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authorStephen Caudle2011-10-27 23:34:52 -0400
committerStephen Caudle2011-10-27 23:34:52 -0400
commit36cff03af1b4ad08c72ccc21bbd3903113ef423a (patch)
tree2f414e71873f8de20001b7d78e5aa41fa72026bf /lib
parent8ceeb99902786041184800248eca4d7f3741d9bf (diff)
Add RCC and FLASH support for STM32F2
Diffstat (limited to 'lib')
-rw-r--r--lib/stm32f2/Makefile2
-rw-r--r--lib/stm32f2/flash.c250
-rw-r--r--lib/stm32f2/rcc.c412
3 files changed, 663 insertions, 1 deletions
diff --git a/lib/stm32f2/Makefile b/lib/stm32f2/Makefile
index 5da64ab..98ba878 100644
--- a/lib/stm32f2/Makefile
+++ b/lib/stm32f2/Makefile
@@ -28,7 +28,7 @@ CFLAGS = -Os -g -Wall -Wextra -I../../include -fno-common \
-ffunction-sections -fdata-sections -MD -DSTM32F2
# ARFLAGS = rcsv
ARFLAGS = rcs
-OBJS = vector.o gpio.o systick.o i2c.o spi.o nvic.o usart.o
+OBJS = vector.o gpio.o systick.o i2c.o spi.o nvic.o usart.o rcc.o flash.o
#VPATH += ../usb
VPATH += ../stm32_common
diff --git a/lib/stm32f2/flash.c b/lib/stm32f2/flash.c
new file mode 100644
index 0000000..e9bc73e
--- /dev/null
+++ b/lib/stm32f2/flash.c
@@ -0,0 +1,250 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/f2/flash.h>
+
+static inline void flash_set_program_size(u32 psize)
+{
+ FLASH_CR &= ~(((1 << 0) | (1 << 1)) << 8);
+ FLASH_CR |= psize;
+}
+
+void flash_data_cache_enable(void)
+{
+ FLASH_ACR |= FLASH_DCE;
+}
+
+void flash_dcache_disable(void)
+{
+ FLASH_ACR &= ~FLASH_DCE;
+}
+
+void flash_icache_enable(void)
+{
+ FLASH_ACR |= FLASH_ICE;
+}
+
+void flash_icache_disable(void)
+{
+ FLASH_ACR &= ~FLASH_ICE;
+}
+
+void flash_prefetch_enable(void)
+{
+ FLASH_ACR |= FLASH_PRFTEN;
+}
+
+void flash_prefetch_disable(void)
+{
+ FLASH_ACR &= ~FLASH_PRFTEN;
+}
+
+void flash_dcache_reset(void)
+{
+ FLASH_ACR |= FLASH_DCRST;
+}
+
+void flash_icache_reset(void)
+{
+ FLASH_ACR |= FLASH_ICRST;
+}
+
+void flash_set_ws(u32 ws)
+{
+ u32 reg32;
+
+ reg32 = FLASH_ACR;
+ reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
+ reg32 |= ws;
+ FLASH_ACR = reg32;
+}
+
+void flash_unlock(void)
+{
+ /* Authorize the FPEC access. */
+ FLASH_KEYR = FLASH_KEY1;
+ FLASH_KEYR = FLASH_KEY2;
+}
+
+void flash_lock(void)
+{
+ FLASH_CR |= FLASH_LOCK;
+}
+
+void flash_clear_pgserr_flag(void)
+{
+ FLASH_SR |= FLASH_PGSERR;
+}
+
+void flash_clear_pgperr_flag(void)
+{
+ FLASH_SR |= FLASH_PGPERR;
+}
+
+void flash_clear_pgaerr_flag(void)
+{
+ FLASH_SR |= FLASH_PGAERR;
+}
+
+void flash_clear_eop_flag(void)
+{
+ FLASH_SR |= FLASH_EOP;
+}
+
+void flash_clear_wrperr_flag(void)
+{
+ FLASH_SR |= FLASH_WRPERR;
+}
+
+void flash_clear_bsy_flag(void)
+{
+ FLASH_SR &= ~FLASH_BSY;
+}
+
