DA14531 Smartbond Tiny™ Module

1个月前

This is not for debugging but (eventually) for comms. The device has another microprocessor on board which is connected to UART2. I'm just trying to understand the UART driver at the moment. The following code is a representative extract.

// Called during startup void start(void) { app_easy_timer(LED_TIMER_VAL, timer_cb); } // Just a test #define LONG_MSG "The cat sat on the mat dreaming of this and that little mouse related thing" static void timer_cb(void) { app_easy_timer(LED_TIMER_VAL, timer_cb); pic_uart_send(LONG_MSG); } void pic_uart_send(const char* message) { // Attempt to stall sleeping while the message is sent arch_force_active_mode(); uart_register_tx_cb(PIC_UART, pic_uart_send_cb); uart_send(PIC_UART, (uint8_t*)message, strlen(message), UART_OP_INTR); } static void pic_uart_send_cb(uint16_t length) { // Allow sleeping now that the message is done. // This does not work because the TX FIFO contains the last block // of the message when the callback is called. arch_restore_sleep_mode(); }

这就是我的腻子：

“猫坐在席子上梦想着这个，那个小鼠相关的猫坐在席子上梦想着这个，那小鼠标相关的猫坐在席子上梦想着这个，那个小鼠标相关的猫坐在席子上梦见这个和那个小鼠标相关的猫坐在席子上梦想着这个，这只小的老鼠与猫坐在席子上梦想着这个，那几点鼠标相关的魔杖。

我看着UART驱动程序ISR，因为它看起来像回调在邮件的最后一个块被推入FIFO后立即调用。我可以解决这个问题，但是想知道是否有更好的方法。

I also looked at arch_console.c - I note that the TX callback in that code uses the same method I have tried, but explicitly blocks while the FIFO is not empty. I guess that works, but I prefer my code to never block.

我正在使用SDK 6.0.14.1114。我可以建议以下修改的UART_TX_ISR（）吗？这允许在FIFO最终空之后发生一个发生的中断。只有这样它只会禁用中断并调用回调函数。我尝试过各种弦长度，在FIFO大小或附近，似乎做正确的事情。

static void uart_tx_isr(uart_t *uart_id) { uart_env_t *uart_env = UART_ENV(uart_id); // Condition to block callback until the FIFO is empty if (uart_env->tx_index < uart_env->tx_total_length) { // While there is available space, put data in thr_reg or FIFO while (uart_env->tx_index < uart_env->tx_total_length) { // If FIFO is enabled, exit if it is full if (uart_fifo_enabled_getf(uart_id)) { if(!uart_txfifo_not_full_getf(uart_id)) { return; } } // Else, exit if THR is full else if (!uart_thr_empty_getf(uart_id)) { return; } // Send one byte uart_thr_setf(uart_id, uart_env->tx_buffer[uart_env->tx_index++]); } return; } // Everything was sent // Disable TX interrupts uart_txdata_intr_setf(uart_id, UART_BIT_DIS); uart_thre_intr_setf(uart_id, UART_BIT_DIS); // Fire callback if (uart_env->tx_cb != NULL) { uart_env->tx_cb(uart_env->tx_total_length); } }

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