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Initial Release

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This commit is contained in:
graham sanderson
2021-01-20 10:44:27 -06:00
commit 26653ea81e
404 changed files with 135614 additions and 0 deletions
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45
src/rp2_common/pico_stdlib/CMakeLists.txt Normal file
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# PICO_CMAKE_CONFIG: PICO_STDIO_UART, OPTION: Globally enable stdio UART, default=1, group=pico_stdlib
option(PICO_STDIO_UART "Globablly enable stdio UART" 1)
# PICO_CMAKE_CONFIG: PICO_STDIO_USB, OPTION: Globally enable stdio USB, default=0, group=pico_stdlib
option(PICO_STDIO_USB "Globablly enable stdio USB" 0)
# PICO_CMAKE_CONFIG: PICO_STDIO_USB, OPTIONS: Globally enable stdio semihosting, default=0, group=pico_stdlib
option(PICO_STDIO_USB "Globablly enable stdio semihosting " 0)
if (NOT TARGET pico_stdlib)
add_library(pico_stdlib INTERFACE)
target_sources(pico_stdlib INTERFACE
${CMAKE_CURRENT_LIST_DIR}/stdlib.c
)
target_link_libraries(pico_stdlib INTERFACE
pico_stdlib_headers
pico_platform
pico_runtime
pico_stdio
pico_time
)
function(pico_enable_stdio_uart TARGET ENABLED)
set_target_properties(${TARGET} PROPERTIES PICO_TARGET_STDIO_UART ${ENABLED})
endfunction()
function(pico_enable_stdio_usb TARGET ENABLED)
set_target_properties(${TARGET} PROPERTIES PICO_TARGET_STDIO_USB ${ENABLED})
endfunction()
function(pico_enable_stdio_semihosting TARGET ENABLED)
set_target_properties(${TARGET} PROPERTIES PICO_TARGET_STDIO_SEMIHOSTING ${ENABLED})
endfunction()
if (TARGET pico_stdio_uart)
target_link_libraries(pico_stdlib INTERFACE $<IF:$<BOOL:$<IF:$<STREQUAL:$<TARGET_PROPERTY:PICO_TARGET_STDIO_UART>,>,${PICO_STDIO_UART},$<TARGET_PROPERTY:PICO_TARGET_STDIO_UART>>>,pico_stdio_uart,>)
endif()
if (TARGET pico_stdio_usb)
target_link_libraries(pico_stdlib INTERFACE $<IF:$<BOOL:$<IF:$<STREQUAL:$<TARGET_PROPERTY:PICO_TARGET_STDIO_USB>,>,${PICO_STDIO_USB},$<TARGET_PROPERTY:PICO_TARGET_STDIO_USB>>>,pico_stdio_usb,>)
endif()
if (TARGET pico_stdio_semihosting)
target_link_libraries(pico_stdlib INTERFACE $<IF:$<BOOL:$<IF:$<STREQUAL:$<TARGET_PROPERTY:PICO_TARGET_STDIO_SEMIHOSTING>,>,${PICO_STDIO_SEMIHOSTING},$<TARGET_PROPERTY:PICO_TARGET_STDIO_SEMIHOSTING>>>,pico_stdio_semihosting,>)
endif()
endif()

104
src/rp2_common/pico_stdlib/stdlib.c Normal file
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/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "pico/stdlib.h"
#include "hardware/pll.h"
#include "hardware/clocks.h"
#if PICO_STDIO_UART
#include "pico/stdio_uart.h"
#else
#include "pico/binary_info.h"
#endif
// everything running off the USB oscillator
void set_sys_clock_48mhz() {
if (!running_on_fpga()) {
// Change clk_sys to be 48MHz. The simplest way is to take this from PLL_USB
// which has a source frequency of 48MHz
clock_configure(clk_sys,
CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,
CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB,
48 * MHZ,
48 * MHZ);
// Turn off PLL sys for good measure
pll_deinit(pll_sys);
// CLK peri is clocked from clk_sys so need to change clk_peri's freq
clock_configure(clk_peri,
0,
CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS,
48 * MHZ,
48 * MHZ);
}
}
void set_sys_clock_pll(uint32_t vco_freq, uint post_div1, uint post_div2) {
if (!running_on_fpga()) {
clock_configure(clk_sys,
CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,
CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB,
48 * MHZ,
48 * MHZ);
pll_init(pll_sys, 1, vco_freq, post_div1, post_div2);
uint32_t freq = vco_freq / (post_div1 * post_div2);
// Configure clocks
// CLK_REF = XOSC (12MHz) / 1 = 12MHz
clock_configure(clk_ref,
CLOCKS_CLK_REF_CTRL_SRC_VALUE_XOSC_CLKSRC,
0, // No aux mux
12 * MHZ,
12 * MHZ);
// CLK SYS = PLL SYS (125MHz) / 1 = 125MHz
clock_configure(clk_sys,
CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,
CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS,
freq, freq);
clock_configure(clk_peri,
0, // Only AUX mux on ADC
CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB,
48 * MHZ,
48 * MHZ);
}
}
bool check_sys_clock_khz(uint32_t freq_khz, uint *vco_out, uint *postdiv1_out, uint *postdiv_out) {
uint crystal_freq_khz = clock_get_hz(clk_ref) / 1000;
for (uint fbdiv = 320; fbdiv >= 16; fbdiv--) {
uint vco = fbdiv * crystal_freq_khz;
if (vco < 400000 || vco > 1600000) continue;
for (uint postdiv1 = 7; postdiv1 >= 1; postdiv1--) {
for (uint postdiv2 = postdiv1; postdiv2 >= 1; postdiv2--) {
uint out = vco / (postdiv1 * postdiv2);
if (out == freq_khz && !(vco % (postdiv1 * postdiv2))) {
*vco_out = vco * 1000;
*postdiv1_out = postdiv1;
*postdiv_out = postdiv2;
return true;
}
}
}
}
return false;
}
void setup_default_uart() {
#if PICO_STDIO_UART
stdio_uart_init();
#elif defined(PICO_DEFAULT_UART_BAUD_RATE) && defined(PICO_DEFAULT_UART_TX_PIN) && defined(PICO_DEFAULT_UART_RX_PIN)
// this is mostly for backwards compatibility - stdio_uart_init is a bit more nuanced, and usually likely to be present
uart_init(uart_default, PICO_DEFAULT_UART_BAUD_RATE);
if (PICO_DEFAULT_UART_TX_PIN >= 0)
gpio_set_function(PICO_DEFAULT_UART_TX_PIN, GPIO_FUNC_UART);
if (PICO_DEFAULT_UART_RX_PIN >= 0)
gpio_set_function(PICO_DEFAULT_UART_RX_PIN, GPIO_FUNC_UART);
bi_decl_if_func_used(bi_2pins_with_func(PICO_DEFAULT_UART_RX_PIN, PICO_DEFAULT_UART_TX_PIN, GPIO_FUNC_UART));
#endif
}