spi....

strtoul 是一个在C语言标准库中定义的函数，用于将字符串转换为无符号长整数（unsigned long）。以下是关于 strtoul 函数的详细说明：

 

函数原型：

cunsigned long int strtoul(const char *str, char **endptr, int base);

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 /*初始化

spi_transferx t

t.tx_buf = ker_buf;

t.len= 2;

err = spi_sync_transfer(g_spi, &t, 1);

&ecspil (

pinctr1-names ="default";

pinctr1-0 = <&pinctrl_ecspi1>;

fs1,spi-num-chipselects =<2>;

cs-gpios = <&gpio4 26 GPIO_ACTIVE_LOW>,<&gpio4 24 GPIO_ACTIVE_LOW>;

status = "okay";

dac: dac {

compatible ="100ask,spidev";

reg = <0>;选片选引脚

spi-max-frequency = <1000000>;一般都是这

{}

probe的存值

1在i2c存client

2在spi存spi

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