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今天是：2024年10月12日（星期六）
2018年10月12日 | Tiny210裸机IIC之at24cxx操作
2018-10-12 来源：eefocus
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:
mrs r0, cpsr
bic r0,r0,#0x1f // 清M4~M0
orr r0,r0,#0x12
msr cpsr,r0 // 进入irq
ldr sp, =0x3e000000 // 初始化普通中断模式的栈，指向内存
bl irq_init
mrs r0, cpsr
bic r0,r0,#0x9f // 开总的中断开关,清M4~M0
orr r0,r0,#0x10
msr cpsr,r0 // 进入user mode
ldr sp, =0x3f000000 // 初始化用户模式的栈，指向内存
ldr pc, =main
halt:
b halt
.global key_IRQ
key_IRQ:
sub lr, lr, #4 // 1.计算返回地址
stmdb sp!, {r0-r12, lr} // 2.保护现场
// 3. 处理异常
bl do_irq
// 4. 恢复现场
ldmia sp!, {r0-r12, pc}^ // ^表示把spsr恢复到cpsr
=================================================================
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
// TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
#define DMC0_TIMINGA_REF 0x00000618
#define DMC0_TIMING_ROW 0x2B34438A // TimingRow for @200MHz
#define DMC0_TIMING_DATA 0x24240000 // TimingData CL=3
#define DMC0_TIMING_PWR 0x0BDC0343 // TimingPower
// MemControl BL=4, 2 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
#define DMC1_MEMCONTROL 0x00202400
// MemConfig0 512MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
#define DMC1_MEMCONFIG_0 0x40F00313
#define DMC1_MEMCONFIG_1 0x00F00313 // MemConfig1
// TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
#define DMC1_TIMINGA_REF 0x00000618
#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]
@MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
ldr r1, =DMC0_MEMCONTROL
str r1, [r0, #DMC_MEMCONTROL]
@MemConfig0 256MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
ldr r1, =DMC0_MEMCONFIG_0
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]
@TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
ldr r1, =DMC0_TIMINGA_REF
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]
@MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
ldr r1, =0x00202400
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)
{
}
=====================================================================
uart.c源码：
#define GPA0CON (*(volatile unsigned int *)0xE0200000)
#define ULCON0 (*(volatile unsigned int *)0xE2900000)
#define UCON0 (*(volatile unsigned int *)0xE2900004)
#define UTRSTAT0 (*(volatile unsigned int *)0xE2900010)
#define UTXH0 (*(volatile unsigned char *)0xE2900020)
#define URXH0 (*(volatile unsigned char *)0xE2900024)
#define UBRDIV0 (*(volatile unsigned int *)0xE2900028)
#define UDIVSLOT0 (*(volatile unsigned int *)0xE290002C)
void uart_init(void)
{
// 设置对应GPIO用于UART0
GPA0CON |= 0x22;
// 设置UART0寄存器
// bit[1:0]:0x3 = 8位数据位
// 其他位默认,即1位停止位，无校验，正常模式
