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path: root/platforms/chibios/drivers/spi_master.c
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Diffstat (limited to 'platforms/chibios/drivers/spi_master.c')
-rw-r--r--platforms/chibios/drivers/spi_master.c155
1 files changed, 117 insertions, 38 deletions
diff --git a/platforms/chibios/drivers/spi_master.c b/platforms/chibios/drivers/spi_master.c
index fcdbc9ecf0..6417b7077f 100644
--- a/platforms/chibios/drivers/spi_master.c
+++ b/platforms/chibios/drivers/spi_master.c
@@ -19,13 +19,33 @@
#include "timer.h"
static bool spiStarted = false;
-
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
-static pin_t currentSlavePin;
+static pin_t current_slave_pin = NO_PIN;
+static bool current_cs_active_low = true;
#endif
static SPIConfig spiConfig;
+static inline void spi_select(void) {
+ spiSelect(&SPI_DRIVER);
+
+#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
+ if (current_slave_pin != NO_PIN) {
+ gpio_write_pin(current_slave_pin, current_cs_active_low ? 0 : 1);
+ }
+#endif
+}
+
+static inline void spi_unselect(void) {
+#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
+ if (current_slave_pin != NO_PIN) {
+ gpio_write_pin(current_slave_pin, current_cs_active_low ? 1 : 0);
+ }
+#endif
+
+ spiUnselect(&SPI_DRIVER);
+}
+
__attribute__((weak)) void spi_init(void) {
static bool is_initialised = false;
if (!is_initialised) {
@@ -63,7 +83,7 @@ __attribute__((weak)) void spi_init(void) {
}
}
-bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
+bool spi_start_extended(spi_start_config_t *start_config) {
#if (SPI_USE_MUTUAL_EXCLUSION == TRUE)
spiAcquireBus(&SPI_DRIVER);
#endif // (SPI_USE_MUTUAL_EXCLUSION == TRUE)
@@ -71,32 +91,37 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
if (spiStarted) {
return false;
}
-
#if SPI_SELECT_MODE != SPI_SELECT_MODE_NONE
- if (slavePin == NO_PIN) {
+ if (start_config->slave_pin == NO_PIN) {
return false;
}
#endif
#if !(defined(WB32F3G71xx) || defined(WB32FQ95xx))
uint16_t roundedDivisor = 2;
- while (roundedDivisor < divisor) {
+ while (roundedDivisor < start_config->divisor) {
roundedDivisor <<= 1;
}
+# if defined(AT32F415)
+ if (roundedDivisor < 2 || roundedDivisor > 1024) {
+ return false;
+ }
+# else
if (roundedDivisor < 2 || roundedDivisor > 256) {
return false;
}
+# endif
#endif
#if defined(K20x) || defined(KL2x)
spiConfig.tar0 = SPIx_CTARn_FMSZ(7) | SPIx_CTARn_ASC(1);
- if (lsbFirst) {
+ if (start_config->lsb_first) {
spiConfig.tar0 |= SPIx_CTARn_LSBFE;
}
- switch (mode) {
+ switch (start_config->mode) {
case 0:
break;
case 1:
@@ -141,11 +166,11 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
spiConfig.cr0 = SPI_CR0_SELOEN;
spiConfig.cr1 = SPI_CR1_MODE | 8; // 8 bits and in master mode
- if (lsbFirst) {
+ if (start_config->lsb_first) {
spiConfig.cr1 |= SPI_CR1_FIRSTBIT;
}
- switch (mode) {
+ switch (start_config->mode) {
case 0:
spiConfig.cr1 |= SPI_CR1_FORMAT_MODE0;
break;
@@ -163,17 +188,17 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
spiConfig.cpr = (roundedDivisor - 1) >> 1;
#elif defined(WB32F3G71xx) || defined(WB32FQ95xx)
- if (!lsbFirst) {
- osalDbgAssert(lsbFirst != FALSE, "unsupported lsbFirst");
+ if (!start_config->lsb_first) {
+ osalDbgAssert(start_config->lsb_first != FALSE, "unsupported lsb_first");
}
- if (divisor < 1) {
+ if (start_config->divisor < 1) {
return false;
}
- spiConfig.SPI_BaudRatePrescaler = (divisor << 2);
+ spiConfig.SPI_BaudRatePrescaler = (start_config->divisor << 2);
- switch (mode) {
+ switch (start_config->mode) {
case 0:
spiConfig.SPI_CPHA = SPI_CPHA_1Edge;
spiConfig.SPI_CPOL = SPI_CPOL_Low;
@@ -192,8 +217,8 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
break;
}
#elif defined(MCU_RP)
- if (lsbFirst) {
- osalDbgAssert(lsbFirst == false, "RP2040s PrimeCell SPI implementation does not support sending LSB first.");
+ if (start_config->lsb_first) {
+ osalDbgAssert(start_config->lsb_first == false, "RP2040s PrimeCell SPI implementation does not support sending LSB first.");
}
// Motorola frame format and 8bit transfer data size.
