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bugfix(uart): fix signal glitch on tx pin

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gpio_matrix_out function will set output enable for GPIO, seems in gpio_matrix_out there will be a short moment that the chip will output GPIO level.
So we can set GPIO as high before gpio_matrix_out function.
This commit is contained in:
Wangjialin 2017-07-20 14:34:11 +08:00
parent f6193a68a5
commit 9d466de235
1 changed files with 1 additions and 1 deletions
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2
components/driver/uart.c
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@ -394,7 +394,7 @@ esp_err_t uart_set_pin(uart_port_t uart_num, int tx_io_num, int rx_io_num, int r
}
if(tx_io_num >= 0) {
PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[tx_io_num], PIN_FUNC_GPIO);
gpio_set_direction(tx_io_num, GPIO_MODE_OUTPUT);
gpio_set_level(tx_io_num, 1);
gpio_matrix_out(tx_io_num, tx_sig, 0, 0);
}