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stm32: Add compile-time option to use HSI as clock source.

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To use HSI instead of HSE define MICROPY_HW_CLK_USE_HSI as 1 in the board
configuration file.  The default is to use HSE.

HSI has been made the default for the NUCLEO_F401RE board to serve as an
example, and because early revisions of this board need a hardware
modification to get HSE working.
This commit is contained in:
Francisco J. Manno
2019-03-03 23:50:23 +00:00
committed by Damien George
parent e61862d063
commit f938e70c69
5 changed files with 65 additions and 31 deletions
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32
ports/stm32/system_stm32.c
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@@ -111,7 +111,7 @@ void __fatal_error(const char *msg);
#if defined(STM32F4) || defined(STM32F7)
#define CONFIG_RCC_CR_1ST (RCC_CR_HSION)
#define CONFIG_RCC_CR_2ND (RCC_CR_HSEON | RCC_CR_CSSON | RCC_CR_PLLON)
#define CONFIG_RCC_CR_2ND (MICROPY_HW_RCC_CR_HSxON | RCC_CR_CSSON | RCC_CR_PLLON)
#define CONFIG_RCC_PLLCFGR (0x24003010)
#if defined(STM32F4)
@@ -222,7 +222,7 @@ void SystemInit(void)
/* Reset CFGR register */
RCC->CFGR = 0x00000000;
/* Reset HSEON, CSSON and PLLON bits */
/* Reset HSxON, CSSON and PLLON bits */
RCC->CR &= ~ CONFIG_RCC_CR_2ND;
/* Reset PLLCFGR register */
@@ -295,16 +295,17 @@ void SystemInit(void)
* @brief System Clock Configuration
*
* The system Clock is configured for F4/F7 as follows:
* System Clock source = PLL (HSE)
* (HSx should be read as HSE or HSI depending on the value of MICROPY_HW_CLK_USE_HSI)
* System Clock source = PLL (HSx)
* SYSCLK(Hz) = 168000000
* HCLK(Hz) = 168000000
* AHB Prescaler = 1
* APB1 Prescaler = 4
* APB2 Prescaler = 2
* HSE Frequency(Hz) = HSE_VALUE
* PLL_M = HSE_VALUE/1000000
* HSx Frequency(Hz) = HSx_VALUE
* PLL_M = HSx_VALUE/1000000
* PLL_N = 336
* PLL_P = 2
* PLL_P = 4
* PLL_Q = 7
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
@@ -331,16 +332,16 @@ void SystemInit(void)
* PLL is configured as follows:
*
* VCO_IN
* F4/F7 = HSE / M
* F4/F7 = HSx / M
* L4 = MSI / M
* VCO_OUT
* F4/F7 = HSE / M * N
* F4/F7 = HSx / M * N
* L4 = MSI / M * N
* PLLCLK
* F4/F7 = HSE / M * N / P
* F4/F7 = HSx / M * N / P
* L4 = MSI / M * N / R
* PLL48CK
* F4/F7 = HSE / M * N / Q
* F4/F7 = HSx / M * N / Q
* L4 = MSI / M * N / Q USB Clock is obtained over PLLSAI1
*
* SYSCLK = PLLCLK
@@ -352,6 +353,7 @@ void SystemInit(void)
* VCO_IN between 1MHz and 2MHz (2MHz recommended)
* VCO_OUT between 192MHz and 432MHz
* HSE = 8MHz
* HSI = 16MHz
* M = 2 .. 63 (inclusive)
* N = 192 ... 432 (inclusive)
* P = 2, 4, 6, 8
@@ -411,13 +413,13 @@ void SystemClock_Config(void)
/* Enable HSE Oscillator and activate PLL with HSE as source */
#if defined(STM32F4) || defined(STM32F7) || defined(STM32H7)
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = MICROPY_HW_CLK_HSE_STATE;
RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
RCC_OscInitStruct.OscillatorType = MICROPY_HW_RCC_OSCILLATOR_TYPE;
RCC_OscInitStruct.HSEState = MICROPY_HW_RCC_HSE_STATE;
RCC_OscInitStruct.HSIState = MICROPY_HW_RCC_HSI_STATE;
#if defined(STM32H7)
RCC_OscInitStruct.CSIState = RCC_CSI_OFF;
#endif
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLSource = MICROPY_HW_RCC_PLL_SRC;
#elif defined(STM32L4)
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE|RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
@@ -538,7 +540,7 @@ void SystemClock_Config(void)
}
#endif
uint32_t vco_out = RCC_OscInitStruct.PLL.PLLN * (HSE_VALUE / 1000000) / RCC_OscInitStruct.PLL.PLLM;
uint32_t vco_out = RCC_OscInitStruct.PLL.PLLN * (MICROPY_HW_CLK_VALUE / 1000000) / RCC_OscInitStruct.PLL.PLLM;
uint32_t sysclk_mhz = vco_out / RCC_OscInitStruct.PLL.PLLP;
bool need_pllsai = vco_out % 48 != 0;
if (powerctrl_rcc_clock_config_pll(&RCC_ClkInitStruct, sysclk_mhz, need_pllsai) != 0) {