int spi_init_slave(spi_t dev, spi_conf_t conf, char(*cb)(char data))
{
SPI_TypeDef *spi_port;
switch (dev) {
#if SPI_0_EN
case SPI_0:
spi_port = SPI_0_DEV;
/* enable clocks */
SPI_0_CLKEN();
SPI_0_SCK_PORT_CLKEN();
SPI_0_MISO_PORT_CLKEN();
SPI_0_MOSI_PORT_CLKEN();
/* configure interrupt channel */
NVIC_SetPriority(SPI_0_IRQ, SPI_IRQ_PRIO); /* set SPI interrupt priority */
NVIC_EnableIRQ(SPI_0_IRQ); /* set SPI interrupt priority */
break;
#endif /* SPI_0_EN */
#if SPI_1_EN
case SPI_1:
spi_port = SPI_1_DEV;
/* enable clocks */
SPI_1_CLKEN();
SPI_1_SCK_PORT_CLKEN();
SPI_1_MISO_PORT_CLKEN();
SPI_1_MOSI_PORT_CLKEN();
/* configure interrupt channel */
NVIC_SetPriority(SPI_1_IRQ, SPI_IRQ_PRIO);
NVIC_EnableIRQ(SPI_1_IRQ);
break;
#endif /* SPI_1_EN */
#if SPI_2_EN
case SPI_2:
spi_port = SPI_2_DEV;
/* enable clocks */
SPI_2_CLKEN();
SPI_2_SCK_PORT_CLKEN();
SPI_2_MISO_PORT_CLKEN();
SPI_2_MOSI_PORT_CLKEN();
/* configure interrupt channel */
NVIC_SetPriority(SPI_2_IRQ, SPI_IRQ_PRIO);
NVIC_EnableIRQ(SPI_2_IRQ);
break;
#endif /* SPI_2_EN */
default:
return -1;
}
/* configure sck, miso and mosi pin */
spi_conf_pins(dev);
/***************** SPI-Init *****************/
spi_port->I2SCFGR &= ~(SPI_I2SCFGR_I2SMOD);
spi_port->CR1 = 0;
spi_port->CR2 = 0;
/* enable RXNEIE flag to enable rx buffer not empty interrupt */
spi_port->CR2 |= (SPI_CR2_RXNEIE); /*1:not masked */
spi_port->CR1 |= (conf);
/* the NSS (chip select) is managed by software and NSS is low (slave enabled) */
spi_port->CR1 |= SPI_CR1_SSM;
/* set callback */
spi_config[dev].cb = cb;
/* enable SPI device */
spi_port->CR1 |= SPI_CR1_SPE;
return 0;
}
int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
{
uint8_t speed_devider;
SPI_TypeDef *spi_port;
switch (speed) {
case SPI_SPEED_100KHZ:
return -2; /* not possible for stm32f4, APB2 minimum is 328 kHz */
break;
case SPI_SPEED_400KHZ:
speed_devider = 0x05 + spi_bus_div_map[dev]; /* makes 656 kHz */
break;
case SPI_SPEED_1MHZ:
speed_devider = 0x04 + spi_bus_div_map[dev]; /* makes 1.3 MHz */
break;
case SPI_SPEED_5MHZ:
speed_devider = 0x02 + spi_bus_div_map[dev]; /* makes 5.3 MHz */
break;
case SPI_SPEED_10MHZ:
speed_devider = 0x01 + spi_bus_div_map[dev]; /* makes 10.5 MHz */
break;
default:
return -1;
}
switch (dev) {
#if SPI_0_EN
case SPI_0:
spi_port = SPI_0_DEV;
/* enable clocks */
SPI_0_CLKEN();
SPI_0_SCK_PORT_CLKEN();
SPI_0_MISO_PORT_CLKEN();
SPI_0_MOSI_PORT_CLKEN();
break;
#endif /* SPI_0_EN */
#if SPI_1_EN
case SPI_1:
spi_port = SPI_1_DEV;
/* enable clocks */
SPI_1_CLKEN();
SPI_1_SCK_PORT_CLKEN();
SPI_1_MISO_PORT_CLKEN();