+void flash_clear_status_flags(void)
+{
+ flash_clear_pgserr_flag();
+ flash_clear_pgperr_flag();
+ flash_clear_pgaerr_flag();
+ flash_clear_eop_flag();
+ flash_clear_wrperr_flag();
+ flash_clear_bsy_flag();
+}
+
+void flash_unlock_option_bytes(void)
+{
+ FLASH_OPTKEYR = FLASH_OPTKEY1;
+ FLASH_OPTKEYR = FLASH_OPTKEY2;
+}
+
+void flash_lock_option_bytes(void)
+{
+ FLASH_OPTCR |= FLASH_OPTLOCK;
+}
+
+void flash_wait_for_last_operation(void)
+{
+ while ((FLASH_SR & FLASH_BSY) == FLASH_BSY)
+ ;
+}
+
+void flash_program_double_word(u32 address, u64 data, u32 program_size)
+{
+ /* Ensure that all flash operations are complete. */
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ /* Enable writes to flash. */
+ FLASH_CR |= FLASH_PG;
+
+ /* Program the first half of the word. */
+ MMIO64(address) = data;
+
+ /* Wait for the write to complete. */
+ flash_wait_for_last_operation();
+
+ /* Disable writes to flash. */
+ FLASH_CR &= ~FLASH_PG;
+}
+
+void flash_program_word(u32 address, u32 data, u32 program_size)
+{
+ /* Ensure that all flash operations are complete. */
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ /* Enable writes to flash. */
+ FLASH_CR |= FLASH_PG;
+
+ /* Program the first half of the word. */
+ MMIO32(address) = data;
+
+ /* Wait for the write to complete. */
+ flash_wait_for_last_operation();
+
+ /* Disable writes to flash. */
+ FLASH_CR &= ~FLASH_PG;
+}
+
+void flash_program_half_word(u32 address, u16 data, u32 program_size)
+{
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ FLASH_CR |= FLASH_PG;
+
+ MMIO16(address) = data;
+
+ flash_wait_for_last_operation();
+
+ FLASH_CR &= ~FLASH_PG; /* Disable the PG bit. */
+}
+
+void flash_program_byte(u32 address, u8 data, u32 program_size)
+{
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ FLASH_CR |= FLASH_PG;
+
+ MMIO8(address) = data;
+
+ flash_wait_for_last_operation();
+
+ FLASH_CR &= ~FLASH_PG; /* Disable the PG bit. */
+}
+
+void flash_erase_sector(u32 sector, u32 program_size)
+{
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ FLASH_CR &= ~(((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3)) << 3);
+ FLASH_CR |= sector;
+ FLASH_CR |= FLASH_STRT;
+
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_SER;
+ FLASH_CR &= ~(((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3)) << 3);
+}
+
+void flash_erase_all_sectors(u32 program_size)
+{
+ flash_wait_for_last_operation();
+ flash_set_program_size(program_size);
+
+ FLASH_CR |= FLASH_MER; /* Enable mass erase. */
+ FLASH_CR |= FLASH_STRT; /* Trigger the erase. */
+
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_MER; /* Disable mass erase. */
+}
+
