0xe0100204)
#define CLK_DIV1 (*(volatile unsigned int *)0xe0100304)
#define DISPLAY_CONTROL (*(volatile unsigned int *)0xe0107008)
#define VIDCON0 (*(volatile unsigned int *)0xF8000000)
#define VIDCON1 (*(volatile unsigned int *)0xF8000004)
#define VIDTCON2 (*(volatile unsigned int *)0xF8000018)
#define VIDTCON3 (*(volatile unsigned int *)0xF800001c)
#define WINCON0 (*(volatile unsigned int *)0xF8000020)
#define WINCON2 (*(volatile unsigned int *)0xF8000028)
#define SHADOWCON (*(volatile unsigned int *)0xF8000034)
#define VIDOSD0A (*(volatile unsigned int *)0xF8000040)
#define VIDOSD0B (*(volatile unsigned int *)0xF8000044)
#define VIDOSD0C (*(volatile unsigned int *)0xF8000048)
#define VIDW00ADD0B0 (*(volatile unsigned int *)0xF80000A0)
#define VIDW00ADD1B0 (*(volatile unsigned int *)0xF80000D0)
#define VIDW00ADD2 (*(volatile unsigned int *)0xF8000100)
#define VIDTCON0 (*(volatile unsigned int *)0xF8000010)
#define VIDTCON1 (*(volatile unsigned int *)0xF8000014)
#define VSPW 9
#define VBPD 13
#define LINEVAL 479
#define VFPD 21
#define HSPW 19
#define HBPD 25
#define HOZVAL 799
#define HFPD 209
#define LeftTopX 0
#define LeftTopY 0
#define RightBotX 799
#define RightBotY 479
#define FRAME_BUFFER (0x3f000000)
void lcd_init(void)
{
// 1. 设置相关GPIO引脚用于LCD
GPF0CON = 0x22222222; // GPF0[7:0]
GPF1CON = 0x22222222; // GPF1[7:0]
GPF2CON = 0x22222222; // GPF2[7:0]
GPF3CON = 0x22222222; // GPF3[7:0]
// 使能LCD本身
GPD0CON |= 1<<4;
GPD0DAT |= 1<<1;
// 该寄存器是时钟相关
// Display path selection
//10: RGB=FIMD I80=FIMD ITU=FIMD
DISPLAY_CONTROL = 2<<0;
// 2. 初始化210的display controller
// 2.1 hsync,vsync,vclk,vden的极性和时间参数
// 2.2 行数、列数(分辨率),象素颜色的格式
// 2.3 分配显存(frame buffer),写入display controller
// CLKVAL_F[13:6]:该值需要根据LCD手册做相应的修改
// HCLKD=166.75MHz，DCLK(min) = 20ns(50MHz)
// VCLK = 166.75 / (5+1) = 28MHz
// CLKDIR [4]:1 = Divided by CLKVAL_F
// ENVID [1]:1 = Enable the video output and the Display control signal.
// ENVID_F [0]:1 = Enable the video output and the Display control signal.
VIDCON0 &= ~((3<<26) | (1<<18) | (0xff<<6) | (1<<2)); // RGB I/F, RGB Parallel format,
VIDCON0 |= ((5<<6) | (1<<4) );
// 设置极性(该值需要根据LCD手册做相应的修改)
// IVDEN [4]:0 = Normal
// IVSYNC[5]:1 = Inverted
// IHSYNC[6]:1 = Inverted
// IVCLK [7]:0 = Video data is fetched at VCLK falling edge
VIDCON1 &= ~(1<<7); // 在vclk的下降沿获取数据
VIDCON1 |= ((1<<6) | (1<<5)); // HSYNC极性反转, VSYNC极性反转
// 设置时序(需要修改)
VIDTCON0 = (VBPD << 16) | (VFPD << 8) | (VSPW << 0);
VIDTCON1 = (HBPD << 16) | (HFPD << 8) | (HSPW << 0);
// 设置屏幕的大小
// LINEVAL[21:11]:多少行 = 480
// HOZVAL [10:0] :水平大小 = 800
VIDTCON2 = (LINEVAL << 11) | (HOZVAL << 0);
// WSWP_F [15] :1 = Swap Enable(为什么要使能)，很关键的一位，能够解决掉重影问题
// BPPMODE_F[5:2]:1011 = unpacked 24 BPP (non-palletized R:8-G:8-B:8 )
// ENWIN_F [0]: 1 = Enable the video output and the VIDEO control signal.
