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firmware/ice40-riscv: Import common parts to all iCE40/RISC-V firmwares

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Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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Sylvain Munaut 2 years ago
parent 546493e606
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  3. 15
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  4. 22
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  5. 76
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  7. 69
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  17. 31
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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firmware/ice40-riscv/LICENSE.lgpl3
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
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a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
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whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
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a) Give prominent notice with each copy of the object code that the
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document.
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c) For a Combined Work that displays copyright notices during
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d) Do one of the following:
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Corresponding Source.
1) Use a suitable shared library mechanism for linking with the
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Library side by side in a single library together with other library
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choice, if you do both of the following:
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on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library as you
received it does not specify a version number of the GNU Lesser
General Public License, you may choose any version of the GNU Lesser
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If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
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Library.

15
firmware/ice40-riscv/README
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Firmware for iCE40 based board
==============================
The icE1usb, icE1usb-proto and e1-tracer boards are running very similar
gateware, all based around a PicoRV32 RISC-V softcore supported by custom
hardware cores to deal with USB and E1.
License
-------
Files in here are licended either under GPLv3 or LGPLv3 depending on the
specific file. Refer to the notice at the top of each file.
Full text for both licenses is included next to this README.

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firmware/ice40-riscv/common/bin2hex.py
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#!/usr/bin/env python3
#
# Converts binary into something that can be used by `readmemh`
#
# Copyright (C) 2020 Sylvain Munaut <tnt@246tNt.com>
# SPDX-License-Identifier: MIT
#
import struct
import sys
def main(argv0, in_name, out_name):
with open(in_name, 'rb') as in_fh, open(out_name, 'w') as out_fh:
while True:
b = in_fh.read(4)
if len(b) < 4:
break
out_fh.write('%08x\n' % struct.unpack('<I', b))
if __name__ == '__main__':
main(*sys.argv)

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firmware/ice40-riscv/common/console.c
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/*
* console.c
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#include <stdint.h>
#include "config.h"
#include "mini-printf.h"
struct wb_uart {
uint32_t data;
uint32_t clkdiv;
} __attribute__((packed,aligned(4)));
static volatile struct wb_uart * const uart_regs = (void*)(UART_BASE);
static char _printf_buf[128];
void console_init(void)
{
#ifdef BOARD_E1_TRACER
uart_regs->clkdiv = 22; /* ~1 Mbaud with clk=24MHz */
#else
uart_regs->clkdiv = 29; /* ~1 Mbaud with clk=30.72MHz */
#endif
}
char getchar(void)
{
int32_t c;
do {
c = uart_regs->data;
} while (c & 0x80000000);
return c;
}
int getchar_nowait(void)
{
int32_t c;
c = uart_regs->data;
return c & 0x80000000 ? -1 : (c & 0xff);
}
void putchar(char c)
{
uart_regs->data = c;
}
void puts(const char *p)
{
char c;
while ((c = *(p++)) != 0x00) {
if (c == '\n')
uart_regs->data = '\r';
uart_regs->data = c;
}
}
int printf(const char *fmt, ...)
{
va_list va;
int l;
va_start(va, fmt);
l = mini_vsnprintf(_printf_buf, 128, fmt, va);
va_end(va);
puts(_printf_buf);
return l;
}

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firmware/ice40-riscv/common/console.h
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/*
* console.h
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#pragma once
void console_init(void);
char getchar(void);
int getchar_nowait(void);
void putchar(char c);
void puts(const char *p);
int printf(const char *fmt, ...);

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firmware/ice40-riscv/common/dma.c
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/*
* dma.c
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdbool.h>
#include <stdint.h>
#include "config.h"
#include "dma.h"
struct dma {
uint32_t csr;
uint32_t _rsvd;
uint32_t addr_e1;
uint32_t addr_usb;
} __attribute__((packed,aligned(4)));
#define DMA_CSR_GO (1 << 15)
#define DMA_CSR_BUSY (1 << 15)
#define DMA_DIR_E1_TO_USB (0 << 14)
#define DMA_DIR_USB_TO_E1 (1 << 14)
#define DMA_CSR_LEN(x) (((x)-2) & 0x1fff)
static volatile struct dma * const dma_regs = (void*)(DMA_BASE);
static struct {
bool pending;
dma_cb cb_fn;
void *cb_data;
} g_dma;
bool
dma_ready(void)
{
return !(dma_regs->csr & DMA_CSR_BUSY);
}
void
dma_exec(unsigned addr_e1, unsigned addr_usb, unsigned len, bool dir,
dma_cb cb_fn, void *cb_data)
{
dma_regs->addr_e1 = addr_e1;
dma_regs->addr_usb = addr_usb;
dma_regs->csr =
DMA_CSR_GO |
(dir ? DMA_DIR_USB_TO_E1 : DMA_DIR_E1_TO_USB) |
DMA_CSR_LEN(len);
g_dma.pending = true;
g_dma.cb_fn = cb_fn;
g_dma.cb_data = cb_data;
}
bool
dma_poll(void)
{
if (g_dma.pending && dma_ready()) {
g_dma.pending = false;
if (g_dma.cb_fn)
g_dma.cb_fn(g_dma.cb_data);
}
return g_dma.pending;
}

