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cpu/stm32/periph/i2c: export PERIPH_I2C_MAX_BYTES_PER_FRAME #19279

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Feb 14, 2023
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cpu/stm32/periph/i2c: export PERIPH_I2C_MAX_BYTES_PER_FRAME #19279

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13 changes: 13 additions & 0 deletions cpu/stm32/include/periph/cpu_i2c.h
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,19 @@ static const i2c_timing_param_t timing_params[] = {
CPU_FAM_STM32G0 || CPU_FAM_STM32G4 || CPU_FAM_STM32U5 ||
CPU_FAM_STM32WB || CPU_FAM_STM32WL */

#if defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32F3) || \
defined(CPU_FAM_STM32F7) || defined(CPU_FAM_STM32G0) || \
defined(CPU_FAM_STM32G4) || defined(CPU_FAM_STM32L0) || \
defined(CPU_FAM_STM32L4) || defined(CPU_FAM_STM32L5) || \
defined(CPU_FAM_STM32U5) || defined(CPU_FAM_STM32WB) || \
defined(CPU_FAM_STM32WL)
/**
* @brief The I2C implementation supports only a limited frame size.
* See i2c_1.c
*/
#define PERIPH_I2C_MAX_BYTES_PER_FRAME (256U)
#endif

#ifdef __cplusplus
}
#endif
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5 changes: 2 additions & 3 deletions cpu/stm32/periph/i2c_1.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,6 @@
#include "debug.h"

#define TICK_TIMEOUT (0xFFFF)
#define MAX_BYTES_PER_FRAME (256)

#define I2C_IRQ_PRIO (1)
#define I2C_FLAG_READ (I2C_READ << I2C_CR2_RD_WRN_Pos)
Expand Down Expand Up @@ -217,7 +216,7 @@ int i2c_write_regs(i2c_t dev, uint16_t addr, uint16_t reg,
int i2c_read_bytes(i2c_t dev, uint16_t address, void *data,
size_t length, uint8_t flags)
{
assert(dev < I2C_NUMOF && length < MAX_BYTES_PER_FRAME);
assert(dev < I2C_NUMOF && length < PERIPH_I2C_MAX_BYTES_PER_FRAME);

I2C_TypeDef *i2c = i2c_config[dev].dev;
assert(i2c != NULL);
Expand Down Expand Up @@ -275,7 +274,7 @@ int i2c_write_bytes(i2c_t dev, uint16_t address, const void *data,
static int _write(I2C_TypeDef *i2c, uint16_t addr, const void *data,
size_t length, uint8_t flags, uint32_t cr2_flags)
{
assert(i2c != NULL && length < MAX_BYTES_PER_FRAME);
assert(i2c != NULL && length < PERIPH_I2C_MAX_BYTES_PER_FRAME);

/* If reload was NOT set, must either stop or start */
if ((i2c->ISR & I2C_ISR_TC) && (flags & I2C_NOSTART)) {
Expand Down