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cpu/sam0_common: SPI: only mux MISO on spi_acquire()

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This commit is contained in:
Benjamin Valentin 2021-01-24 16:31:38 +01:00
parent 00a467e86d
commit 31bf0c5257
1 changed files with 6 additions and 6 deletions
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12
cpu/sam0_common/periph/spi.c
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@ -356,11 +356,9 @@ void spi_init_pins(spi_t bus)
}
gpio_init(spi_config[bus].mosi_pin, GPIO_OUT);
gpio_init_mux(spi_config[bus].mosi_pin, spi_config[bus].mosi_mux);
gpio_init(spi_config[bus].clk_pin, GPIO_OUT);
/* clk_pin will be muxed during acquire / release */
/* mosi_pin, clk_pin will be muxed during acquire / release */
mutex_unlock(&locks[bus]);
}
@ -371,7 +369,6 @@ void spi_deinit_pins(spi_t bus)
if (gpio_is_valid(spi_config[bus].miso_pin)) {
gpio_disable_mux(spi_config[bus].miso_pin);
}
gpio_disable_mux(spi_config[bus].mosi_pin);
}
int spi_acquire(spi_t bus, spi_cs_t cs, spi_mode_t mode, spi_clk_t clk)
@ -391,6 +388,7 @@ int spi_acquire(spi_t bus, spi_cs_t cs, spi_mode_t mode, spi_clk_t clk)
}
/* mux clk_pin to SPI peripheral */
gpio_init_mux(spi_config[bus].mosi_pin, spi_config[bus].mosi_mux);
gpio_init_mux(spi_config[bus].clk_pin, spi_config[bus].clk_mux);
return SPI_OK;
@ -398,9 +396,11 @@ int spi_acquire(spi_t bus, spi_cs_t cs, spi_mode_t mode, spi_clk_t clk)
void spi_release(spi_t bus)
{
/* Demux clk_pin back to GPIO_OUT function. Otherwise it will get HIGH-Z
* and lead to unexpected current draw by SPI salves. */
/* Demux clk_pin and mosi_pin back to GPIO_OUT function.
* Otherwise it will get HIGH-Z and lead to unexpected current draw by SPI salves.
*/
gpio_disable_mux(spi_config[bus].clk_pin);
gpio_disable_mux(spi_config[bus].mosi_pin);
if (_is_qspi(bus)) {
_qspi_release();