diff options
| author | sago35 <[email protected]> | 2022-03-11 22:31:18 +0900 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2022-03-12 08:45:38 +0100 |
| commit | 96c60f9692e947537b707c474e477f0fd4b8c130 (patch) | |
| tree | 415e2fbe5834e18d9198784b6d2b103f031013c9 /src/machine/machine_atsamd51.go | |
| parent | 99ce46669b60f744a0661022e7a4fe3797d34243 (diff) | |
| download | tinygo-96c60f9692e947537b707c474e477f0fd4b8c130.tar.gz tinygo-96c60f9692e947537b707c474e477f0fd4b8c130.zip | |
atsamd51: allow faster frequency setting when using SPI
Diffstat (limited to 'src/machine/machine_atsamd51.go')
| -rw-r--r-- | src/machine/machine_atsamd51.go | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/machine/machine_atsamd51.go b/src/machine/machine_atsamd51.go index 3ba5ea5bc..65effd594 100644 --- a/src/machine/machine_atsamd51.go +++ b/src/machine/machine_atsamd51.go @@ -1033,6 +1033,9 @@ func (uart *UART) Configure(config UARTConfig) error { uart.Bus.CTRLA.Set((1 << sam.SERCOM_USART_INT_CTRLA_MODE_Pos) | (1 << sam.SERCOM_USART_INT_CTRLA_SAMPR_Pos)) // sample rate of 16x + // set clock + setSERCOMClockGenerator(uart.SERCOM, sam.GCLK_PCHCTRL_GEN_GCLK1) + // Set baud rate uart.SetBaudRate(config.BaudRate) @@ -1124,7 +1127,8 @@ type I2CConfig struct { const ( // SERCOM_FREQ_REF is always reference frequency on SAMD51 regardless of CPU speed. - SERCOM_FREQ_REF = 48000000 + SERCOM_FREQ_REF = 48000000 + SERCOM_FREQ_REF_GCLK0 = 120000000 // Default rise time in nanoseconds, based on 4.7K ohm pull up resistors riseTimeNanoseconds = 125 @@ -1178,6 +1182,9 @@ func (i2c *I2C) Configure(config I2CConfig) error { i2c.Bus.SYNCBUSY.HasBits(sam.SERCOM_I2CM_SYNCBUSY_SWRST) { } + // set clock + setSERCOMClockGenerator(i2c.SERCOM, sam.GCLK_PCHCTRL_GEN_GCLK1) + // Set i2c controller mode //SERCOM_I2CM_CTRLA_MODE( I2C_MASTER_OPERATION ) // sam.SERCOM_I2CM_CTRLA_MODE_I2C_MASTER = 5? @@ -1483,8 +1490,18 @@ func (spi SPI) Configure(config SPIConfig) error { spi.Bus.CTRLA.ClearBits(sam.SERCOM_SPIM_CTRLA_CPOL) } + // set clock + freqRef := uint32(0) + if config.Frequency > SERCOM_FREQ_REF/2 { + setSERCOMClockGenerator(spi.SERCOM, sam.GCLK_PCHCTRL_GEN_GCLK0) + freqRef = uint32(SERCOM_FREQ_REF_GCLK0) + } else { + setSERCOMClockGenerator(spi.SERCOM, sam.GCLK_PCHCTRL_GEN_GCLK1) + freqRef = uint32(SERCOM_FREQ_REF) + } + // Set synch speed for SPI - baudRate := SERCOM_FREQ_REF / (2 * config.Frequency) + baudRate := freqRef / (2 * config.Frequency) if baudRate > 0 { baudRate-- } |