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cpu/nrf52: add locking for shared peripherals

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This commit is contained in:
Benjamin Valentin 2022-08-19 15:18:41 +02:00
parent 2dd59236c8
commit 5129d249e9
2 changed files with 55 additions and 0 deletions
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28
cpu/nrf52/include/periph_cpu.h
View File

@ -264,6 +264,34 @@ void spi_twi_irq_register_spi(NRF_SPIM_Type *bus,
void spi_twi_irq_register_i2c(NRF_TWIM_Type *bus,
spi_twi_irq_cb_t cb, void *arg);
/**
* @brief Acquire the shared I2C/SPI peripheral in I2C mode
*
* @param bus bus to acquire exclusive access on
*/
void nrf5x_i2c_acquire(NRF_TWIM_Type *bus);
/**
* @brief Release the shared I2C/SPI peripheral in I2C mode
*
* @param bus bus to release exclusive access on
*/
void nrf5x_i2c_release(NRF_TWIM_Type *bus);
/**
* @brief Acquire the shared I2C/SPI peripheral in SPI mode
*
* @param bus bus to acquire exclusive access on
*/
void nrf5x_spi_release(NRF_SPIM_Type *bus);
/**
* @brief Acquire the shared I2C/SPI peripheral in SPI mode
*
* @param bus bus to release exclusive access on
*/
void nrf5x_spi_acquire(NRF_SPIM_Type *bus);
/**
* @brief USBDEV buffers must be word aligned because of DMA restrictions
*/

27
cpu/nrf52/spi_twi_irq.c
View File

@ -24,6 +24,7 @@
#include <assert.h>
#include "cpu.h"
#include "mutex.h"
#include "periph_cpu.h"
#if NRF_SPIM0_BASE != NRF_TWIM0_BASE
@ -59,6 +60,8 @@
static spi_twi_irq_cb_t _irq[SPIM_COUNT];
static void *_irq_arg[SPIM_COUNT];
static mutex_t _locks[SPIM_COUNT];
/* I2C and SPI share peripheral addresses */
static size_t _spi_dev2num(void *dev)
{
@ -140,6 +143,30 @@ void spi_twi_irq_register_i2c(NRF_TWIM_Type *bus,
NVIC_EnableIRQ(_isr[num]);
}
void nrf5x_i2c_acquire(NRF_TWIM_Type *bus)
{
size_t num = _i2c_dev2num(bus);
mutex_lock(&_locks[num]);
}
void nrf5x_spi_acquire(NRF_SPIM_Type *bus)
{
size_t num = _spi_dev2num(bus);
mutex_lock(&_locks[num]);
}
void nrf5x_i2c_release(NRF_TWIM_Type *bus)
{
size_t num = _i2c_dev2num(bus);
mutex_unlock(&_locks[num]);
}
void nrf5x_spi_release(NRF_SPIM_Type *bus)
{
size_t num = _spi_dev2num(bus);
mutex_unlock(&_locks[num]);
}
void ISR_SPIM0(void)
{
_irq[0](_irq_arg[0]);