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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_uart/include/hardware/uart.h
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@ -9,6 +9,7 @@
#include "pico.h"
#include "hardware/structs/uart.h"
#include "hardware/regs/dreq.h"
// PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_UART, Enable/disable assertions in the UART module, type=bool, default=0, group=hardware_uart
#ifndef PARAM_ASSERTIONS_ENABLED_UART
@ -432,6 +433,19 @@ static inline void uart_default_tx_wait_blocking(void) {
*/
bool uart_is_readable_within_us(uart_inst_t *uart, uint32_t us);
/*! \brief Return the DREQ to use for pacing transfers to/from a particular UART instance
* \ingroup hardware_uart
*
* \param uart UART instance. \ref uart0 or \ref uart1
* \param is_tx true for sending data to the UART instance, false for receiving data from the UART instance
*/
static inline uint uart_get_dreq(uart_inst_t *uart, bool is_tx) {
static_assert(DREQ_UART0_RX == DREQ_UART0_TX + 1, "");
static_assert(DREQ_UART1_RX == DREQ_UART1_TX + 1, "");
static_assert(DREQ_UART1_TX == DREQ_UART0_TX + 2, "");
return DREQ_UART0_TX + uart_get_index(uart) * 2 + !is_tx;
}
#ifdef __cplusplus
}
#endif