ULCON0 |= (0x3<<0);
// Receive Mode [1:0]:1 = 接收采用查询或者中断模式
// Transmit Mode[3:2]:1 = 发送采用查询或者中断模式
// bit[6]:1 = 产生错误中断
// bit[10]:0 = 时钟源为PCLK
UCON0 = (1<<6)|(1<<2)|(1<<0);
// 设置波特率(详细信息请参考手册或者学习日记)
// DIV_VAL = UBRDIVn + (num of 1's in UDIVSLOTn)/16
// DIV_VAL = (PCLK / (bps x 16)) - 1
UBRDIV0 = 0x23;
UDIVSLOT0 = 0x808;
return;
}
char uart_getchar(void)
{
char c;
// 查询状态寄存器，直到有有效数据
while (!(UTRSTAT0 & (1<<0)));
c = URXH0; // 读取接收寄存器的值
return c;
}
void uart_putchar(char c)
{
// 查询状态寄存器，直到发送缓存为空
while (!(UTRSTAT0 & (1<<2)));
UTXH0 = c; // 写入发送寄存器
return;
}
=====================================================================
lib.c源码：
#include "uart.h"
#define UTRSTAT0 (*(volatile unsigned int *)0xE2900010)
#define UTXH0 (*(volatile unsigned char *)0xE2900020)
#define URXH0 (*(volatile unsigned char *)0xE2900024)
void delay(void)
{
volatile int i = 0x100000;
while (i--);
}
void putchar_hex(char c)
{
char * hex = "0123456789ABCDEF";
uart_putchar(hex[(c>>4) & 0x0F]);
uart_putchar(hex[(c>>0) & 0x0F]);
return;
}
int putchar(int c)
{
if(c == '\r')
{
while(!(UTRSTAT0&(1<<1)));
UTXH0 = '\n';
}
if(c == '\n')
{
while(!(UTRSTAT0&(1<<1)));
UTXH0 = '\r';
}
while(!(UTRSTAT0&(1<<1)));
UTXH0 = c;
}
int getchar(void)
{
int c;
c = (int)uart_getchar();
if (c == '\r')
return '\n';
return c;
}
int puts(const char * s)
{
while (*s)
putchar(*s++);
return 0;
}
char * gets(char * s)
{
char * p = s;
while ((*p = getchar()) != '\n')
{
if (*p != '\b')
{
putchar(*p++);
}
else
{
if (p > s)
{
puts ("\b \b");
p--;
}
}
}
*p = '\0';
putchar('\n');
return s;
}
void putint_hex(int a)
{
putchar_hex( (a>>24) & 0xFF );
putchar_hex( (a>>16) & 0xFF );
putchar_hex( (a>>8) & 0xFF );
putchar_hex( (a>>0) & 0xFF );
}
char * itoa(int a, char * buf)
{
int num = a;
int i = 0;
int len = 0;
do
{
buf[i++] = num % 10 + '0';
num /= 10;
} while (num);
buf[i] = '\0';
len = i;
for (i = 0; i < len/2; i++)
{
char tmp;
tmp = buf[i];
buf[i] = buf[len-i-1];
buf[len-i-1] = tmp;
}
return buf;
}
int strcmp(const char * s1, const char * s2)
{
while (*s1 == *s2)
{
if (*s1 == '\0')
return 0;
s1++;
s2++;
}
return *s1 - *s2;
}
int atoi(char * buf)
{
int value = 0;
int base = 10;
int i = 0;
if (buf[0] == '0' && buf[1] == 'x')
{
base = 16;
i = 2;
}
// 123 = (1 * 10 + 2) * 10 + 3
// 0x1F = 1 * 16 + F(15)
while (buf[i])
{
int tmp;
if (buf[i] <= '9' && buf[i] >= '0')
tmp = buf[i] - '0';
else
tmp = buf[i] - 'a' + 10;
value = value * base + tmp;
i++;
}
return value;
}
typedef int * va_list;
#define va_start(ap, A) (ap = (int *)&(A) + 1)
#define va_arg(ap, T) (*(T *)ap++)
#define va_end(ap) ((void)0)
int wy_printf(const char * format, ...)
