1、修改驱动
对于 STM32 来说,使用了一个结构体将一个外设的所有寄存器都放在一起,在上一节的基础上进行修改;
1.1、添加清除 bss 段代码,
1.2、添加寄存器结构体
新建一个文件,命名imx6u.h,注意地址的连续性,不连续记得占位;
让定义的结构体和基地址联系起来
其他外设也一样,包含 CCM_Type、IOMUX_SW_MUX_Type、IOMUX_SW_PAD_Type、GPIO_Type;
imx6u.h
// 外设寄存器组的基地址
#define CCM_BASE (0X020C4000)
#define IOMUX_SW_MUX_BASE (0X020E0044)
#define IOMUX_SW_PAD_BASE (0X020E0204)
#define GPIO1_BASE (0X0209C000)
// CCM 外设
typedef struct
{
volatile unsigned int CCR;
volatile unsigned int CCDR;
volatile unsigned int CSR;
volatile unsigned int CCSR;
volatile unsigned int CACRR;
volatile unsigned int CBCDR;
volatile unsigned int CBCMR;
volatile unsigned int CSCMR1;
volatile unsigned int CSCMR2;
volatile unsigned int CSCDR1;
volatile unsigned int CS1CDR;
volatile unsigned int CS2CDR;
volatile unsigned int CDCDR;
volatile unsigned int CHSCCDR;
volatile unsigned int CSCDR2;
volatile unsigned int CSCDR3;
volatile unsigned int RESERVED_1[2];
volatile unsigned int CDHIPR;
volatile unsigned int RESERVED_2[2];
volatile unsigned int CLPCR;
volatile unsigned int CISR;
volatile unsigned int CIMR;
volatile unsigned int CCOSR;
volatile unsigned int CGPR;
volatile unsigned int CCGR0;
volatile unsigned int CCGR1;
volatile unsigned int CCGR2;
volatile unsigned int CCGR3;
volatile unsigned int CCGR4;
volatile unsigned int CCGR5;
volatile unsigned int CCGR6;
volatile unsigned int RESERVED_3[1];
volatile unsigned int CMEOR;
}CCM_Type;
// IOMUX 寄存器组
typedef struct
{
volatile unsigned int JTAG_MOD;
volatile unsigned int JTAG_TMS;
volatile unsigned int JTAG_TDO;
volatile unsigned int JTAG_TDI;
volatile unsigned int JTAG_TCK;
volatile unsigned int JTAG_TRST_B;
volatile unsigned int GPIO1_IO00;
volatile unsigned int GPIO1_IO01;
volatile unsigned int GPIO1_IO02;
volatile unsigned int GPIO1_IO03;
volatile unsigned int GPIO1_IO04;
volatile unsigned int GPIO1_IO05;
volatile unsigned int GPIO1_IO06;
volatile unsigned int GPIO1_IO07;
volatile unsigned int GPIO1_IO08;
volatile unsigned int GPIO1_IO09;
volatile unsigned int UART1_TX_DATA;
volatile unsigned int UART1_RX_DATA;
volatile unsigned int UART1_CTS_B;
volatile unsigned int UART1_RTS_B;
volatile unsigned int UART2_TX_DATA;
volatile unsigned int UART2_RX_DATA;
volatile unsigned int UART2_CTS_B;
volatile unsigned int UART2_RTS_B;
volatile unsigned int UART3_TX_DATA;
volatile unsigned int UART3_RX_DATA;
volatile unsigned int UART3_CTS_B;
volatile unsigned int UART3_RTS_B;
volatile unsigned int UART4_TX_DATA;
volatile unsigned int UART4_RX_DATA;
volatile unsigned int UART5_TX_DATA;
volatile unsigned int UART5_RX_DATA;
volatile unsigned int ENET1_RX_DATA0;
volatile unsigned int ENET1_RX_DATA1;
volatile unsigned int ENET1_RX_EN;
volatile unsigned int ENET1_TX_DATA0;
