* * $Log$ * *
Definition in file buttons.h.
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Go to the source code of this file.
Defines | |
| #define | KEYCODE_UP 'U' |
| Key code of the UP button. | |
| #define | KEYCODE_DOWN 'D' |
| Key code of the DOWN button. | |
| #define | KEYCODE_SELECT 'S' |
| Key code of the SELECT button. | |
Functions | |
| void | ButtonInit (void) |
| Initialize the button interface. | |
| char | ButtonRead (u_long tmo) |
| Wait until the user pressed a button. | |
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Key code of the UP button. This code is returned by ButtonRead(), if the user presses the right button on the Calypso Board. |
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Key code of the DOWN button. This code is returned by ButtonRead(), if the user presses the left button on the Calypso Board. |
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Key code of the SELECT button. This code is returned by ButtonRead(), if the user presses the middle button on the Calypso Board. |
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Initialize the button interface. Configures and starts a continously running timer interrupt, which scans three GPIO lines. A low level on any line indicates, that the related button has been pressed by the user. The application must call ButtonRead() to read the code of a pressed button. Definition at line 313 of file buttons.c. 00315 { 00316 int dummy; 00317 00318 /* Enable scan timer clock. */ 00319 outr(PMC_PCER, _BV(BTN_TC_ID) | _BV(BTN_PIO_ID)); 00320 /* Disable the Clock Counter */ 00321 outr(BTN_TC_CC_REG, TC_CLKDIS); 00322 /* Disable all interrupts */ 00323 outr(BTN_TC_ID_REG, 0xFFFFFFFF); 00324 /* Clear the status register. */ 00325 dummy = inr(BTN_TC_S_REG); 00326 /* Select divider and compare trigger */ 00327 outr(BTN_TC_CM_REG, TC_CLKS_MCK32 | TC_CPCTRG); 00328 /* Enable the Clock counter */ 00329 outr(BTN_TC_CC_REG, TC_CLKEN); 00330 /* Validate the RC compare interrupt */ 00331 outr(BTN_TC_IE_REG, TC_CPCS); 00332 00333 /* Register timer interrupt handler. */ 00334 NutRegisterIrqHandler(&sig_BTN_TC, ScanTimerInterrupt, 0); 00335 /* Set to lowest priority. */ 00336 NutIrqSetPriority(&sig_BTN_TC, 0); 00337 00338 /* Enable timer interrupts */ 00339 NutIrqEnable(&sig_BTN_TC); 00340 00341 /* Set compare value for specified scan frequency. */ 00342 #if defined(AT91_PLL_MAINCK) 00343 outr(BTN_TC_RC_REG, At91GetMasterClock() / (32 * BTN_SCAN_FREQ)); 00344 #else 00345 outr(BTN_TC_RC_REG, NutGetCpuClock() / (32 * BTN_SCAN_FREQ)); 00346 #endif 00347 00348 /* Initialize GPIO lines for buttons. */ 00349 outr(BTN_PIO_PE_REG, BTN_SELECT | BTN_UP | BTN_DOWN); 00350 outr(BTN_PIO_OD_REG, BTN_SELECT | BTN_UP | BTN_DOWN); 00351 outr(BTN_PIO_PUE_REG, BTN_SELECT | BTN_UP | BTN_DOWN); 00352 00353 /* Software trigger starts the scan timer. */ 00354 outr(BTN_TC_CC_REG, TC_SWTRG);
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Wait until the user pressed a button. This routine will not handle concurrently pressed buttons, but return the button with the highest priority. SELECT has the highest and UP has the lowest priority.
Definition at line 369 of file buttons.c. 00371 { 00372 /* Wait for a button event from the interrupt handler. */ 00373 if (NutEventWait(&btn_que, tmo) == 0) { 00374 /* Copy the volatile value to a local variable. */ 00375 u_int pressed = btn_pressed; 00376 00377 if (pressed & BTN_SELECT) { 00378 return KEYCODE_SELECT; 00379 } 00380 if (pressed & BTN_DOWN) { 00381 return KEYCODE_DOWN; 00382 } 00383 if (pressed & BTN_UP) { 00384 return KEYCODE_UP; 00385 } 00386 } 00387 return 0;
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1.4.4