205 lines
6.6 KiB
C
205 lines
6.6 KiB
C
#include <stdint.h>
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#include "stm32f4xx_rcc.h"
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#include <stm32f4xx_syscfg.h>
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#include "stm32f4xx_gpio.h"
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#include <stm32f4xx_exti.h>
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#include <stm_misc.h>
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#include "stm32f4xx_spi.h"
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#include "misc.h"
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#include "systick.h"
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#include "ccdebug.h"
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#include "pybcc3k.h"
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// IRQ on PA14, input, pulled up, active low
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// EN on PC7, output, active high
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// CS on PC6, output, active low
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// SPI2 on PB15=MOSI, PB14=MISO, PB13=SCK
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// SCK for CC3000: max 16MHz, low when idle, data sampled on falling edge
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// TODO this could be really wrong wrt calibration
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void pyb_delay_us(uint32_t usec) {
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volatile uint32_t count = 0;
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const uint32_t utime = (160 * usec / 5);
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do {
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if (++count > utime) {
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return;
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}
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} while (1);
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}
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void pyb_cc3000_set_en(int val) {
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DEBUG_printf("pyb_cc3000_set_en val=%d\n", val);
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if (val) {
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GPIOC->BSRRL = GPIO_Pin_7; // set pin high
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} else {
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GPIOC->BSRRH = GPIO_Pin_7; // set pin low
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}
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}
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void pyb_cc3000_set_cs(int val) {
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DEBUG_printf("pyb_cc3000_set_cs val=%d\n", val);
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if (val) {
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GPIOC->BSRRL = GPIO_Pin_6; // set pin high
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} else {
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GPIOC->BSRRH = GPIO_Pin_6; // set pin low
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}
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}
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int pyb_cc3000_get_irq(void) {
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if ((GPIOA->IDR & GPIO_Pin_14) == 0) {
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return 0;
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} else {
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return 1;
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}
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}
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uint32_t exti14_enabled = 0; // TODO hack; do it properly!
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uint32_t exti14_missed = 0; // TODO hack; do it properly!
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void pyb_cc3000_enable_irq(void) {
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DEBUG_printf("pyb_cc3000_enable_irq: en=%lu miss=%lu\n", exti14_enabled, exti14_missed);
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if (exti14_missed) {
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/* doesn't look like this is needed
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DEBUG_printf("pyb_cc3000_enable_irq: handling missed IRQ\n");
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// TODO hack if we have a pending IRQ
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extern void SpiIntGPIOHandler(void);
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SpiIntGPIOHandler();
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*/
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exti14_missed = 0;
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}
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exti14_enabled = 1;
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}
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void pyb_cc3000_disable_irq(void) {
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DEBUG_printf("pyb_cc3000_disable_irq: en=%lu miss=%lu\n", exti14_enabled, exti14_missed);
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exti14_enabled = 0;
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}
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void pyb_cc3000_pause_spi(void) {
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DEBUG_printf("pyb_cc3000_pause_spi\n");
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exti14_enabled = 0;
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}
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void pyb_cc3000_resume_spi(void) {
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DEBUG_printf("pyb_cc3000_resume_spi\n");
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exti14_enabled = 1;
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}
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static void EXTILine14_Config(void) {
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/* Enable SYSCFG clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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/* Configure PA14 pin as pulled-up input */
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Connect EXTI Line14 to PA14 pin */
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SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource14);
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/* Configure EXTI Line14, falling edge */
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EXTI_InitTypeDef EXTI_InitStructure;
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EXTI_InitStructure.EXTI_Line = EXTI_Line14;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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/* Enable and set EXTI15_10 Interrupt to the lowest priority */
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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void pyb_cc3000_spi_init(void) {
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DEBUG_printf("pyb_cc3000_spi_init\n");
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// enable SPI clock
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
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// GPIO clocks should already be enabled
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/*!< SPI pins configuration *************************************************/
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/*!< Connect SPI pins to AF5 */
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
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GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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/*
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inf.baudRate = 100000; // FIXME - just slow for debug
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inf.spiMode = SPIF_SPI_MODE_1; // Mode 1 CPOL= 0 CPHA= 1
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*/
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/*!< SPI configuration */
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SPI_InitTypeDef SPI_InitStructure;
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // should be correct
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; // clock is low when idle
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; // data latched on second edge, which is falling edge for low-idle
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // software control
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // clock freq = f_PCLK / this_prescale_value
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // should be correct
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SPI_InitStructure.SPI_CRCPolynomial = 7; // ?
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SPI_Init(SPI2, &SPI_InitStructure);
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/*!< Enable the SPI */
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SPI_Cmd(SPI2, ENABLE);
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/*
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// WLAN CS, EN and WALN IRQ Configuration
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jshSetPinStateIsManual(WLAN_CS_PIN, false);
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jshPinOutput(WLAN_CS_PIN, 1); // de-assert CS
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jshSetPinStateIsManual(WLAN_EN_PIN, false);
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jshPinOutput(WLAN_EN_PIN, 0); // disable WLAN
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jshSetPinStateIsManual(WLAN_IRQ_PIN, true);
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jshPinSetState(WLAN_IRQ_PIN, JSHPINSTATE_GPIO_IN_PULLUP); // flip into read mode with pullup
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*/
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// configure wlan CS and EN pins
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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pyb_cc3000_set_cs(1); // de-assert CS
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pyb_cc3000_set_en(0); // disable wlan
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// configure EXTI on A14
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EXTILine14_Config();
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// wait a little (ensure that WLAN takes effect)
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sys_tick_delay_ms(500); // force a 500ms delay! FIXME
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}
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uint8_t pyb_cc3000_spi_send(uint8_t val) {
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/*!< Loop while DR register in not emplty */
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
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/*!< Send byte through the SPI1 peripheral */
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SPI_I2S_SendData(SPI2, val);
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/*!< Wait to receive a byte */
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
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/*!< Return the byte read from the SPI bus */
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return SPI_I2S_ReceiveData(SPI2);
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}
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