volatile unsigned int ENET1_TX_DATA1;
volatile unsigned int ENET1_TX_EN;
volatile unsigned int ENET1_TX_CLK;
volatile unsigned int ENET1_RX_ER;
volatile unsigned int ENET2_RX_DATA0;
volatile unsigned int ENET2_RX_DATA1;
volatile unsigned int ENET2_RX_EN;
volatile unsigned int ENET2_TX_DATA0;
volatile unsigned int ENET2_TX_DATA1;
volatile unsigned int ENET2_TX_EN;
volatile unsigned int ENET2_TX_CLK;
volatile unsigned int ENET2_RX_ER;
volatile unsigned int LCD_CLK;
volatile unsigned int LCD_ENABLE;
volatile unsigned int LCD_HSYNC;
volatile unsigned int LCD_VSYNC;
volatile unsigned int LCD_RESET;
volatile unsigned int LCD_DATA00;
volatile unsigned int LCD_DATA01;
volatile unsigned int LCD_DATA02;
volatile unsigned int LCD_DATA03;
volatile unsigned int LCD_DATA04;
volatile unsigned int LCD_DATA05;
volatile unsigned int LCD_DATA06;
volatile unsigned int LCD_DATA07;
volatile unsigned int LCD_DATA08;
volatile unsigned int LCD_DATA09;
volatile unsigned int LCD_DATA10;
volatile unsigned int LCD_DATA11;
volatile unsigned int LCD_DATA12;
volatile unsigned int LCD_DATA13;
volatile unsigned int LCD_DATA14;
volatile unsigned int LCD_DATA15;
volatile unsigned int LCD_DATA16;
volatile unsigned int LCD_DATA17;
volatile unsigned int LCD_DATA18;
volatile unsigned int LCD_DATA19;
volatile unsigned int LCD_DATA20;
volatile unsigned int LCD_DATA21;
volatile unsigned int LCD_DATA22;
volatile unsigned int LCD_DATA23;
volatile unsigned int NAND_RE_B;
volatile unsigned int NAND_WE_B;
volatile unsigned int NAND_DATA00;
volatile unsigned int NAND_DATA01;
volatile unsigned int NAND_DATA02;
volatile unsigned int NAND_DATA03;
volatile unsigned int NAND_DATA04;
volatile unsigned int NAND_DATA05;
volatile unsigned int NAND_DATA06;
volatile unsigned int NAND_DATA07;
volatile unsigned int NAND_ALE;
volatile unsigned int NAND_WP_B;
volatile unsigned int NAND_READY_B;
volatile unsigned int NAND_CE0_B;
volatile unsigned int NAND_CE1_B;
volatile unsigned int NAND_CLE;
volatile unsigned int NAND_DQS;
volatile unsigned int SD1_CMD;
volatile unsigned int SD1_CLK;
volatile unsigned int SD1_DATA0;
volatile unsigned int SD1_DATA1;
volatile unsigned int SD1_DATA2;
volatile unsigned int SD1_DATA3;
volatile unsigned int CSI_MCLK;
volatile unsigned int CSI_PIXCLK;
volatile unsigned int CSI_VSYNC;
volatile unsigned int CSI_HSYNC;
volatile unsigned int CSI_DATA00;
volatile unsigned int CSI_DATA01;
volatile unsigned int CSI_DATA02;
volatile unsigned int CSI_DATA03;
volatile unsigned int CSI_DATA04;
volatile unsigned int CSI_DATA05;
volatile unsigned int CSI_DATA06;
volatile unsigned int CSI_DATA07;
}IOMUX_SW_MUX_Type;
typedef struct
{
