1 /****************************************************************************** 2 * Copyright (c) 2022 Telink Semiconductor (Shanghai) Co., Ltd. ("TELINK") 3 * All rights reserved. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 *****************************************************************************/ 18 #include "ext_gpio.h" 19 20 21 /** 22 * @brief This function set a pin's pull-up/down resistor. 23 * @param[in] gpio - the pin needs to set its pull-up/down resistor 24 * @param[in] up_down - the type of the pull-up/down resistor 25 * @return none 26 */ gpio_setup_up_down_resistor(gpio_pin_e gpio,gpio_pull_type up_down)27void gpio_setup_up_down_resistor(gpio_pin_e gpio, gpio_pull_type up_down) 28 { 29 unsigned char r_val = up_down & 0x03; 30 31 unsigned char base_ana_reg = 0x0e + ((gpio >> 8) << 1) + ( (gpio & 0xf0) ? 1 : 0 ); //group = gpio>>8; 32 unsigned char shift_num, mask_not; 33 34 if(gpio & 0x11){ 35 shift_num = 0; 36 mask_not = 0xfc; 37 } 38 else if(gpio & 0x22){ 39 shift_num = 2; 40 mask_not = 0xf3; 41 } 42 else if(gpio & 0x44){ 43 shift_num = 4; 44 mask_not = 0xcf; 45 } 46 else if(gpio & 0x88){ 47 shift_num = 6; 48 mask_not = 0x3f; 49 } 50 else{ 51 return; 52 } 53 54 if(GPIO_DP == gpio){ 55 //usb_dp_pullup_en (0); 56 } 57 58 analog_write_reg8(base_ana_reg, (analog_read_reg8(base_ana_reg) & mask_not) | (r_val << shift_num)); 59 } 60 61
