diff --git a/targets/TARGET_STM/TARGET_STM32H7/i2c_device.c b/targets/TARGET_STM/TARGET_STM32H7/i2c_device.c index d2aea61d29..b1a9e8b182 100644 --- a/targets/TARGET_STM/TARGET_STM32H7/i2c_device.c +++ b/targets/TARGET_STM/TARGET_STM32H7/i2c_device.c @@ -14,18 +14,18 @@ ****************************************************************************** */ - #include "i2c_device.h" - #include "mbed_assert.h" - #include "mbed_error.h" - #include "stm32h7xx_ll_rcc.h" +#include "i2c_device.h" +#include "mbed_assert.h" +#include "mbed_error.h" +#include "stm32h7xx_ll_rcc.h" - #if DEVICE_I2C +#if DEVICE_I2C - /** @defgroup I2C_DEVICE_Private_Constants I2C_DEVICE Private Constants - * @{ - */ +/** @defgroup I2C_DEVICE_Private_Constants I2C_DEVICE Private Constants + * @{ + */ #ifndef I2C_VALID_TIMING_NBR - #define I2C_VALID_TIMING_NBR 128U +#define I2C_VALID_TIMING_NBR 128U #endif #define I2C_SPEED_FREQ_STANDARD 0U /* 100 kHz */ #define I2C_SPEED_FREQ_FAST 1U /* 400 kHz */ @@ -47,28 +47,26 @@ /** @defgroup I2C_DEVICE_Private_Types I2C_DEVICE Private Types * @{ */ -typedef struct -{ - uint32_t freq; /* Frequency in Hz */ - uint32_t freq_min; /* Minimum frequency in Hz */ - uint32_t freq_max; /* Maximum frequency in Hz */ - uint32_t hddat_min; /* Minimum data hold time in ns */ - uint32_t vddat_max; /* Maximum data valid time in ns */ - uint32_t sudat_min; /* Minimum data setup time in ns */ - uint32_t lscl_min; /* Minimum low period of the SCL clock in ns */ - uint32_t hscl_min; /* Minimum high period of SCL clock in ns */ - uint32_t trise; /* Rise time in ns */ - uint32_t tfall; /* Fall time in ns */ - uint32_t dnf; /* Digital noise filter coefficient */ +typedef struct { + uint32_t freq; /* Frequency in Hz */ + uint32_t freq_min; /* Minimum frequency in Hz */ + uint32_t freq_max; /* Maximum frequency in Hz */ + uint32_t hddat_min; /* Minimum data hold time in ns */ + uint32_t vddat_max; /* Maximum data valid time in ns */ + uint32_t sudat_min; /* Minimum data setup time in ns */ + uint32_t lscl_min; /* Minimum low period of the SCL clock in ns */ + uint32_t hscl_min; /* Minimum high period of SCL clock in ns */ + uint32_t trise; /* Rise time in ns */ + uint32_t tfall; /* Fall time in ns */ + uint32_t dnf; /* Digital noise filter coefficient */ } I2C_Charac_t; -typedef struct -{ - uint32_t presc; /* Timing prescaler */ - uint32_t tscldel; /* SCL delay */ - uint32_t tsdadel; /* SDA delay */ - uint32_t sclh; /* SCL high period */ - uint32_t scll; /* SCL low period */ +typedef struct { + uint32_t presc; /* Timing prescaler */ + uint32_t tscldel; /* SCL delay */ + uint32_t tsdadel; /* SDA delay */ + uint32_t sclh; /* SCL high period */ + uint32_t scll; /* SCL low period */ } I2C_Timings_t; /** * @} @@ -77,50 +75,49 @@ typedef struct /** @defgroup I2C_DEVICE_Private_Constants I2C_DEVICE Private Constants * @{ */ -static const I2C_Charac_t I2C_Charac[] = -{ - [I2C_SPEED_FREQ_STANDARD] = - { - .freq = 100000, - .freq_min = 80000, - .freq_max = 120000, - .hddat_min = 