diff options
Diffstat (limited to 'stmhal/i2c.c')
| -rw-r--r-- | stmhal/i2c.c | 47 |
1 files changed, 37 insertions, 10 deletions
diff --git a/stmhal/i2c.c b/stmhal/i2c.c index 412a8e3638..e818ec380f 100644 --- a/stmhal/i2c.c +++ b/stmhal/i2c.c @@ -37,14 +37,6 @@ #include "dma.h" #include "i2c.h" -#if !defined(MICROPY_HW_I2C_BAUDRATE_DEFAULT) -#define MICROPY_HW_I2C_BAUDRATE_DEFAULT 400000 -#endif - -#if !defined(MICROPY_HW_I2C_BAUDRATE_MAX) -#define MICROPY_HW_I2C_BAUDRATE_MAX 400000 -#endif - /// \moduleref pyb /// \class I2C - a two-wire serial protocol /// @@ -134,10 +126,42 @@ const pyb_i2c_obj_t pyb_i2c_obj[] = { #endif }; -#if defined(MICROPY_HW_I2C_BAUDRATE_TIMING) +#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4) + // The STM32F0, F3, F7 and L4 use a TIMINGR register rather than ClockSpeed and // DutyCycle. +#if defined(STM32F746xx) + +// The value 0x40912732 was obtained from the DISCOVERY_I2Cx_TIMING constant +// defined in the STM32F7Cube file Drivers/BSP/STM32F746G-Discovery/stm32f7456g_discovery.h +#define MICROPY_HW_I2C_BAUDRATE_TIMING {{100000, 0x40912732}} +#define MICROPY_HW_I2C_BAUDRATE_DEFAULT (100000) +#define MICROPY_HW_I2C_BAUDRATE_MAX (100000) + +#elif defined(STM32F767xx) || defined(STM32F769xx) + +// These timing values are for f_I2CCLK=54MHz and are only approximate +#define MICROPY_HW_I2C_BAUDRATE_TIMING { \ + {100000, 0xb0420f13}, \ + {400000, 0x70330309}, \ + {1000000, 0x50100103}, \ + } +#define MICROPY_HW_I2C_BAUDRATE_DEFAULT (400000) +#define MICROPY_HW_I2C_BAUDRATE_MAX (1000000) + +#elif defined(MCU_SERIES_L4) + +// The value 0x90112626 was obtained from the DISCOVERY_I2C1_TIMING constant +// defined in the STM32L4Cube file Drivers/BSP/STM32L476G-Discovery/stm32l476g_discovery.h +#define MICROPY_HW_I2C_BAUDRATE_TIMING {{100000, 0x90112626}} +#define MICROPY_HW_I2C_BAUDRATE_DEFAULT (100000) +#define MICROPY_HW_I2C_BAUDRATE_MAX (100000) + +#else +#error "no I2C timings for this MCU" +#endif + STATIC const struct { uint32_t baudrate; uint32_t timing; @@ -167,6 +191,9 @@ uint32_t i2c_get_baudrate(I2C_InitTypeDef *init) { #else +#define MICROPY_HW_I2C_BAUDRATE_DEFAULT (400000) +#define MICROPY_HW_I2C_BAUDRATE_MAX (400000) + STATIC void i2c_set_baudrate(I2C_InitTypeDef *init, uint32_t baudrate) { init->ClockSpeed = baudrate; init->DutyCycle = I2C_DUTYCYCLE_16_9; @@ -176,7 +203,7 @@ uint32_t i2c_get_baudrate(I2C_InitTypeDef *init) { return init->ClockSpeed; } -#endif // MICROPY_HW_I2C_BAUDRATE_TIMING +#endif void i2c_init0(void) { // reset the I2C1 handles |