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firmware/ice40-riscv/common/dma.h
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/*
* dma.h
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#pragma once
#include <stdbool.h>
typedef void (*dma_cb)(void *);
/* Direction
* 0 is E1 to USB
* 1 is USB to E1
*/
bool dma_ready(void);
void dma_exec(unsigned addr_e1, unsigned addr_usb, unsigned len, bool dir,
dma_cb cb_fn, void *cb_data);
bool dma_poll(void);

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firmware/ice40-riscv/common/led.c
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/*
* led.c
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#include <stdbool.h>
#include <stdint.h>
#include "config.h"
#include "led.h"
struct ledda_ip {
uint32_t _rsvd0;
uint32_t pwrr; /* 0001 LEDDPWRR - Pulse Width Register Red */
uint32_t pwrg; /* 0010 LEDDPWRG - Pulse Width Register Green */
uint32_t pwrb; /* 0011 LEDDPWRB - Pulse Width Register Blue */
uint32_t _rsvd1;
uint32_t bcrr; /* 0101 LEDDBCRR - Breathe Control Rise Register */
uint32_t bcfr; /* 0101 LEDDBCFR - Breathe Control Fall Register */
uint32_t _rsvd2;
uint32_t cr0; /* 1000 LEDDCR0 - Control Register 0 */
uint32_t br; /* 1001 LEDDBR - Pre-scale Register */
uint32_t onr; /* 1010 LEDONR - ON Time Register */
uint32_t ofr; /* 1011 LEDOFR - OFF Time Register */
} __attribute__((packed,aligned(4)));
#define LEDDA_IP_CR0_LEDDEN (1 << 7)
#define LEDDA_IP_CR0_FR250 (1 << 6)
#define LEDDA_IP_CR0_OUTPOL (1 << 5)
#define LEDDA_IP_CR0_OUTSKEW (1 << 4)
#define LEDDA_IP_CR0_QUICK_STOP (1 << 3)
#define LEDDA_IP_CR0_PWM_LINEAR (0 << 2)
#define LEDDA_IP_CR0_PWM_LFSR (1 << 2)
#define LEDDA_IP_CR0_SCALE_MSB(x) (((x) >> 8) & 3)
#define LEDDA_IP_BR_SCALE_LSB(x) ((x) & 0xff)
#define LEDDA_IP_ONOFF_TIME_MS(x) (((x) >> 5) & 0xff) /* 32ms interval up to 8s */
#define LEDDA_IP_BREATHE_ENABLE (1 << 7)
#define LEDDA_IP_BREATHE_MODULATE (1 << 5)
#define LEDDA_IP_BREATHE_TIME_MS(x) (((x) >> 7) & 0x0f) /* 128ms interval up to 2s */
struct led {
uint32_t csr;
uint32_t _rsvd[15];
struct ledda_ip ip;
} __attribute__((packed,aligned(4)));
#define LED_CSR_LEDDEXE (1 << 1)
#define LED_CSR_RGBLEDEN (1 << 2)
#define LED_CSR_CURREN (1 << 3)
static volatile struct led * const led_regs = (void*)(LED_BASE);
static const uint32_t led_cr0_base =
LEDDA_IP_CR0_FR250 |
LEDDA_IP_CR0_OUTSKEW |
LEDDA_IP_CR0_QUICK_STOP |
LEDDA_IP_CR0_PWM_LFSR |
LEDDA_IP_CR0_SCALE_MSB(480);
void
led_init(void)
{
led_regs->ip.pwrr = 0;
led_regs->ip.pwrg = 0;
led_regs->ip.pwrb = 0;
led_regs->ip.bcrr = 0;
led_regs->ip.bcfr = 0;
led_regs->ip.onr = 0;
led_regs->ip.ofr = 0;
led_regs->ip.br = LEDDA_IP_BR_SCALE_LSB(480);
led_regs->ip.cr0 = led_cr0_base;
led_regs->csr = LED_CSR_LEDDEXE | LED_CSR_RGBLEDEN | LED_CSR_CURREN;
}
void
led_color(uint8_t r, uint8_t g, uint8_t b)
{
#if defined(BOARD_ICE1USB)
// icE1usb
led_regs->ip.pwrr = b;
led_regs->ip.pwrg = g;
led_regs->ip.pwrb = r;
#elif defined(BOARD_ICE1USB_PROTO_ICEBREAKER)
// iCEBreaker v1.0b tnt
led_regs->ip.pwrr = r;
led_regs->ip.pwrg = b;
led_regs->ip.pwrb = g;
/*
// iCEBreaker v1.0c+
led_regs->ip.pwrr = b;
led_regs->ip.pwrg = g;
led_regs->ip.pwrb = r;
*/
#elif defined(BOARD_ICE1USB_PROTO_BITSY)
// iCEBreaker bitsy v0 (RGB led 'hacked on')
led_regs->ip.pwrr = g;
led_regs->ip.pwrg = r;
led_regs->ip.pwrb = b;
#elif defined(BOARD_E1_TRACER)
// E1 tracer
led_regs->ip.pwrr = b;
led_regs->ip.pwrg = g;
led_regs->ip.pwrb = r;
#else
// Default / Unknown
led_regs->ip.pwrr = r;
led_regs->ip.pwrg = g;
led_regs->ip.pwrb = b;
#endif
}
void
led_state(bool on)
{
if (on)
led_regs->ip.cr0 = led_cr0_base | LEDDA_IP_CR0_LEDDEN;
else
led_regs->ip.cr0 = led_cr0_base;
}
void
led_blink(bool enabled, int on_time_ms, int off_time_ms)
{
/* Disable EXE before doing any change */
led_regs->csr = LED_CSR_RGBLEDEN | LED_CSR_CURREN;
/* Load new config */
if (enabled) {
led_regs->ip.onr = LEDDA_IP_ONOFF_TIME_MS(on_time_ms);
led_regs->ip.ofr = LEDDA_IP_ONOFF_TIME_MS(off_time_ms);
} else {
led_regs->ip.onr = 0;
led_regs->ip.ofr = 0;
}
/* Re-enable execution */
led_regs->csr = LED_CSR_LEDDEXE | LED_CSR_RGBLEDEN | LED_CSR_CURREN;
}
void
led_breathe(bool enabled, int rise_time_ms, int fall_time_ms)
{
if (enabled) {
led_regs->ip.bcrr = LEDDA_IP_BREATHE_ENABLE |
LEDDA_IP_BREATHE_MODULATE |
LEDDA_IP_BREATHE_TIME_MS(rise_time_ms);
led_regs->ip.bcfr = LEDDA_IP_BREATHE_ENABLE |
LEDDA_IP_BREATHE_MODULATE |
LEDDA_IP_BREATHE_TIME_MS(fall_time_ms);
} else {
led_regs->ip.bcrr = 0;
led_regs->ip.bcfr = 0;
}
}