volatile unsigned int DRAM_ADDR00;
volatile unsigned int DRAM_ADDR01;
volatile unsigned int DRAM_ADDR02;
volatile unsigned int DRAM_ADDR03;
volatile unsigned int DRAM_ADDR04;
volatile unsigned int DRAM_ADDR05;
volatile unsigned int DRAM_ADDR06;
volatile unsigned int DRAM_ADDR07;
volatile unsigned int DRAM_ADDR08;
volatile unsigned int DRAM_ADDR09;
volatile unsigned int DRAM_ADDR10;
volatile unsigned int DRAM_ADDR11;
volatile unsigned int DRAM_ADDR12;
volatile unsigned int DRAM_ADDR13;
volatile unsigned int DRAM_ADDR14;
volatile unsigned int DRAM_ADDR15;
volatile unsigned int DRAM_DQM0;
volatile unsigned int DRAM_DQM1;
volatile unsigned int DRAM_RAS_B;
volatile unsigned int DRAM_CAS_B;
volatile unsigned int DRAM_CS0_B;
volatile unsigned int DRAM_CS1_B;
volatile unsigned int DRAM_SDWE_B;
volatile unsigned int DRAM_ODT0;
volatile unsigned int DRAM_ODT1;
volatile unsigned int DRAM_SDBA0;
volatile unsigned int DRAM_SDBA1;
volatile unsigned int DRAM_SDBA2;
volatile unsigned int DRAM_SDCKE0;
volatile unsigned int DRAM_SDCKE1;
volatile unsigned int DRAM_SDCLK0_P;
volatile unsigned int DRAM_SDQS0_P;
volatile unsigned int DRAM_SDQS1_P;
volatile unsigned int DRAM_RESET;
volatile unsigned int TEST_MODE;
volatile unsigned int POR_B;
volatile unsigned int ONOFF;
volatile unsigned int SNVS_PMIC_ON_REQ;
volatile unsigned int CCM_PMIC_STBY_REQ;
volatile unsigned int BOOT_MODE0;
volatile unsigned int BOOT_MODE1;
volatile unsigned int SNVS_TAMPER0;
volatile unsigned int SNVS_TAMPER1;
volatile unsigned int SNVS_TAMPER2;
volatile unsigned int SNVS_TAMPER3;
volatile unsigned int SNVS_TAMPER4;
volatile unsigned int SNVS_TAMPER5;
volatile unsigned int SNVS_TAMPER6;
volatile unsigned int SNVS_TAMPER7;
volatile unsigned int SNVS_TAMPER8;
volatile unsigned int SNVS_TAMPER9;
volatile unsigned int JTAG_MOD;
volatile unsigned int JTAG_TMS;
volatile unsigned int JTAG_TDO;
volatile unsigned int JTAG_TDI;
volatile unsigned int JTAG_TCK;
volatile unsigned int JTAG_TRST_B;
volatile unsigned int GPIO1_IO00;
volatile unsigned int GPIO1_IO01;
volatile unsigned int GPIO1_IO02;
volatile unsigned int GPIO1_IO03;
volatile unsigned int GPIO1_IO04;
volatile unsigned int GPIO1_IO05;
volatile unsigned int GPIO1_IO06;
volatile unsigned int GPIO1_IO07;
volatile unsigned int GPIO1_IO08;
volatile unsigned int GPIO1_IO09;
volatile unsigned int UART1_TX_DATA;
volatile unsigned int UART1_RX_DATA;
volatile unsigned int UART1_CTS_B;
volatile unsigned int UART1_RTS_B;
volatile unsigned int UART2_TX_DATA;
volatile unsigned int UART2_RX_DATA;
volatile unsigned int UART2_CTS_B;
volatile unsigned int UART2_RTS_B;
volatile unsigned int UART3_TX_DATA;
volatile unsigned int UART3_RX_DATA;