+void flash_program_option_bytes(u32 data)
+{
+ flash_wait_for_last_operation();
+
+ if (FLASH_OPTCR & FLASH_OPTLOCK)
+ flash_unlock_option_bytes();
+
+ FLASH_OPTCR = data & ~0x3;
+ FLASH_OPTCR |= FLASH_OPTSTRT; /* Enable option byte programming. */
+ flash_wait_for_last_operation();
+}
diff --git a/lib/stm32f2/rcc.c b/lib/stm32f2/rcc.c
new file mode 100644
index 0000000..048f0ff
--- /dev/null
+++ b/lib/stm32f2/rcc.c
@@ -0,0 +1,412 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Federico Ruiz-Ugalde <memeruiz at gmail dot com>
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/f2/rcc.h>
+#include <libopencm3/stm32/f2/flash.h>
+
+/* Set the default ppre1 and ppre2 peripheral clock frequencies after reset */
+u32 rcc_ppre1_frequency = 8000000;
+u32 rcc_ppre2_frequency = 8000000;
+
+/* TODO: Create a table for these values */
+#define RCC_PLL_M 8
+#define RCC_PLL_N 336
+#define RCC_PLL_P 2
+#define RCC_PLL_Q 7
+#define RCC_PLLI2S_N 192
+#define RCC_PLLI2S_R 5
+
+void rcc_osc_ready_int_clear(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ RCC_CIR |= RCC_CIR_PLLRDYC;
+ break;
+ case HSE:
+ RCC_CIR |= RCC_CIR_HSERDYC;
+ break;
+ case HSI:
+ RCC_CIR |= RCC_CIR_HSIRDYC;
+ break;
+ case LSE:
+ RCC_CIR |= RCC_CIR_LSERDYC;
+ break;
+ case LSI:
+ RCC_CIR |= RCC_CIR_LSIRDYC;
+ break;
+ }
+}
+
+void rcc_osc_ready_int_enable(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ RCC_CIR |= RCC_CIR_PLLRDYIE;
+ break;
+ case HSE:
+ RCC_CIR |= RCC_CIR_HSERDYIE;
+ break;
+ case HSI:
+ RCC_CIR |= RCC_CIR_HSIRDYIE;
+ break;
+ case LSE:
+ RCC_CIR |= RCC_CIR_LSERDYIE;
+ break;
+ case LSI:
+ RCC_CIR |= RCC_CIR_LSIRDYIE;
+ break;
+ }
+}
+
+void rcc_osc_ready_int_disable(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ RCC_CIR &= ~RCC_CIR_PLLRDYIE;
+ break;
+ case HSE:
+ RCC_CIR &= ~RCC_CIR_HSERDYIE;
+ break;
+ case HSI:
+ RCC_CIR &= ~RCC_CIR_HSIRDYIE;
+ break;
+ case LSE:
+ RCC_CIR &= ~RCC_CIR_LSERDYIE;
+ break;
+ case LSI:
+ RCC_CIR &= ~RCC_CIR_LSIRDYIE;
+ break;
+ }
+}
+
+int rcc_osc_ready_int_flag(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ return ((RCC_CIR & RCC_CIR_PLLRDYF) != 0);
+ break;
+ case HSE:
+ return ((RCC_CIR & RCC_CIR_HSERDYF) != 0);
+ break;
+ case HSI:
+ return ((RCC_CIR & RCC_CIR_HSIRDYF) != 0);
+ break;
+ case LSE:
+ return ((RCC_CIR & RCC_CIR_LSERDYF) != 0);
+ break;
+ case LSI:
+ return ((RCC_CIR & RCC_CIR_LSIRDYF) != 0);
+ break;
+ }
+
+ /* Shouldn't be reached. */
+ return -1;
+}
+
+void rcc_css_int_clear(void)
+{
+ RCC_CIR |= RCC_CIR_CSSC;
+}
+
+int rcc_css_int_flag(void)
+{
+ return ((RCC_CIR & RCC_CIR_CSSF) != 0);
+}
+
+void rcc_wait_for_osc_ready(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ while ((RCC_CR & RCC_CR_PLLRDY) == 0);
