Tests forked Keypad library.
Dependencies: FPointer keypad mbed
Schematic:
No extra hardware is needed besides the wires and switches. The columns are outputs configured with open drain. The rows are inputs configured with pull up resistors. A key press pulls down its row. With scanning the column is determined thereafter.
See keypad for the forked library used in this project.
main.cpp@3:fb173f712440, 2012-11-04 (annotated)
- Committer:
- gj_schoneveld
- Date:
- Sun Nov 04 09:50:00 2012 +0000
- Revision:
- 3:fb173f712440
- Parent:
- 2:eaa3d23e9b29
- Child:
- 4:16191e501b63
Multiple keys added
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
gj_schoneveld | 1:8bbe2b267de6 | 1 | #include "mbed.h" |
gj_schoneveld | 1:8bbe2b267de6 | 2 | #include "keypad.h" |
gj_schoneveld | 1:8bbe2b267de6 | 3 | |
gj_schoneveld | 1:8bbe2b267de6 | 4 | // Define your own keypad values |
gj_schoneveld | 1:8bbe2b267de6 | 5 | char Keytable[] = { '1', '2', '3', 'A', |
gj_schoneveld | 1:8bbe2b267de6 | 6 | '4', '5', '6', 'B', |
gj_schoneveld | 1:8bbe2b267de6 | 7 | '7', '8', '9', 'C', |
gj_schoneveld | 1:8bbe2b267de6 | 8 | '*', '0', '#', 'D' |
gj_schoneveld | 1:8bbe2b267de6 | 9 | }; |
gj_schoneveld | 1:8bbe2b267de6 | 10 | |
gj_schoneveld | 1:8bbe2b267de6 | 11 | BusOut code(LED4, LED3, LED2, LED1); //show binary code of key |
gj_schoneveld | 1:8bbe2b267de6 | 12 | |
gj_schoneveld | 1:8bbe2b267de6 | 13 | uint32_t cbAfterInput(uint32_t key) |
gj_schoneveld | 1:8bbe2b267de6 | 14 | { |
gj_schoneveld | 1:8bbe2b267de6 | 15 | printf("Key: %d => \'%c\'\n", key, Keytable[key]); |
gj_schoneveld | 1:8bbe2b267de6 | 16 | code = key; |
gj_schoneveld | 1:8bbe2b267de6 | 17 | |
gj_schoneveld | 1:8bbe2b267de6 | 18 | return 0; |
gj_schoneveld | 1:8bbe2b267de6 | 19 | } |
gj_schoneveld | 1:8bbe2b267de6 | 20 | |
gj_schoneveld | 3:fb173f712440 | 21 | uint32_t cbAfterMultipleInput(uint32_t key) |
gj_schoneveld | 3:fb173f712440 | 22 | { |
gj_schoneveld | 3:fb173f712440 | 23 | for (int i = 0; i < 16; i++) { |
gj_schoneveld | 3:fb173f712440 | 24 | if (key & (1 << i)) { |
gj_schoneveld | 3:fb173f712440 | 25 | printf("Key: %d => \'%c\'\t", i, Keytable[i]); |
gj_schoneveld | 3:fb173f712440 | 26 | } |
gj_schoneveld | 3:fb173f712440 | 27 | } |
gj_schoneveld | 3:fb173f712440 | 28 | printf("\n"); |
gj_schoneveld | 3:fb173f712440 | 29 | code = key; |
gj_schoneveld | 3:fb173f712440 | 30 | |
gj_schoneveld | 3:fb173f712440 | 31 | return 0; |
gj_schoneveld | 3:fb173f712440 | 32 | } |
gj_schoneveld | 3:fb173f712440 | 33 | |
gj_schoneveld | 1:8bbe2b267de6 | 34 | void Sleep(void) |
gj_schoneveld | 1:8bbe2b267de6 | 35 | { |
gj_schoneveld | 1:8bbe2b267de6 | 36 | __WFI(); |
gj_schoneveld | 1:8bbe2b267de6 | 37 | } |
gj_schoneveld | 1:8bbe2b267de6 | 38 | |
gj_schoneveld | 1:8bbe2b267de6 | 39 | int main() |
gj_schoneveld | 1:8bbe2b267de6 | 40 | { |
gj_schoneveld | 1:8bbe2b267de6 | 41 | printf("*** Keypad Demo ***\n"); |
gj_schoneveld | 1:8bbe2b267de6 | 42 | |
gj_schoneveld | 1:8bbe2b267de6 | 43 | Keypad keypad(p25, p26, p27, p28, p21, p22, p23, p24); |
gj_schoneveld | 2:eaa3d23e9b29 | 44 | |
gj_schoneveld | 2:eaa3d23e9b29 | 45 | // interrupt mode |
gj_schoneveld | 3:fb173f712440 | 46 | /* |
gj_schoneveld | 1:8bbe2b267de6 | 47 | keypad.CallAfterInput(&cbAfterInput); |
gj_schoneveld | 1:8bbe2b267de6 | 48 | keypad.Start(); |
gj_schoneveld | 1:8bbe2b267de6 | 49 | while (1) { |
gj_schoneveld | 1:8bbe2b267de6 | 50 | Sleep(); |
gj_schoneveld | 1:8bbe2b267de6 | 51 | } |
gj_schoneveld | 3:fb173f712440 | 52 | */ |
gj_schoneveld | 2:eaa3d23e9b29 | 53 | |
gj_schoneveld | 2:eaa3d23e9b29 | 54 | // polling mode |
gj_schoneveld | 2:eaa3d23e9b29 | 55 | /* |
gj_schoneveld | 2:eaa3d23e9b29 | 56 | keypad.Start(); |
gj_schoneveld | 2:eaa3d23e9b29 | 57 | while (1) { |
gj_schoneveld | 3:fb173f712440 | 58 | int key = keypad.DebouncedScan(); |
gj_schoneveld | 2:eaa3d23e9b29 | 59 | if (key >= 0) |
gj_schoneveld | 2:eaa3d23e9b29 | 60 | cbAfterInput(key); |
gj_schoneveld | 2:eaa3d23e9b29 | 61 | wait(0.1); |
gj_schoneveld | 2:eaa3d23e9b29 | 62 | } |
gj_schoneveld | 2:eaa3d23e9b29 | 63 | */ |
gj_schoneveld | 3:fb173f712440 | 64 | |
gj_schoneveld | 3:fb173f712440 | 65 | // poll multiple mode |
gj_schoneveld | 3:fb173f712440 | 66 | keypad.Start(); |
gj_schoneveld | 3:fb173f712440 | 67 | while (1) { |
gj_schoneveld | 3:fb173f712440 | 68 | key = keypad.DebouncedScanMultiple(); |
gj_schoneveld | 3:fb173f712440 | 69 | if (key > 0) |
gj_schoneveld | 3:fb173f712440 | 70 | cbAfterMultipleInput(key); |
gj_schoneveld | 3:fb173f712440 | 71 | wait(0.1); |
gj_schoneveld | 3:fb173f712440 | 72 | } |
gj_schoneveld | 0:5410e5950602 | 73 | } |