single pin interface pin = 0..7 mode = INPUT, OUTPUT, INPUT_PULLUP (= same as INPUT)
| 78 | // pin = 0..7 |
| 79 | // mode = INPUT, OUTPUT, INPUT_PULLUP (= same as INPUT) |
| 80 | bool MCP23008::pinMode(uint8_t pin, uint8_t mode) |
| 81 | { |
| 82 | if (pin > 7) |
| 83 | { |
| 84 | _error = MCP23008_PIN_ERROR; |
| 85 | return false; |
| 86 | } |
| 87 | if ((mode != INPUT) && (mode != INPUT_PULLUP) && (mode != OUTPUT)) |
| 88 | { |
| 89 | _error = MCP23008_VALUE_ERROR; |
| 90 | return false; |
| 91 | } |
| 92 | |
| 93 | uint8_t dataDirectionRegister = MCP23008_DDR_A; |
| 94 | uint8_t val = readReg(dataDirectionRegister); |
| 95 | if (_error != MCP23008_OK) |
| 96 | { |
| 97 | return false; |
| 98 | } |
| 99 | uint8_t mask = 1 << pin; |
| 100 | // only work with valid |
| 101 | if ((mode == INPUT) || (mode == INPUT_PULLUP)) |
| 102 | { |
| 103 | val |= mask; |
| 104 | } |
| 105 | else if (mode == OUTPUT) |
| 106 | { |
| 107 | val &= ~mask; |
| 108 | } |
| 109 | // other values won't change val .... |
| 110 | writeReg(dataDirectionRegister, val); |
| 111 | if (_error != MCP23008_OK) |
| 112 | { |
| 113 | return false; |
| 114 | } |
| 115 | return true; |
| 116 | } |
| 117 | |
| 118 | |
| 119 | // pin = 0..7 |