+ break;
+ case HSE:
+ while ((RCC_CR & RCC_CR_HSERDY) == 0);
+ break;
+ case HSI:
+ while ((RCC_CR & RCC_CR_HSIRDY) == 0);
+ break;
+ case LSE:
+ while ((RCC_BDCR & RCC_BDCR_LSERDY) == 0);
+ break;
+ case LSI:
+ while ((RCC_CSR & RCC_CSR_LSIRDY) == 0);
+ break;
+ }
+}
+
+void rcc_wait_for_sysclk_status(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_PLL);
+ break;
+ case HSE:
+ while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_HSE);
+ break;
+ case HSI:
+ while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_HSI);
+ break;
+ default:
+ /* Shouldn't be reached. */
+ break;
+ }
+}
+
+void rcc_osc_on(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ RCC_CR |= RCC_CR_PLLON;
+ break;
+ case HSE:
+ RCC_CR |= RCC_CR_HSEON;
+ break;
+ case HSI:
+ RCC_CR |= RCC_CR_HSION;
+ break;
+ case LSE:
+ RCC_BDCR |= RCC_BDCR_LSEON;
+ break;
+ case LSI:
+ RCC_CSR |= RCC_CSR_LSION;
+ break;
+ }
+}
+
+void rcc_osc_off(osc_t osc)
+{
+ switch (osc) {
+ case PLL:
+ RCC_CR &= ~RCC_CR_PLLON;
+ break;
+ case HSE:
+ RCC_CR &= ~RCC_CR_HSEON;
+ break;
+ case HSI:
+ RCC_CR &= ~RCC_CR_HSION;
+ break;
+ case LSE:
+ RCC_BDCR &= ~RCC_BDCR_LSEON;
+ break;
+ case LSI:
+ RCC_CSR &= ~RCC_CSR_LSION;
+ break;
+ }
+}
+
+void rcc_css_enable(void)
+{
+ RCC_CR |= RCC_CR_CSSON;
+}
+
+void rcc_css_disable(void)
+{
+ RCC_CR &= ~RCC_CR_CSSON;
+}
+
+void rcc_osc_bypass_enable(osc_t osc)
+{
+ switch (osc) {
+ case HSE:
+ RCC_CR |= RCC_CR_HSEBYP;
+ break;
+ case LSE:
+ RCC_BDCR |= RCC_BDCR_LSEBYP;
+ break;
+ case PLL:
+ case HSI:
+ case LSI:
+ /* Do nothing, only HSE/LSE allowed here. */
+ break;
+ }
+}
+
+void rcc_osc_bypass_disable(osc_t osc)
+{
+ switch (osc) {
+ case HSE:
+ RCC_CR &= ~RCC_CR_HSEBYP;
+ break;
+ case LSE:
+ RCC_BDCR &= ~RCC_BDCR_LSEBYP;
+ break;
+ case PLL:
+ case HSI:
+ case LSI:
+ /* Do nothing, only HSE/LSE allowed here. */
+ break;
+ }
+}
+
+void rcc_peripheral_enable_clock(volatile u32 *reg, u32 en)
+{
+ *reg |= en;
+}
+
+void rcc_peripheral_disable_clock(volatile u32 *reg, u32 en)
+{
+ *reg &= ~en;
+}
+
+void rcc_peripheral_reset(volatile u32 *reg, u32 reset)
+{
+ *reg |= reset;
+}
+
+void rcc_peripheral_clear_reset(volatile u32 *reg, u32 clear_reset)
+{
+ *reg &= ~clear_reset;
+}
+
+void rcc_set_sysclk_source(u32 clk)
+{
+ u32 reg32;
+
+ reg32 = RCC_CFGR;
+ reg32 &= ~((1 << 1) | (1 << 0));
+ RCC_CFGR = (reg32 | clk);
+}
+
+void rcc_set_pll_source(u32 pllsrc)
+{
+ u32 reg32;
+
+ reg32 = RCC_PLLCFGR;
+ reg32 &= ~(1 << 22);
+ RCC_PLLCFGR = (reg32 | (pllsrc << 22));
+}
+
+void rcc_set_ppre2(u32 ppre2)
+{
+ u32 reg32;
+
+ reg32 = RCC_CFGR;
+ reg32 &= ~((1 << 11) | (1 << 12) | (1 << 13));
