PSOC™ 4000T有两路SCB即Serial Communication Block，可以被配置为SPI、I2C和UART。
这是一个全功能的UART，运行速度高达1mbps。此外，它还支持9位多处理器模式,允许通过普通RX和TX线路连接的外设寻址。该模块支持常见的UART功能，如奇偶校验、中断检测和帧错误。
从数据手册看到，P2.2，P2.3可以分别用于uart.rx与uart.tx。
硬件实物：
打开Modus IDE，点击New Application开始创建新的工程。
选择器件型号：
选择外设UART：
点击Device Configurator，进入图形化外设配置界面。
配置SCB 0为UART模式。TX P2.3， RX P2.2， 115200等参数。
实物照片：
核心代码：int main(void)
{
cy_rslt_t result;
uint32_t read_data;
cy_en_scb_uart_status_t initstatus;
/* Turn off the USER LED */
Cy_GPIO_Write(CYBSP_LED1_PORT, CYBSP_LED1_NUM, LED_OFF);
/* Initialize the device and board peripherals */
result = cybsp_init() ;
/* Board init failed. Stop program execution */
if (result != CY_RSLT_SUCCESS)
{
CY_ASSERT(0);
}
/* Initialize the UART */
initstatus = Cy_SCB_UART_Init(CYBSP_UART_HW, &CYBSP_UART_config, &CYBSP_UART_context);
/* Initialization failed. Handle error */
if(initstatus!=CY_SCB_UART_SUCCESS)
{
handle_error();
}
/* Enable global interrupts */
__enable_irq();
Cy_SCB_UART_Enable(CYBSP_UART_HW);
/* Transmit Header to the Terminal */
Cy_SCB_UART_PutString(CYBSP_UART_HW, "\x1b[2J\x1b[;H");
Cy_SCB_UART_PutString(CYBSP_UART_HW, "***********************************************************\r\n");
Cy_SCB_UART_PutString(CYBSP_UART_HW, "PSoC 4 MCU UART transmit and receive\r\n");
Cy_SCB_UART_PutString(CYBSP_UART_HW, "***********************************************************\r\n\n");
Cy_SCB_UART_PutString(CYBSP_UART_HW, ">> Start typing to see the echo on the screen \r\n\n");
for (;;)
{
/* Check if there is a received character from user console */
if (0UL != Cy_SCB_UART_GetNumInRxFifo(CYBSP_UART_HW))
{
/* Re-transmit whatever the user types on the console */
read_data = Cy_SCB_UART_Get(CYBSP_UART_HW);
while (0UL == Cy_SCB_UART_Put(CYBSP_UART_HW,read_data))
{
}
}
}
}
编译后，烧录：Started by GNU MCU Eclipse
Open On-Chip Debugger 0.12.0+dev-5.7.0.3672 (2025-03-04-03:08)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
********************************************************************************
* !!! OBSOLETE target 'psoc4.cfg' - will be removed soon. *
* Use 'infineon/psoc4.cfg' target instead. *
********************************************************************************
Info : auto-selecting first available session transport "swd". To override use 'transport select <transport>'.
** Auto-acquire enabled, use "set PSOC4_USE_ACQUIRE 0" to disable
adapter speed: 2000 kHz
Info : Using CMSIS-DAPv2 interface with VID:PID=0x04b4:0xf155, serial=0D04189E02272400
Info : CMSIS-DAP: SWD supported
Info : CMSIS-DAP: Atomic commands supported
Info : CMSIS-DAP: FW Version = 2.0.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : KitProg3: FW version: 2.70.1480
Info : KitProg3: Pipelined transfers enabled
Info : KitProg3: Asynchronous USB transfers enabled
Info : VTarget = 3.317 V
Info : kitprog3: acquiring device in Test Mode using 'PSOC 4' target and 'xres' reset...
Info : clock speed 2000 kHz
Info : SWD DPIDR 0x0bc11477
Info : [psoc4.cpu] Cortex-M0+ r0p1 processor detected
Info : [psoc4.cpu] target has 4 breakpoints, 2 watchpoints
*****************************************
** Silicon: 0x3612, Family: 0xC6, Rev.: 0x22 (B1)
** Detected Family: PSoC 4000T
** Detected Device: CY8C4046LQI-T452
** Detected Main Flash size, kb: 64
** Chip Protection: OPEN
*****************************************
Info : [psoc4.mem_ap] Examination succeed
Info : [psoc4.cpu] Examination succeed
Info : gdb port disabled
Info : starting gdb server for psoc4.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : SWD DPIDR 0x0bc11477
Info : kitprog3: acquiring device in Test Mode using 'PSOC 4' target and 'xres' reset...
