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[/] [neorv32/] [trunk/] [sw/] [example/] [blink_led/] [main.c] - Blame information for rev 68

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// #################################################################################################
// # << NEORV32 - Blinking LED Demo Program >>                                                     #
// # ********************************************************************************************* #
// # BSD 3-Clause License                                                                          #
// #                                                                                               #
// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
// #                                                                                               #
// # Redistribution and use in source and binary forms, with or without modification, are          #
// # permitted provided that the following conditions are met:                                     #
// #                                                                                               #
// # 1. Redistributions of source code must retain the above copyright notice, this list of        #
// #    conditions and the following disclaimer.                                                   #
// #                                                                                               #
// # 2. 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.                                                            #
// #                                                                                               #
// # 3. Neither the name of the copyright holder 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.                                                            #
// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************//**
 * @file blink_led/main.c
 * @author Stephan Nolting
 * @brief Simple blinking LED demo program using the lowest 8 bits of the GPIO.output port.
 **************************************************************************/
 
#include <neorv32.h>
 
 
/**********************************************************************//**
 * @name User configuration
 **************************************************************************/
/**@{*/
/** UART BAUD rate */
#define BAUD_RATE 19200
/** Use the custom ASM version for blinking the LEDs defined (= uncommented) */
//#define USE_ASM_VERSION
/**@}*/
 
 
/**********************************************************************//**
 * ASM function to blink LEDs
 **************************************************************************/
extern void blink_led_asm(uint32_t gpio_out_addr);
 
/**********************************************************************//**
 * C function to blink LEDs
 **************************************************************************/
void blink_led_c(void);
 
 
/**********************************************************************//**
 * Main function; shows an incrementing 8-bit counter on GPIO.output(7:0).
 *
 * @note This program requires the GPIO controller to be synthesized (the UART is optional).
 *
 * @return 0 if execution was successful
 **************************************************************************/
int main() {
 
  // init UART (primary UART = UART0; if no id number is specified the primary UART is used) at default baud rate, no parity bits, ho hw flow control
  neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
 
  // check if GPIO unit is implemented at all
  if (neorv32_gpio_available() == 0) {
    neorv32_uart0_print("Error! No GPIO unit synthesized!\n");
    return 1; // nope, no GPIO unit synthesized
  }
 
  // capture all exceptions and give debug info via UART
  // this is not required, but keeps us safe
  neorv32_rte_setup();
 
  // say hello
  neorv32_uart0_print("Blinking LED demo program\n");
 
 
// use ASM version of LED blinking (file: blink_led_in_asm.S)
#ifdef USE_ASM_VERSION
 
  blink_led_asm((uint32_t)(&NEORV32_GPIO.OUTPUT_LO));
 
// use C version of LED blinking
#else
 
  blink_led_c();
 
#endif
  return 0;
}
 
 
/**********************************************************************//**
 * C-version of blinky LED counter
 **************************************************************************/
void blink_led_c(void) {
 
  neorv32_gpio_port_set(0); // clear gpio output
 
  int cnt = 0;
 
  while (1) {
    neorv32_gpio_port_set(cnt++ & 0xFF); // increment counter and mask for lowest 8 bit
    neorv32_cpu_delay_ms(200); // wait 200ms using busy wait
  }
}