+ RCC_CFGR = (reg32 | (ppre2 << 11));
+}
+
+void rcc_set_ppre1(u32 ppre1)
+{
+ u32 reg32;
+
+ reg32 = RCC_CFGR;
+ reg32 &= ~((1 << 8) | (1 << 9) | (1 << 10));
+ RCC_CFGR = (reg32 | (ppre1 << 8));
+}
+
+void rcc_set_hpre(u32 hpre)
+{
+ u32 reg32;
+
+ reg32 = RCC_CFGR;
+ reg32 &= ~((1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
+ RCC_CFGR = (reg32 | (hpre << 4));
+}
+
+void rcc_set_rtcpre(u32 rtcpre)
+{
+ u32 reg32;
+
+ reg32 = RCC_CFGR;
+ reg32 &= ~((1 << 16) | (1 << 17) | (1 << 18) | (1 << 19) | (1 << 20));
+ RCC_CFGR = (reg32 | (rtcpre << 16));
+}
+
+void rcc_set_main_pll_hsi(u32 pllm, u32 plln, u32 pllp, u32 pllq)
+{
+ RCC_PLLCFGR = pllm |
+ (plln << 6) |
+ (((pllp >> 1) - 1) << 16) |
+ (pllq << 24);
+}
+
+void rcc_set_main_pll_hse(u32 pllm, u32 plln, u32 pllp, u32 pllq)
+{
+ RCC_PLLCFGR = pllm |
+ (plln << 6) |
+ (((pllp >> 1) - 1) << 16) |
+ RCC_PLLCFGR_PLLSRC |
+ (pllq << 24);
+}
+
+u32 rcc_system_clock_source(void)
+{
+ /* Return the clock source which is used as system clock. */
+ return ((RCC_CFGR & 0x000c) >> 2);
+}
+
+void rcc_clock_setup_in_hse_8mhz_out_120mhz(void)
+{
+ /* Enable internal high-speed oscillator. */
+ rcc_osc_on(HSI);
+ rcc_wait_for_osc_ready(HSI);
+
+ /* Select HSI as SYSCLK source. */
+ rcc_set_sysclk_source(RCC_CFGR_SW_HSI);
+
+ /* Enable external high-speed oscillator 8MHz. */
+ rcc_osc_on(HSE);
+ rcc_wait_for_osc_ready(HSE);
+ rcc_set_sysclk_source(RCC_CFGR_SW_HSE);
+
+ /*
+ * Set prescalers for AHB, ADC, ABP1, ABP2.
+ * Do this before touching the PLL (TODO: why?).
+ */
+ rcc_set_hpre(RCC_CFGR_HPRE_DIV_NONE); /* Set. 120MHz Max. 120MHz */
+ rcc_set_ppre1(RCC_CFGR_PPRE_DIV_4); /* Set. 30MHz Max. 30MHz */
+ rcc_set_ppre2(RCC_CFGR_PPRE_DIV_2); /* Set. 60MHz Max. 60MHz */
+
+ rcc_set_main_pll_hse(RCC_PLL_M, RCC_PLL_N, RCC_PLL_P, RCC_PLL_Q);
+
+ /* Enable PLL oscillator and wait for it to stabilize. */
+ rcc_osc_on(PLL);
+ rcc_wait_for_osc_ready(PLL);
+
+ /*
+ * @3.3V
+ * Sysclk runs with 120MHz -> 3 waitstates.
+ * 0WS from 0-30MHz
+ * 1WS from 30-60MHz
+ * 2WS from 60-90MHz
+ * 3WS from 90-120MHz
+ */
+ flash_set_ws(FLASH_PRFTEN | FLASH_ICE | FLASH_DCE | FLASH_LATENCY_3WS);
+
+ /* Select PLL as SYSCLK source. */
+ rcc_set_sysclk_source(RCC_CFGR_SW_PLL);
+
+ /* Wait for PLL clock to be selected. */
+ rcc_wait_for_sysclk_status(PLL);
+
+ /* Set the peripheral clock frequencies used */
+ rcc_ppre1_frequency = 30000000;
+ rcc_ppre2_frequency = 60000000;
+}
+
+void rcc_backupdomain_reset(void)
+{
+ /* Set the backup domain software reset. */
+ RCC_BDCR |= RCC_BDCR_BDRST;
+
+ /* Clear the backup domain software reset. */
+ RCC_BDCR &= ~RCC_BDCR_BDRST;
+}