diff options
| author | NIIBE Yutaka <gniibe@fsij.org> | 2014-12-10 16:18:29 +0900 |
|---|---|---|
| committer | NIIBE Yutaka <gniibe@fsij.org> | 2014-12-10 18:39:39 +0900 |
| commit | 23893d9b73ebc28ff111d21827122677c27bee55 (patch) | |
| tree | a887b7723395eb37abb244cbbd150dc7b4063e8d /example-led | |
| parent | 0276d0825ee27d1d5ecf238af0c9a2c053527125 (diff) | |
Version 0.04release/0.04
Diffstat (limited to 'example-led')
| -rw-r--r-- | example-led/sys.c | 70 |
1 files changed, 44 insertions, 26 deletions
diff --git a/example-led/sys.c b/example-led/sys.c index 75fe7d2..264df5e 100644 --- a/example-led/sys.c +++ b/example-led/sys.c @@ -1,7 +1,7 @@ /* * sys.c - system routines for the initial page for STM32F103. * - * Copyright (C) 2013 Flying Stone Technology + * Copyright (C) 2013, 2014 Flying Stone Technology * Author: NIIBE Yutaka <gniibe@fsij.org> * * Copying and distribution of this file, with or without modification, @@ -24,7 +24,9 @@ #define STM32_USB_IRQ_PRIORITY 11 +#define STM32_SW_HSI (0 << 0) #define STM32_SW_PLL (2 << 0) +#define STM32_PLLSRC_HSI (0 << 16) #define STM32_PLLSRC_HSE (1 << 16) #define STM32_PLLXTPRE_DIV1 (0 << 17) @@ -32,6 +34,7 @@ #define STM32_HPRE_DIV1 (0 << 4) +#define STM32_PPRE1_DIV1 (0 << 8) #define STM32_PPRE1_DIV2 (4 << 8) #define STM32_PPRE2_DIV1 (0 << 11) @@ -44,23 +47,23 @@ #define STM32_MCO_NOCLOCK (0 << 24) -#define STM32_SW STM32_SW_PLL +#define STM32_PPRE1 STM32_PPRE1_DIV2 #define STM32_PLLSRC STM32_PLLSRC_HSE +#define STM32_FLASHBITS 0x00000012 +#define STM32_PLLCLKIN (STM32_HSECLK / 1) + +#define STM32_SW STM32_SW_PLL #define STM32_HPRE STM32_HPRE_DIV1 -#define STM32_PPRE1 STM32_PPRE1_DIV2 #define STM32_PPRE2 STM32_PPRE2_DIV1 #define STM32_ADCPRE STM32_ADCPRE_DIV6 #define STM32_MCOSEL STM32_MCO_NOCLOCK #define STM32_USBPRE STM32_USBPRE_DIV1P5 -#define STM32_PLLCLKIN (STM32_HSECLK / 1) #define STM32_PLLMUL ((STM32_PLLMUL_VALUE - 2) << 18) #define STM32_PLLCLKOUT (STM32_PLLCLKIN * STM32_PLLMUL_VALUE) #define STM32_SYSCLK STM32_PLLCLKOUT #define STM32_HCLK (STM32_SYSCLK / 1) -#define STM32_FLASHBITS 0x00000012 - struct NVIC { uint32_t ISER[8]; uint32_t unused1[24]; @@ -92,8 +95,10 @@ nvic_enable_vector (uint32_t n, uint32_t prio) #define PERIPH_BASE 0x40000000 +#define APBPERIPH_BASE PERIPH_BASE #define APB2PERIPH_BASE (PERIPH_BASE + 0x10000) #define AHBPERIPH_BASE (PERIPH_BASE + 0x20000) +#define AHB2PERIPH_BASE (PERIPH_BASE + 0x08000000) struct RCC { volatile uint32_t CR; @@ -127,6 +132,18 @@ static struct RCC *const RCC = ((struct RCC *const)RCC_BASE); #define RCC_AHBENR_CRCEN 0x0040 +#define RCC_APB2RSTR_AFIORST 0x00000001 +#define RCC_APB2RSTR_IOPARST 0x00000004 +#define RCC_APB2RSTR_IOPBRST 0x00000008 +#define RCC_APB2RSTR_IOPCRST 0x00000010 +#define RCC_APB2RSTR_IOPDRST 0x00000020 + +#define RCC_APB2ENR_AFIOEN 0x00000001 +#define RCC_APB2ENR_IOPAEN 0x00000004 +#define RCC_APB2ENR_IOPBEN 0x00000008 +#define RCC_APB2ENR_IOPCEN 0x00000010 +#define RCC_APB2ENR_IOPDEN 0x00000020 + struct FLASH { volatile uint32_t ACR; volatile uint32_t KEYR; @@ -149,7 +166,8 @@ clock_init (void) RCC->CR |= RCC_CR_HSION; while (!