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标题: AIO3399J开发板上调试MCP2518FD，SPI时钟无输出 [打印本页]

作者: butterfly 时间: 2021-8-24 15:46
标题: AIO3399J开发板上调试MCP2518FD，SPI时钟无输出
各位同学，本人在AIO3399J开发板上调试MCP2518FD，DTS配制了SPI2，但SPI2时钟只输出一个高电平。

用SPI2_TEST测试程序，SPI2读写又是正常的。请问这个时钟要怎么设置？拜托各位大神了。

&spi2 {
status = "okay";
//max-frequency = <48000000>;

can0: can@0 {
compatible = "microchip,mcp2515";
      pinctrl-name = "default";
pinctrl-0 = <&can0_pins>;
reg = <0>;
clocks = <&clk16m>;
spi-max-frequency = <10000000>;
interrupt-parent = <&gpio4>;
interrupts = <28 IRQ_TYPE_EDGE_FALLING>;

      can0_pins: can0-pins {
         rockchip,pins = <4 28 RK_FUNC_GPIO &pcfg_pull_none>;
      };

      clk16m: clk16m {
         compatible = "fixed-clock";
      #clock-cells = <0>;
      clock-frequency = <16000000>;
      };
};
/*
* sp_test@00 {
*    compatible = "rockchip,spi_test_bus0_cs0";
*    id = <0>;
*    reg = <0>;
*    spi-max-frequency = <4000000>;
*    status = "okay";
* };
*
* sp_test@01 {
*    compatible = "rockchip,spi_test_bus0_cs1";
*    id = <1>;
*    reg = <1>;
*    spi-max-frequency = <4000000>;
* };
*/
};

作者: fengc234 时间: 2022-5-8 17:47
请教以下，你的问题后来是怎么解决的，我是用SPI2接MCP2515，但是设备一直没找到，报了以下三句，复位的时候用示波器抓不到波形
[ 1.703279] rockchip-spi ff1e0000.spi: Failed to request TX DMA channel
[ 1.703299] rockchip-spi ff1e0000.spi: Failed to request RX DMA channel
[ 1.703310] rockchip-spi ff1e0000.spi: no high_speed pinctrl state

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