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firmware/ice40-riscv/common/led.h
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/*
* led.h
*
* Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com>
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#pragma once
#include <stdbool.h>
void led_init(void);
void led_color(uint8_t r, uint8_t g, uint8_t b);
void led_state(bool on);
void led_blink(bool enabled, int on_time_ms, int off_time_ms);
void led_breathe(bool enabled, int rise_time_ms, int fall_time_ms);

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firmware/ice40-riscv/common/lnk-app.lds
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MEMORY
{
SPRAM (xrw) : ORIGIN = 0x00020000, LENGTH = 0x10000
BRAM (xrw) : ORIGIN = 0x00000010, LENGTH = 0x03f0
}
ENTRY(_start)
SECTIONS {
.text :
{
. = ALIGN(4);
*(.text.start)
*(.text)
*(.text*)
*(.rodata)
*(.rodata*)
*(.srodata)
*(.srodata*)
. = ALIGN(4);
_etext = .;
_sidata = _etext;
} >SPRAM
.data : AT ( _sidata )
{
. = ALIGN(4);
_sdata = .;
_ram_start = .;
. = ALIGN(4);
*(.data)
*(.data*)
*(.sdata)
*(.sdata*)
. = ALIGN(4);
_edata = .;
} >SPRAM
.bss :
{
. = ALIGN(4);
_sbss = .;
*(.bss)
*(.bss*)
*(.sbss)
*(.sbss*)
*(COMMON)
. = ALIGN(4);
_ebss = .;
} >SPRAM
.heap :
{
. = ALIGN(4);
_heap_start = .;
} >SPRAM
}

