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zero_gravi |
// #################################################################################################
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// # < Frequency generator example program > #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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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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// # permitted provided that the following conditions are met: #
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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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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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// Libraries
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#include <stdint.h>
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#include <neo430.h>
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// Macros
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#define xstr(a) str(a)
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#define str(a) #a
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// Configuration
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#define BAUD_RATE 19200
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#define FREQ_GEN_CHANNEL 0
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/* ------------------------------------------------------------
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* INFO Main function
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* ------------------------------------------------------------ */
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int main(void) {
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// setup UART
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neo430_uart_setup(BAUD_RATE);
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// check if FREQ_GEN unit was synthesized, exit if not
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if (!(SYS_FEATURES & (1<<SYS_FREQ_GEN_EN))) {
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neo430_uart_br_print("Error! No frequency generator unit synthesized!");
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return 1;
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}
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// intro text
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neo430_uart_br_print("\nFrequency generator test program\n"
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"Using FREQ_GEN channel "xstr(FREQ_GEN_CHANNEL)"\n\n");
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neo430_freq_gen_reset(); // reset frequency generator
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neo430_freq_gen_enable_ch(FREQ_GEN_CHANNEL); // enable channel
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// just sweep through all possible frequency configurations
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uint32_t target_frequency = 0;
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for (target_frequency=0; target_frequency<0xffffffffL; target_frequency++) {
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neo430_uart_br_print("Target frequency: 0x");
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neo430_uart_print_hex_dword(target_frequency);
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neo430_uart_br_print(" Hz, real frequency: 0x");
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neo430_uart_print_hex_dword(neo430_freq_gen_set_freq(FREQ_GEN_CHANNEL, target_frequency)); // try to set target frequency, returns actual freq.
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neo430_uart_br_print(" Hz\n");
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neo430_cpu_delay_ms(500); // wait 0.5 seconds
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}
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return 0;
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}
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