[NOVATEK] NT96580行车记录仪功能学习笔记

一、u-Boot升级灯

运行u-Boot程序时LED灯闪烁，找到运行过程中一直在运行的函数在里面进行LED引脚电平的翻转

宏定义

Z:\SunFan\AHD580\pip\na51055_PIP\BSP\u-boot\include\configs\nvt-na51055-evb.h

Z:\SunFan\AHD580\pip\na51055_PIP\BSP\u-boot\drivers\mtd\nvt_flash_spi\nvt_flash_spi_cmd.c

自带led引脚电平设置函数

/*      LED function for FW update*/
static void led_set_gpio_high(int operation)
{
	u32 gpio_reg;
	int ofs = NVT_LED_RED_PIN/32;
	int shift = NVT_LED_RED_PIN & 0x1F;

	ofs = ofs*0x4;

	/*Set gpio as high*/
	gpio_reg = INW(IOADDR_GPIO_REG_BASE + 0x20 + ofs);

	#if 0
	if (gpio_reg & (1 << shift))
		RESTORE_GPIO_DIR = 1;
	else {
		gpio_reg |= (1 << shift);
		OUTW(IOADDR_GPIO_REG_BASE + 0x20 + ofs, gpio_reg);
	}
	#else
	gpio_reg |= (1 << shift);
	OUTW(IOADDR_GPIO_REG_BASE + 0x20 + ofs, gpio_reg);
	#endif

	OUTW(IOADDR_GPIO_REG_BASE + 0x40 + ofs, (1 << shift));

	//LED BLUE
	ofs = NVT_LED_BLUE_PIN/32;
	shift = NVT_LED_BLUE_PIN & 0x1F;
	ofs = ofs*0x4;
	gpio_reg = INW(IOADDR_GPIO_REG_BASE + 0x20 + ofs);
	gpio_reg |= (1 << shift);
	OUTW(IOADDR_GPIO_REG_BASE + 0x20 + ofs, gpio_reg);
	OUTW(IOADDR_GPIO_REG_BASE + 0x40 + ofs, (1 << shift));

	#if 0 // do not use delay!!! it will slow down flash erase/program!!!
	/*Config duration*/
	if (operation)
		mdelay(NVT_LED_PROGRAM_DURATION);
	else
		mdelay(NVT_LED_ERASE_DURATION);
	#endif
}

static void led_set_gpio_low(void)
{
	//u32 gpio_reg;
	int ofs = NVT_LED_RED_PIN/32;
	int shift = NVT_LED_RED_PIN & 0x1F;

	ofs = ofs*0x4;
	/*Set gpio as low*/
	OUTW(IOADDR_GPIO_REG_BASE + 0x60 + ofs, (1 << shift));

	//LED BLUE
	ofs = NVT_LED_BLUE_PIN/32;
	shift = NVT_LED_BLUE_PIN & 0x1F;

	ofs = ofs*0x4;
	OUTW(IOADDR_GPIO_REG_BASE + 0x60 + ofs, (1 << shift));

	#if 0
	/*Force gpio direction as original config*/
	if (!(RESTORE_GPIO_DIR)) {
		gpio_reg = INW(IOADDR_GPIO_REG_BASE + 0x20 + ofs);
		gpio_reg &= ~(1 << shift);
		OUTW(IOADDR_GPIO_REG_BASE + 0x20 + ofs, gpio_reg);
		RESTORE_GPIO_DIR = 0;
	}
	#endif
}

在spiNand_programPage和nand_cmd_erase_block里面进行计数电平翻转