{
char c;
va_list ap;
va_start(ap, format);
while ((c = *format++) != '\0')
{
switch (c)
{
case '%':
c = *format++;
switch (c)
{
char ch;
char * p;
int a;
char buf[100];
case 'c':
ch = va_arg(ap, int);
putchar(ch);
break;
case 's':
p = va_arg(ap, char *);
puts(p);
break;
case 'x':
a = va_arg(ap, int);
putint_hex(a);
break;
case 'd':
a = va_arg(ap, int);
itoa(a, buf);
puts(buf);
break;
default:
break;
}
break;
default:
putchar(c);
break;
}
}
return 0;
}
=====================================================================
irq.c源码：
#include "lib.h"
#define VIC0INTSELECT (*(volatile unsigned int *)0xF200000C)
#define VIC1INTSELECT (*(volatile unsigned int *)0xF210000C)
#define VIC2INTSELECT (*(volatile unsigned int *)0xF220000C)
#define VIC3INTSELECT (*(volatile unsigned int *)0xF230000C)
#define VIC0INTENABLE (*(volatile unsigned int *)0xF2000010)
#define VIC0INTENCLEAR (*(volatile unsigned int *)0xF2000014)
#define VIC1INTENCLEAR (*(volatile unsigned int *)0xF2100014)
#define VIC2INTENCLEAR (*(volatile unsigned int *)0xF2200014)
#define VIC3INTENCLEAR (*(volatile unsigned int *)0xF2300014)
#define VIC0ADDRESS (*(volatile unsigned int *)0xF2000F00)
#define VIC1ADDRESS (*(volatile unsigned int *)0xF2100F00)
#define VIC2ADDRESS (*(volatile unsigned int *)0xF2200F00)
#define VIC3ADDRESS (*(volatile unsigned int *)0xF2300F00)
#define VIC1VECTADDR14 (*(volatile unsigned int *)0xF2100138)
#define VIC1INTENABLE (*(volatile unsigned int *)0xF2100010)
extern void key_IRQ(void);
void irq_init(void)
{
// 设置为IRQ中断
VIC1INTSELECT &= ~(1<<14);
// 使能中断(中断控制器里面的)
VIC1INTENABLE |= 1<<14;
// 设置中断向量
VIC1VECTADDR14 = (int)key_IRQ;
}
=====================================================================
I2C.c源码：
#include "lib.h"
// GPIO
#define GPD1CON (*(volatile unsigned int *)0xE02000C0)
#define GPD1PUD (*(volatile unsigned int *)0xE02000C8)
// IIC
#define IICCON (*(volatile unsigned int *)0xE1800000)
#define IICSTAT (*(volatile unsigned int *)0xE1800004)
#define IICDS (*(volatile unsigned int *)0xE180000C)
#define VIC0ADDRESS (*(volatile unsigned int *)0xF2000F00)
#define VIC1ADDRESS (*(volatile unsigned int *)0xF2100F00)
#define VIC2ADDRESS (*(volatile unsigned int *)0xF2200F00)
#define VIC3ADDRESS (*(volatile unsigned int *)0xF2300F00)
void Delay(int time);
#define WRDATA (1)
#define RDDATA (2)
typedef struct tI2C {
unsigned char *pData; // 数据缓冲区
volatile int DataCount; // 等待传输的数据长度
volatile int Status; // 状态
volatile int Mode; // 模式：读/写
volatile int Pt; // pData中待传输数据的位置
}t210_I2C, *pt210_I2C;
static t210_I2C g_t210_I2C;
void i2c_init(void)
{
// 选择引脚功能：GPE15:IICSDA, GPE14:IICSCL
