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We are integrating the TCAN4550 into our system.
Initialize the SPI directly after powered on, and then perform the read operation.
The SPI communications is working. But SDO can't receive any data like below chart:
DTS config:
&spi2 { status = "okay"; max-freq = <50000000>; cs-gpios = <&gpio2 RK_PB4 GPIO_ACTIVE_LOW>; tcan4x5x: tcan4x5x@0 { compatible = "ti,tcan4x5x"; reg = <0>; #address-cells = <1>; #size-cells = <1>; spi-max-frequency = <10000000>; clock-names = "cclk", "hclk"; clocks = <&tcan4x5x_cclk>, <&tcan4x5x_hclk>; bosch,mram-cfg = <0x0 2 1 4 5 0 3 10>; pinctrl-names = "default"; pinctrl-0 = <&pwr_en>, <&data_ready>; pwr_en-gpios = <&gpio2 RK_PA2 GPIO_ACTIVE_HIGH>; /* GPIO2_A2 */ data-ready-gpios = <&gpio2 RK_PB0 GPIO_ACTIVE_LOW>; /* GPIO2_B0 */ status = "okay"; };};
&pinctrl { tcan4x5x { pwr_en: pwr-en { rockchip,pins = <2 RK_PA2 RK_FUNC_GPIO &pcfg_pull_up>; }; data_ready: data-ready { rockchip,pins = <2 RK_PB0 RK_FUNC_GPIO &pcfg_pull_up>; }; };
};
您好，
请注意 TCAN4550在SCLK的上升沿采集SDI数据，在SCLK的下降沿输出数据至SDO管脚。因此建议您先检查下是否在SCLK的上升沿输入SDI 的数据已保持稳定，主控端应在SCLK的上升沿读取SDO输出数据。
看到您也在E2E英文论坛发帖咨询，建议您等待更了解这款芯片的英文论坛工程师为您解答：
https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1167590/tcan4550-tcan4550-can-t-receive-sdo-data-from-tcan4550?tisearch=e2e-sitesearch&keymatch=TCAN4550#
