int app_com_at_baudrate_change_handler(ke_msg_id_t const msgid, void const *param,
ke_task_id_t const dest_id, ke_task_id_t const src_id)
{
uint32_t reg;
// QPRINTF("app_com_at_baudrate_change_handler:%d\r\n",baudrate);
reg = (uart_divider[baudrate].integer_h << (UART_POS_DIVIDER_INT + 8))
| (uart_divider[baudrate].integer_l << UART_POS_DIVIDER_INT)
| uart_divider[baudrate].fractional;
uart_uart_SetBaudDivider(QN_COM_UART, reg);
return (KE_MSG_CONSUMED);
}
/**
****************************************************************************************
* @brief Configurate UART baud rate.
* @param[in] UART QN_UART0 or QN_UART1
* @param[in] uartclk USARTx_CLK(div)
* @param[in] oversample UART_OVS16 or UART_OVS8
* @param[in] buadrate 115200
* @description
* an example of how to configurate baud rate:
* If the required baud rate is 230400, UARTCLK = 8MHz, and overs = 16, then:
* Baud Rate Divisor = (8¡Á1000000)/(16¡Á230400) = 2.170
* This means BRDI = 2 and BRDF = 0.170.
* Therefore, fractional part, m = integer((0.170¡Á64)+0.5) = 11
*****************************************************************************************
*/
static void uart_baudrate_set(QN_UART_TypeDef *UART, uint32_t uartclk, enum UART_OVERSAMPLE_TYPE oversample, uint32_t baudrate)
{
uint32_t inter_div;
uint32_t frac_div;
uint32_t overs;
uint32_t tmp;
overs = (oversample == UART_OVS16) ? 16 : 8;
tmp = (overs * baudrate);
inter_div = uartclk / tmp;
frac_div = uartclk - inter_div * tmp;
frac_div = (frac_div*64 + tmp / 2 ) / tmp;
// Set UART baudrate
tmp = (inter_div << UART_POS_DIVIDER_INT) + frac_div;
uart_uart_SetBaudDivider(UART, tmp);
}
/**
****************************************************************************************
* @brief Initialize the UART to default values.
* @param[in] UART QN_UART0 or QN_UART1
* @param[in] uartclk USARTx_CLK(div)
* @param[in] baudrate baud rate
* @description
* This function is used to initialize UART, it consists of baud-rate, parity, data-bits, stop-bits,
* over sample rate and bit order. The function is also used to enable specified UART interrupt, and
* enable NVIC UART IRQ.
*****************************************************************************************
*/
void uart_init(QN_UART_TypeDef *UART, uint32_t uartclk, enum UART_BAUDRATE baudrate)
{
// UART0 and UART1 are arranged in cross over configuration
uint32_t reg;
struct uart_env_tag *uart_env = &uart0_env;
uart_clock_on(UART);
// Set UART baudrate
#if UART_BAUDRATE_TABLE_EN==TRUE
reg = (uart_divider[baudrate].integer_h << (UART_POS_DIVIDER_INT + 8))
| (uart_divider[baudrate].integer_l << UART_POS_DIVIDER_INT)
| uart_divider[baudrate].fractional;
uart_uart_SetBaudDivider(UART, reg);
#else
uart_baudrate_set(UART, uartclk, UART_OVS16, baudrate);
#endif
#if CONFIG_ENABLE_DRIVER_UART0==TRUE
if (UART == QN_UART0) {
/*
* Set UART config:
*
* - oversample rate is 16
* - HW flow control disable
* - 1 stop bit
* - parity type unused
* - no parity
* - bitorder = LSB
*/
reg = UART_MASK_UART_EN // uart enable
| UART_MASK_UART_IE // uart int enable
//| UART_MASK_CTS_EN
//| UART_MASK_RTS_EN
| UART_OVS16
| UART_MASK_LEVEL_INV
| UART_MASK_BIT_ORDER;
uart_env = &uart0_env;
#if CONFIG_UART0_TX_ENABLE_INTERRUPT==TRUE && UART_TX_DMA_EN==FALSE
// Enable the UART0 TX Interrupt
NVIC_EnableIRQ(UART0_TX_IRQn);
#endif
#if CONFIG_UART0_RX_ENABLE_INTERRUPT==TRUE && UART_RX_DMA_EN==FALSE
// Enable the UART0 RX Interrupt
NVIC_EnableIRQ(UART0_RX_IRQn);
#endif
}
#endif
#if CONFIG_ENABLE_DRIVER_UART1==TRUE
if (UART == QN_UART1) {
/*
* Set UART config:
*
* - oversample rate is 16
* - HW flow control disable
* - 1 stop bit
* - parity type unused
* - no parity
* - bitorder = LSB
*/
reg = UART_MASK_UART_EN // uart enable
| UART_MASK_UART_IE // uart int enable
| UART_OVS16
| UART_MASK_LEVEL_INV
| UART_MASK_BIT_ORDER;
uart_env = &uart1_env;
#if CONFIG_UART1_TX_ENABLE_INTERRUPT==TRUE && UART_TX_DMA_EN==FALSE
// Enable the UART1 TX Interrupt
NVIC_EnableIRQ(UART1_TX_IRQn);
#endif
#if CONFIG_UART1_RX_ENABLE_INTERRUPT==TRUE && UART_RX_DMA_EN==FALSE
// Enable the UART1 RX Interrupt
NVIC_EnableIRQ(UART1_RX_IRQn);
#endif
}
#endif
// Set UART config
uart_uart_SetCR(UART, reg);
#if UART_DMA_EN==TRUE
dma_init();
#endif
//Configure UART environment
uart_env->rx.size = 0;
uart_env->tx.size = 0;
uart_env->rx.bufptr = NULL;
uart_env->tx.bufptr = NULL;
#if UART_CALLBACK_EN==TRUE
uart_env->rx.callback = NULL;
uart_env->tx.callback = NULL;
#endif
}
