mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-05 03:27:48 +00:00
machine/stm32: add STM32U5 SPI support
Add SPIv2 driver for STM32U5 using TXDR/RXDR and CFG1/CFG2 registers, which differ from the classic SPI peripheral on older STM32 families. Implements Configure() and single-byte Transfer(). Add SPI1 peripheral and pin definitions to arduino-uno-q board. Exclude stm32u5 from the shared classic SPI build tag.
This commit is contained in:
deadprogram
@@ -1,84 +1,97 @@
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package tmp
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//go:build arduino_uno_q
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} UART1.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART1.handleInterrupt)func init() {) I2C0 = I2C1 } AltFuncSelector: AF4_I2C1_2_3_4, Bus: stm32.I2C1, I2C1 = &I2C{ // I2C1 is documented, alias to I2C0 as well DefaultUART = UART1 } RxAltFuncSelector: AF7_USART1_2_3, TxAltFuncSelector: AF7_USART1_2_3, Bus: stm32.USART2, Buffer: NewRingBuffer(), _UART1 = UART{ UART1 = &_UART1 // debugger to be exposed as virtual COM port over USB. // USART2 is the hardware serial port connected to the onboard ST-LINKvar () I2C0_SDA_PIN = PB9 I2C0_SCL_PIN = PB8 // I2C pins UART_RX_PIN = PA3 UART_TX_PIN = PA2 // PA2 and PA3 are connected to the ST-Link Virtual Com Port (VCP) // UART pinsconst () BUTTON = PC13const () LED_GREEN = PA5 LED_BUILTIN = LED_GREEN LED = LED_BUILTINconst () D15 = PB8 D14 = PB9 D13 = PA5 D12 = PA6 D11 = PA7 D10 = PB0 D9 = PC7 D8 = PA9 D7 = PA8 D6 = PB10 D5 = PB4 D4 = PB5 D3 = PB3 D2 = PA10 D1 = PB6 D0 = PB7 A5 = PB12 A4 = PB11 A3 = PB1 A2 = PA4 A1 = PA1 A0 = PA0 // Arduino Pinsconst () "runtime/interrupt" "device/stm32"import (package machine// Arduino UNO Q board with STM32U585 processor.
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// Arduino UNO Q board with STM32U585 processor.
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package machine
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import (
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"device/stm32"
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"runtime/interrupt"
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)
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const (
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// Arduino Pins
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A0 = PA0
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A1 = PA1
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A2 = PA4
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A3 = PB1
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A4 = PB11
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A5 = PB12
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D0 = PB7
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D1 = PB6
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D2 = PA10
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D3 = PB3
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D4 = PB5
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D5 = PB4
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D6 = PB10
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D7 = PA8
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D8 = PA9
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D9 = PC7
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D10 = PB0
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D11 = PA7
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D12 = PA6
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D13 = PA5
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D14 = PB9
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D15 = PB8
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)
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const (
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LED = LED_BUILTIN
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LED_BUILTIN = LED_GREEN
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LED_GREEN = PA5
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)
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const (
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BUTTON = PC13
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)
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const (
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// UART pins
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// PA2 and PA3 are connected to the ST-Link Virtual Com Port (VCP)
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UART_TX_PIN = PA2
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UART_RX_PIN = PA3
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// I2C pins
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I2C0_SCL_PIN = PB8
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I2C0_SDA_PIN = PB9
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// SPI pins
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SPI1_SCK_PIN = PA5
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SPI1_SDI_PIN = PA6
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SPI1_SDO_PIN = PA7
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SPI0_SCK_PIN = SPI1_SCK_PIN
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SPI0_SDI_PIN = SPI1_SDI_PIN
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SPI0_SDO_PIN = SPI1_SDO_PIN
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)
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var (
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// USART2 is the hardware serial port connected to the onboard ST-LINK
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// debugger to be exposed as virtual COM port over USB.
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UART1 = &_UART1
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_UART1 = UART{
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Buffer: NewRingBuffer(),
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Bus: stm32.USART2,
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TxAltFuncSelector: AF7_USART1_2_3,
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RxAltFuncSelector: AF7_USART1_2_3,
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}
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DefaultUART = UART1
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// I2C1 is documented, alias to I2C0 as well
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I2C1 = &I2C{
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Bus: stm32.I2C1,
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AltFuncSelector: AF4_I2C1_2_3_4,
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}
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I2C0 = I2C1
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// SPI1 is documented, alias to SPI0 as well
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SPI1 = &SPI{
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Bus: stm32.SPI1,
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AltFuncSelector: AF5_SPI1_2_3_OCTOSPI1_OCTOSPI2,
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}
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SPI0 = SPI1
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)
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func init() {
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UART1.Interrupt = interrupt.New(stm32.IRQ_USART2, _UART1.handleInterrupt)
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}
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@@ -1,4 +1,4 @@
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//go:build stm32 && !stm32f7x2 && !stm32l5x2 && !stm32g0
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//go:build stm32 && !stm32f7x2 && !stm32l5x2 && !stm32g0 && !stm32u5
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package machine
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@@ -1,68 +1,123 @@
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package tmp
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//go:build stm32u585
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package machine
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import (
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"device/stm32"
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)
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func CPUFrequency() uint32 {
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return 160000000
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}
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// Internal use: configured speed of the APB1 and APB2 timers, this should be kept
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// in sync with any changes to runtime package which configures the oscillators
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// and clock frequencies
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const APB1_TIM_FREQ = 160e6 // 160MHz
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const APB2_TIM_FREQ = 160e6 // 160MHz
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//---------- UART related code
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// Configure the UART.
