hardware_resets

Hardware Reset API. More...

Functions
static void	reset_block (uint32_t bits)
	Reset the specified HW blocks. More...
static void	unreset_block (uint32_t bits)
	bring specified HW blocks out of reset More...
static void	unreset_block_wait (uint32_t bits)
	Bring specified HW blocks out of reset and wait for completion. More...

Detailed Description

Hardware Reset API.

The reset controller allows software control of the resets to all of the peripherals that are not critical to boot the processor in the RP2040.

reset_bitmask

Multiple blocks are referred to using a bitmask as follows:

Block to reset	Bit
USB	24
UART 1	23
UART 0	22
Timer	21
TB Manager	20
SysInfo	19
System Config	18
SPI 1	17
SPI 0	16
RTC	15
PWM	14
PLL USB	13
PLL System	12
PIO 1	11
PIO 0	10
Pads - QSPI	9
Pads - bank 0	8
JTAG	7
IO Bank 1	6
IO Bank 0	5
I2C 1	4
I2C 0	3
DMA	2
Bus Control	1
ADC 0	0

Example

 
#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/resets.h"
 
int main() {
    stdio_init_all();
 
    printf("Hello, reset!\n");
 
    // Put the PWM block into reset
    reset_block(RESETS_RESET_PWM_BITS);
 
    // And bring it out
    unreset_block_wait(RESETS_RESET_PWM_BITS);
 
    // Put the PWM and RTC block into reset
    reset_block(RESETS_RESET_PWM_BITS | RESETS_RESET_RTC_BITS);
 
    // Wait for both to come out of reset
    unreset_block_wait(RESETS_RESET_PWM_BITS | RESETS_RESET_RTC_BITS);
 
    return 0;
}

Function Documentation

reset_block()

static void reset_block ( uint32_t  bits )

inlinestatic

Reset the specified HW blocks.

Parameters

bits	Bit pattern indicating blocks to reset. See reset_bitmask

unreset_block()

static void unreset_block ( uint32_t  bits )

inlinestatic

bring specified HW blocks out of reset

Parameters

bits	Bit pattern indicating blocks to unreset. See reset_bitmask

unreset_block_wait()

static void unreset_block_wait ( uint32_t  bits )

inlinestatic

Bring specified HW blocks out of reset and wait for completion.

Parameters

bits	Bit pattern indicating blocks to unreset. See reset_bitmask