我搜了下4.3.1的esp-idf，没有这个函数
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static const char *TAG = "I2S MASTER TX";
esp_err_t i2s_mclk_gpio_select(i2s_port_t i2s_num, gpio_num_t gpio_num)
{
if (i2s_num >= I2S_NUM_MAX) {
ESP_LOGE(TAG, "Does not support i2s number(%d)", i2s_num);
return ESP_ERR_INVALID_ARG;
}
if (gpio_num != GPIO_NUM_0 && gpio_num != GPIO_NUM_1 && gpio_num != GPIO_NUM_3) {
ESP_LOGE(TAG, "Only support GPIO0/GPIO1/GPIO3, gpio_num:%d", gpio_num);
return ESP_ERR_INVALID_ARG;
}
ESP_LOGI(TAG, "I2S%d, MCLK output by GPIO%d", i2s_num, gpio_num);
if (i2s_num == I2S_NUM_0) {
if (gpio_num == GPIO_NUM_0) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
WRITE_PERI_REG(PIN_CTRL, 0xFFF0);
} else if (gpio_num == GPIO_NUM_1) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD_CLK_OUT3);
WRITE_PERI_REG(PIN_CTRL, 0xF0F0);
} else {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD_CLK_OUT2);
WRITE_PERI_REG(PIN_CTRL, 0xFF00);
}
} else if (i2s_num == I2S_NUM_1) {
if (gpio_num == GPIO_NUM_0) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1);
WRITE_PERI_REG(PIN_CTRL, 0xFFFF);
} else if (gpio_num == GPIO_NUM_1) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD_CLK_OUT3);
WRITE_PERI_REG(PIN_CTRL, 0xF0FF);
} else {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD_CLK_OUT2);
WRITE_PERI_REG(PIN_CTRL, 0xFF0F);
}
}
return ESP_OK;
}