Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Bug 1668 v2 - Provide method to prevent init of SYS_CLK, when left on during 'lightsleep' #1672

Draft
wants to merge 4 commits into
base: develop
Choose a base branch
from
Draft

Bug 1668 v2 - Provide method to prevent init of SYS_CLK, when left on during 'lightsleep' #1672

Show file tree
Hide file tree
Changes from 2 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
62f9de1
Bug 1668: Provide method to prevent init of SYS_CLK, when left on dur…
mungewell Mar 18, 2024
33dad93
Logical 'and' (&&) and DoxyGen doc.
mungewell Mar 20, 2024
d688752
Re-add 'void', create/use 'init_sys_clock' bool
mungewell Mar 21, 2024
2c57ce9
Remove tabs
mungewell Mar 23, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
77 changes: 67 additions & 10 deletions src/rp2_common/hardware_clocks/clocks.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,51 @@
// customary 32 or 32.768kHz 'slow clock' crystals and provides good timing resolution.
#define RTC_CLOCK_FREQ_HZ (USB_CLK_KHZ * KHZ / 1024)

// Clocks which are dependant on CLK_SYS
#define CLOCKS_SLEEP_EN0_CLK_SYS_DEPENDANTS_BITS ( \
CLOCKS_SLEEP_EN0_CLK_SYS_SRAM3_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SRAM2_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SRAM1_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SRAM0_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SPI1_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SPI0_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_SIO_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_RTC_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_ROSC_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_ROM_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_RESETS_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PWM_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PSM_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PLL_USB_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PLL_SYS_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PIO1_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PIO0_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_PADS_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_VREG_AND_CHIP_RESET_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_JTAG_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_IO_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_I2C1_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_I2C0_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_DMA_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_BUSFABRIC_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_BUSCTRL_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_ADC_BITS | \
CLOCKS_SLEEP_EN0_CLK_SYS_CLOCKS_BITS )

#define CLOCKS_SLEEP_EN1_CLK_SYS_DEPENDANTS_BITS ( \
CLOCKS_SLEEP_EN1_CLK_SYS_XOSC_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_XIP_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_WATCHDOG_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_USBCTRL_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_UART1_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_UART0_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_TIMER_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_TBMAN_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_SYSINFO_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_SYSCFG_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_SRAM5_BITS | \
CLOCKS_SLEEP_EN1_CLK_SYS_SRAM4_BITS )

check_hw_layout(clocks_hw_t, clk[clk_adc].selected, CLOCKS_CLK_ADC_SELECTED_OFFSET);
check_hw_layout(clocks_hw_t, fc0.result, CLOCKS_FC0_RESULT_OFFSET);
check_hw_layout(clocks_hw_t, ints, CLOCKS_INTS_OFFSET);
Expand Down Expand Up @@ -118,7 +163,11 @@ bool clock_configure(enum clock_index clk_index, uint32_t src, uint32_t auxsrc,
}
/// \end::clock_configure[]

void clocks_init(void) {
void clocks_init() {
lurch marked this conversation as resolved.
Show resolved Hide resolved
clocks_reinit(0, 0);
}

void clocks_reinit(uint32_t sleep_en0, uint32_t sleep_en1) {
// Start tick in watchdog, the argument is in 'cycles per microsecond' i.e. MHz
watchdog_start_tick(XOSC_KHZ / KHZ);

Expand All @@ -138,15 +187,20 @@ void clocks_init(void) {
xosc_init();

// Before we touch PLLs, switch sys and ref cleanly away from their aux sources.
hw_clear_bits(&clocks_hw->clk[clk_sys].ctrl, CLOCKS_CLK_SYS_CTRL_SRC_BITS);
while (clocks_hw->clk[clk_sys].selected != 0x1)
tight_loop_contents();
if (((sleep_en0 & CLOCKS_SLEEP_EN0_CLK_SYS_DEPENDANTS_BITS) == 0) &&
((sleep_en1 & CLOCKS_SLEEP_EN1_CLK_SYS_DEPENDANTS_BITS) == 0)) {
hw_clear_bits(&clocks_hw->clk[clk_sys].ctrl, CLOCKS_CLK_SYS_CTRL_SRC_BITS);
while (clocks_hw->clk[clk_sys].selected != 0x1)
tight_loop_contents();
}
hw_clear_bits(&clocks_hw->clk[clk_ref].ctrl, CLOCKS_CLK_REF_CTRL_SRC_BITS);
while (clocks_hw->clk[clk_ref].selected != 0x1)
tight_loop_contents();

/// \tag::pll_init[]
pll_init(pll_sys, PLL_COMMON_REFDIV, PLL_SYS_VCO_FREQ_KHZ * KHZ, PLL_SYS_POSTDIV1, PLL_SYS_POSTDIV2);
if (((sleep_en0 & CLOCKS_SLEEP_EN0_CLK_SYS_DEPENDANTS_BITS) == 0) &&
((sleep_en1 & CLOCKS_SLEEP_EN1_CLK_SYS_DEPENDANTS_BITS) == 0))
pll_init(pll_sys, PLL_COMMON_REFDIV, PLL_SYS_VCO_FREQ_KHZ * KHZ, PLL_SYS_POSTDIV1, PLL_SYS_POSTDIV2);
pll_init(pll_usb, PLL_COMMON_REFDIV, PLL_USB_VCO_FREQ_KHZ * KHZ, PLL_USB_POSTDIV1, PLL_USB_POSTDIV2);
/// \end::pll_init[]

Expand All @@ -160,11 +214,14 @@ void clocks_init(void) {

/// \tag::configure_clk_sys[]
// CLK SYS = PLL SYS (usually) 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,
SYS_CLK_KHZ * KHZ,
SYS_CLK_KHZ * KHZ);
if (((sleep_en0 & CLOCKS_SLEEP_EN0_CLK_SYS_DEPENDANTS_BITS) == 0) &&
lurch marked this conversation as resolved.
Show resolved Hide resolved
((sleep_en1 & CLOCKS_SLEEP_EN1_CLK_SYS_DEPENDANTS_BITS) == 0)) {
clock_configure(clk_sys,
CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,
CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS,
SYS_CLK_KHZ * KHZ,
SYS_CLK_KHZ * KHZ);
}
/// \end::configure_clk_sys[]

// CLK USB = PLL USB 48MHz / 1 = 48MHz
Expand Down
9 changes: 9 additions & 0 deletions src/rp2_common/hardware_clocks/include/hardware/clocks.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,15 @@ extern "C" {
*/
void clocks_init(void);

/*! \brief Re-initialise the clock hardware
* \ingroup hardware_clocks
*
* During a 'lightsleep()' some clocks may have been deliberately left running.
lurch marked this conversation as resolved.
Show resolved Hide resolved
* By specifying 'sleep_en0' and 'sleep_en1', it can be automatically determined
* that SYS_CLK (and/or it's dependants) is running and thus it is not re-initialised.
*/
void clocks_reinit(uint32_t sleep_en0, uint32_t sleep_en1);
lurch marked this conversation as resolved.
Show resolved Hide resolved

/*! \brief Configure the specified clock
* \ingroup hardware_clocks
*
Expand Down