GPD1CON |= 0x22;
GPD1PUD |= 0x5;
// bit[7] = 1, 使能ACK
// bit[6] = 0, IICCLK = PCLK/16
// bit[5] = 1, 使能中断
// bit[3:0] = 0xf, Tx clock = IICCLK/16
// PCLK = 66.7MHz, IICCLK = 4.1MHz
IICCON = (1<<7) | (0<<6) | (1<<5) | (0xf); // 0xaf
IICSTAT = 0x10; // I2C串行输出使能(Rx/Tx)
}
// 主机发送
// slvAddr : 从机地址，buf : 数据存放的缓冲区，len : 数据长度
void i2c_write(unsigned int slvAddr, unsigned char *buf, int len)
{
g_t210_I2C.Mode = WRDATA; // 写操作
g_t210_I2C.Pt = 0; // 索引值初始为0
g_t210_I2C.pData = buf; // 保存缓冲区地址
g_t210_I2C.DataCount = len; // 传输长度
IICDS = slvAddr;
IICSTAT = 0xf0; // 主机发送，启动
// 等待直至数据传输完毕
while (g_t210_I2C.DataCount != -1);
}
// 主机接收
// slvAddr : 从机地址，buf : 数据存放的缓冲区，len : 数据长度
void i2c_read(unsigned int slvAddr, unsigned char *buf, int len)
{
g_t210_I2C.Mode = RDDATA; // 读操作
g_t210_I2C.Pt = -1; // 索引值初始化为-1，表示第1个中断时不接收数据(地址中断)
g_t210_I2C.pData = buf; // 保存缓冲区地址
g_t210_I2C.DataCount = len; // 传输长度
IICDS = slvAddr;
IICSTAT = 0xb0; // 主机接收，启动
// 等待直至数据传输完毕
while (g_t210_I2C.DataCount != 0);
}
//----------IIC中断服务函数----------
void do_irq(void)
{
unsigned int iicSt,i;
wy_printf("do_irq \n");
iicSt = IICSTAT;
if(iicSt & 0x8){ wy_printf("Bus arbitration failed\n"); }
switch (g_t210_I2C.Mode)
{
case WRDATA:
{
if((g_t210_I2C.DataCount--) == 0)
{
// 下面两行用来恢复I2C操作，发出P信号
IICSTAT = 0xd0;
IICCON = 0xaf;
Delay(10000); // 等待一段时间以便P信号已经发出
break;
}
IICDS = g_t210_I2C.pData[g_t210_I2C.Pt++];
// 将数据写入IICDS后，需要一段时间才能出现在SDA线上
for (i = 0; i < 10; i++);
IICCON = 0xaf; // 恢复I2C传输
break;
}
case RDDATA:
{
if (g_t210_I2C.Pt == -1)
{
// 这次中断是发送I2C设备地址后发生的，没有数据
// 只接收一个数据时，不要发出ACK信号
g_t210_I2C.Pt = 0;
if(g_t210_I2C.DataCount == 1)
IICCON = 0x2f; // 恢复I2C传输，开始接收数据，接收到数据时不发出ACK
else
IICCON = 0xaf; // 恢复I2C传输，开始接收数据
break;
}
g_t210_I2C.pData[g_t210_I2C.Pt++] = IICDS;
g_t210_I2C.DataCount--;
if (g_t210_I2C.DataCount == 0)
{
// 下面两行恢复I2C操作，发出P信号
IICSTAT = 0x90;
IICCON = 0xaf;
Delay(10000); // 等待一段时间以便P信号已经发出
break;
}
else
{
// 接收最后一个数据时，不要发出ACK信号
if(g_t210_I2C.DataCount == 1)
IICCON = 0x2f; // 恢复I2C传输，接收到下一数据时无ACK
else
IICCON = 0xaf; // 恢复I2C传输，接收到下一数据时发出ACK
}
break;
}
default:
break;
}
// 清中断向量
VIC0ADDRESS = 0x0;
VIC1ADDRESS = 0x0;
VIC2ADDRESS = 0x0;
VIC3ADDRESS = 0x0;
}
// 延时函数
void Delay(int time)
{
for (; time > 0; time--);
}
unsigned char at24cxx_read(unsigned char address)
{
unsigned char val;
wy_printf("at24cxx_read address = %d\r\n", address);
i2c_write(0xA0, &address, 1);
wy_printf("at24cxx_read send address ok\r\n");
i2c_read(0xA0, (unsigned char *)&val, 1);
wy_printf("at24cxx_read get data ok\r\n");
return val;
}
void at24cxx_write(unsigned char address, unsigned char data)
{