WINCON0 &= ~(0xf << 2);
WINCON0 |= (0xB<<2)|(1<<15);
// 窗口0，左上角的位置(0,0)
// 窗口0，右下角的位置(800,480)
VIDOSD0A = (LeftTopX<<11) | (LeftTopY << 0);
VIDOSD0B = (RightBotX<<11) | (RightBotY << 0);
// 大小
VIDOSD0C = (LINEVAL + 1) * (HOZVAL + 1);
VIDW00ADD0B0 = FRAME_BUFFER;
// VBASEL = VBASEU + (LINEWIDTH+OFFSIZE) x (LINEVAL+1)
// = 0 + (800*4 + 0) * 479
// =
VIDW00ADD1B0 = (((HOZVAL + 1)*4 + 0) * (LINEVAL + 1)) & (0xffffff);
//VIDW00ADD1B0 = FRAME_BUFFER + HOZVAL * LINEVAL * 4; // 新加的，是该这个吗?
SHADOWCON = 0x1; // 使能通道0
// LCD控制器开启
VIDCON0 |= 0x3; // 开启总控制器
WINCON0 |= 1; // 开启窗口0
}
void lcd_draw_pixel(int row, int col, int color)
{
int * pixel = (int *)FRAME_BUFFER;
*(pixel + row * (HOZVAL+1) + col) = color;
return;
}
void lcd_clear_screen(int color)
{
int i, j;
for (i = 0; i < (LINEVAL+1); i++)
for (j = 0; j < (HOZVAL+1); j++)
{
lcd_draw_pixel(i, j, color);
}
return;
}
void lcd_draw_bmp(int bmp_file_addr)
{
int i, j;
char * p = (char *)bmp_file_addr;
int blue, green, red;
int color;
// read bmp file
// bmp file header is 54 bytes
p += 54;
for (i = 0; i < 480; i++)
for (j = 0; j < 800; j++)
{
blue = *p++;
green = *p++;
red = *p++;
color = red << 16 | green << 8 | blue << 0;
lcd_draw_pixel(480-i, j, color);
}
return;
}
====================================================================
Makefile文件：
uart.bin:start.s main.c uart.c clock.c lib.c nand.c lcd.c mem_setup.S
arm-linux-gcc -nostdlib -c start.s -o start.o
arm-linux-gcc -nostdlib -c main.c -o main.o
arm-linux-gcc -nostdlib -c uart.c -o uart.o
arm-linux-gcc -nostdlib -c lib.c -o lib.o
arm-linux-gcc -nostdlib -c clock.c -o clock.o
arm-linux-gcc -nostdlib -c lcd.c -o lcd.o
arm-linux-gcc -nostdlib -c nand.c -o nand.o
arm-linux-gcc -nostdlib -c mem_setup.S -o mem_setup.o
arm-linux-ld -T bootloader.lds start.o main.o uart.o lib.o clock.o lcd.o nand.o mem_setup.o -o uart_elf
arm-linux-objcopy -O binary -S uart_elf uart.bin
clean:
rm -rf *.o *.bin uart_elf *.dis
===================================================================
bootloader.lds链接文件：
SECTIONS {
. = 0x36000010;
.text : {
* (.text)
}
. = ALIGN(4);
.rodata : {
* (.rodata)
}
. = ALIGN(4);
.data : {
* (.data)
}
. = ALIGN(4);
bss_start = .;
.bss : { *(.bss) *(COMMON) }
bss_end = .;
}
===================================================================
二，显示开机logo：
(1).如何制作LCD可以显示的数据：
我知道往往有很多人想在LCD上面显示图片的时候，第一想法就是想把一张图片转换成一个数组，然后编译进程序里面，再来显示，当然，这也是一种方法。
而我，会介绍另外一种方法，直接将bmp格式的图片下载进开发板，就能够显示：
先说怎么生成bmp图片吧：(方法万千，我只说我的方法)
1).从网上下载任意格式，任意内容的图片(大小小于等于你的LCD尺寸，当然可以自己修剪大小)；
2).用Img2Lcd工具(以贡献在该文件下了)打开图片，然后做以下设置：
输出数据类型：BMP格式(*.bmp) (我有试过用这个软件生成数组，但是显示的图片有问题)
扫描模式：水平扫描
输出灰度：24位真彩色(根据自己的LCD情况设置)
最大宽度和高度：800*480(根据自己的LCD大小设置)
注意：以上设置，全凭个人喜好...自己多试试，应该没有什么问题
3).保存
(2).说说BMP文件格式：
我只说一句，就是真正的颜色数据是从第55字节开始的，详细信号可以阅读文章：
http://www.blogjava.net/georgehill/articles/6549.html
或者自行google
(3).在显示图片的LCD程序中，相比较前面的LCD程序，在初始化函数中，我修改了一下时钟，使频率降低了一下，否则显示的图片有"亮斑"。
(4).LCD显示图片的功能我已经加入bootloader，请自己阅读代码。
注意：
测试"11_lcd"的程序时，图片需要单独烧写到nand的0xC00000处！！！
注意：
支持开机LCD显示logo(一张图片)的bootloader的代码放在了"Tiny210学习日记_代码"目录下了，名为"bootloader_lcd"。
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