0, - .vddat_max = 3450, - .sudat_min = 250, - .lscl_min = 4700, - .hscl_min = 4000, - .trise = 640, - .tfall = 20, - .dnf = I2C_DIGITAL_FILTER_COEF, - }, - [I2C_SPEED_FREQ_FAST] = - { - .freq = 400000, - .freq_min = 320000, - .freq_max = 480000, - .hddat_min = 0, - .vddat_max = 900, - .sudat_min = 100, - .lscl_min = 1300, - .hscl_min = 600, - .trise = 250, - .tfall = 100, - .dnf = I2C_DIGITAL_FILTER_COEF, - }, - [I2C_SPEED_FREQ_FAST_PLUS] = - { - .freq = 1000000, - .freq_min = 800000, - .freq_max = 1200000, - .hddat_min = 0, - .vddat_max = 450, - .sudat_min = 50, - .lscl_min = 500, - .hscl_min = 260, - .trise = 60, - .tfall = 100, - .dnf = I2C_DIGITAL_FILTER_COEF, - }, +static const I2C_Charac_t I2C_Charac[] = { + [I2C_SPEED_FREQ_STANDARD] = + { + .freq = 100000, + .freq_min = 80000, + .freq_max = 120000, + .hddat_min = 0, + .vddat_max = 3450, + .sudat_min = 250, + .lscl_min = 4700, + .hscl_min = 4000, + .trise = 640, + .tfall = 20, + .dnf = I2C_DIGITAL_FILTER_COEF, + }, + [I2C_SPEED_FREQ_FAST] = + { + .freq = 400000, + .freq_min = 320000, + .freq_max = 480000, + .hddat_min = 0, + .vddat_max = 900, + .sudat_min = 100, + .lscl_min = 1300, + .hscl_min = 600, + .trise = 250, + .tfall = 100, + .dnf = I2C_DIGITAL_FILTER_COEF, + }, + [I2C_SPEED_FREQ_FAST_PLUS] = + { + .freq = 1000000, + .freq_min = 800000, + .freq_max = 1200000, + .hddat_min = 0, + .vddat_max = 450, + .sudat_min = 50, + .lscl_min = 500, + .hscl_min = 260, + .trise = 60, + .tfall = 100, + .dnf = I2C_DIGITAL_FILTER_COEF, + }, }; /** * @} @@ -146,77 +143,68 @@ static uint32_t I2c_valid_timing_nbr = 0; */ static void I2C_Compute_PRESC_SCLDEL_SDADEL(uint32_t clock_src_freq, uint32_t I2C_speed) { - uint32_t prev_presc = I2C_PRESC_MAX; - uint32_t ti2cclk; - int32_t tsdadel_min, tsdadel_max; - int32_t tscldel_min; - uint32_t presc, scldel, sdadel; - uint32_t tafdel_min, tafdel_max; + uint32_t prev_presc = I2C_PRESC_MAX; + uint32_t ti2cclk; + int32_t tsdadel_min, tsdadel_max; + int32_t tscldel_min; + uint32_t presc, scldel, sdadel; + uint32_t tafdel_min, tafdel_max; - ti2cclk = (SEC2NSEC + (clock_src_freq / 2U))/ clock_src_freq; + ti2cclk = (SEC2NSEC + (clock_src_freq / 2U)) / clock_src_freq; - tafdel_min = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MIN : 0U; - tafdel_max = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MAX : 0U; + tafdel_min = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MIN : 0U; + tafdel_max = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MAX : 0U; - /* tDNF = DNF x tI2CCLK - tPRESC = (PRESC+1) x tI2CCLK - SDADEL >= {tf +tHD;DAT(min) - tAF(min) - tDNF - [3 x tI2CCLK]} / {tPRESC} - SDADEL <= {tVD;DAT(max) - tr - tAF(max) - tDNF- [4 x tI2CCLK]} / {tPRESC} */ + /* tDNF = DNF x tI2CCLK + tPRESC = (PRESC+1) x tI2CCLK + SDADEL >= {tf +tHD;DAT(min) - tAF(min) - tDNF - [3 x tI2CCLK]} / {tPRESC} + SDADEL <= {tVD;DAT(max) - tr - tAF(max) - tDNF- [4 x tI2CCLK]} / {tPRESC} */ - tsdadel_min = (int32_t)I2C_Charac[I2C_speed].tfall + (int32_t)I2C_Charac[I2C_speed].hddat_min - - (int32_t)tafdel_min - (int32_t)(((int32_t)I2C_Charac[I2C_speed].dnf + 3) * (int32_t)ti2cclk); + tsdadel_min = (int32_t)I2C_Charac[I2C_speed].tfall + (int32_t)I2C_Charac[I2C_speed].hddat_min - + (int32_t)tafdel_min - (int32_t)(((int32_t)I2C_Charac[I2C_speed].dnf + 3) * (int32_t)ti2cclk); - tsdadel_max = (int32_t)I2C_Charac[I2C_speed].vddat_max - (int32_t)I2C_Charac[I2C_speed].trise - - (int32_t)tafdel_max - (int32_t)(((int32_t)I2C_Charac[I2C_speed].dnf + 4) * (int32_t)ti2cclk); + tsdadel_max = (int32_t)I2C_Charac[I2C_speed].vddat_max - (int32_t)I2C_Charac[I2C_speed].trise - + (int32_t)tafdel_max - (int32_t)(((int32_t)I2C_Charac[I2C_speed].dnf + 4) * (int32_t)ti2cclk); - /* {[tr+ tSU;DAT(min)] / [tPRESC]} - 1 <= SCLDEL */ - tscldel_min = (int32_t)I2C_Charac[I2C_speed].trise + (int32_t)I2C_Charac[I2C_speed].sudat_min; + /* {[tr+ tSU;DAT(min)] / [tPRESC]} - 1 <= SCLDEL */ + tscldel_min = (int32_t)I2C_Charac[I2C_speed].trise + (int32_t)I2C_Charac[I2C_speed].sudat_min; - if (tsdadel_min <= 0) - { - tsdadel_min = 0; - } - - if (tsdadel_max <= 0) - { - tsdadel_max = 0; - } - - for (presc = 0; presc < I2C_PRESC_MAX; presc++) - { - for (scldel = 0; scldel < I2C_SCLDEL_MAX; scldel++) - { - /* TSCLDEL = (SCLDEL+1) * (PRESC+1) * TI2CCLK */ - uint32_t tscldel = (scldel + 1U) * (presc + 1U) * ti2cclk; - - if (tscldel >= (uint32_t)tscldel_min) - { - for (sdadel = 0; sdadel < I2C_SDADEL_MAX; sdadel++) - { - /* TSDADEL = SDADEL * (PRESC+1) * TI2CCLK */ - uint32_t tsdadel = (sdadel * (presc + 1U)) * ti2cclk; - - if ((tsdadel >= (uint32_t)tsdadel_min) && (tsdadel <= (uint32_t)tsdadel_max)) - { - if(presc != prev_presc) - { - I2c_valid_timing[I2c_valid_timing_nbr].presc = presc; - I2c_valid_timing[I2c_valid_timing_nbr].tscldel = scldel; - I2c_valid_timing[I2c_valid_timing_nbr].tsdadel = sdadel; - prev_presc = presc; - I2c_valid_timing_nbr ++; - - if(I2c_valid_timing_nbr >= I2C_VALID_TIMING_NBR) - { - return; - } - } - } - } - } + if (tsdadel_min <= 0) { + tsdadel_min = 0; + } + + if (tsdadel_max <= 0) { + tsdadel_max = 0; + } + + for (presc = 0; presc < I2C_PRESC_MAX; presc++) { + for (scldel = 0; scldel < I2C_SCLDEL_MAX; scldel++) { + /* TSCLDEL = (SCLDEL+1) * (PRESC+1) * TI2CCLK */ + uint32_t tscldel = (scldel + 1U) * (presc + 1U) * ti2cclk; + + if (tscldel >= (uint32_t)tscldel_min) { + for (sdadel = 0; sdadel < I2C_SDADEL_MAX; sdadel++) { + /* TSDADEL = SDADEL * (PRESC+1) * TI2CCLK */ + uint32_t tsdadel = (sdadel * (presc + 1U)) * ti2cclk; + + if ((tsdadel >= (uint32_t)tsdadel_min) && (tsdadel <= (uint32_t)tsdadel_max)) { + if (presc != prev_presc) { + I2c_valid_timing[I2c_valid_timing_nbr].presc = presc; + I2c_valid_timing[I2c_valid_timing_nbr].tscldel = scldel; + I2c_valid_timing[I2c_valid_timing_nbr].tsdadel = sdadel; + prev_presc = presc; + I2c_valid_timing_nbr ++; + + if (I2c_valid_timing_nbr >= I2C_VALID_TIMING_NBR) { + return; + } + } + } + } + } + } } - } } /** @@ -225,77 +213,70 @@ static void I2C_Compute_PRESC_SCLDEL_SDADEL(uint32_t clock_src_freq, uint32_t I2 * @param