unsigned char val[2];
val[0] = address;
val[1] = data;
i2c_write(0xA0, val, 2);
}
===================================================================
comand.c源码：
#include "lib.h"
#include "nand.h"
#include "i2c.h"
int help(int argc, char * argv[])
{
wy_printf("do_command 《%s》 \n", argv[0]); //实际为“<”
wy_printf("help message: \n");
wy_printf("md - memory dispaly\n");
wy_printf("mw - memory write\n");
wy_printf("nand read - nand read sdram_addr nand_addr size\n");
wy_printf("nand write - nand write sdram_addr nand_addr size\n");
return 0;
}
int md(int argc, char * argv[])
{
unsigned long *p = (unsigned long *)0;
int i, j;
wy_printf("do_command 《%s》 \n", argv[0]); //实际为“<”
if (argc <= 1) {
wy_printf ("Usage:\n%s\n", "md address");
return 1;
}
if (argc >= 2)
p = (unsigned long *)atoi(argv[1]);
for (j = 0; j < 16; j++)
{
wy_printf("%x: ", p);
for (i = 0; i < 4; i++)
wy_printf("%x ", *p++);
wy_printf("\n");
}
return 0;
}
int mw(int argc, char * argv[])
{
unsigned long *p = (unsigned long *)0;
int v = 0;
wy_printf("do_command 《%s》 \n", argv[0]); //实际为“<”
if (argc <= 2) {
wy_printf ("Usage:\n%s\n", "md address data");
return 1;
}
if (argc >= 2)
p = (unsigned long *)atoi(argv[1]);
if (argc >= 3)
v = atoi(argv[2]);
*p = v;
return 0;
}
int nand(int argc, char *argv[])
{
int nand_addr, sdram_addr;
unsigned int size;
if (argc < 5)
{
wy_printf("nand read sdram_addr nand_addr size\n");
wy_printf("nand write sdram_addr nand_addr size\n");
return 0;
}
sdram_addr = atoi(argv[2]);
nand_addr = atoi(argv[3]);
size = atoi(argv[4]);
wy_printf("do_command 《%s》 \n", argv[0]);
wy_printf("sdram 0x%x, nand 0x%x, size 0x%x\n", sdram_addr, nand_addr, size);
if (strcmp(argv[1], "read") == 0)
nand_read((unsigned char *)sdram_addr, nand_addr, size);
if (strcmp(argv[1], "write") == 0)
nand_write(sdram_addr, nand_addr, size);
wy_printf("nand %s finished!\n", argv[1]);
return 0;
}
int i2c(int argc, char *argv[])
{
int addr, data;
int temp;
addr = atoi(argv[2]);
data = atoi(argv[3]);
wy_printf("do_command 《%s》 \n", argv[0]); //实际为“<”
wy_printf("addr 0x%x, data 0x%x\n", addr, data);
if (strcmp(argv[1], "read") == 0)
{
temp = at24cxx_read(addr);
wy_printf("addr 0x%x`s data 0x%x\n", addr, temp);
}
if (strcmp(argv[1], "write") == 0)
at24cxx_write(addr, data);
wy_printf("i2c %s finished!\n", argv[1]);
return 0;
}
void run_command(int argc, char * argv[])
{
if (strcmp(argv[0], "help") == 0)
{
help(argc, argv);
return;
}
if (strcmp(argv[0], "md") == 0)
{
md(argc, argv);
return;
}
if (strcmp(argv[0], "mw") == 0)
{
mw(argc, argv);
return;
}
if (strcmp(argv[0], "i2c") == 0)
{
i2c(argc, argv);
return;
}
