Hi fellows!
Excuse my english.
I have a NVIC bug on stm32f030F4 revision codes A, stm32f051C8 rc B, stm32f100RB rc Z, stm32f303VC rc YThis is assembler code for stm32f051C8
GET ../inc/stm32f0xx.asm Stack_Size * 0x00000400 AREA STACK, NOINIT, READWRITE, ALIGN=3 Stack_Mem % Stack_Size __initial_sp PRESERVE8 THUMB AREA RESET, DATA, READONLY GLOBAL __Vectors __Vectors & __initial_sp & Reset_Handler & NMI_Handler & HardFault_Handler & 0 & 0 & 0 & 0 & 0 & 0 & 0 & SVC_Handler & 0 & 0 & PendSV_Handler & SysTick_Handler & WWDG_ ;1 0x00 & PVD_ ;2 & RTC_ ;4 & FLASH_ ;8 & RCC_ ;16 & EXTI0_1_ ;32 & EXTI2_3_ ;64 & EXTI4_15_ ;128 & TSC_ ;1 0x01 & DMA1_Channel1_ ;2 & DMA1_Channel2_3_ ;4 & DMA1_Channel4_5_ ;8 & ADC1_COMP_ ;16 & TIM1_BRK_UP_TRG_COM_ ;32 & TIM1_CC_ ;64 & TIM2_ ;128 & TIM3_ ;1 0x02 & TIM6_DAC_ ;2 & 0 & TIM14_ ;8 & TIM15_ ;16 & TIM16_ ;32 & TIM17_ ;64 & I2C1_ ;128 & I2C2_ ;1 0x03 & SPI1_ ;2 & SPI2_ ;4 & USART1_ ;8 & USART2_ ;16 & 0 & CEC_ ;64 AREA mainCode, CODE, READONLY Reset_Handler PROC GLOBAL Reset_Handler ;Initilization Port А USART2 ldr r0,=0x40021000 ;RCC_CR movs r1,#2_10 strb r1,[r0,#0x16] ;set bits IOPAEN&IOP in RCC_AHBENR movs r1,#2_10 strb r1,[r0,#0x1E] ;set bit USART2EN in RCC_APB1ENR ;set division APB/(0...16) movs r1,#0x04 strb r1,[r0,#0x05] ;Configure io pins ldr r0,=0x48000000 ;GPIOA_MODER movs r1,#4_2210 strb r1,[r0] ;PA1 as OUT push-pull ldr r1,=0x1100 strh r1,[r0,#0x20] ;PA1-TX PA2-RX ;Enable extern interrupt on pin PA0 cpsid i ldr r0,=0xE000E100 ;NVIC_ISER ldr r1,=(0x20+0x08000000) str r1,[r0] ;enable EXTI0_1_ & USART1_ ldr r0,=0x40010400 ;EXTI_IMR ldr r1,=0x0F940001 str r1,[r0] ;interrupt on pin0 is't masked movs r1,#1 str r1,[r0,#0x08] ;interrupt on risig str r1,[r0,#0x14] ;clear pending interrupt on pin A0 - just in case :) cpsie i B . ALIGN ENDP EXTI0_1_ PROC cpsid i ldr r2,=0x48000018 ;GPIOA_BSRR movs r1,#2_10 strb r1,[r2] ldr r0,=0x40004428 ;USART2_TDR movs r1,#2_01010101 str r1,[r0] ldr r1,=0x7A1200 LedIRQ subs r1,#1 BNE LedIRQ movs r1,#2_10 strb r1,[r2,#0x02] ldr r0,=EXTI_PR movs r1,#1 str r1,[r0] cpsie i BX LR ALIGN ENDP NMI_Handler PROC GLOBAL NMI_Handler B . ENDP HardFault_Handler PROC GLOBAL HardFault_Handler B . ENDP SVC_Handler PROC GLOBAL SVC_Handler B . ENDP PendSV_Handler PROC GLOBAL PendSV_Handler B . ENDP SysTick_Handler PROC GLOBAL SysTick_Handler B . ENDP Default_Handler PROC GLOBAL WWDG_ GLOBAL PVD_ GLOBAL RTC_ GLOBAL FLASH_ GLOBAL RCC_ GLOBAL EXTI0_1_ GLOBAL EXTI2_3_ GLOBAL EXTI4_15_ GLOBAL TSC_ GLOBAL DMA1_Channel1_ GLOBAL DMA1_Channel2_3_ GLOBAL DMA1_Channel4_5_ GLOBAL ADC1_COMP_ GLOBAL TIM1_BRK_UP_TRG_COM_ GLOBAL TIM1_CC_ GLOBAL TIM2_ GLOBAL TIM3_ GLOBAL TIM6_DAC_ GLOBAL TIM14_ GLOBAL TIM15_ GLOBAL TIM16_ GLOBAL TIM17_ GLOBAL I2C1_ GLOBAL I2C2_ GLOBAL SPI1_ GLOBAL SPI2_ GLOBAL USART1_ GLOBAL USART2_ GLOBAL CEC_ WWDG_ PVD_ RTC_ FLASH_ RCC_ ;EXTI0_1_ EXTI2_3_ EXTI4_15_ TSC_ DMA1_Channel1_ DMA1_Channel2_3_ DMA1_Channel4_5_ ADC1_COMP_ TIM1_BRK_UP_TRG_COM_ TIM1_CC_ TIM2_ TIM3_ TIM6_DAC_ TIM14_ TIM15_ TIM16_ TIM17_ I2C1_ I2C2_ SPI1_ SPI2_ USART1_ USART2_ CEC_ B . ENDP ALIGN END
LED connect to PA1, button to PA0. When I press the button, the LED is lit for 4 second, if PPRE[2:0] = 0 or 2_100. If PPRE[2:0] = 2_101 and hight LED is lin 8 sec.