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Add DREQ methods for PWM/SPI/UART/I2C (#603)

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This commit is contained in:
Graham Sanderson
2021-10-12 16:04:16 -05:00
committed by GitHub
parent 2f2e62968d
commit f808b5f2dc
5 changed files with 62 additions and 2 deletions
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14
src/rp2_common/hardware_i2c/include/hardware/i2c.h
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@ -10,6 +10,7 @@
#include "pico.h"
#include "pico/time.h"
#include "hardware/structs/i2c.h"
#include "hardware/regs/dreq.h"
// PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_I2C, Enable/disable assertions in the I2C module, type=bool, default=0, group=hardware_i2c
#ifndef PARAM_ASSERTIONS_ENABLED_I2C
@ -311,6 +312,19 @@ static inline void i2c_read_raw_blocking(i2c_inst_t *i2c, uint8_t *dst, size_t l
}
}
/*! \brief Return the DREQ to use for pacing transfers to/from a particular I2C instance
* \ingroup hardware_i2c
*
* \param i2c Either \ref i2c0 or \ref i2c1
* \param is_tx true for sending data to the I2C instance, false for receiving data from the I2C instance
*/
static inline uint i2c_get_dreq(i2c_inst_t *i2c, bool is_tx) {
static_assert(DREQ_I2C0_RX == DREQ_I2C0_TX + 1, "");
static_assert(DREQ_I2C1_RX == DREQ_I2C1_TX + 1, "");
static_assert(DREQ_I2C1_TX == DREQ_I2C0_TX + 2, "");
return DREQ_I2C0_TX + i2c_hw_index(i2c) * 2 + !is_tx;
}
#ifdef __cplusplus
}
#endif