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

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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_spi/include/hardware/spi.h
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@ -10,6 +10,7 @@
#include "pico.h"
#include "pico/time.h"
#include "hardware/structs/spi.h"
#include "hardware/regs/dreq.h"
// PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_SPI, Enable/disable assertions in the SPI module, type=bool, default=0, group=hardware_spi
#ifndef PARAM_ASSERTIONS_ENABLED_SPI
@ -337,6 +338,19 @@ int spi_write16_blocking(spi_inst_t *spi, const uint16_t *src, size_t len);
*/
int spi_read16_blocking(spi_inst_t *spi, uint16_t repeated_tx_data, uint16_t *dst, size_t len);
/*! \brief Return the DREQ to use for pacing transfers to/from a particular SPI instance
* \ingroup hardware_spi
*
* \param spi SPI instance specifier, either \ref spi0 or \ref spi1
* \param is_tx true for sending data to the SPI instance, false for receiving data from the SPI instance
*/
static inline uint spi_get_dreq(spi_inst_t *spi, bool is_tx) {
static_assert(DREQ_SPI0_RX == DREQ_SPI0_TX + 1, "");
static_assert(DREQ_SPI1_RX == DREQ_SPI1_TX + 1, "");
static_assert(DREQ_SPI1_TX == DREQ_SPI0_TX + 2, "");
return DREQ_SPI0_TX + spi_get_index(spi) * 2 + !is_tx;
}
#ifdef __cplusplus
}
#endif