(RCC->CR & RCC_CR_HSIRDY)) ; - RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION; + /* Reset HSEON, HSEBYP, CSSON, and PLLON, not touching RCC_CR_HSITRIM */ + RCC->CR &= (RCC_CR_HSITRIM | RCC_CR_HSION); RCC->CFGR = 0; while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI) ; @@ -169,6 +187,10 @@ clock_init (void) RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE | STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE; + /* + * We don't touch RCC->CR2, RCC->CFGR2, RCC->CFGR3, and RCC->CIR. + */ + /* Flash setup */ FLASH->ACR = STM32_FLASHBITS; @@ -181,18 +203,6 @@ clock_init (void) ; } -#define RCC_APB2RSTR_AFIORST 0x00000001 -#define RCC_APB2RSTR_IOPARST 0x00000004 -#define RCC_APB2RSTR_IOPBRST 0x00000008 -#define RCC_APB2RSTR_IOPCRST 0x00000010 -#define RCC_APB2RSTR_IOPDRST 0x00000020 - -#define RCC_APB2ENR_AFIOEN 0x00000001 -#define RCC_APB2ENR_IOPAEN 0x00000004 -#define RCC_APB2ENR_IOPBEN 0x00000008 -#define RCC_APB2ENR_IOPCEN 0x00000010 -#define RCC_APB2ENR_IOPDEN 0x00000020 - struct AFIO { @@ -207,6 +217,7 @@ struct AFIO static struct AFIO *const AFIO = (struct AFIO *const)AFIO_BASE; #define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800 +#define AFIO_MAPR_SWJ_CFG_DISABLE 0x04000000 struct GPIO { @@ -230,8 +241,10 @@ struct GPIO { #define GPIOE_BASE (APB2PERIPH_BASE + 0x1800) #define GPIOE ((struct GPIO *) GPIOE_BASE) -static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE); static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE); +#ifdef GPIO_USB_BASE +static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE); +#endif #ifdef GPIO_OTHER_BASE static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE); #endif @@ -240,8 +253,8 @@ static void gpio_init (void) { /* Enable GPIO clock. */ - RCC->APB2ENR |= RCC_APB2ENR_IOP_EN; - RCC->APB2RSTR = RCC_APB2RSTR_IOP_RST; + RCC->APB2ENR |= RCC_ENR_IOP_EN; + RCC->APB2RSTR = RCC_RSTR_IOP_RST; RCC->APB2RSTR = 0; #ifdef AFIO_MAPR_SOMETHING @@ -577,10 +590,13 @@ reset (void) { extern const unsigned long *FT0, *FT1, *FT2; + /* + * This code may not be at the start of flash ROM, because of DFU. + * So, we take the address from PC. + */ asm volatile ("cpsid i\n\t" /* Mask all interrupts. */ - "mov.w r0, #0xed00\n\t" /* r0 = SCR */ - "movt r0, #0xe000\n\t" - "mov r1, pc\n\t" /* r1 = (PC + 0x1000) & ~0x0fff */ + "ldr r0, 1f\n\t" /* r0 = SCR */ + "mov r1, pc\n\t" /* r1 = (PC + 0x1000) & ~0x0fff */ "mov r2, #0x1000\n\t" "add r1, r1, r2\n\t" "sub r2, r2, #1\n\t" @@ -589,7 +605,9 @@ reset (void) "ldr r0, [r1], #4\n\t" "msr MSP, r0\n\t" /* Main (exception handler) stack. */ "ldr r0, [r1]\n\t" /* Reset handler. */ - "bx r0\n" + "bx r0\n\t" + ".align 2\n" + "1: .word 0xe000ed00" : /* no output */ : /* no input */ : "memory"); /* Never reach here. */ |