if (strcmp(argv[0], "nand") == 0)
nand(argc, argv);
if(argc >= 1)
wy_printf("Unknown command '%s' - try 'help' \n",argv[0]);
return;
}
==================================================================
main.c源码：
#include "command.h"
#include "clock.h"
#include "led.h"
#include "uart.h"
#include "lib.h"
#include "nand.h"
#include "i2c.h"
#define CFG_PROMPT "WY_BOOT # " // Monitor Command Prompt
#define CFG_CBSIZE 256 // Console I/O Buffer Size
char *argv[10];
int readline (const char *const prompt)
{
char console_buffer[CFG_CBSIZE]; // console I/O buffer
char *buf = console_buffer;
int argc = 0;
int state = 0;
//puts(prompt);
wy_printf("%s",prompt);
gets(console_buffer);
while (*buf)
{
if (*buf != ' ' && state == 0)
{
argv[argc++] = buf;
state = 1;
}
if (*buf == ' ' && state == 1)
{
*buf = '\0';
state = 0;
}
buf++;
}
return argc;
}
void message(void)
{
wy_printf("\nThis bootloader support some command to test peripheral:\n");
wy_printf("Such as: LCD, IIS, BUZZER \n");
wy_printf("Try 'help' to learn them \n\n");
}
int main(void)
{
char buf[6];
int argc = 0;
int i = 0;
led_init(); // 设置对应管脚为输出
uart_init();// 初始化UART0
nand_read_id(buf);
i2c_init(); // 初始化IIC
wy_printf("\n**********************************************************\n");
wy_printf(" wy_bootloader\n");
wy_printf(" vars: %d \n",2012);
wy_printf(" nand id:");
putchar_hex(buf[0]);
putchar_hex(buf[1]);
putchar_hex(buf[2]);
putchar_hex(buf[3]);
putchar_hex(buf[4]);
wy_printf("\n**********************************************************\n");
while (1)
{
argc = readline (CFG_PROMPT);
if(argc == 0 && i ==0)
{
message();
i=1;
}
run_command(argc, argv);
}
return 0;
}
=================================================================
Makefile文件：
uart.bin:start.s main.c uart.c clock.c led.c lib.c command.c nand.c mem_setup.S irq.c i2c.c
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 led.c -o led.o
arm-linux-gcc -nostdlib -c command.c -o command.o
arm-linux-gcc -nostdlib -c nand.c -o nand.o
arm-linux-gcc -nostdlib -c irq.c -o irq.o
arm-linux-gcc -nostdlib -c i2c.c -o i2c.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 led.o command.o nand.o mem_setup.o irq.o i2c.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 = .;
}
===================================================================
因为后面的声卡程序，要用到IIC，这里就讲下IIC，用AT24LC04的EEPROM做为测试：
1.IIC总线接线图：
问：既然只有两根总线，但是上面挂接了很多的从设备，那么CPU怎么来区分它们呢？
答：通过IIC协议发出的信号，一定会先发出地址信号，从而达到区分从设备的目的。
传送出的数据的格式为：
-----------------------------------------------------------------------------------------------------------
开始信号 | 地址(7位) | 读/写控制信号 | 应答 | 数据(8位) | 应答 | 停止信号
