Configure UART0 (PB_2,PB_3) on mbed

Question

Hi, The mbed freezes when configuring the UART0 on PB_02/PB_03 (W7500). I’ve also tried to set the alternate function but does’t work. //configure alternate function HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_0, PAD_AF2); HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_1, PAD_AF2); HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_2, PAD_AF2); HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_3, PAD_AF2); //initialize serial on UART0 Serial serial(PB_2, PB_3); // tx, rx Any idea? Best regards

lawrence · Answer

Hello, joaopaulob I think you do not need to use HAL_PAD_AFConfig() Only you need to declare Serial Class : Serial serial(PB_2, PB_3); But if even you success the compile, it does not work. You must change D0(U0_RX), D1(U0_TX) alternative function to GPIO. Because the D0, D1 order is stronger then PB_2, PB_3 ( I think… ) Thank you, lawrence

lawrence · Answer

like this… Digital Output(D0); Digital Output(D1); Serial serial(PB_2, PB_3); Change the D0, D1 function and declare PB_2, PB_3 as UART0.

lawrence · Answer

hello, joaopaulob This is what I captured on my web compiler. 949×536 40.4 KB Could check your compiler with below lists? Did you select WIZwiki-W7500 as Web compiler Platform board? → refer the right side and up in that capture. Try to update mbed library. Thank you lawrence

lawrence · Answer

hello, joaopaulob Thank you so much! You are Right!.. It is my fault… I never thought about mbed library. WIZnet missed add PB_2 and PB_3 in Serial pin map. Refer below capture. 1226×911 115 KB So… Now you have two solutions. Change mbed to mbed-dev and Add PB_2 , PB_3 in PeripheralPins.c //*** SERIAL *** const PinMap PinMap_UART_TX[] = { {PA_13, UART_0, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {PC_2, UART_1, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {PB_2, UART_1, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {NC, NC, 0} }; const PinMap PinMap_UART_RX[] = { {PA_14, UART_0, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {PC_3, UART_1, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {PB_3, UART_1, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_PULLUP, Px_AFSR_AF0)}, {NC, NC, 0} }; Use another pin as UART0 , PC_2, PC_3. Thank you lawrence

joaopaulob · Answer

Found a way to “hack” the mbed: #include "mbed.h" #include "W7500x_uart.h" UART_InitTypeDef UART_InitStructure0; int main() { Serial rfid(PA_13, PA_14); DigitalOut dummy1(PA_13); DigitalOut dummy2(PA_14); // Reconfigure to PB2 and PB3 HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_2, PAD_AF2); HAL_PAD_AFConfig(PAD_PB,GPIO_Pin_3, PAD_AF2); UART_StructInit(&UART_InitStructure0); UART_InitStructure0.UART_BaudRate = 9600; UART_Init(UART0,&UART_InitStructure0); rfid.putc(0xAA); }