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add minimal support files for a Nordic bootloader.

pull/488/head
Rohit Grover 2014-09-09 11:14:23 +01:00
parent f50e6f3269
commit 99d14db8c1
2 changed files with 172 additions and 0 deletions
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91
libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/Lib/bootloader_dfu/bootloader_util_arm.c Executable file
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/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
#include "bootloader_util.h"
#include <stdint.h>
/**
* @brief Function for aborting current handler mode and jump to to other application/bootloader.
*
* @details This functions will use the address provide (reset handler) to be executed after
* handler mode is exited. It creates an initial stack to ensure correct reset behavior
* when the reset handler is executed.
*
* @param[in] reset_handler Address of the reset handler to be executed when handler mode exits.
*
* @note This function must never be called directly from 'C' but is intended only to be used from
* \ref bootloader_util_reset. This function will never return but issue a reset into
* provided address.
*/
__asm void isr_abort(uint32_t reset_handler)
{
xPSR_RESET EQU 0x21000000 ; Default value of xPSR after System Reset.
EXC_RETURN_CMD EQU 0xFFFFFFF9 ; EXC_RETURN for ARM Cortex. When loaded to PC the current interrupt service routine (handler mode) willl exit and the stack will be popped. Execution will continue in thread mode.
LDR R4,=MASK_ONES ; Fill with ones before jumping to reset handling. We be popped as R12 when exiting ISR (Cleaning up the registers).
LDR R5,=MASK_ONES ; Fill with ones before jumping to reset handling. We be popped as LR when exiting ISR. Ensures no return to application.
MOV R6, R0 ; Move address of reset handler to R6. Will be popped as PC when exiting ISR. Ensures the reset handler will be executed when exist ISR.
LDR R7,=xPSR_RESET ; Move reset value of xPSR to R7. Will be popped as xPSR when exiting ISR.
PUSH {r4-r7} ; Push everything to new stack to allow interrupt handler to fetch it on exiting the ISR.
LDR R4,=MASK_ZEROS ; Fill with zeros before jumping to reset handling. We be popped as R0 when exiting ISR (Cleaning up of the registers).
LDR R5,=MASK_ZEROS ; Fill with zeros before jumping to reset handling. We be popped as R1 when exiting ISR (Cleaning up of the registers).
LDR R6,=MASK_ZEROS ; Fill with zeros before jumping to reset handling. We be popped as R2 when exiting ISR (Cleaning up of the registers).
LDR R7,=MASK_ZEROS ; Fill with zeros before jumping to reset handling. We be popped as R3 when exiting ISR (Cleaning up of the registers).
PUSH {r4-r7} ; Push zeros (R4-R7) to stack to prepare for exiting the interrupt routine.
LDR R0,=EXC_RETURN_CMD ; Load the execution return command into register.
BX R0 ; No return - Handler mode will be exited. Stack will be popped and execution will continue in reset handler initializing other application.
ALIGN
}
/**
* @brief Function for aborting current application/bootloader jump to to other app/bootloader.
*
* @details This functions will use the address provide to swap the stack pointer and then load
* the address of the reset handler to be executed. It will check current system mode
* (thread/handler) and if in thread mode it will reset into other application.
* If in handler mode \ref isr_abort will be executed to ensure correct exit of handler
* mode and jump into reset handler of other application.
*
* @param[in] start_addr Start address of other application. This address must point to the
initial stack pointer of the application.
*
* @note This function will never return but issue a reset into provided application.
*/
__asm static void bootloader_util_reset(uint32_t start_addr)
{
MASK_ONES EQU 0xFFFFFFFF ; Ones, to be loaded into register as default value before reset.
MASK_ZEROS EQU 0x00000000 ; Zeros, to be loaded into register as default value before reset.
LDR R1, [R0] ; Get App initial MSP for bootloader.
MSR MSP, R1 ; Set the main stack pointer to the applications MSP.
LDR R0,[R0, #0x04] ; Load Reset handler into register 0.
LDR R2, =MASK_ZEROS ; Load zeros to R2
MRS R3, IPSR ; Load IPSR to R3 to check for handler or thread mode
CMP R2, R3 ; Compare, if 0 then we are in thread mode and can continue to reset handler of bootloader
BNE isr_abort ; If not zero we need to exit current ISR and jump to reset handler of bootloader
LDR R4, =MASK_ONES ; Load ones to R4 to be placed in Link Register.
MOV LR, R4 ; Clear the link register and set to ones to ensure no return.
BX R0 ; Branch to reset handler of bootloader
ALIGN
}
void bootloader_util_app_start(uint32_t start_addr)
{
bootloader_util_reset(start_addr);
}

81
libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/Lib/bootloader_dfu/dfu_app_handler.c Executable file
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/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
#include "dfu_app_handler.h"
#include "bootloader_util.h"
#include "nrf_sdm.h"
#include "app_error.h"
#define IRQ_ENABLED 0x01 /**< Field identifying if an interrupt is enabled. */
#define MAX_NUMBER_INTERRUPTS 32 /**< Maximum number of interrupts available. */
static void dfu_app_reset_prepare(void); /**< Forward declare of default reset handler. */
static dfu_app_reset_prepare_t m_reset_prepare = dfu_app_reset_prepare; /**< Callback function to application to prepare for system reset. Allows application to cleanup of service and memory prior to reset. */
/**@brief Default reset prepare handler if application hasn't registered a handler.
*/
static void dfu_app_reset_prepare(void)
{
// Reset prepare should be handled by application.
// This function can be extended to include default handling if application does not implement
// own handler.
}
/**@brief Function for disabling all interrupts before jumping from bootloader to application.
*/
static void interrupts_disable(void)
{
uint32_t interrupt_setting_mask;
uint32_t irq = 0; // We start from first interrupt, i.e. interrupt 0.
// Fetch the current interrupt settings.
interrupt_setting_mask = NVIC->ISER[0];
for (; irq < MAX_NUMBER_INTERRUPTS; irq++)
{
if (interrupt_setting_mask & (IRQ_ENABLED << irq))
{
// The interrupt was enabled, and hence disable it.
NVIC_DisableIRQ((IRQn_Type)irq);
}
}
}
/**@brief Function for preparing the reset, disabling SoftDevice and jump to the bootloader.
*/
void bootloader_start(void)
{
m_reset_prepare();
uint32_t err_code = sd_power_gpregret_set(BOOTLOADER_DFU_START);
APP_ERROR_CHECK(err_code);
err_code = sd_softdevice_disable();
APP_ERROR_CHECK(err_code);
interrupts_disable();
err_code = sd_softdevice_vector_table_base_set(NRF_UICR->BOOTLOADERADDR);
APP_ERROR_CHECK(err_code);
bootloader_util_app_start(NRF_UICR->BOOTLOADERADDR);
}
void dfu_app_reset_prepare_set(dfu_app_reset_prepare_t reset_prepare_func)
{
m_reset_prepare = reset_prepare_func;
}