volatile unsigned int UART3_CTS_B;
volatile unsigned int UART3_RTS_B;
volatile unsigned int UART4_TX_DATA;
volatile unsigned int UART4_RX_DATA;
volatile unsigned int UART5_TX_DATA;
volatile unsigned int UART5_RX_DATA;
volatile unsigned int ENET1_RX_DATA0;
volatile unsigned int ENET1_RX_DATA1;
volatile unsigned int ENET1_RX_EN;
volatile unsigned int ENET1_TX_DATA0;
volatile unsigned int ENET1_TX_DATA1;
volatile unsigned int ENET1_TX_EN;
volatile unsigned int ENET1_TX_CLK;
volatile unsigned int ENET1_RX_ER;
volatile unsigned int ENET2_RX_DATA0;
volatile unsigned int ENET2_RX_DATA1;
volatile unsigned int ENET2_RX_EN;
volatile unsigned int ENET2_TX_DATA0;
volatile unsigned int ENET2_TX_DATA1;
volatile unsigned int ENET2_TX_EN;
volatile unsigned int ENET2_TX_CLK;
volatile unsigned int ENET2_RX_ER;
volatile unsigned int LCD_CLK;
volatile unsigned int LCD_ENABLE;
volatile unsigned int LCD_HSYNC;
volatile unsigned int LCD_VSYNC;
volatile unsigned int LCD_RESET;
volatile unsigned int LCD_DATA00;
volatile unsigned int LCD_DATA01;
volatile unsigned int LCD_DATA02;
volatile unsigned int LCD_DATA03;
volatile unsigned int LCD_DATA04;
volatile unsigned int LCD_DATA05;
volatile unsigned int LCD_DATA06;
volatile unsigned int LCD_DATA07;
volatile unsigned int LCD_DATA08;
volatile unsigned int LCD_DATA09;
volatile unsigned int LCD_DATA10;
volatile unsigned int LCD_DATA11;
volatile unsigned int LCD_DATA12;
volatile unsigned int LCD_DATA13;
volatile unsigned int LCD_DATA14;
volatile unsigned int LCD_DATA15;
volatile unsigned int LCD_DATA16;
volatile unsigned int LCD_DATA17;
volatile unsigned int LCD_DATA18;
volatile unsigned int LCD_DATA19;
volatile unsigned int LCD_DATA20;
volatile unsigned int LCD_DATA21;
volatile unsigned int LCD_DATA22;
volatile unsigned int LCD_DATA23;
volatile unsigned int NAND_RE_B;
volatile unsigned int NAND_WE_B;
volatile unsigned int NAND_DATA00;
volatile unsigned int NAND_DATA01;
volatile unsigned int NAND_DATA02;
volatile unsigned int NAND_DATA03;
volatile unsigned int NAND_DATA04;
volatile unsigned int NAND_DATA05;
volatile unsigned int NAND_DATA06;
volatile unsigned int NAND_DATA07;
volatile unsigned int NAND_ALE;
volatile unsigned int NAND_WP_B;
volatile unsigned int NAND_READY_B;
volatile unsigned int NAND_CE0_B;
volatile unsigned int NAND_CE1_B;
volatile unsigned int NAND_CLE;
volatile unsigned int NAND_DQS;
volatile unsigned int SD1_CMD;
volatile unsigned int SD1_CLK;
volatile unsigned int SD1_DATA0;
volatile unsigned int SD1_DATA1;
volatile unsigned int SD1_DATA2;
volatile unsigned int SD1_DATA3;
volatile unsigned int CSI_MCLK;
volatile unsigned int CSI_PIXCLK;
volatile unsigned int CSI_VSYNC;
volatile unsigned int CSI_HSYNC;