I2C_speed I2C frequency (index). * @retval config index (0 to I2C_VALID_TIMING_NBR], 0xFFFFFFFF for no valid config. */ -static uint32_t I2C_Compute_SCLL_SCLH (uint32_t clock_src_freq, uint32_t I2C_speed) +static uint32_t I2C_Compute_SCLL_SCLH(uint32_t clock_src_freq, uint32_t I2C_speed) { - uint32_t ret = 0xFFFFFFFFU; - uint32_t ti2cclk; - uint32_t ti2cspeed; - uint32_t prev_error; - uint32_t dnf_delay; - uint32_t clk_min, clk_max; - uint32_t scll, sclh; - uint32_t tafdel_min; + uint32_t ret = 0xFFFFFFFFU; + uint32_t ti2cclk; + uint32_t ti2cspeed; + uint32_t prev_error; + uint32_t dnf_delay; + uint32_t clk_min, clk_max; + uint32_t scll, sclh; + uint32_t tafdel_min; - ti2cclk = (SEC2NSEC + (clock_src_freq / 2U))/ clock_src_freq; - ti2cspeed = (SEC2NSEC + (I2C_Charac[I2C_speed].freq / 2U))/ I2C_Charac[I2C_speed].freq; + ti2cclk = (SEC2NSEC + (clock_src_freq / 2U)) / clock_src_freq; + ti2cspeed = (SEC2NSEC + (I2C_Charac[I2C_speed].freq / 2U)) / I2C_Charac[I2C_speed].freq; - tafdel_min = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MIN : 0U; + tafdel_min = (I2C_USE_ANALOG_FILTER == 1U) ? I2C_ANALOG_FILTER_DELAY_MIN : 0U; - /* tDNF = DNF x tI2CCLK */ - dnf_delay = I2C_Charac[I2C_speed].dnf * ti2cclk; + /* tDNF = DNF x tI2CCLK */ + dnf_delay = I2C_Charac[I2C_speed].dnf * ti2cclk; - clk_max = SEC2NSEC / I2C_Charac[I2C_speed].freq_min; - clk_min = SEC2NSEC / I2C_Charac[I2C_speed].freq_max; + clk_max = SEC2NSEC / I2C_Charac[I2C_speed].freq_min; + clk_min = SEC2NSEC / I2C_Charac[I2C_speed].freq_max; - prev_error = ti2cspeed; + prev_error = ti2cspeed; - for (uint32_t count = 0; count < I2c_valid_timing_nbr; count++) - { - /* tPRESC = (PRESC+1) x tI2CCLK*/ - uint32_t tpresc = (I2c_valid_timing[count].presc + 1U) * ti2cclk; + for (uint32_t count = 0; count < I2c_valid_timing_nbr; count++) { + /* tPRESC = (PRESC+1) x tI2CCLK*/ + uint32_t tpresc = (I2c_valid_timing[count].presc + 1U) * ti2cclk; - for (scll = 0; scll < I2C_SCLL_MAX; scll++) - { - /* tLOW(min) <= tAF(min) + tDNF + 2 x tI2CCLK + [(SCLL+1) x tPRESC ] */ - uint32_t tscl_l = tafdel_min + dnf_delay + (2U * ti2cclk) + ((scll + 1U) * tpresc); + for (scll = 0; scll < I2C_SCLL_MAX; scll++) { + /* tLOW(min) <= tAF(min) + tDNF + 2 x tI2CCLK + [(SCLL+1) x tPRESC ] */ + uint32_t tscl_l = tafdel_min + dnf_delay + (2U * ti2cclk) + ((scll + 1U) * tpresc); - /* The I2CCLK period tI2CCLK must respect the following conditions: - tI2CCLK < (tLOW - tfilters) / 4 and tI2CCLK < tHIGH */ - if ((tscl_l > I2C_Charac[I2C_speed].lscl_min) && (ti2cclk < ((tscl_l - tafdel_min - dnf_delay) / 4U))) - { - for (sclh = 0; sclh < I2C_SCLH_MAX; sclh++) - { - /* tHIGH(min) <= tAF(min) + tDNF + 2 x tI2CCLK + [(SCLH+1) x tPRESC] */ - uint32_t tscl_h = tafdel_min + dnf_delay + (2U * ti2cclk) + ((sclh + 1U) * tpresc); + /* The I2CCLK period tI2CCLK must respect the following conditions: + tI2CCLK < (tLOW - tfilters) / 4 and tI2CCLK < tHIGH */ + if ((tscl_l > I2C_Charac[I2C_speed].lscl_min) && (ti2cclk < ((tscl_l - tafdel_min - dnf_delay) / 