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firmware/ice40-riscv/common/mini-printf.c
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/*
* The Minimal snprintf() implementation
*
* Copyright (c) 2013,2014 Michal Ludvig <michal@logix.cz>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the auhor 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 AUTHOR 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.
*
* ----
*
* This is a minimal snprintf() implementation optimised
* for embedded systems with a very limited program memory.
* mini_snprintf() doesn't support _all_ the formatting
* the glibc does but on the other hand is a lot smaller.
* Here are some numbers from my STM32 project (.bin file size):
* no snprintf(): 10768 bytes
* mini snprintf(): 11420 bytes (+ 652 bytes)
* glibc snprintf(): 34860 bytes (+24092 bytes)
* Wasting nearly 24kB of memory just for snprintf() on
* a chip with 32kB flash is crazy. Use mini_snprintf() instead.
*
*/
#include "mini-printf.h"
static unsigned int
mini_strlen(const char *s)
{
unsigned int len = 0;
while (s[len] != '\0') len++;
return len;
}
static unsigned int
mini_itoa(int value, unsigned int radix, unsigned int uppercase, unsigned int unsig,
char *buffer, unsigned int zero_pad)
{
char *pbuffer = buffer;
int negative = 0;
unsigned int i, len;
/* No support for unusual radixes. */
if (radix > 16)
return 0;
if (value < 0 && !unsig) {
negative = 1;
value = -value;
}
/* This builds the string back to front ... */
do {
int digit = value % radix;
*(pbuffer++) = (digit < 10 ? '0' + digit : (uppercase ? 'A' : 'a') + digit - 10);
value /= radix;
} while (value > 0);
for (i = (pbuffer - buffer); i < zero_pad; i++)
*(pbuffer++) = '0';
if (negative)
*(pbuffer++) = '-';
*(pbuffer) = '\0';
/* ... now we reverse it (could do it recursively but will
* conserve the stack space) */
len = (pbuffer - buffer);
for (i = 0; i < len / 2; i++) {
char j = buffer[i];
buffer[i] = buffer[len-i-1];
buffer[len-i-1] = j;
}
return len;
}
struct mini_buff {
char *buffer, *pbuffer;
unsigned int buffer_len;
};
static int
_putc(int ch, struct mini_buff *b)
{
if ((unsigned int)((b->pbuffer - b->buffer) + 1) >= b->buffer_len)
return 0;
*(b->pbuffer++) = ch;
*(b->pbuffer) = '\0';
return 1;
}
static int
_puts(char *s, unsigned int len, struct mini_buff *b)
{
unsigned int i;
if (b->buffer_len - (b->pbuffer - b->buffer) - 1 < len)
len = b->buffer_len - (b->pbuffer - b->buffer) - 1;
/* Copy to buffer */
for (i = 0; i < len; i++)
*(b->pbuffer++) = s[i];
*(b->pbuffer) = '\0';
return len;
}
int
mini_vsnprintf(char *buffer, unsigned int buffer_len, const char *fmt, va_list va)
{
struct mini_buff b;
char bf[24];
char ch;
b.buffer = buffer;
b.pbuffer = buffer;
b.buffer_len = buffer_len;
while ((ch=*(fmt++))) {
if ((unsigned int)((b.pbuffer - b.buffer) + 1) >= b.buffer_len)
break;
if (ch!='%')
_putc(ch, &b);
else {
char zero_pad = 0;
char *ptr;
unsigned int len;
ch=*(fmt++);
/* Zero padding requested */
if (ch=='0') {
ch=*(fmt++);
if (ch == '\0')
goto end;
if (ch >= '0' && ch <= '9')
zero_pad = ch - '0';
ch=*(fmt++);
}
switch (ch) {
case 0:
goto end;
case 'u':
case 'd':
len = mini_itoa(va_arg(va, unsigned int), 10, 0, (ch=='u'), bf, zero_pad);
_puts(bf, len, &b);
break;
case 'x':
case 'X':
len = mini_itoa(va_arg(va, unsigned int), 16, (ch=='X'), 1, bf, zero_pad);
_puts(bf, len, &b);
break;
case 'c' :
_putc((char)(va_arg(va, int)), &b);
break;
case 's' :
ptr = va_arg(va, char*);
_puts(ptr, mini_strlen(ptr), &b);
break;
default:
_putc(ch, &b);
break;
}
}
}
end:
return b.pbuffer - b.buffer;
}
int
mini_snprintf(char* buffer, unsigned int buffer_len, const char *fmt, ...)
{
int ret;
va_list va;
va_start(va, fmt);
ret = mini_vsnprintf(buffer, buffer_len, fmt, va);
va_end(va);
return ret;
}

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firmware/ice40-riscv/common/mini-printf.h
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/*
* The Minimal snprintf() implementation
*
* Copyright (c) 2013 Michal Ludvig <michal@logix.cz>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the auhor 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