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Merge pull request #15846 from benpicco/cpu/sam0_common-spi_fixes

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cpu/sam0_common: SPI: MOSI only operation & fix for adafruit-itsybitsy-m4
This commit is contained in:
Dylan Laduranty 2021-01-28 09:26:28 +01:00 committed by GitHub
commit 1d0dbb4626
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1 changed files with 14 additions and 8 deletions
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18
cpu/sam0_common/periph/spi.c
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@ -350,13 +350,15 @@ void spi_init(spi_t bus)
void spi_init_pins(spi_t bus)
{
/* MISO must always have PD/PU, see #5968. This is a ~65uA difference */
if (gpio_is_valid(spi_config[bus].miso_pin)) {
gpio_init(spi_config[bus].miso_pin, GPIO_IN_PD);
gpio_init_mux(spi_config[bus].miso_pin, spi_config[bus].miso_mux);
}
gpio_init(spi_config[bus].mosi_pin, GPIO_OUT);
gpio_init(spi_config[bus].clk_pin, GPIO_OUT);
gpio_init_mux(spi_config[bus].miso_pin, spi_config[bus].miso_mux);
gpio_init_mux(spi_config[bus].mosi_pin, spi_config[bus].mosi_mux);
/* clk_pin will be muxed during acquire / release */
/* mosi_pin, clk_pin will be muxed during acquire / release */
mutex_unlock(&locks[bus]);
}
@ -364,8 +366,9 @@ void spi_deinit_pins(spi_t bus)
{
mutex_lock(&locks[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)
@ -385,6 +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;
@ -392,9 +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();