Fixed with HAL.
Fork of ST_L152_32MHZ by
Not finish yet. External crystal doesn't work.
Revision 0:84e23a19e37d, committed 2014-03-11
- Comitter:
- dreschpe
- Date:
- Tue Mar 11 20:34:57 2014 +0000
- Child:
- 1:bdeac50afe1a
- Commit message:
- Lib for the ST Nucleo L152RE board to switch the clock to 32MHz.; Out of the box the board is running on 16MHz.
Changed in this revision
ST_L152_32MHZ.cpp | Show annotated file Show diff for this revision Revisions of this file |
ST_L152_32MHZ.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ST_L152_32MHZ.cpp Tue Mar 11 20:34:57 2014 +0000 @@ -0,0 +1,46 @@ + + +#include "stm32l1xx.h" +#include "stm32l1xx_flash.h" +#include "stm32l1xx_rcc.h" +#include "ST_L152_32MHZ.h" + +// set cpu clock to 32MHz + + + +L152_init32::L152_init32(unsigned int external){ + clk_err = setup_clock_32MHZ(external); + } + +#define PLL_STARTUP_TIMEOUT 0x5000 + +int L152_init32::setup_clock_32MHZ(int external) +{ + uint32_t PLLStartUpCounter = 0,PLLStatus = 0,error; + + if(external == 0) { // internal Oscillator + RCC_PLLConfig(RCC_PLLSource_HSI,RCC_PLLMul_6,RCC_PLLDiv_3); // setup pll to 96MHz to use USB + } else { + RCC_HSEConfig(RCC_HSE_ON); // start external crystal osc. + error = RCC_WaitForHSEStartUp(); + if(error == ERROR ) { // no external crystal + return(0); + } + RCC_PLLConfig(RCC_PLLSource_HSE,RCC_PLLMul_12,RCC_PLLDiv_3); // setup pll to 96MHz to use USB + } + RCC_PLLCmd(ENABLE); // switch on pll + do { + PLLStatus = RCC->CR & RCC_CR_PLLRDY; + } while((PLLStatus == 0) && (PLLStartUpCounter < PLL_STARTUP_TIMEOUT)); // wait for pll + if(PLLStatus == 0) { + return(0); + } + FLASH_SetLatency(FLASH_Latency_1); + FLASH_PrefetchBufferCmd(ENABLE); + FLASH_ReadAccess64Cmd(ENABLE); + RCC_HCLKConfig(RCC_SYSCLK_Div2); + RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); // switch to 32 MHz clock + SystemCoreClockUpdate(); // update SystemCoreClock var + return(1); +} \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ST_L152_32MHZ.h Tue Mar 11 20:34:57 2014 +0000 @@ -0,0 +1,49 @@ +/* mbed library for the ST NUCLEO board L152RE + * to change the CPU clock to 32 MHz + * A pll clock of 96 MHz is used to enable USB + * + * Copyright (c) 2014 Peter Drescher - DC2PD + * Released under the MIT License: http://mbed.org/license/mit + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +#ifndef MBED_ST_L152_32MHZ_H +#define MBED_ST_L152_32MHZ_H + +/** Setup cpu speed to 32 MHz + * + * @code + * #include "mbed.h" + * #include "ST_L152_32MHZ.h" + * + * // place the init before other code to ensure right timing of other objects ! + * L152_init32 myinit(0); // use the internal oscillator + * + */ + +class L152_init32 +{ +public: + /** Create a L152_init32 object to change the clock + * @param external = 0 use internal oscillator + * @param external = 1 use external 8 MHz crystal - you have to add some comonents to the pcb ! +*/ +L152_init32(unsigned int external); +int clk_err; + +protected: +// do the magic ;-) +int setup_clock_32MHZ(int external); +}; + +#endif + +