SPI_1_MOSI_PORT_CLKEN();
break;
#endif /* SPI_1_EN */
#if SPI_2_EN
case SPI_2:
spi_port = SPI_2_DEV;
/* enable clocks */
SPI_2_CLKEN();
SPI_2_SCK_PORT_CLKEN();
SPI_2_MISO_PORT_CLKEN();
SPI_2_MOSI_PORT_CLKEN();
break;
#endif /* SPI_2_EN */
default:
return -2;
}
/* configure SCK, MISO and MOSI pin */
spi_conf_pins(dev);
/**************** SPI-Init *****************/
spi_port->I2SCFGR &= ~(SPI_I2SCFGR_I2SMOD);/* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
spi_port->CR1 = 0;
spi_port->CR2 = 0;
/* the NSS (chip select) is managed purely by software */
spi_port->CR1 |= SPI_CR1_SSM | SPI_CR1_SSI;
spi_port->CR1 |= (speed_devider << 3); /* Define serial clock baud rate. 001 leads to f_PCLK/4 */
spi_port->CR1 |= (SPI_CR1_MSTR); /* 1: master configuration */
spi_port->CR1 |= (conf);
/* enable SPI */
spi_port->CR1 |= (SPI_CR1_SPE);
return 0;
}
int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
{
uint8_t speed_divider;
switch (speed) {
case SPI_SPEED_100KHZ:
return -2; /* not possible for stm32f3 */
break;
case SPI_SPEED_400KHZ:
speed_divider = 7; /* makes 656 kHz */
break;
case SPI_SPEED_1MHZ:
speed_divider = 6; /* makes 1.3 MHz */
break;
case SPI_SPEED_5MHZ:
speed_divider = 4; /* makes 5.3 MHz */
break;
case SPI_SPEED_10MHZ:
speed_divider = 3; /* makes 10.5 MHz */
break;
default:
return -1;
}
switch (dev) {
#if SPI_0_EN
case SPI_0:
/* enable clocks */
SPI_0_CLKEN();
SPI_0_SCK_PORT_CLKEN();
SPI_0_MISO_PORT_CLKEN();
SPI_0_MOSI_PORT_CLKEN();
break;
#endif /* SPI_0_EN */
#if SPI_1_EN
case SPI_1:
/* enable clocks */
SPI_1_CLKEN();
SPI_1_SCK_PORT_CLKEN();
SPI_1_MISO_PORT_CLKEN();
SPI_1_MOSI_PORT_CLKEN();
break;
#endif /* SPI_1_EN */
#if SPI_2_EN
case SPI_2:
/* enable clocks */
SPI_2_CLKEN();
SPI_2_SCK_PORT_CLKEN();
SPI_2_MISO_PORT_CLKEN();
SPI_2_MOSI_PORT_CLKEN();
break;
#endif /* SPI_2_EN */
default:
return -2;
}
/* configure SCK, MISO and MOSI pin */
spi_conf_pins(dev);
/**************** SPI-Init *****************/
#ifdef CPU_MODEL_STM32F303VC
spi[dev]->I2SCFGR &= ~(SPI_I2SCFGR_I2SMOD);/* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
#endif
spi[dev]->CR1 = 0;
spi[dev]->CR2 = 0;
/* the NSS (chip select) is managed purely by software */
spi[dev]->CR1 |= SPI_CR1_SSM | SPI_CR1_SSI;
spi[dev]->CR1 |= (speed_divider << 3); /* Define serial clock baud rate. 001 leads to f_PCLK/4 */
spi[dev]->CR1 |= (SPI_CR1_MSTR); /* 1: master configuration */
spi[dev]->CR1 |= (conf);
spi[dev]->CR2 |= SPI_CR2_FRXTH; /* set FIFO reception threshold to 8bit (default: 16bit) */
/* enable SPI */
spi[dev]->CR1 |= (SPI_CR1_SPE);
return 0;
}