/*---------------------------------------------------------------------------------------------------------*/ int main(void) { volatile uint32_t u32InitCount; /* Unlock protected registers */ SYS_UnlockReg(); /* Init System, peripheral clock and multi-function I/O */ SYS_Init(); /* Lock protected registers */ SYS_LockReg(); /* Init UART0 for printf */ UART0_Init(); printf("\n\nCPU @ %d Hz\n", SystemCoreClock); printf("+-------------------------------------------------+\n"); printf("| Timer1 External Counter Input Sample Code |\n"); printf("+-------------------------------------------------+\n\n"); printf("# Timer Settings:\n"); printf(" Timer1: Clock source is HCLK(50 MHz); Continuous counting mode; Interrupt enable;\n"); printf(" External counter input enable; TCMP is 56789.\n"); printf("# Connect P2.0 to T1 pin and pull P2.0 High/Low as T1 counter input source.\n\n"); /* Configure P2.0 as GPIO output pin and pull pin status to Low first */ GPIO_SetMode(P2, 0, GPIO_PMD_OUTPUT); P20 = 0; /* Initial Timer1 default setting */ TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1); /* Configure Timer1 setting for external counter input function */ TIMER_SELECT_TOUT_PIN(TIMER1, TIMER_TOUT_PIN_FROM_TX_PIN); TIMER_SET_PRESCALE_VALUE(TIMER1, 0); TIMER_SET_CMP_VALUE(TIMER1, 56789); TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE); TIMER_EnableInt(TIMER1); /* Enable Timer1 NVIC */ NVIC_EnableIRQ(TMR1_IRQn); /* Clear Timer1 interrupt counts to 0 */ g_au32TMRINTCount[1] = 0; /* Start Timer1 counting */ TIMER_Start(TIMER1); /* To check if TDR of Timer1 must be 0 as default value */ if(TIMER_GetCounter(TIMER1) != 0) { printf("Default counter value is not 0. (%d)\n", TIMER_GetCounter(TIMER1)); /* Stop Timer1 counting */ TIMER_Close(TIMER1); while(1); } /* To generate one counter event to T1 pin */ GeneratePORT2Counter(0, 1); /* To check if TDR of Timer1 must be 1 */ while(TIMER_GetCounter(TIMER1) == 0); if(TIMER_GetCounter(TIMER1) != 1) { printf("Get unexpected counter value. (%d)\n", TIMER_GetCounter(TIMER1)); /* Stop Timer1 counting */ TIMER_Close(TIMER1); while(1); } /* To generate remains counts to T1 pin */ GeneratePORT2Counter(0, (56789 - 1)); while(1) { if((g_au32TMRINTCount[1] == 1) && (TIMER_GetCounter(TIMER1) == 56789)) { printf("Timer1 external counter input function ... PASS.\n"); break; } } /* Stop Timer1 counting */ TIMER_Close(TIMER1); while(1); }
/*---------------------------------------------------------------------------------------------------------*/ int main(void) { volatile uint32_t u32InitCount; uint32_t au32CAPValus[10]; /* Unlock protected registers */ SYS_UnlockReg(); /* Init System, peripheral clock and multi-function I/O */ SYS_Init(); /* Lock protected registers */ SYS_LockReg(); /* Init UART0 for printf */ UART0_Init(); printf("\n\nCPU @ %d Hz\n", SystemCoreClock); printf("+---------------------------------------------------+\n"); printf("| Timer External Capture Function Sample Code |\n"); printf("+---------------------------------------------------+\n\n"); printf("# Timer Settings:\n"); printf(" Timer0: Clock source is 12 MHz; Toggle-output mode and frequency is 500 Hz.\n"); printf(" Timer3: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n"); printf(" Timer2: Clock source is HCLK(72 MHz); Continuous counting mode; TCMP is 0xFFFFFF;\n"); printf(" Counter pin enable; Capture pin and capture interrupt enable;\n"); printf("# Generate 500 Hz frequency from TM0 and connect TM0 pin to Timer2 counter pin.\n"); printf("# Generate 1 Hz frequency from TM3 and connect TM3 pin to TM2_EXT capture pin.\n"); printf("# Get 500 event counts from Timer2 counter pin when each TM2_EXT pin interrupt occurred.\n\n"); /* Initial Timer0 and Timer3 default setting */ TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000); TIMER_Open(TIMER3, TIMER_TOGGLE_MODE, 2); /* Initial Timer2 default setting */ TIMER_Open(TIMER2, TIMER_CONTINUOUS_MODE, 1); /* Configure Timer2 setting for external counter input and capture function */ TIMER_SET_PRESCALE_VALUE(TIMER2, 0); TIMER_SET_CMP_VALUE(TIMER2, 0xFFFFFF); TIMER_EnableEventCounter(TIMER2, TIMER_COUNTER_FALLING_EDGE); TIMER_EnableCapture(TIMER2, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE); TIMER_EnableCaptureInt(TIMER2); /* Enable Timer2 NVIC */ NVIC_EnableIRQ(TMR2_IRQn); /* Clear Timer2 interrupt counts to 0 */ u32InitCount = g_au32TMRINTCount[2] = 0; /* Start Timer0, Timer2 and Timer3 counting */ TIMER_Start(TIMER0); TIMER_Start(TIMER2); TIMER_Start(TIMER3); /* Check TM2_EXT interrupt counts */ while(1) { if(g_au32TMRINTCount[2] != u32InitCount) { au32CAPValus[u32InitCount] = TIMER_GetCaptureData(TIMER2); printf("[%2d] - %4d\n", g_au32TMRINTCount[2], au32CAPValus[u32InitCount]); if(u32InitCount > 1) { if((au32CAPValus[u32InitCount] - au32CAPValus[u32InitCount - 1]) != 500) { printf("*** FAIL ***\n"); while(1); } } u32InitCount = g_au32TMRINTCount[2]; } if(u32InitCount == 10) break; } /* Stop Timer0, Timer2 and Timer3 counting */ TIMER_Close(TIMER0); TIMER_Close(TIMER2); TIMER_Close(TIMER3); printf("*** PASS ***\n"); while(1); }