embox

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/**
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 * @file
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 * @brief Implements BTM 112 Bluetooth driver.
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 *
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 * @date 15.07.11
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 * @author Anton Kozlov
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 */
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#include <stdint.h>
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#include <string.h>
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#include <hal/reg.h>
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#include <hal/system.h>
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#include <kernel/time/ktime.h>
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#include <drivers/at91sam7s256.h>
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#include <drivers/pins.h>
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#include <drivers/bluetooth/bluetooth.h>
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#include <drivers/bluetooth/btm/btm112.h>
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#include <kernel/time/timer.h>
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#include <embox/unit.h>
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extern void bt_handle(uint8_t *buff);
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#define BTM_BT_RX_PIN  ((uint32_t) (1 << OPTION_GET(NUMBER,rx_pin)))
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#define BTM_BT_TX_PIN  ((uint32_t) (1 << OPTION_GET(NUMBER,tx_pin)))
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#define BTM_BT_SCK_PIN ((uint32_t) (1 << OPTION_GET(NUMBER,sck_pin)))
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#define BTM_BT_RTS_PIN ((uint32_t) (1 << OPTION_GET(NUMBER,rts_pin)))
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#define BTM_BT_CTS_PIN ((uint32_t) (1 << OPTION_GET(NUMBER,cts_pin)))
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#define BTM_BT_RST_PIN   ((uint32_t) (1 << OPTION_GET(NUMBER,rst_pin)))
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#define BTM_BT_LINK_PIN  ((uint32_t) (1 << OPTION_GET(NUMBER,link_pin)))
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static volatile AT91PS_USART us_dev_regs = ((AT91PS_USART) OPTION_GET(NUMBER,serial_port_offset));
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#define BTM_BT_BAUD_RATE 19200
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EMBOX_UNIT_INIT(btm_bluetooth_init);
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#define BUFF_SIZE 27
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static uint8_t btm_bt_read_buff[BUFF_SIZE];
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static int btm_bt_read_len;
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static int nop_rx(int len, void *data) {
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	return 0;
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}
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static int nop(void) {
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	return 0;
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}
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CALLBACK_INIT_DEF(btm_bt_rx_handle_t, __bt_rx, nop_rx);
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CALLBACK_INIT_DEF(nxt_bt_state_handle_t, bt_state, nop);
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static irq_return_t btm_bt_us_handler(unsigned int irq_num, void *dev_id) {
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	CALLBACK(__bt_rx)(btm_bt_read_len, btm_bt_read_buff);
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	return IRQ_HANDLED;
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}
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static void init_usart(void) {
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	/* Configure the usart */
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	REG_STORE(AT91C_PMC_PCER, (1 << OPTION_GET(NUMBER,dev_id)));
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	REG_STORE(AT91C_PIOA_PDR, BTM_BT_RX_PIN | BTM_BT_TX_PIN |
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			BTM_BT_SCK_PIN | BTM_BT_RTS_PIN | BTM_BT_CTS_PIN);
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	REG_STORE(AT91C_PIOA_ASR, BTM_BT_RX_PIN | BTM_BT_TX_PIN |
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			BTM_BT_SCK_PIN | BTM_BT_RTS_PIN | BTM_BT_CTS_PIN);
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	REG_STORE(&(us_dev_regs->US_PTCR), (AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS));
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	REG_STORE(&(us_dev_regs->US_CR),  AT91C_US_RXDIS | AT91C_US_TXDIS);
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	REG_STORE(&(us_dev_regs->US_CR),  AT91C_US_RSTSTA | AT91C_US_RSTRX | AT91C_US_RSTTX);
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	REG_STORE(&(us_dev_regs->US_CR), AT91C_US_STTTO);
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	REG_STORE(&(us_dev_regs->US_MR), AT91C_US_USMODE_HWHSH
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			| AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE
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			| AT91C_US_NBSTOP_1_BIT);
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	REG_STORE(&(us_dev_regs->US_BRGR), SYS_CLOCK / (16 * BTM_BT_BAUD_RATE));
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	REG_STORE(&(us_dev_regs->US_IDR), ~0);
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	REG_STORE(&(us_dev_regs->US_RCR), 0);
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	REG_STORE(&(us_dev_regs->US_TCR), 0);
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	REG_STORE(&(us_dev_regs->US_RNPR), 0);
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	REG_STORE(&(us_dev_regs->US_TNPR), 0);
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	REG_LOAD(&(us_dev_regs->US_RHR));
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	REG_LOAD(&(us_dev_regs->US_CSR));
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	REG_STORE(&(us_dev_regs->US_CR), AT91C_US_RXEN | AT91C_US_TXEN);
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	REG_STORE(&(us_dev_regs->US_PTCR), AT91C_PDC_RXTEN | AT91C_PDC_TXTEN);
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	REG_STORE(&(us_dev_regs->US_IER), AT91C_US_ENDRX);
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}
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void bluetooth_hw_hard_reset(void) {
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	pin_config_output(BTM_BT_RST_PIN);
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	pin_set_output(BTM_BT_RST_PIN);
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	ksleep(1000);
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	pin_clear_output(BTM_BT_RST_PIN);
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	ksleep(5000);
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	pin_config_input(BTM_BT_LINK_PIN);
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	REG_STORE(AT91C_PIOA_PPUER, BTM_BT_LINK_PIN);
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	REG_STORE(AT91C_PIOA_MDDR, BTM_BT_LINK_PIN);
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}
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static int btm_bluetooth_init(void) {
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	irq_attach(OPTION_GET(NUMBER,irq_num), btm_bt_us_handler, 0, NULL, "bt reader");
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	// TODO error handling?
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	init_usart();
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	return 0;
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}
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size_t bluetooth_write(uint8_t *buff, size_t len) {
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	while (!(REG_LOAD(&(us_dev_regs->US_CSR)) & AT91C_US_ENDTX)) {
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	}
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	REG_STORE(&(us_dev_regs->US_TPR), (uint32_t) buff);
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	REG_STORE(&(us_dev_regs->US_TCR), len);
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	return len;
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}
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size_t bluetooth_read(size_t len) {
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	btm_bt_read_len = len;
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	REG_STORE(&(us_dev_regs->US_RPR), (uint32_t) btm_bt_read_buff);
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	REG_STORE(&(us_dev_regs->US_RCR), len);
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	return 0;
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}
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