set_property PACKAGE_PIN G14 [get_ports SPI0_MISO] set_property IOSTANDARD LVCMOS33 [get_ports SPI0_MISO] set_property PACKAGE_PIN J15 [get_ports SPI0_MOSI] set_property IOSTANDARD LVCMOS33 [get_ports SPI0_MOSI] set_property PACKAGE_PIN J18 [get_ports SPI0_SCLK] set_property IOSTANDARD LVCMOS33 [get_ports SPI0_SCLK] set_property PACKAGE_PIN L19 [get_ports SPI_CS_tri_o[0]] set_property PACKAGE_PIN M17 [get_ports SPI_CS_tri_o[1]] set_property PACKAGE_PIN G19 [get_ports SPI_CS_tri_o[2]] # set_property PACKAGE_PIN J20 [get_ports SPI_CS_tri_o[3]] # set_property PACKAGE_PIN J19 [get_ports SPI_CS_tri_o[4]] # set_property PACKAGE_PIN F16 [get_ports SPI_CS_tri_o[5]] # set_property PACKAGE_PIN F17 [get_ports SPI_CS_tri_o[6]] set_property IOSTANDARD LVCMOS33 [get_ports SPI_CS_tri_o[*]]

// 对于 system-top.dts，添加 对spi1节点的引用声明 aliases { ethernet0 = &gem0; serial0 = &uart1; serial1 = &uart0; spi0 = &qspi; spi1 = &spi0; }; // 对于 pcw.dtsi，添加对于 spi1 设备的描述 &spi0 { is-decoded-cs = <0>; num-cs = <3>; status = "okay"; }; // 上面pcw.dtsi添加并修改成 &spi0 { // 下面这三行不变 is-decoded-cs = <0>; num-cs = <3>; status = "okay"; device@0 { compatible = "spidev"; reg = <0>; spi-max-frequency = <5000000>; #address-cells = <1>; #size-cells = <1>; }; };

2.修改内核配置

make ARCH=arm CROSS_COMPILE=/usr/local/gcc-linaro-7.5.0-2019.12-x86_64_ arm-linux-gnueabihf/bin/arm-linux-gnueabihf- menuconfig #### 执行修改操作 make ARCH=arm CROSS_COMPILE=/usr/local/gcc-linaro-7.5.0-2019.12-x86_64 _arm-linux-gnueabihf/bin/arm-linux-gnueabihf- all ## 配置下面两个宏使之生效 CONFIG_SPI_CADENCE = y CONFIG_SPI_SPIDEV = y # 并打开以下宏 Device Drivers ---> [*] SPI support ---> <*> Cadence SPI controller <*> Xilinx SPI controllor common module <*> User mode SPI device driver support

4.测试

spi_mio.h #ifndef _SPI_MIO_H_ #define _SPI_MIO_H_ #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #include 

spi_mio.cpp #include "spi_mio.h" using namespace std; spi::spi(std::string device_, uint32_t mode_, uint8_t bits_, uint32_t speed_) { device = device_; mode = mode_; bits = bits_; speed = speed_; fd_spi = open(device_.c_str(), O_RDWR); if (fd_spi < 0) { std::cout << "can't open spi device" << std::endl; } init(); } spi::~spi() { if (fd_spi > 0) { close(fd_spi); } } int spi::init() { int ret = 0; if (fd_spi > 0) { if (ioctl(fd_spi, SPI_IOC_WR_MODE32, &mode) == -1 || ioctl(fd_spi, SPI_IOC_RD_MODE32, &mode) == -1 || ioctl(fd_spi, SPI_IOC_WR_BITS_PER_WORD, &bits) == -1 || ioctl(fd_spi, SPI_IOC_RD_BITS_PER_WORD, &bits) == -1 || ioctl(fd_spi, SPI_IOC_WR_MAX_SPEED_HZ, &speed) == -1 || ioctl(fd_spi, SPI_IOC_RD_MAX_SPEED_HZ, &speed) == -1) { std::cout << "spi device init failed" << std::endl; return -1; } } return ret; } int spi::transfer(int fd, uint8_t *tx, uint8_t *rx, uint32_t len) { int ret = 0; struct spi_ioc_transfer tr = { .tx_buf = (unsigned long)tx, .rx_buf = (unsigned long)rx, .len = len, // .speed_hz = speed, // .bits_per_word = bits, }; ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1){ std::cout << "can't send spi message" << std::endl; return -1; } return ret; } void spi::delay(uint32_t count) { uint32_t fool = 0; while (count--){ fool++; } } void my_dev::my_dev_init() { uint8_t recv[8]; write(fd_spi, my_dev_register_config, 3); // transfer(fd_spi, my_dev_register_config, recv, 3); // 用于双向传输 }

main.cpp #include "spi_mio.h" int main() { my_dev dev1; dev1.my_dev_init(); return 0; }

原文链接：https://blog.csdn.net/Vanau/article/details/122460021

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