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// #################################################################################################
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// #################################################################################################
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// # << NEORV32 - General Purpose Timer (GPTMR) Demo Program >> #
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// # << NEORV32 - General Purpose Timer (GPTMR) Demo Program >> #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # BSD 3-Clause License #
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// # #
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// # #
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// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #
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// # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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// # #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # permitted provided that the following conditions are met: #
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// # #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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/**********************************************************************//**
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/**********************************************************************//**
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* This program blinks an LED at GPIO.output(0) at 1Hz using the general purpose timer interrupt.
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* This program blinks an LED at GPIO.output(0) at 1Hz using the general purpose timer interrupt.
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*
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*
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* @note This program requires the GPTMR unit to be synthesized.
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* @note This program requires the GPTMR unit to be synthesized (and UART0 and GPIO).
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*
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*
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* @return Should not return;
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* @return Should not return;
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**************************************************************************/
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**************************************************************************/
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int main() {
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int main() {
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// capture all exceptions and give debug info via UART
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// capture all exceptions and give debug info via UART
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neorv32_rte_setup();
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neorv32_rte_setup();
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// init UART at default baud rate, no parity bits, ho hw flow control
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// init UART at default baud rate, no parity bits, no HW flow control
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neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
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neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
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// check if GPTMR unit is implemented at all
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// check if GPTMR unit is implemented at all
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if (neorv32_gptmr_available() == 0) {
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if (neorv32_gptmr_available() == 0) {
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neorv32_uart0_print("General purpose timer not implemented!\n");
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neorv32_uart0_print("ERROR! General purpose timer not implemented!\n");
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return 1;
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return 1;
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}
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}
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// Intro
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// Intro
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neorv32_uart0_print("General purpose timer (GPTMR) demo Program.\n"
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neorv32_uart0_print("General purpose timer (GPTMR) demo Program.\n"
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// install GPTMR interrupt handler
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// install GPTMR interrupt handler
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neorv32_rte_exception_install(GPTMR_RTE_ID, gptmr_firq_handler);
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neorv32_rte_exception_install(GPTMR_RTE_ID, gptmr_firq_handler);
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// configure timer for 1Hz in continuous mode
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// configure timer for 1Hz ticks in continuous mode (with clock divisor = 8)
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uint32_t soc_clock = NEORV32_SYSINFO.CLK;
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neorv32_gptmr_setup(CLK_PRSC_8, 1, NEORV32_SYSINFO.CLK / (8 * 2));
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soc_clock = soc_clock / 2; // divide by two as we are using the 1/2 clock prescaler
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neorv32_gptmr_setup(CLK_PRSC_2, 1, soc_clock);
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// enable interrupt
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// enable interrupt
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neorv32_cpu_irq_enable(GPTMR_FIRQ_ENABLE); // enable GPTRM FIRQ channel
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neorv32_cpu_irq_enable(GPTMR_FIRQ_ENABLE); // enable GPTMR FIRQ channel
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neorv32_cpu_eint(); // enable global interrupt flag
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neorv32_cpu_eint(); // enable global interrupt flag
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// do nothing, wait for interrupt
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// go to sleep mode and wait for interrupt
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while(1);
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while(1) {
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neorv32_cpu_sleep();
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}
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return 0;
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return 0;
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}
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}
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**************************************************************************/
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**************************************************************************/
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void gptmr_firq_handler(void) {
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void gptmr_firq_handler(void) {
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neorv32_cpu_csr_write(CSR_MIP, 1<<GPTMR_FIRQ_PENDING); // clear/ack pending FIRQ
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neorv32_cpu_csr_write(CSR_MIP, 1<<GPTMR_FIRQ_PENDING); // clear/ack pending FIRQ
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neorv32_uart0_putc('.'); // send tick symbol via UART
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neorv32_uart0_putc('.'); // send tick symbol via UART0
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neorv32_gpio_pin_toggle(0); // toggle output port bit 0
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neorv32_gpio_pin_toggle(0); // toggle output port bit 0
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}
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}
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