[psoc4.cpu] halted due to debug-request, current mode: Thread
xPSR: 0xa1000000 pc: 0x10000040 msp: 0x20001fe8
** Device acquired successfully
Started by GNU MCU Eclipse
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : accepting 'gdb' connection on tcp/3333
Info : New GDB Connection: 1, Target psoc4.cpu, state: halted
Warn : Prefer GDB command "target extended-remote :3333" instead of "target remote :3333"
Info : SWD DPIDR 0x0bc11477
Error: Failed to read memory at 0x10000040
semihosting is enabled
Warn : No RTOS could be auto-detected!
Warn : No RTOS could be auto-detected!
Verifying region (0x00000000, 4712)... Mismatch
Info : Data mismatch, proceeding with flash programming
Info : Padding image section 0 at 0x00001268 with 24 bytes (bank write end alignment)
Warn : Only mass erase available, erase skipped! (psoc4 mass_erase)
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Info : SWD DPIDR 0x0bc11477
Info : kitprog3: acquiring device in Test Mode using 'PSOC 4' target and 'xres' reset...
[psoc4.cpu] halted due to debug-request, current mode: Thread
xPSR: 0xa1000000 pc: 0x10000040 msp: 0x20001fe8, semihosting
** Device acquired successfully
Info : SWD DPIDR 0x0bc11477
Info : kitprog3: acquiring device in Test Mode using 'PSOC 4' target and 'xres' reset...
[psoc4.cpu] halted due to debug-request, current mode: Thread
xPSR: 0xa1000000 pc: 0x10000040 msp: 0x20001fe8, semihosting
** Device acquired successfully
Info : psoc4.cpu: bkpt @0x00000359, issuing SYSRESETREQ
[psoc4.cpu] halted due to debug-request, current mode: Thread
xPSR: 0x61000000 pc: 0x00000358 msp: 0x20002000, semihosting
===== arm v7m registers
(0) r0 (/32): 0x40100004
(1) r1 (/32): 0x00000359
(2) r2 (/32): 0x00000000
(3) r3 (/32): 0x00000000
(4) r4 (/32): 0x20002000
(5) r5 (/32): 0x08000000
(6) r6 (/32): 0x0ffff060
(7) r7 (/32): 0x00000000
(8) r8 (/32): 0x200007e4
(9) r9 (/32): 0x40290000
(10) r10 (/32): 0x1fff2000
(11) r11 (/32): 0x00000000
(12) r12 (/32): 0x00400200
(13) sp (/32): 0x20002000
(14) lr (/32): 0x1000012d
(15) pc (/32): 0x00000358
(16) xpsr (/32): 0x61000000
(17) msp (/32): 0x20002000
(18) psp (/32): 0x40100110
(20) primask (/1): 0x00
(21) basepri (/8): 0x00
(22) faultmask (/1): 0x00
(23) control (/3): 0x00
===== Cortex-M DWT registers
Warn : keep_alive() was not invoked in the 1000 ms timelimit. GDB alive packet not sent! (2733 ms). Workaround: increase "set remotetimeout" in GDB
Warn : keep_alive() was not invoked in the 1000 ms timelimit. GDB alive packet not sent! (1418 ms). Workaround: increase "set remotetimeout" in GDB
Error: [psoc4.cpu] not halted (gdb fileio)
Polling target psoc4.cpu failed, trying to reexamine
Info : SWD DPIDR 0x0bc11477
Info : [psoc4.cpu] Cortex-M0+ r0p1 processor detected
Info : [psoc4.cpu] target has 4 breakpoints, 2 watchpoints
Info : [psoc4.cpu] Examination succeed
Info : [psoc4.cpu] external reset detected
Polling target psoc4.cpu failed, trying to reexamine
Info : SWD DPIDR 0x0bc11477
Info : [psoc4.cpu] Cortex-M0+ r0p1 processor detected
Info : [psoc4.cpu] target has 4 breakpoints, 2 watchpoints
Info : [psoc4.cpu] Examination succeed
Info : [psoc4.cpu] external reset detected
Polling target psoc4.cpu failed, trying to reexamine
Info : SWD DPIDR 0x0bc11477
Info : [psoc4.cpu] Cortex-M0+ r0p1 processor detected
Info : [psoc4.cpu] target has 4 breakpoints, 2 watchpoints
Info : [psoc4.cpu] Examination succeed
Info : [psoc4.cpu] external reset detected
Polling target psoc4.cpu failed, trying to reexamine
Info : SWD DPIDR 0x0bc11477
Info : [psoc4.cpu] Cortex-M0+ r0p1 processor detected
Info : [psoc4.cpu] target has 4 breakpoints, 2 watchpoints
Info : [psoc4.cpu] Examination succeed
Info : [psoc4.cpu] external reset detected
打开串口助手，可以看到欢迎界面。在串口输入：“hello 21ic”，可以看到相同的内容被打印到屏幕上。
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