[参考译文] TDA4VM：MAIN_CAN0 GPIO 示例

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1506762/tda4vm-main_can0-gpio-example

器件型号：TDA4VM

工具/软件：

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我正在为 BareMetal hello_world 计划而努力

-通过 CSS 在主 R5F 内核0 (MCU2_0)(j721e 评估板)上运行

-在 MAIN_CAN0上发送简单的 CAN 消息 -

作为参考、我使用了 mcan_evm_loopback_app_main_k3.c 文件。

1)我需要帮助、在哪里可以找到 Main_CAN0 (以及其他)的 STB、EN、TX、RX 可能的引脚

/* GPIO initialization */
    GPIO_init();
    /* Enable CAN transceivers by setting the STB pins */
    /* Enable the TCAN on GESI board.
     * Main Domain MCAN instances 4,5,6,7,9,11.
     */
    GPIO_write(0, GPIO_PIN_LOW);

    /* Set MCU_MCAN1_STB to LEVEL_LOW to exit CAN1 from Standby mode */
    GPIOSetDirMode_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN1_STB_PIN, GPIO_DIRECTION_OUTPUT);
    GPIOPinWrite_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN1_STB_PIN, GPIO_PIN_LOW);

#if defined (SOC_J721E) || defined (SOC_J7200) || defined (SOC_J721S2)
    /* Set MCU_MCAN0_EN Enable to LEVEL_HIGH to Enable MCU MCAN 0*/
    GPIOSetDirMode_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN0_ENABLE_PIN, GPIO_DIRECTION_OUTPUT);
    GPIOPinWrite_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN0_ENABLE_PIN, GPIO_PIN_HIGH);

    /* Set MCU_MCAN0_STBz pin to LEVEL_High to exit CAN0 from Standby mode */
    GPIOSetDirMode_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN0_STBZ_PIN, GPIO_DIRECTION_OUTPUT);
    GPIOPinWrite_v0(CSL_WKUP_GPIO0_BASE, MCU_MCAN0_STBZ_PIN, GPIO_PIN_HIGH);
#endif

在哪个文档中/可以找到从 STB 引脚到 CSL_WKUP_GPIOx_BASE 的映射？

2)如何在示例中完成 GPIO 映射?

第一部分通过 GPIO 接口完成、另一部分通过 I2C 完成。为什么？

#if defined (SOC_J721E)
    /*
     * Configuring TCA6424 IO Exp 2 with addr 0x22
     * This io expander is controlled by i2c0
     * For Main MCAN2 P13 and P14 should be set to 0, This should route the MCAN2 STB line to transciver.
     * For Main MCAN0 P06 and P07 should be set to 1.
     */
    /* I2C initialization */
    I2C_init();
    I2C_Params_init(&i2cParams);
    i2cParams.transferMode = I2C_MODE_BLOCKING;
    i2cParams.bitRate = I2C_400kHz;
    i2cParams.transferCallbackFxn = NULL;

    handle = I2C_open(0U, &i2cParams);

    dataToSlave[0] = TCA6424_REG_CONFIG0 | TCA6424_CMD_AUTO_INC;
    dataToSlave[1] = 0x0U;
    SetupI2CTransfer(handle, 0x22, &dataToSlave[0], 2, NULL, 0);

    dataToSlave[0] = TCA6424_REG_INPUT0 | TCA6424_CMD_AUTO_INC;
    dataToSlave[1] = 0x0U;
    dataToSlave[2] = 0x0U;
    dataToSlave[3] = 0x0U;
    SetupI2CTransfer(handle, 0x22, &dataToSlave[0], 1, &dataToSlave[1], 3);

    /* Set P06 and P07 to 1.
     * Set P13 and P14 to 0.
     */
    dataToSlave[0] = TCA6424_REG_OUTPUT0 | TCA6424_CMD_AUTO_INC;
    dataToSlave[1] |= 0xC0;
    dataToSlave[2] &= ~(0x18);
    SetupI2CTransfer(handle, 0x22, &dataToSlave[0], 1, &dataToSlave[1], 3);
#endif

注释与代码不匹配？ P06和 P07到底是如何激活的？

5 个月前