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func (uart *UART) configurePins(config UARTConfig) {
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if config.RX.getPort() == stm32.GPIOG || config.TX.getPort() == stm32.GPIOG {
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// Enable VDDIO2 power supply for PGx pins
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stm32.PWR.SetSVMCR_IO2SV(1)
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}
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// enable the alternate functions on the TX and RX pins
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config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
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config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
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}
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// UART baudrate calc based on the bus and clockspeed
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// NOTE: keep this in sync with the runtime/runtime_stm32u5.go clock init code
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func (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {
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return CPUFrequency() / baudRate
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}
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// Register names vary by ST processor, these are for STM U5
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func (uart *UART) setRegisters() {
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uart.rxReg = &uart.Bus.RDR
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uart.txReg = &uart.Bus.TDR
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uart.statusReg = &uart.Bus.ISR
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uart.txEmptyFlag = stm32.USART_ISR_TXE
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}
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//---------- SPI related types and code
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// SPI on the STM32U5 using the new SPIv2 peripheral
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type SPI struct {
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Bus *stm32.SPI_Type
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AltFuncSelector uint8
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}
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func (spi *SPI) config8Bits() {
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// U5 SPI has DSIZE field in CFG1, set to 7 for 8-bit frames (DSIZE = bits-1)
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spi.Bus.CFG1.ReplaceBits(7, 0x1f, 0) // DSIZE[4:0] = 0x7 = 8 bits
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}
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// Set baud rate for SPI
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func (spi *SPI) getBaudRate(config SPIConfig) uint32 {
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var conf uint32
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localFrequency := config.Frequency
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// Default
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if localFrequency == 0 {
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localFrequency = 4e6
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}
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// Set frequency dependent on PCLK prescaler
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// MBR field in CFG1 register, bits [30:28]
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switch {
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case localFrequency < 625000:
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conf = 7 // Div256
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case localFrequency < 1250000:
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conf = 6 // Div128
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case localFrequency < 2500000:
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conf = 5 // Div64
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case localFrequency < 5000000:
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conf = 4 // Div32
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case localFrequency < 10000000:
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conf = 3 // Div16
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case localFrequency < 20000000:
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conf = 2 // Div8
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case localFrequency < 40000000:
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conf = 1 // Div4
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case localFrequency < 80000000:
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conf = 0 // Div2
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default:
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conf = 7 // Div256 (safest)
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}
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return conf << 28 // MBR position in CFG1
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}
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// Configure SPI pins for input output and clock
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func (spi *SPI) configurePins(config SPIConfig) {
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config.SCK.ConfigureAltFunc(PinConfig{Mode: PinModeSPICLK}, spi.AltFuncSelector)
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config.SDO.ConfigureAltFunc(PinConfig{Mode: PinModeSPISDO}, spi.AltFuncSelector)
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config.SDI.ConfigureAltFunc(PinConfig{Mode: PinModeSPISDI}, spi.AltFuncSelector)
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}
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//---------- I2C related code
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} } return 0 default: return 0x00802172 case 500 * KHz: return 0x10802D9B case 400 * KHz: return 0x30A0A7FB case 100 * KHz: return 0xF010F3FE case 10 * KHz: switch br { // TODO: Do calculations based on PCLK1 // for 160MHz PCLK1. // These are 'magic' values calculated by STM32CubeMXfunc (i2c *I2C) getFreqRange(br uint32) uint32 {// Gets the value for TIMINGR register//---------- I2C related code} uart.txEmptyFlag = stm32.USART_ISR_TXE uart.statusReg = &uart.Bus.ISR uart.txReg = &uart.Bus.TDR uart.rxReg = &uart.Bus.RDRfunc (uart *UART) setRegisters() {// Register names vary by ST processor, these are for STM U5} return CPUFrequency() / baudRatefunc (uart *UART) getBaudRateDivisor(baudRate uint32) uint32 {// NOTE: keep this in sync with the runtime/runtime_stm32u5.go clock init code// UART baudrate calc based on the bus and clockspeed} config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector) config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector) // enable the alternate functions on the TX and RX pins } stm32.PWR.SetSVMCR_IO2SV(1) // Enable VDDIO2 power supply for PGx pins if config.RX.getPort() == stm32.GPIOG || config.TX.getPort() == stm32.GPIOG {func (uart *UART) configurePins(config UARTConfig) {// Configure the UART.//---------- UART related codeconst APB2_TIM_FREQ = 160e6 // 160MHzconst APB1_TIM_FREQ = 160e6 // 160MHz// and clock frequencies// in sync with any changes to runtime package which configures the oscillators// Internal use: configured speed of the APB1 and APB2 timers, this should be kept} return 160000000func CPUFrequency() uint32 {) "device/stm32"import (package machine
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// Gets the value for TIMINGR register
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func (i2c *I2C) getFreqRange(br uint32) uint32 {
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// These are 'magic' values calculated by STM32CubeMX
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// for 160MHz PCLK1.
