1 /******************************************************************************
2 *
3 * Copyright (C) 2022-2023 Maxim Integrated Products, Inc. (now owned by
4 * Analog Devices, Inc.),
5 * Copyright (C) 2023-2024 Analog Devices, Inc.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 ******************************************************************************/
20
21 #include <string.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include "max78000.h"
25 #include "gcr_regs.h"
26 #include "mxc_sys.h"
27
28 volatile uint32_t mailbox __attribute__((section(".mailbox")));
29 uint32_t SystemCoreClock __attribute__((section(".shared")));
30
31 /*
32 The libc implementation from GCC 11+ depends on _getpid and _kill in some places.
33 There is no concept of processes/PIDs in the baremetal PeriphDrivers, therefore
34 we implement stub functions that return an error code to resolve linker warnings.
35 */
_getpid(void)36 __weak int _getpid(void)
37 {
38 return E_NOT_SUPPORTED;
39 }
40
_kill(void)41 __weak int _kill(void)
42 {
43 return E_NOT_SUPPORTED;
44 }
45
__enable_irq(void)46 void __enable_irq(void)
47 {
48 // Set the MIE bit if we're outside the interrupt context
49 __asm volatile("csrw mstatus, 0x8");
50 }
51
SystemCoreClockUpdate(void)52 __weak void SystemCoreClockUpdate(void)
53 {
54 // uint32_t base_freq, div, clk_src;
55
56 // ARM core does this stuff for us
57 }
58
59 /* This function is called before C runtime initialization and can be
60 * implemented by the application for early initializations. If a value other
61 * than '0' is returned, the C runtime initialization will be skipped.
62 *
63 * You may over-ride this function in your program by defining a custom
64 * PreInit(), but care should be taken to reproduce the initilization steps
65 * or a non-functional system may result.
66 */
PreInit(void)67 __weak int PreInit(void)
68 {
69 /* Do nothing */
70 return 0;
71 }
72
73 /* This function can be implemented by the application to initialize the board */
Board_Init(void)74 __weak int Board_Init(void)
75 {
76 /* Do nothing */
77 return 0;
78 }
79
80 /* This function is called just before control is transferred to main().
81 *
82 * You may over-ride this function in your program by defining a custom
83 * SystemInit(), but care should be taken to reproduce the initialization
84 * steps or a non-functional system may result.
85 */
SystemInit(void)86 __weak void SystemInit(void)
87 {
88 // ARM core does this stuff for us
89 // but riscv needs variables initialized
90 SystemCoreClockUpdate();
91
92 Board_Init();
93 }
94
