SPI DTSI
作者:互联网
https://blog.csdn.net/ibelieve1974/article/details/72235579
嵌入式中的BSP---BSP到底是什么?
https://blog.csdn.net/qq_38500662/article/details/80965774
BSP与HAL的关系
GPIO配置,电平的上拉,下拉。输入输出配置:
下面是某个平台上的gpio的配置:
*power management*/ int gf_power_on(struct gf_dev* gf_dev) { int rc = 0; if (gpio_is_valid(gf_dev->pwr_gpio)) { gpio_set_value(gf_dev->pwr_gpio, 1); } msleep(10); pr_info("---- power on ok ----\n"); return rc; } int gf_power_off(struct gf_dev* gf_dev) { int rc = 0; if (gpio_is_valid(gf_dev->pwr_gpio)) { gpio_set_value(gf_dev->pwr_gpio, 0); gpio_set_value(gf_dev->reset_gpio, 0); } pr_info("---- power off ----\n"); return rc; } /******************************************************************** *CPU output low level in RST pin to reset GF. This is the MUST action for GF. *Take care of this function. IO Pin driver strength / glitch and so on. ********************************************************************/ int gf_hw_reset(struct gf_dev *gf_dev, unsigned int delay_ms) { if(gf_dev == NULL) { pr_info("Input buff is NULL.\n"); return -1; } gpio_direction_output(gf_dev->reset_gpio, 0); //这里注意一下gpio的方向(输入或者输出)
gpio_set_value(gf_dev->reset_gpio, 0); mdelay(3); gpio_set_value(gf_dev->reset_gpio, 1);//是拉高为高电平(1),或者拉低为低电平(0) mdelay(delay_ms); return 0; } int gf_irq_num(struct gf_dev *gf_dev) { if(gf_dev == NULL) { pr_info("Input buff is NULL.\n"); return -1; } else { return gpio_to_irq(gf_dev->irq_gpio); } }
DTSI的配置
标签:reset,return,gf,int,dev,SPI,gpio,DTSI 来源: https://www.cnblogs.com/chsigu/p/10731097.html