-----------------------------------------------------------------------------------------------------------
2.IIC协议时序图:
开始信号:
SCL为高电平时，SDA产生一个下降沿信号；
结束信号:
SCL为高电平时，SDA产生一个上升沿信号，停止信号产生在数据发送结束时；
应答信号:
在数据传送的过程当中，谁来接收数据，就由谁来的发出应答信号，即将SDA信号线拉低，应答信号产生在第9个时钟；
数据传输:
在进行数据传送的时候，数据必须是在SCL为低电平的时候，才能够发生变化，在SCL高电平的时候，数据必须保持稳定；
3.读写过程分析：
写的过程:
开始的8个CLK中进行写的操作，SDA由主机驱动，第9个CLK，SDA由从机驱动，发出应答信号；
读的过程:
开始的8个CLK中进行读的操作，SDA由从机驱动，第9个CLK，SDA由主机驱动，发出应答信号；
4.对比S5PV210和S3C2440的IIC寄存器，发现S5PV210只是多了2个IIC总线，而且要用到的寄存器，几乎无差异，所以我就不再多少什么？请大家直接阅读我提供的代码和看老大AT24CXX的裸板程序的视频吧。
1.以下是初始化函数：
void i2c_init(void)
{
// 选择引脚功能：GPE15:IICSDA, GPE14:IICSCL
GPD1CON |= 0x22;
GPD1PUD |= 0x5;
// bit[7] = 1, 使能ACK
// bit[6] = 0, IICCLK = PCLK/16
// bit[5] = 1, 使能中断
// bit[3:0] = 0xf, Tx clock = IICCLK/16
// PCLK = 66.7MHz, IICCLK = 4.1MHz
IICCON = (1<<7) | (0<<6) | (1<<5) | (0xf); // 0xaf
IICSTAT = 0x10; // I2C串行输出使能(Rx/Tx)
}
2.在中断服务函数中，记得一定要清中断(即清中断向量地址)，否则会出现只能够进入一次中断服务函数的情况，清中断的过程如下：
// 清中断向量
VIC0ADDRESS = 0x0;
VIC1ADDRESS = 0x0;
VIC2ADDRESS = 0x0;
VIC3ADDRESS = 0x0;
3.每次读或写完一次，即每次进入中断的时候，记得复位IIC总线，即清IIC控制器中的中断标志，类容如下：
IICCON = 0x2f；或者IICCON = 0xaf；
注意：
1.参考代码放在了"Tiny210学习日记_代码"目录下了，名为"13_at24cxx"。
2.测试方法：(在终端输入)
i2c read 0x0 (实现读0x0地址的操作)
i2c write 0x0 0xff (实现往0x0地址写0xff的操作)
下一篇:Tiny210裸机之按键中断
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如果单纯为了帖子数量，我支持复制和重复。 但是一个服务器能不能承受这么多复制帖子真让我失望。 比如一个资料，老是发来发去，我觉得很没意思的。 代码也是很多复制，粘贴形式。 解决问题的人少了，都是一些瞎话。比如我帮你顶，我也在等，希 ...… 查看全部问答＞ |
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avr单片机用7.3728 MHz或11.0592 MHz如何产生5MS的定时时标？ avr单片机用7.3728 MHz或11.0592 MHz如何产生5MS的定时时标？ 我用AVR单片机，晶体是7.3728 MHz或11.0592 MHz，要如何设置定时器才能产生准确的5MS定时中断？… 查看全部问答＞ |
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在中断程序中没一个采样周期都会从外设采集到一个数据readbuf[0]，该数据中存在毛刺，毛刺可认为是连续两次采样结果之差的绝对值大于一个阈值N，N为宏定义的一个数。但如果连续M次都出现这样的大数则认为是有效数字，M也为宏定义。 由于单片机资源 ...… 查看全部问答＞ |
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WinCE 6.0 R2 Platform builder for VS2005的插件可以用于VS2008吗？ 现有WinCE 6.0 R2 Platform builder for VS2005的插件，但是我准备迁移到VS2008的平台下，关于VS2008的资料比较少，请问该插件可以用于VS2008吗？… 查看全部问答＞ |
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同样的电路HDMI一致性测试，我们北京office的同事和上海的同事测试的结果为什么有时候差距甚大呢？（测试仪器是完全相同的型号，相同的板子）谁有类似的遭遇分享一下？谢谢~~… 查看全部问答＞ |
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在电路研发过程中，电容是最常用的电子元器件之一，主要用于平滑、储存能量或者交流电压整流后的滤波，另外还用于非精密的时序延时等。在代表电源寿命的 MTBF预计时，模型分析结果表明电容是影响开关电源寿命的主要因素，因此了解影响电容寿命的因 ...… 查看全部问答＞ |
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AP5056 大电流充电管理代理 13927409969 李生 AP5056是一颗超好用的大电流充电管理IC,充电电流可达1A,SOP-8封装。价格低廉，品质稳定，被广泛用于移动电源，PSP等锂电供电产品中。本公司为一级代理商，长期稳定供货。原厂技术支持。需要联系。 … 查看全部问答＞ |