UART driver: Fix crash in ISR due to "UART" static array moved to flash
Ref: http://esp32.com/viewtopic.php?f=13&t=546&sid=76ff371ae2b259441a2cf355e96d74b9#p2275 This is a really subtle bug, gcc noticed the UART array elements are read-only so implicitly moved the elements to .rodata as if it was const. However this array is accessed from the UART ISR, so has to be in IRAM or DRAM.
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@ -84,7 +84,8 @@ typedef struct {
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static uart_obj_t *p_uart_obj[UART_NUM_MAX] = {0};
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static uart_dev_t* UART[UART_NUM_MAX] = {&UART0, &UART1, &UART2};
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/* DRAM_ATTR is required to avoid UART array placed in flash, due to accessed from ISR */
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static DRAM_ATTR uart_dev_t* const UART[UART_NUM_MAX] = {&UART0, &UART1, &UART2};
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static portMUX_TYPE uart_spinlock[UART_NUM_MAX] = {portMUX_INITIALIZER_UNLOCKED, portMUX_INITIALIZER_UNLOCKED, portMUX_INITIALIZER_UNLOCKED};
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esp_err_t uart_set_word_length(uart_port_t uart_num, uart_word_length_t data_bit)
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