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i2c: Enable I2C Slave mode with input-only pin as SCL.

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Merges https://github.com/espressif/esp-idf/pull/8312

If we use I2C in slave mode, we can use input-only pin for SCL line (GPI 34-39).
But there is a problem in i2c_set_pin() which is called by i2c_param_config().
In case of using GPI as SCL the following statements are failed:
	1. gpio_set_level(scl_io_num, I2C_IO_INIT_LEVEL);
Function fails because it cannot set level for input pin. As a result a ESP_LOGE() is called.
	2. gpio_set_direction(scl_io_num, GPIO_MODE_INPUT_OUTPUT_OD);
Function fails because it accepts only GPIO pins. ESP_LOGE() is called, input mode is not enabled for the pin and as a result - no interrupts from the pin.
This commit is contained in:
John
2022-01-28 19:20:42 +03:00
committed by laokaiyao
parent f02169bc04
commit bcf7608cf8
1 changed files with 9 additions and 4 deletions
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13
components/driver/i2c.c
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@@ -871,10 +871,15 @@ esp_err_t i2c_set_pin(i2c_port_t i2c_num, int sda_io_num, int scl_io_num, bool s
esp_rom_gpio_connect_in_signal(sda_io_num, sda_in_sig, 0);
}
if (scl_io_num >= 0) {
gpio_set_level(scl_io_num, I2C_IO_INIT_LEVEL);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[scl_io_num], PIN_FUNC_GPIO);
gpio_set_direction(scl_io_num, GPIO_MODE_INPUT_OUTPUT_OD);
esp_rom_gpio_connect_out_signal(scl_io_num, scl_out_sig, 0, 0);
if (mode == I2C_MODE_MASTER) {
gpio_set_level(scl_io_num, I2C_IO_INIT_LEVEL);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[scl_io_num], PIN_FUNC_GPIO);
gpio_set_direction(scl_io_num, GPIO_MODE_INPUT_OUTPUT_OD);
esp_rom_gpio_connect_out_signal(scl_io_num, scl_out_sig, 0, 0);
} else {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[scl_io_num], PIN_FUNC_GPIO);
gpio_set_direction(scl_io_num, GPIO_MODE_INPUT);
}
esp_rom_gpio_connect_in_signal(scl_io_num, scl_in_sig, 0);
if (scl_pullup_en == GPIO_PULLUP_ENABLE) {
gpio_set_pull_mode(scl_io_num, GPIO_PULLUP_ONLY);