void i2c_init(const uint32_t busnum, uint32_t rate)
{
I2C_ *ib = (I2C_ *)i2c_buses[busnum];
/* Ensure that the external bus doesn't interfere with i2c */
/* AFIO->MAPR2 |= 0x400; */
/*
Enable alternate functions, port B and i2c
*/
RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN;
if (I2C_BUS_1 == busnum) {
gpio_conf_af(GPIOB, 6, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ, GPIO_RESISTORS_PULLUP);
gpio_conf_af(GPIOB, 7, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ, GPIO_RESISTORS_PULLUP);
gpio_map_af(GPIOB, 6, GPIO_AF_I2C1);
gpio_map_af(GPIOB, 7, GPIO_AF_I2C1);
} else {
/* We're careful with this for now. It's shared with the debug USART */
return;
}
#if 0
/* SCL1 */
GPIO_CONF_OUTPUT_PORT(B, 6, ALT_OPEN_DRAIN, 50);
/* SDA1 */
GPIO_CONF_OUTPUT_PORT(B, 7, ALT_OPEN_DRAIN, 50);
#endif
#if 0
/* Disable */
ib->CR1 &= ~(I2C_CR1_PE);
/* Fast */
/* ib->CCR &= I2C_CCR_FS; */
/* CCR */
tmp = ib->CCR;
tmp &= 0xf000;
tmp |= 0x5e;
ib->CCR = tmp;
/* Freq */
tmp = ib->CR2;
tmp &= 0xffc0;
tmp |= 0x20;
ib->CR2 = tmp;
/* TRISE */
ib->TRISE = 0x0b;
#else
/* Disable peripheral while configuring */
ib->CR1 &= ~(I2C_CR1_PE);
/* Bit 14 should be kept at 1 by software */
ib->OAR1 = 0x4000;
/* Frequency, 8 MHz */
ib->CR2 = 0x0008;
/* clock configure, period is 0x28 (dec 40) * PCLK */
ib->CCR = 0x0028;
/* Rise time... */
ib->TRISE = 0x0009;
/* Set ACK bit */
ib->CR1 |= I2C_CR1_ACK;
#endif
/* Enable */
ib->CR1 |= I2C_CR1_PE;
}
void hal_init(void)
{
int i;
uint32_t volatile dummy;
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->APB2ENR |= (RCC_APB2ENR_SPI1EN);
RCC->APB1ENR |= (RCC_APB1ENR_SPI2EN);
/* Configure I/O */
#if (RF230_BUS == 1)
/* SPI: MISO; MOSI and CLK */
gpio_conf_af(GPIOA, 5, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ, GPIO_RESISTORS_PULLDN);
gpio_conf_af(GPIOA, 6, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ, GPIO_RESISTORS_PULLDN);
gpio_conf_af(GPIOA, 7, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ, GPIO_RESISTORS_PULLDN);
gpio_map_af(GPIOA, 5, GPIO_AF_SPI1);
gpio_map_af(GPIOA, 6, GPIO_AF_SPI1);
gpio_map_af(GPIOA, 7, GPIO_AF_SPI1);
/* Manual CS */
gpio_conf_output(GPIOA, 4, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ);
gpio_set_resistors(GPIOA, 4, GPIO_RESISTORS_PULLUP);
/* Reset */
gpio_conf_output(GPIOA, 8, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ);
/* Sleep */
gpio_conf_output(GPIOA, 10, GPIO_OUTPUT_TYPE_PPULL, GPIO_OSPEED_40MHZ);
#if 0
/* printf("Initiating GPIO for radio\r\n"); */
/* CS */
GPIO_CONF_OUTPUT_PORT(A, 4, PUSH_PULL, 50);
/* CLOCK */
GPIO_CONF_OUTPUT_PORT(A, 5, ALT_PUSH_PULL, 50);
/* MISO */
GPIO_CONF_OUTPUT_PORT(A, 6, ALT_PUSH_PULL, 50);
/* MOSI */
GPIO_CONF_OUTPUT_PORT(A, 7, ALT_PUSH_PULL, 50);
/* Reset */
GPIO_CONF_OUTPUT_PORT(A, 8, PUSH_PULL, 50);
/* Sleep */
GPIO_CONF_OUTPUT_PORT(A, 10, PUSH_PULL, 50);
/* Set up interrupt pin from radio */
/* PA11 -> EXTI11, PA -> set EXTICR to 0 */
AFIO->EXTICR[2] &= 0x0FfF;
/* Enable clock to peripheral IOPA */
RCC->APB2ENR |= (RCC_APB2ENR_AFIOEN |
RCC_APB2ENR_IOPAEN);
/* Configure IRQ pin as input */
GPIO_CONF_INPUT_PORT(A, 11, FLOATING);
/* Unmask interrupt for interrupt line */
EXTI->IMR |= (1 << RADIO_IRQ_PIN);
/* Unmask event for interrupt line */
EXTI->EMR |= (1 << RADIO_IRQ_PIN);
/* Rising edge trigger */
EXTI->RTSR |= (1 << RADIO_IRQ_PIN);
/* Falling edge trigger */
/* EXTI->FTSR |= (1 << RADIO_IRQ_PIN); */
dummy = EXTI->PR;
NVIC->ISER[1] |= (1 << (EXTI15_10_IRQChannel & 0x1F));
#endif
#else
/* CS */
GPIO_CONF_OUTPUT_PORT(B, 12, PUSH_PULL, 50);
/* CLOCK */
GPIO_CONF_OUTPUT_PORT(B, 13, ALT_PUSH_PULL, 50);
/* MISO */
GPIO_CONF_OUTPUT_PORT(B, 14, ALT_PUSH_PULL, 50);
/* MOSI */
GPIO_CONF_OUTPUT_PORT(B, 15, ALT_PUSH_PULL, 50);
/* Reset */
GPIO_CONF_OUTPUT_PORT(B, 10, PUSH_PULL, 50);
/* Sleep */
GPIO_CONF_OUTPUT_PORT(B, 11, PUSH_PULL, 50);
/* Set up interrupt pin from radio */
/* PC11 -> EXTI11, PC -> set EXTICR bits to 2 */
AFIO->EXTICR[2] &= 0xFF0F;
AFIO->EXTICR[2] |= 0x0020;
/* Enable clock to peripheral IOPC */
RCC->APB2ENR |= (RCC_APB2ENR_AFIOEN |
RCC_APB2ENR_IOPCEN);
/* Configure IRQ pin as input */
GPIO_CONF_INPUT_PORT(C, 9, FLOATING);
/* Unmask interrupt for line 9 */
EXTI->IMR |= (1 << RADIO_IRQ_PIN);
/* Unmask event for line 9 */
EXTI->EMR |= (1 << RADIO_IRQ_PIN);
/* Rising edge trigger */
EXTI->RTSR |= (1 << RADIO_IRQ_PIN);
/* Falling edge trigger */
/* EXTI->FTSR |= (1 << RADIO_IRQ_PIN); */
dummy = EXTI->PR;
NVIC->ISER[0] |= (1 << (EXTI9_5_IRQChannel & 0x1F));
#endif
/* Assert reset */
hal_set_rst_low();
/* slptr */
hal_set_slptr_low();
/* Don't do like this...*/
for(i=0; i<100000; i++)
;
/* Init SPI */
uspi_init(RF230_SPI_BUS, 000);
/* No chip select */
spi_radio_cs(1);
/* De-assert reset */
hal_set_rst_high();
}