volatile unsigned int CSI_DATA00;
volatile unsigned int CSI_DATA01;
volatile unsigned int CSI_DATA02;
volatile unsigned int CSI_DATA03;
volatile unsigned int CSI_DATA04;
volatile unsigned int CSI_DATA05;
volatile unsigned int CSI_DATA06;
volatile unsigned int CSI_DATA07;
volatile unsigned int GRP_ADDDS;
volatile unsigned int GRP_DDRMODE_CTL;
volatile unsigned int GRP_B0DS;
volatile unsigned int GRP_DDRPK;
volatile unsigned int GRP_CTLDS;
volatile unsigned int GRP_B1DS;
volatile unsigned int GRP_DDRHYS;
volatile unsigned int GRP_DDRPKE;
volatile unsigned int GRP_DDRMODE;
volatile unsigned int GRP_DDR_TYPE;
}IOMUX_SW_PAD_Type;
// GPIO寄存器结构体
typedef struct
{
volatile unsigned int DR;
volatile unsigned int GDIR;
volatile unsigned int PSR;
volatile unsigned int ICR1;
volatile unsigned int ICR2;
volatile unsigned int IMR;
volatile unsigned int ISR;
volatile unsigned int EDGE_SEL;
}GPIO_Type;
// 外设指针
#define CCM ((CCM_Type *)CCM_BASE)
#define IOMUX_SW_MUX ((IOMUX_SW_MUX_Type *)IOMUX_SW_MUX_BASE)
#define IOMUX_SW_PAD ((IOMUX_SW_PAD_Type *)IOMUX_SW_PAD_BASE)
#define GPIO1 ((GPIO_Type *)GPIO1_BASE)
2、修改 main.c;
#include "imx6u.h"
// 使能外设时钟
void clk_enable(void)
{
CCM->CCGR0 = 0xffffffff;
CCM->CCGR1 = 0xffffffff;
CCM->CCGR2 = 0xffffffff;
CCM->CCGR3 = 0xffffffff;
CCM->CCGR4 = 0xffffffff;
CCM->CCGR5 = 0xffffffff;
CCM->CCGR6 = 0xffffffff;
}
// 初始化 led
void led_init(void)
{
IOMUX_SW_MUX->GPIO1_IO03 = 0x5; // 复用为 GPIO1_IO03
IOMUX_SW_PAD->GPIO1_IO03 =0x10b0; // 配置电气属性
// GPIO 初始化
GPIO1->GDIR = 0x8; // 设置为输出
GPIO1->DR = 0x0; // 打开 led
}
// 短延时
void delay_short(volatile unsigned int n)
{
while(n--){}
}
// 长延时,在 396MHz 下一次循环大概 1 ms
void delay_ms(volatile unsigned int n)
{
while(n--)
{
delay_short(0x7ff);
}
}
// 打开 led
void led_on(void)
{
GPIO1->DR &= ~(1<<3); // bit3 清零
}
// 关闭 led
void led_off(void)
{
GPIO1->DR |= (1<<3); // bit3 置1
}
int main(void)
{
clk_enable();
led_init();
// led 闪烁
while(1)
{
led_off();
delay_ms(100);
led_on();
delay_ms(100);
}
return 0;
}
3、修改 Makefile;
objs := start.o main.o
gcc := arm-linux-gnueabihf-gcc
ld := arm-linux-gnueabihf-ld
objcopy := arm-linux-gnueabihf-objcopy
objdump := arm-linux-gnueabihf-objdump
ledc.bin : $(objs)
$(ld) -Timx6u.lds -o ledc.elf $^
$(objcopy) -O binary -S ledc.elf $@
$(objdump) -D -m arm ledc.elf > ledc.dis
%.o : %.c
$(gcc) -Wall -nostdlib -c -O2 -o $@ $<
%.o : %.s
$(gcc) -Wall -nostdlib -c -O2 -o $@ $<
clean:
rm -rf *.o ledc.bin ledc.elf ledc.dis
给出连接脚本
SECTIONS{
. = 0X87800000;
.text :
{
start.o
*(.text)
}
.rodata ALIGN(4) : {*(.rodata*)}
.data ALIGN(4) : { *(.data) }
__bss_start = .;
.bss ALIGN(4) : { *(.bss) *(COMMON) }
__bss_end = .;
}
4、编译烧写验证;
I.MX6ULL_ledc_stm32