Line No.	Rev	Author	Line
1	2	zero_gravi	`// #################################################################################################`
2			`// # << NEORV32 - Blinking LED Demo Program >> #`
3			`// # ********************************************************************************************* #`
4			`// # BSD 3-Clause License #`
5			`// # #`
6	44	zero_gravi	`// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #`
7	2	zero_gravi	`// # #`
8			`// # Redistribution and use in source and binary forms, with or without modification, are #`
9			`// # permitted provided that the following conditions are met: #`
10			`// # #`
11			`// # 1. Redistributions of source code must retain the above copyright notice, this list of #`
12			`// # conditions and the following disclaimer. #`
13			`// # #`
14			`// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #`
15			`// # conditions and the following disclaimer in the documentation and/or other materials #`
16			`// # provided with the distribution. #`
17			`// # #`
18			`// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #`
19			`// # endorse or promote products derived from this software without specific prior written #`
20			`// # permission. #`
21			`// # #`
22			`// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #`
23			`// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #`
24			`// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #`
25			`// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #`
26			`// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #`
27			`// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #`
28			`// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #`
29			`// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #`
30			`// # OF THE POSSIBILITY OF SUCH DAMAGE. #`
31			`// # ********************************************************************************************* #`
32			`// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #`
33			`// #################################################################################################`
34
35
36			`/********************************************************************//`
37			`* @file blink_led/main.c`
38			`* @author Stephan Nolting`
39			`* @brief Simple blinking LED demo program using the lowest 8 bits of the GPIO.output port.`
40			`**************************************************************************/`
41
42			`#include <neorv32.h>`
43
44
45			`/********************************************************************//`
46			`* @name User configuration`
47			`**************************************************************************/`
48			`/*@{/`
49			`/** UART BAUD rate */`
50			`#define BAUD_RATE 19200`
51	37	zero_gravi	`/** Use the custom ASM version for blinking the LEDs defined (= uncommented) */`
52			`//#define USE_ASM_VERSION`
53	2	zero_gravi	`/*@}/`
54
55
56			`/********************************************************************//`
57	37	zero_gravi	`* ASM function to blink LEDs`
58	23	zero_gravi	`**************************************************************************/`
59			`extern void blink_led_asm(uint32_t gpio_out_addr);`
60
61	37	zero_gravi	`/********************************************************************//`
62			`* C function to blink LEDs`
63			`**************************************************************************/`
64			`void blink_led_c(void);`
65	23	zero_gravi
66	37	zero_gravi
67	23	zero_gravi	`/********************************************************************//`
68	22	zero_gravi	`* Main function; shows an incrementing 8-bit counter on GPIO.output(7:0).`
69	2	zero_gravi	`*`
70	22	zero_gravi	`* @note This program requires the GPIO controller to be synthesized (the UART is optional).`
71	2	zero_gravi	`*`
72	60	zero_gravi	`* @return 0 if execution was successful`
73	2	zero_gravi	`**************************************************************************/`
74			`int main() {`
75
76	51	zero_gravi	`// init UART (primary UART = UART0; if no id number is specified the primary UART is used) at default baud rate, no parity bits, ho hw flow control`
77	65	zero_gravi	`neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);`
78	22	zero_gravi
79	2	zero_gravi	`// check if GPIO unit is implemented at all`
80			`if (neorv32_gpio_available() == 0) {`
81	65	zero_gravi	`neorv32_uart0_print("Error! No GPIO unit synthesized!\n");`
82	61	zero_gravi	`return 1; // nope, no GPIO unit synthesized`
83	2	zero_gravi	`}`
84
85			`// capture all exceptions and give debug info via UART`
86			`// this is not required, but keeps us safe`
87	14	zero_gravi	`neorv32_rte_setup();`
88	2	zero_gravi
89			`// say hello`
90	65	zero_gravi	`neorv32_uart0_print("Blinking LED demo program\n");`
91	2	zero_gravi
92	23	zero_gravi
93	37	zero_gravi	`// use ASM version of LED blinking (file: blink_led_in_asm.S)`
94			`#ifdef USE_ASM_VERSION`
95
96	68	zero_gravi	`blink_led_asm((uint32_t)(&NEORV32_GPIO.OUTPUT_LO));`
97	37	zero_gravi
98	23	zero_gravi	`// use C version of LED blinking`
99	37	zero_gravi	`#else`
100	23	zero_gravi
101	37	zero_gravi	`blink_led_c();`
102
103			`#endif`
104			`return 0;`
105			`}`
106
107
108			`/********************************************************************//`
109			`* C-version of blinky LED counter`
110			`**************************************************************************/`
111			`void blink_led_c(void) {`
112
113	62	zero_gravi	`neorv32_gpio_port_set(0); // clear gpio output`
114	2	zero_gravi
115			`int cnt = 0;`
116
117			`while (1) {`
118	22	zero_gravi	`neorv32_gpio_port_set(cnt++ & 0xFF); // increment counter and mask for lowest 8 bit`
119			`neorv32_cpu_delay_ms(200); // wait 200ms using busy wait`
120	2	zero_gravi	`}`
121			`}`

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[/] [neorv32/] [trunk/] [sw/] [example/] [blink_led/] [main.c] - Blame information for rev 68