4U))) { + for (sclh = 0; sclh < I2C_SCLH_MAX; sclh++) { + /* tHIGH(min) <= tAF(min) + tDNF + 2 x tI2CCLK + [(SCLH+1) x tPRESC] */ + uint32_t tscl_h = tafdel_min + dnf_delay + (2U * ti2cclk) + ((sclh + 1U) * tpresc); - /* tSCL = tf + tLOW + tr + tHIGH */ - uint32_t tscl = tscl_l + tscl_h + I2C_Charac[I2C_speed].trise + I2C_Charac[I2C_speed].tfall; + /* tSCL = tf + tLOW + tr + tHIGH */ + uint32_t tscl = tscl_l + tscl_h + I2C_Charac[I2C_speed].trise + I2C_Charac[I2C_speed].tfall; - if ((tscl >= clk_min) && (tscl <= clk_max) && (tscl_h >= I2C_Charac[I2C_speed].hscl_min) && (ti2cclk < tscl_h)) - { - int32_t error = (int32_t)tscl - (int32_t)ti2cspeed; + if ((tscl >= clk_min) && (tscl <= clk_max) && (tscl_h >= I2C_Charac[I2C_speed].hscl_min) && (ti2cclk < tscl_h)) { + int32_t error = (int32_t)tscl - (int32_t)ti2cspeed; - if (error < 0) - { - error = -error; + if (error < 0) { + error = -error; + } + + /* look for the timings with the lowest clock error */ + if ((uint32_t)error < prev_error) { + prev_error = (uint32_t)error; + I2c_valid_timing[count].scll = scll; + I2c_valid_timing[count].sclh = sclh; + ret = count; + } + } + } } - - /* look for the timings with the lowest clock error */ - if ((uint32_t)error < prev_error) - { - prev_error = (uint32_t)error; - I2c_valid_timing[count].scll = scll; - I2c_valid_timing[count].sclh = sclh; - ret = count; - } - } } - } } - } - return ret; + return ret; } /** @@ -306,35 +287,31 @@ static uint32_t I2C_Compute_SCLL_SCLH (uint32_t clock_src_freq, uint32_t I2C_spe */ static uint32_t I2C_ComputeTiming(uint32_t clock_src_freq, uint32_t i2c_freq) { - uint32_t ret = 0; - uint32_t speed; - uint32_t idx; + uint32_t ret = 0; + uint32_t speed; + uint32_t idx; - if((clock_src_freq != 0U) && (i2c_freq != 0U)) - { - for ( speed = 0 ; speed <= (uint32_t)I2C_SPEED_FREQ_FAST_PLUS ; speed++) - { - if ((i2c_freq >= I2C_Charac[speed].freq_min) && - (i2c_freq <= I2C_Charac[speed].freq_max)) - { - I2C_Compute_PRESC_SCLDEL_SDADEL(clock_src_freq, speed); - idx = I2C_Compute_SCLL_SCLH(clock_src_freq, speed); + if ((clock_src_freq != 0U) && (i2c_freq != 0U)) { + for (speed = 0 ; speed <= (uint32_t)I2C_SPEED_FREQ_FAST_PLUS ; speed++) { + if ((i2c_freq >= I2C_Charac[speed].freq_min) && + (i2c_freq <= I2C_Charac[speed].freq_max)) { + I2C_Compute_PRESC_SCLDEL_SDADEL(clock_src_freq, speed); + idx = I2C_Compute_SCLL_SCLH(clock_src_freq, speed); - if (idx < I2C_VALID_TIMING_NBR) - { - ret = ((I2c_valid_timing[idx].presc & 0x0FU) << 28) |\ - ((I2c_valid_timing[idx].tscldel & 0x0FU) << 20) |\ - ((I2c_valid_timing[idx].tsdadel & 0x0FU) << 16) |\ - ((I2c_valid_timing[idx].sclh & 0xFFU) << 8) |\ - ((I2c_valid_timing[idx].scll & 0xFFU) << 0); + if (idx < I2C_VALID_TIMING_NBR) { + ret = ((I2c_valid_timing[idx].presc & 0x0FU) << 28) | \ + ((I2c_valid_timing[idx].tscldel & 0x0FU) << 20) | \ + ((I2c_valid_timing[idx].tsdadel & 0x0FU) << 16) | \ + ((I2c_valid_timing[idx].sclh & 0xFFU) << 8) | \ + ((I2c_valid_timing[idx].scll & 0xFFU) << 