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// TODO: Do calculations based on PCLK1
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switch br {
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case 10 * KHz:
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return 0xF010F3FE
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case 100 * KHz:
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return 0x30A0A7FB
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case 400 * KHz:
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return 0x10802D9B
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case 500 * KHz:
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return 0x00802172
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default:
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return 0
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}
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}
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@@ -0,0 +1,119 @@
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//go:build stm32u5
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package machine
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// SPI on STM32U5 uses the new SPIv2 peripheral with separate TXDR/RXDR registers.
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import (
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"unsafe"
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)
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// SPIConfig is used to store config info for SPI.
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type SPIConfig struct {
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Frequency uint32
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SCK Pin
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SDO Pin
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SDI Pin
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LSBFirst bool
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Mode uint8
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}
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// Configure is intended to setup the STM32U5 SPI peripheral.
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func (spi *SPI) Configure(config SPIConfig) error {
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// Disable SPI interface before any configuration changes
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spi.Bus.CR1.ClearBits(1) // Clear SPE (bit 0)
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// Enable clock for SPI
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enableAltFuncClock(unsafe.Pointer(spi.Bus))
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// Init pins - use defaults if not specified
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if config.SCK == 0 && config.SDO == 0 && config.SDI == 0 {
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config.SCK = SPI0_SCK_PIN
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config.SDO = SPI0_SDO_PIN
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config.SDI = SPI0_SDI_PIN
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}
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spi.configurePins(config)
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// Configure CFG1: baud rate and data size
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var cfg1 uint32
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// Set baud rate (MBR bits [30:28])
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cfg1 |= spi.getBaudRate(config)
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// Set data size to 8 bits (DSIZE[4:0] = 7 = 8-1)
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cfg1 |= 7
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spi.Bus.CFG1.Set(cfg1)
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// Configure CFG2: master mode, SS output, polarity, phase
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var cfg2 uint32
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const (
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cfg2_MASTER = 1 << 22 // MASTER bit
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cfg2_SSM = 1 << 26 // Software SS management
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cfg2_SSOE = 1 << 29 // SS output enable
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cfg2_AFCNTR = 1 << 31 // Alternate function GPIO control always active
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cfg2_CPOL = 1 << 25
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cfg2_CPHA = 1 << 24
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cfg2_LSBFRST = 1 << 23
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)
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cfg2 |= cfg2_MASTER | cfg2_SSM | cfg2_AFCNTR
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// Set polarity and phase
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switch config.Mode {
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case Mode1:
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cfg2 |= cfg2_CPHA
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case Mode2:
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cfg2 |= cfg2_CPOL
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case Mode3:
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cfg2 |= cfg2_CPOL | cfg2_CPHA
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}
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// Set bit transfer order
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if config.LSBFirst {
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cfg2 |= cfg2_LSBFRST
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}
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spi.Bus.CFG2.Set(cfg2)
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// Enable SPI
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spi.Bus.CR1.SetBits(1) // Set SPE (bit 0)
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return nil
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}
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// Transfer writes/reads a single byte using the SPI interface.
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func (spi *SPI) Transfer(w byte) (byte, error) {
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// Set transfer size to 1 frame
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spi.Bus.CR2.Set(1)
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// Start the transfer
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spi.Bus.CR1.SetBits(1 << 9) // CSTART bit
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// Wait until TX FIFO is ready (TXP bit in SR)
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const sr_TXP = 1 << 1
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const sr_RXP = 1 << 0
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const sr_EOT = 1 << 3
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for !spi.Bus.SR.HasBits(sr_TXP) {
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}
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// Write byte to TXDR
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spi.Bus.TXDR.Set(uint32(w))
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// Wait for RX data available (RXP bit in SR)
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for !spi.Bus.SR.HasBits(sr_RXP) {
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}
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// Read received byte
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data := byte(spi.Bus.RXDR.Get())
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// Wait for end of transfer
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for !spi.Bus.SR.HasBits(sr_EOT) {
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}
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// Clear EOT flag
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spi.Bus.IFCR.Set(sr_EOT)
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return data, nil
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}
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