@@ -203,7 +228,7 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
// passed divisor to be the only value to divide the input clock by.
spiConfig.SSPCPSR = roundedDivisor; // Even number from 2 to 254
- switch (mode) {
+ switch (start_config->mode) {
case 0:
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPO; // Clock polarity: low
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPH; // Clock phase: sample on first edge
@@ -221,14 +246,67 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
spiConfig.SSPCR0 |= SPI_SSPCR0_SPH; // Clock phase: sample on second edge transition
break;
}
+#elif defined(AT32F415)
+ spiConfig.ctrl1 = 0;
+
+ if (lsbFirst) {
+ spiConfig.ctrl1 |= SPI_CTRL1_LTF;
+ }
+
+ switch (mode) {
+ case 0:
+ break;
+ case 1:
+ spiConfig.ctrl1 |= SPI_CTRL1_CLKPHA;
+ break;
+ case 2:
+ spiConfig.ctrl1 |= SPI_CTRL1_CLKPOL;
+ break;
+ case 3:
+ spiConfig.ctrl1 |= SPI_CTRL1_CLKPHA | SPI_CTRL1_CLKPOL;
+ break;
+ }
+
+ switch (roundedDivisor) {
+ case 2:
+ break;
+ case 4:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_0;
+ break;
+ case 8:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_1;
+ break;
+ case 16:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0;
+ break;
+ case 32:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2;
+ break;
+ case 64:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_0;
+ break;
+ case 128:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1;
+ break;
+ case 256:
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_2 | SPI_CTRL1_MDIV_1 | SPI_CTRL1_MDIV_0;
+ break;
+ case 512:
+ spiConfig.ctrl2 |= SPI_CTRL1_MDIV_3;
+ break;
+ case 1024:
+ spiConfig.ctrl2 |= SPI_CTRL1_MDIV_3;
+ spiConfig.ctrl1 |= SPI_CTRL1_MDIV_0;
+ break;
+ }
#else
spiConfig.cr1 = 0;
- if (lsbFirst) {
+ if (start_config->lsb_first) {
spiConfig.cr1 |= SPI_CR1_LSBFIRST;
}
- switch (mode) {
+ switch (start_config->mode) {
case 0:
break;
case 1:
@@ -271,31 +349,37 @@ bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
spiStarted = true;
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
- currentSlavePin = slavePin;
+ current_slave_pin = start_config->slave_pin;
+ current_cs_active_low = start_config->cs_active_low;
#endif
#if SPI_SELECT_MODE == SPI_SELECT_MODE_PAD
- spiConfig.ssport = PAL_PORT(slavePin);
- spiConfig.sspad = PAL_PAD(slavePin);
- gpio_set_pin_output(slavePin);
+ spiConfig.ssport = PAL_PORT(start_config->slave_pin);
+ spiConfig.sspad = PAL_PAD(start_config->slave_pin);
+ gpio_set_pin_output(start_config->slave_pin);
#elif SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
- if (slavePin != NO_PIN) {
- gpio_set_pin_output(slavePin);
+ if (start_config->slave_pin != NO_PIN) {
+ gpio_set_pin_output(start_config->slave_pin);
}
#else
# error "Unsupported SPI_SELECT_MODE"
#endif
spiStart(&SPI_DRIVER, &spiConfig);
- spiSelect(&SPI_DRIVER);
-#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
- if (slavePin != NO_PIN) {
- gpio_write_pin_low(slavePin);
- }
-#endif
+ spi_select();
return true;
}
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
+ spi_start_config_t start_config = {0};
+ start_config.slave_pin = slavePin;
+ start_config.lsb_first = lsbFirst;
+ start_config.mode = mode;
+ start_config.divisor = divisor;
+ start_config.cs_active_low = true;
+ return spi_start_extended(&start_config);
+}
+
spi_status_t spi_write(uint8_t data) {
uint8_t rxData;
spiExchange(&SPI_DRIVER, 1, &data, &rxData);
@@ -322,12 +406,7 @@ spi_status_t spi_receive(uint8_t *data, uint16_t length) {
void spi_stop(void) {
if (spiStarted) {
-#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
- if (currentSlavePin != NO_PIN) {
- gpio_write_pin_high(currentSlavePin);
- }
-#endif
- spiUnselect(&SPI_DRIVER);
+ spi_unselect();
spiStop(&SPI_DRIVER);
spiStarted = false;
}