0); + } + break; + } } - break; - } } - } - return ret; + return ret; } /** @@ -344,62 +321,58 @@ static uint32_t I2C_ComputeTiming(uint32_t clock_src_freq, uint32_t i2c_freq) */ static uint32_t I2C_GetPclk(I2CName i2c) { - uint32_t clocksource; - uint32_t pclk = 0; - PLL3_ClocksTypeDef pll3_clocks; + uint32_t clocksource; + uint32_t pclk = 0; + PLL3_ClocksTypeDef pll3_clocks; - if(i2c == I2C_1 || i2c == I2C_2 || i2c == I2C_3) { - clocksource = __HAL_RCC_GET_I2C123_SOURCE(); - switch(clocksource) - { - case RCC_I2C123CLKSOURCE_D2PCLK1: - pclk = HAL_RCC_GetPCLK1Freq(); - break; - case RCC_I2C123CLKSOURCE_PLL3: - HAL_RCCEx_GetPLL3ClockFreq(&pll3_clocks); - pclk = pll3_clocks.PLL3_R_Frequency; - break; - case RCC_I2C123CLKSOURCE_HSI: - pclk = HSI_VALUE; - break; - case RCC_I2C123CLKSOURCE_CSI: - pclk = CSI_VALUE; - break; - default: + if (i2c == I2C_1 || i2c == I2C_2 || i2c == I2C_3) { + clocksource = __HAL_RCC_GET_I2C123_SOURCE(); + switch (clocksource) { + case RCC_I2C123CLKSOURCE_D2PCLK1: + pclk = HAL_RCC_GetPCLK1Freq(); + break; + case RCC_I2C123CLKSOURCE_PLL3: + HAL_RCCEx_GetPLL3ClockFreq(&pll3_clocks); + pclk = pll3_clocks.PLL3_R_Frequency; + break; + case RCC_I2C123CLKSOURCE_HSI: + pclk = HSI_VALUE; + break; + case RCC_I2C123CLKSOURCE_CSI: + pclk = CSI_VALUE; + break; + default: + // should not happend + error("I2C123: Invalid clock source"); + break; + } + } else if (i2c == I2C_4) { + clocksource = __HAL_RCC_GET_I2C4_SOURCE(); + switch (clocksource) { + case RCC_I2C4CLKSOURCE_D3PCLK1: + pclk = HAL_RCCEx_GetD3PCLK1Freq(); + break; + case RCC_I2C4CLKSOURCE_PLL3: + HAL_RCCEx_GetPLL3ClockFreq(&pll3_clocks); + pclk = pll3_clocks.PLL3_R_Frequency; + break; + case RCC_I2C4CLKSOURCE_HSI: + pclk = HSI_VALUE; + break; + case RCC_I2C4CLKSOURCE_CSI: + pclk = CSI_VALUE; + break; + default: + // should not happend + error("I2C4: Invalid clock source"); + break; + } + } else { // should not happend - error("I2C123: Invalid clock source"); - break; + error("I2C: unknown instance"); } - } - else if(i2c == I2C_4) { - clocksource = __HAL_RCC_GET_I2C4_SOURCE(); - switch(clocksource) - { - case RCC_I2C4CLKSOURCE_D3PCLK1: - pclk = HAL_RCCEx_GetD3PCLK1Freq(); - break; - case RCC_I2C4CLKSOURCE_PLL3: - HAL_RCCEx_GetPLL3ClockFreq(&pll3_clocks); - pclk = pll3_clocks.PLL3_R_Frequency; - break; - case RCC_I2C4CLKSOURCE_HSI: - pclk = HSI_VALUE; - break; - case RCC_I2C4CLKSOURCE_CSI: - pclk = CSI_VALUE; - break; - default: - // should not happend - error("I2C4: Invalid clock source"); - break; - } - } - else { - // should not happend - error("I2C: unknown instance"); - } - return pclk; + return pclk; } /** * @} @@ -415,16 +388,16 @@ static uint32_t I2C_GetPclk(I2CName i2c) */ uint32_t get_i2c_timing(I2CName i2c, int hz) { - uint32_t tim; - uint32_t pclk; + uint32_t tim; + uint32_t pclk; - I2c_valid_timing_nbr = 0; + I2c_valid_timing_nbr = 0; - pclk = I2C_GetPclk(i2c); + pclk = I2C_GetPclk(i2c); - tim = I2C_ComputeTiming(pclk, hz); + tim = I2C_ComputeTiming(pclk, hz); - return tim; + return tim; } /** * @}