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Diffstat (limited to 'examples/imx7_colibri_m4/driver_examples/gpt/main.c')
| -rw-r--r-- | examples/imx7_colibri_m4/driver_examples/gpt/main.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/examples/imx7_colibri_m4/driver_examples/gpt/main.c b/examples/imx7_colibri_m4/driver_examples/gpt/main.c new file mode 100644 index 0000000..8292b03 --- /dev/null +++ b/examples/imx7_colibri_m4/driver_examples/gpt/main.c @@ -0,0 +1,135 @@ +/* + * Copyright (c) 2015, Freescale Semiconductor, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * o Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * o Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * o Neither the name of Freescale Semiconductor, Inc. nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "gpt.h" +#include "board.h" +#include "clock_freq.h" +#include "debug_console_imx.h" + +/* This case will run for 5 seconds */ +static volatile uint32_t num = 10; +static uint32_t counterA, counterB; + +int main(void) +{ + uint32_t freqA, freqB; + gpt_mode_config_t config = { + .freeRun = false, + .waitEnable = true, + .stopEnable = true, + .dozeEnable = true, + .dbgEnable = false, + .enableMode = true + }; + + hardware_init(); + + /* Initialize GPT module */ + GPT_Init(BOARD_GPTA_BASEADDR, &config); + GPT_Init(BOARD_GPTB_BASEADDR, &config); + + /* Set GPT clock source, when use OSC as clock source, we need to make sure the OSC freq + * after divided by OscPrescaler should be less than half of the peripheral clock set by + * CCM */ + GPT_SetClockSource(BOARD_GPTA_BASEADDR, gptClockSourceOsc); + GPT_SetClockSource(BOARD_GPTB_BASEADDR, gptClockSourcePeriph); + + /* Divide GPTA osc clock source frequency by 2, and divide additional 2 inside GPT module */ + GPT_SetOscPrescaler(BOARD_GPTA_BASEADDR, 1); + GPT_SetPrescaler(BOARD_GPTA_BASEADDR, 1); + /* Divide GPTB clock source frequency by 2 inside GPT module */ + GPT_SetPrescaler(BOARD_GPTB_BASEADDR, 1); + + /* Get GPT clock frequency */ + freqA = 24000000 / 2; /* A is bound to OSC directly, with OSC divider 2 */ + freqB = get_gpt_clock_freq(BOARD_GPTB_BASEADDR); /* Get B peripheral clock freq */ + /* GPTA and GPTB frequency is divided by 2 inside module */ + freqA /= 2; + freqB /= 2; + + /* Set both GPT modules to 1 second duration */ + GPT_SetOutputCompareValue(BOARD_GPTA_BASEADDR, gptOutputCompareChannel1, freqA); + GPT_SetOutputCompareValue(BOARD_GPTB_BASEADDR, gptOutputCompareChannel1, freqB); + + /* Set GPT interrupt priority to same value to avoid handler preemption */ + NVIC_SetPriority(BOARD_GPTA_IRQ_NUM, 3); + NVIC_SetPriority(BOARD_GPTB_IRQ_NUM, 3); + /* Enable NVIC interrupt */ + NVIC_EnableIRQ(BOARD_GPTA_IRQ_NUM); + NVIC_EnableIRQ(BOARD_GPTB_IRQ_NUM); + + /* Enable GPT Output Compare1 interrupt */ + GPT_SetIntCmd(BOARD_GPTA_BASEADDR, gptStatusFlagOutputCompare1, true); + GPT_SetIntCmd(BOARD_GPTB_BASEADDR, gptStatusFlagOutputCompare1, true); + + PRINTF("GPT timer will now start\n\r"); + PRINTF("counter/freq ratio should be close to 0.0 or 1.0 ...\n\r"); + /* GPT start */ + GPT_Enable(BOARD_GPTA_BASEADDR); + GPT_Enable(BOARD_GPTB_BASEADDR); + + while (true) + { + __WFI(); + + while ((num & 1) != 0); /* wait both timer handled */ + + PRINTF("\tGPT A freq %u, counter %u.\n\r", freqA, counterA); + PRINTF("\tGPT B freq %u, counter %u.\n\r", freqB, counterB); + + if (num == 0) + { + /* Stop GPT */ + GPT_Disable(BOARD_GPTA_BASEADDR); + GPT_Disable(BOARD_GPTB_BASEADDR); + PRINTF("GPT example finished...\n\r"); + } + } +} + +void BOARD_GPTA_HANDLER() +{ + GPT_ClearStatusFlag(BOARD_GPTA_BASEADDR, gptStatusFlagOutputCompare1); + + if (num && --num) + counterB = GPT_ReadCounter(BOARD_GPTB_BASEADDR); +} + +void BOARD_GPTB_HANDLER() +{ + GPT_ClearStatusFlag(BOARD_GPTB_BASEADDR, gptStatusFlagOutputCompare1); + + if (num && --num) + counterA = GPT_ReadCounter(BOARD_GPTA_BASEADDR); +} + +/******************************************************************************* + * EOF + ******************************************************************************/ |